How to calculate race car spring rate. HTTP/1.1 200 OK Date: Sat, 15 Jan 2022 03:36:06 GMT Server: Apache/2.4.6 (CentOS) PHP/5.4.16 X-Powered-By: PHP/5.4.16 Connection: close Transfer-Encoding: chunked Content-Type: text/html; charset=UTF-8 207b 279. 5 s, the car is moving uphill at 4. Another definition would be: The amount of force it takes to compress the spring 1-inch and is expressed in ld/in. real-world spring rate tests. Spring sag is the amount the springs compress between fully topped out and fully loaded with the rider on board in riding position. Because spring rates are the same, each spring will collapse the same amount under the weight of the vehicle. Just change the view (Y on the xb1 controller) to find it. In an instance when an application cannot be covered by the Eibach Roll Center Calculator Plus v3. 5 Hz. That’s almost dead on with a Chevy 492 casting, which has a cross-sectional area of 1. The outside diameter of the recommended valve spring may require that the spring pocket of the head be machined to a bigger size. 758 square inches. Spring rates are determined by the amount the spring deflects versus the weight placed upon it. B. 500 Lbs SP70500. Tested with and intended for Forza Horizon 5. 0 m/s2 8. … It has a pair of 9N/mm forks springs, so to get the same spring rate at the rear axle as the front, the shock spring needs to be twice as stiff because there is only one shock but two fork springs. Posted on March 20, 2017. vehicle control but bigger vehicle comfort. Spring motion ratio = d1 Spring / d2. 4 program is our top of the line Suspension Program and works with Wheel Rate with more precise 3D (X, Y and Z coordinates) inputs so you can design your suspension to perform the Enter the corner weight (which you can calculate using the Weight Distribution Calculator), the unsprung weight (which is total weight of components not support by the spring) and your existing or intended coil rate using a mixture of US or metric measurements. A. The roll center is an imaginary point around which the rear of the race car rolls. If a spring's rate is linear (most racing springs have linear rates) its rate is not affected by the load put onto the spring. Drag Racing Front Spring Tech. (I say close because as you compress a coil spring the coils begin to close up and the rate per inch will increase slightly) If you scale your car, your right front spring will have a static load. The calculation can also be done in Imperial units: In the Imperial system mass is measured in slugs where 1 slug = 32. 6 work with and can calculate Spring Rate of the front and REAR of vehicles. Then, slide the spring over the shock until it comes in contact with the spring retainer, also called the preload nut. Typically, a family sedan will have a spring frequency of around 1hz, a sports car around 1. The most common example is in a vehicle's suspension, where it is used to describe the displacement and forces in the springs and shock absorbers. 4 program is our top of the line Suspension Program and works with Spring Rate with more precise 3D (X, Y and Z coordinates) inputs so you can design your suspension to perform the How to measure spring rate. Measure and record how many inches of threads are showing above the upper spring collar. 16. ) in Inches : 1/4 Mile ET: 1/4 Mile Top End Speed: Ideal 1/4 Mile Gear Ratio: Each car has a different amount of available TC steps, but usually the number varies from around 8 to 12. Use our web-based version below or download our Springulator® app. When the spring stops deflecting, it has a store of force equivalent to the spring rate and the deflection: with an 18 N/mm spring, and a deflection of 25 mm, the energy is 18 x 25 = 450 N. heaver spring for spring rates 400 lb. BC 5kg Taper Spring 62. heavier lower spring in the 100 to 300 lb. % % % % % % % Figure"1:Solidaxlesuspensionwithtrackwidth"(t)andspringspacing(s) " Introduction. The stacked spring concept is being used on the left rear, right front and sometimes on the right rear to It is easiest just to measure this using a ruler, calipers or dial indicators, and a some kind of jack you can precisely control (like a street car sissor jack). Lower spring rates are also lighter and results in less spring and shocks friction as well as lower component load. C: Spring A must stretch half the distance spring B stretches. After installing the lower spring and the upper spring, there should be zero preload. X 400#/in. Solution: Now let’s put the values in the first formula to get the answer. … distance from the spring seat on the cylinder head to the outside spring land on the bottom of the valve spring retainer (this is the space the valve spring occupies). /in. Wheel Travel - 1inch = 25. Optimum grip requirements will change with each race car, tyre and road surface. 2 Hz higher. Changing spring rate affects ride height and the rate at which weight is transferred to the rear tires. The science behind designing a progressive rate coil is knowing over what suspension travel and to what degree the spring rate will increase. It is easier to achieve handling and performance with a lower spring rate and a “stiff” stabilizer bar or shock. At 30mm of sag, the total spring force is 32. The height of the rear roll center (and the front also) is critical to handling. Video: How to Use RideTech’s Online Calculator Tool to Pick the Best Spring Rates for Your Car or Truck Pendragon CEO Bill Berman: car supplies could take eight years to recover Williams joins Trident for 2022 F2 season This leverage reduces the spring rate and sway bar rate felt at the contact patch, which we call the wheel rate. Convert lbs/inch kg/mm Convert lbs/inch N/mm Convert kg/mm lbs/inch Convert kg/mm N/mm Convert N/mm lbs/inch Convert N/mm … __ __ __ lb/in R initial spring Rate in pounds per inch Answer 1 x R Answer 2 Multiply Answer 1 by R __ __. (The energy required to stretch a spring is proportional to k and to x2. 3 Nm/degree Rear roll rate (Kφr) = 67800Nm/radian = 1183 Nm/degree Figuring Out The Spring Rate In order to figure out spring rates, the first thing you should do is to determine the exact corner weights of your car while at race weight (including the driver weight, fuel, oil, etc. This calculator assumes coilovers, so if your springs and shocks are not coaxial (Mustangs) you're SOL for the moment. The chart shows the ‘thinking distance’ and the ‘braking distance’ needed to stop the car. Find the damping constant that would produce critical damping. 8 and 3. 2 kg for the mass. A bluefin tuna's formula would look like this: s = 286 m i l e s 6. Some special applications may require different pressures. It is the single biggest factor to consider when setting up your car. Our main spring for this will be 250 lb/in and the bump spring is 1250 lb/in. 6 work with and can calculate Wheel Rate of the front and REAR of vehicles. 5kg Spring Rate: The force per unit of displacement of the spring or shock itself Wheel Center Rate: The force per unit of vertical displacement of the wheel center ich separates the body of the car and the driver The purpose of this system is to keep … Set these first and work with other values around them. For the "Number of Leaves" column, enter the number of leaves that match the width, length and thickness entered. Video: How to Use RideTech’s Online Calculator Tool to Pick the Best Spring Rates for Your Car or Truck Pendragon CEO Bill Berman: car supplies could take eight years to recover Williams joins Trident for 2022 F2 season Jerry Bickel has decades of experience building race cars and adds to the concept of the correct spring rate for ride height. The principle is simple. 2-0. steady state cornering ie without longitudinal acceleration. DO NOT compensate for having too much sag by tightening the preload on the spring. Inserting this product into the above equation for the resonant frequency gives, which may be a familiar sight from reference books. Coil-Over Spring Rates. 0Hz front and 1. October 28, 2021. Enter the value you want to convert Conversion results After you have entered in a value please select a conversion. 5 Coil-overs. After 2. Watch the video, then click HERE to use the Spring Rate Calculator tool. The softer the spring, the smoother the ride. Now, as an exaggeration, you are down to 250's in the front of the coil over car and 400's in the front of the big spring car. 20ff 5 m/s 2. "Sprung" weight is a term used to describe the parts of a car that are supported by the front and rear springs. by Martin Krönke. Others require the spring to be removed from the engine. The max ride height for Rally is around an inch more than Race suspension. Next month, single wheel bump springs and ride damping will be explained; eventually over the series, spring rates and damping in … The car has been pushing so you keep dropping front spring rate. 200. The banking doesn't really affect how we calculate the G-forces on the driver, but without the banking the cars could never go around such a tight turn at 230 mph. There are many “marketing” rumors about Dual Rate Spring (DRS) systems for the UTV market. We are trading roll rate from the front springs and moving that work to the sway bar. Spring Rates vs Sprung Mass and Ride Frequency Now, you can create baseline spring rates for your car in ride motion. 1 1/8" x 26" bars solid and hollow effective length 23". The firmer valving is used to help keep the car flat and stable while using much heavier springs. Generally, stiffer Springs make your car respond quicker and reduce chassis roll, but will not work well on bumpy tracks. The natural frequency is the speed at which the spring can respond to changes in load: The natural frequency defines the oscillating behavior of the suspension. The last number on this spring we have not talked about yet is the portion printed at the end and barely visible in … This is important in planning out how we should spring our cars. Let’s say there are 10 gaps. " 0s 36 m/s!!"7. Vehicle Weight (in pounds) Vehicle Horsepower: RPM through lights (finish line) Tire Diameter (Hght. Typical racing scales will calculate this for you automatically, but you can rig up something that will work using a single scale and 3 equal sized spacers to get a good estimate. (Leverage ratio curve for the geeks). The original formula is from Fred Puhn's book on handling called "How to make your car handle". Some cars, such as the Ferrari 488 GT3 and the Porsche 911 GT3 R (and their Evo/911II variants respectively) have a 2-stage system (TC1 and TC2) in which these variables can be adjusted independently of each other. Spring Rate is half the difference between the loads 1 inch above and 1 inch below a specified position. Introduction. If you’re still having trouble, think of it as a fat guy on a mattress. Tested on the fastest stock suspension cars in the world, Calvert’s Split Mono Leafsprings are designed to control Acceleration Calculator Belt Length Calculator BMEP Calculator (Brake Mean Effective Pressure Calculator) Carburetor CFM Calculator Car Center of Mass Calculator Car Crash Calculator Car Jump Distance Calculator Conservation of Momentum Calculator Density Calculator Displacement Calculator Elastic Potential Energy Calculator Factor of Safety Calculator Force … Calculator Use. Calculate your own based on corner weights and spring rates: Weights and coil rate. with the real cost of a second car buying scenario…” For more All standard steel springs are black and are marked with their spring rate in lbs/in (in 50 lb increments) and the total travel of the spring itself. Video: How to Use RideTech’s Online Calculator Tool to Pick the Best Spring Rates for Your Car or Truck Pendragon CEO Bill Berman: car supplies could take eight years to recover Williams joins Trident for 2022 F2 season Track car- Front wheel frequency range of 2. Record the length like so: “24 inches x 24 inches” or maybe “21 inches by 27 inches,” depending on your measurements and center bolt location. Let’s say it is . Achieving the recommended installed height is imperative if the springs are to exert the pressures they were designed to deliver and proper-ly control the valves. 5 cm) (without moving the car), the How to Calculate Acceleration: Step-by-Step Breakdown Now we’ll breakdown the acceleration formula step-by-step using a real example. As a racer or crew chief, you can use these formulas to map the existing brake setup on your own race car, and then make calculated decisions when the desired handling or driver feel isn’t being delivered. spring that is installed at 0° straight up and down (90° from the axle centerline) will support That’s why we’re awfully fond of the folks at RideTech for developing an online spring rate calculator. Calculate the total stopping distance of the car. Anti-Roll Bars. If another Simply put, valve spring pressure is how much pressure is on the valve at a specific measurement. This gives us Wheel Rates of: Front WR = (SF in cpm/187. This is because the energy input into the contact patch will be taken more by the suspension spring, and less by the tyre. BG55. spring and compress it 3 inches it will have a load close to 900 lbs. This can be used for comparison of different diameter bars. Use springs that will keep the car under control under acceleration and braking. The Subaru BRZ has a rear multi-link From the Skip Barber, we progress into a faster and more complex car: the Formula Renault 2. 125”. CAR COST COMPARISON CALCULATOR – D. Mustang Performance Handbook, William R. 005V E-22 . When in doubt, please contact your camshaft supplier. The calculator will show you the total sales tax amount, as well as the county, city, and special district tax rates in the selected location. 5kg. 3 Given Multiple Speeds for Different Amounts of Time. This was at the same spring rate. The firm spring rate would be used for an autocross/road racing application or for a streetcar that say, has a 300lbs. The Truth About Dual Rate Springs . the springs has to be dissipated in some form, dampers dampens the oscillations and stabilizes the system. _____ Stopping distance = _____ m (1) (b) The graph shows how the braking distance of a … The motion ratio of a mechanism is the ratio of the displacement of the point of interest to that of another point. 3) Multiply these numbers together and this is how far the spring can compress before it coilbinds: Example: . According to Fernando Gutierrez of Atlas Spring, “Most coil springs have a linear spring rate. Use sway bars to make the car corner nearly level, and balance handling - IE oversteer - understeer. The result is the same amount of ride height. Furthermore, the aerodynamics of a Formula 1 car are highly dependent on ride Divisional Length. The spring lengths are pre-determined for each application and we offer these rear kits with soft, medium, and firm spring rates. Now we take the 150 and add it to our installed pressure of 100, which gives us 250. Consider the example above, where the spring rate was calculated to be 500 lbs/inch (87. Springs with three spring rates are also optional for the front and rear axles. and If we have a camshaft providing a total valve lift of . How to Weigh Your Race Car. What was the car's average acc Academia. Road racing front-wheel-drive cars need the added help with rotation for cornering, so the front wheels can be pointed straighter for putting the power down sooner and better. If you already have springs, and want to make adjustments to your rates, see our article How to calculate new preload and springs by using existing springs. Looking for a … Car Corner Weight, Wedge and Cross Weight Calculator. Suspension Coil Spring Rate Equations Calculator Automobile Car Truck Design Formulas. ) Follow the curve of the spring, measuring from the center of the front eye back to the center bolt. To use, measure the width, length and thickness of each leaf in the spring pack, and enter the measurements into the converter. Excessive open spring pressure results in stresses placed on the pushrods and in turn, valve bounce. The formula for acceleration can be used, recognizing that the final result must have a negative sign. The one-man operation has grown to a small business of 10 employees. Racing cars can have a damping ratio approaching 1. Dave at Team Z has done a lot of testing in the last two years and also says the 12" is a more controlled spring in these cars. 1 Given One Distance and One Time Period. Table 1. Your new kg value should be 10. A 50% Cross Weight will yield a balanced handling car, one that turns equally well in both directions. 20de Height Race car suspension Class. Give as smooth of a ride aas possible while going down the track. + 400#/in. Video: How to Use RideTech’s Online Calculator Tool to Pick the Best Spring Rates for Your Car or Truck Pendragon CEO Bill Berman: car supplies could take eight years to recover Williams joins Trident for 2022 F2 season Suspension calculator solving for spring rate constant given torsional or rigidity modulus, Math Geometry Physics Force Fluid Mechanics Finance Loan Calculator. 175 Lbs SP70175. Valve spring coil bind takes place Progressive rate springs are the ultimate in spring design. This is to give you a guideline of what spring rate you need, there are other variables that may require you to need a softer or firmer spring rate. The lower the rate, the softer the spring. Let's see how the banking helps. Suspension is the term given to the system of springs, dampers and linkages that connect the body of a vehicle to it’s wheels. 0 km/h in a distance of 120 m (a fairly typical distance for a non-panic stop). This works best with cars racing on shorter, tighter and/or flatter tracks where making the car turn-in crisply is difficult. The springs are mounted to a solid perch on one end and a shackle that pivots on the other end. The only goal of a race car is maintaining the Advanced Racing Suspensions. All shock spring series use the same rate code. 99 £29. A Spring’s Spring Rate. We calculate the spring motion ratio by dividing the distance from the inner pivot to the spring mount (d1 spring) by the distance from the inner pivot to the center of the tire contact patch (d2). In competitions, the goal of the mousetrap car is to achieve as much forward motion as possible, on a flat surface and/or on an inclined surface. Commonly, springs are mounted on control arms, swing arms or some other pivoting suspension member. Standard black springs should only be paired with shocks having less travel than the travel marked on the spring itself. Instant Center Lenth: 52. Spring Calculator - TF Tuned are experts in mountain bike and bicycle suspension service and repair, including setting-up the for you and your bike A big sway bar is utilized to resist roll and it adds spring rate as the car enters the turn. If you have a spring series "21041" and need a 95N rate, you'll order a 21041-31. The actual value depends upon ride/handling compromise adopted to the particular car. Set tire pressures first. 8)² (491) = 313. So, convert Newtons to kg by dividing by 9. Our FAQ section will continue to grow as we receive questions daily. Shock stroke - 1inch = 25. A race car accelerates from 15 m/s to 35 m/s in 3 seconds. When you plug key measurements into RideTech’s handy spring calculator, it’ll do the math for you and help you determine the best spring rates for your suspension setup. Video: How to Use RideTech’s Online Calculator Tool to Pick the Best Spring Rates for Your Car or Truck Pendragon CEO Bill Berman: car supplies could take eight years to recover Williams joins Trident for 2022 F2 season The spring has to maintain that force at a rate of nearly 100 times a second, without losing any load or failing run after run. For compression, use the chassis spring and tyre spring rate combined, the combined damper and tyre damping, and the mass of the unsprung system. 400 - 425 lb/in. How do we know if we have the correct spring rates; To begin with we need to understand tha the spring in a drag car has only two functions. 300 Lbs SP70300. Suppose a race car is traveling in a circular path or track, and it travels 1 lap or $$2\pi$$ radians in 4 minutes. Using the sprung mass you may calculate the natural frequency for the spring under that load. 31%. Softer rear springs allow the weight to transfer to the rear, consequently reducing oversteer. G. As the number of active coils increases, the spring rate decreases. The strict manufacturing tolerances developed by Hyperco yield a spring tolerance of two percent (maximum) for every drag racing spring produced. Assumption made in calculation. Explore this Article. The length of the arm is the distance from center of torsion bar to center of rod end. A fat guy on a soft mattress would sink in pretty far, but a fat guy on a hard concrete-like mattress wouldn’t Spring rate Lb/in: Spring Rate kg/mm: < < Number of Active coils : That’s why we’re awfully fond of the folks at RideTech for developing an online spring rate calculator. 4. 250 Lbs SP70250. Then work out your preferred upgrade from Whiteline, Eibach and H&R, Uprated anti-roll bars are one of the most effective ways of improving not only the handling of a car, but Mousetrap Car. properly set up. 5 N/mm), if one were to move the wheel 1 in (2. Tested on the fastest stock suspension cars in the world, Calvert’s Split Mono Leafsprings are designed to control For example, a 200/200 combination will act as 100 primary / 200 secondary. The springs are tall and constructed from small-diameter, high-tensile chrome silicon wire, … Rate calculator copyright 2010 Length of bar (in) Bar out sidediameter (in) Bar inside diameter (in) Note: use 0 if solid bar Length of arm (in) lbs if rate is not updated : click update button below Home : more calculators Stacking Springs for 2. 1). One Load, Two Load, Rate Based & Dimension Compression Spring Calculations ; The Springulator® features four different types of compression spring calculators, which check spring stress and provide spring design information. (a) A car driver makes an emergency stop. Anti-Lock Brakes A racecar driver is cruising at a constant velocity of 20 m/s. I made a mistake while editing the equation for calculating the surface area of a circle which is πR2. This force will result in a moment, whose arm is the unsprung CG height, . 50 mm/min design density and then find the flow rate from the sprinkler given the sprinklers minimum pressure requirement, whichever is the greater flow … How to Calculate Average Speed. Andrew … DRAG PERFORMANCE CALCULATOR. Developed specifically for Round track racing. 190. 6 and Circle Track Analyzer v3. These are quite heavy assemblies. The first is the spring rate of the spring, the second is the motion ratio of the spring and the third is the spring spacing. Wether your wanting to soft that Right Front to get you car up on it or stiffen the left rear to drive a little harder out of the corner, Pit Stop USA has a great selection of coil-over springs, leaf springs and race cars. It is the rate at which an object slows down. 5”. kgs. 6"|Page". After watching the video, if you still need help using the Spring Rate Calculator, please feel free to give us a call. But the trend is to run softer springs, and reset the shock to maintain the pressure on the tyre. Follow the same steps for setting the sag for the front fork. Click Here to Start Using the RideTech Spring Rate Calculator. 4 Given Two Speeds for Half the Time. Spring rate and anti roll bar adjustments are common as we tune our race car. Video: How to Use RideTech’s Online Calculator Tool to Pick the Best Spring Rates for Your Car or Truck Pendragon CEO Bill Berman: car supplies could take eight years to recover Williams joins Trident for 2022 F2 season Wallace Racing BACK to Calculators Use this calculator to get a general idea of what the new spring pressures might be when using a boosted application. However, the 5. H = 0,1 m Being a factor in the divident of the fraction, this value has a huge influence on the solution of this equation. Solid Axle Rear Springs. How is it calculated? Spring rates are listed by the manufacturer. 5Hz (150 cpm) up front and 2. Many vehicles that the coilovers are designed for have separate shock and springs in the rear due to OEM designs. 0 m/s when the driver gets the engine started. Find the unit rate or unit price with this calculator. Flat Track Motorcycle. 200 Lbs SP70200. Spring rates affect how the car reacts to both vertical and lateral loads, while anti roll bars affect how the car reacts to lateral cornering forces. Front Lower Control Arm Bolt Height: Rear Car Weight: Front Car Weight: Center of Gravity Height (or Camshaft Height): Wheelbase: Tire Diameter: The Baseline Suspensions calculator has plotted YOUR geometry below. 21ca Excellent distillation of the concepts into brief summaries and easy to use Calculate the tarpon's average speed like this: s = 105 m i l e s 3 h o u r s, which means the fish can travel at an average speed of 35 m p h. £34. Ride heights control the center of gravity height of the car which is huge in dirt track chassis performance. Advanced Race Car Suspension Development, Steve Smith, from Steve Smith Autosports. edu is a platform for academics to share research papers. Roll rate is defined as torque resisting body roll per degree of body roll. It is also referred to as static ride height or static sag. 7″ Springs. The wheel rate, or the spring rate “at the wheels”, can be calculated using a car’s motion ratio to allow for a better understanding of what the spring is actually doing. But harder spring rates will press the tyre into the road harder. PONTIAC POWER RULES ! ! ! Calculate Valve Spring Pressure at New Lift. When collapsed to ride height, it would exert 1000 pounds. Most average streetcars will use the medium spring rate, while most drag cars will use the soft spring rate. … FH5 Master Copy Weight Distribution,DRIFT/RACE - English Unit,RALLY SPRINGS - English Units,DRIFT/RACE - Metric Unit,RALLY - Metric Unit Front,Spring Rate,Spring Rate The spring mass M can be found by weighing the spring. 8 m/s (100 km/h, 91. Fig. 2. IRS Rear Springs. 1 ft/s, 62. COST of buying and owning a car, but it will also help you to. The spring range for Rally suspension is 1. A rate is a ratio comparing quantities of different items. But I say that I would recommend a 12" spring. = 600 = 133. In other words, the goal is to maximize the distance traveled on both these surfaces. If the valve setup has more than one spring, each spring will need to be input to find the pressure on each one. The size of the valve also plays a part. The calculator can be used for a sway bar or a torsion bar to find the rate at the mounting end of the arm. The FR 2. 2 kg) times the acceleration (2. Designed to be extremely light weight, and linear all the way through the stroke. Shocks affect the motion of the corners of the car and therefore the placement of wheel loads during transitional periods, and dirt cars are almost always in transition. CGH is determined by many factors, one of which is spring rate. 5 h o u r s , so the fish has an average speed of 44 m p h . The spring rate of the bar is added to the existing left rear and right rear spring rates of the car, making the rear roll couple percentage stiffer during cornering. Speed (or rate, r) is a scalar quantity front wheel drive set-up racing technology. 1 – 2. So, the angular velocity of the race car is pi / 2 radians per minute 005 = spring rate in kg per mm; BC 8KG Taper Spring 117. That’s why we’re awfully fond of the folks at RideTech for developing an online spring rate calculator. Let’s pretend it’s 500 lbs. D2 = The distance from the pivot point of the a-arm to the center of the ball joint. Our Suspension Analyzer v2. Spring rate is very closely tied to horsepower, traction, car weight, and center of gravity height. A spring’s Spring Rate is the amount of weight required to deflect a spring one inch. 600 - 650 lb/in. spindle choice and dimensions, kingpin and steering inclination, wheel offset, frame height, car track Eibach Race Springs are all manufactured in series production, often repeated, with a strong manufacturing experience. Then calculate the angular velocity of the car. 0 is usually right, with the rear being 0. These settings work together to alter the weight transfer and roll properties of the car in order to on another effect of increasing the tyre spring rate versus the suspension wheel rate, if it is a race car, you would find the tyres take longer to reach operating temp (if everything else compound wise was equal). Ladder bar/four link angle, spring rate and shock tweaking can pay off in a faster and more consistent race car FRPS - Fork Pressure Springs and Top-Out Springs FRSP - Fork Springs FTNK - TNK Fork Tubes FZ - Marzocchi Fork Parts HMOR - O- Rings HMWC - Copper Sealing Washers SH - Valving Shims S_BL - Shock Reservoir Bladders SKSH - Shock Seal Heads SMBO - Bottom-Out Bumpers SKDS - Shock Shaft Seals Wheel rate is usually equal to or considerably less than the spring rate. They suspend the vehicle's frame, body, engine, driver, all liquids and the power train above the wheels. A video tutorial on setting up the spring preload on a divorced rear coilover that have a separate spring and shock in the rear. 3 Hz (138 cpm) out back. 8 kg. Delivery in 6 to 16 Working Days (UPS lead times are currently slower than usual, please expect potential delays) Add to Cart. They also help the rear end rotate the car more quickly. 50hz on a 50% car. 125” x … The Rear Roll Center is easy to calculate. Springs come in many different Spring rates (or pound ratings) that are usually designated by their color. Fox SLS springs come in 25lb increments to give you more adjustability. ERO is a comprehensive system of springs and accessories using the same ERS dual spring philosophy. Calculate the force exerted on the car and compare it with the force found in part (a). By. For 23” bars use 18. BRAKE MATH: CALCULATING THE FORCE NEEDED TO STOP A CAR. Definitions: Spring Rate is half the difference between the loads 1 inch above and 1 inch below a specified position. In a typical Sprint Car, the front to rear percent of total weight is 35-40 … If you want to measure the pressure of your existing springs, use a Valve Spring Tester. For the first 1. 15 Jan 04 08:22. For more information on spring rates see Spring Rate Calculator and Spring Re-Calculation Guide. Landrum designed their front drag racing coil springs to ”store” energy for instant, maximum weight transfer for launching. It works out as follows; . Physics. I have changed several cars over to a 12" spring and they all were more stable to the 330'. For this reason we feel it is important to understand how the system works and why. The car will roll through the suspension travel … Each coil is then tested for spring rate and the rate is stamped directly on the spring. Alternatively, to induce understeer or … Enter the value you want to convert Conversion results After you have entered in a value please select a conversion. After zooming in and out and panning the drawing you may want to quickly return to a full view of the model. Because of Generally Recommended Valve Spring Pressures Please note, the valve spring pressure figures given here are guidelines only. 5 m/s 2). The only goal of a race car is maintaining the Video: How to Use RideTech’s Online Calculator Tool to Pick the Best Spring Rates for Your Car or Truck Pendragon CEO Bill Berman: car supplies could take eight years to recover Williams joins Trident for 2022 F2 season The angle that the coilover assembly is installed at has a large effect on what the spring rate will need to be. Spring Rate Calculator lbs in mph lbs/in Overall: A car's natural frequency (in Hz) is the number of times a car will bounce up and down each second. This energy than pushes the wheel downwards, and if there were no damping the car would continue to oscillate up and down on its springs for a long time. The moment can be divided by the axle track to yield a lateral load transfer component: Where is the unsprung weight on the track being analysed. If the spring rates are different, the lighter and often shorter spring always goes on top. Static ride height is one of the key setup adjustments, and also one of the easiest to get right. 2) Count how many coil spring “gaps” there are. If you are on the fringe of the spring rate range, don’t be afraid to select the firmer rate. I then set the car down and measured the coils to be 26. 5kg to create a 30mm sag figure. * Car is more responsive * Use in high grip conditions to avoid traction rolling Height The height of the panhard barhelps to determine the height of the rear roll center(see illus. (450 lbs/in) Corner Weight. If you are unhappy with your pre-existing springs, don’t settle. Mathis. The Spring Rate controls the transfer of weight of the car. 85. They calculate rate based on the Spring Pressure at Installed Height and Open Height. The force in the spring is (roughly) the vertical force at the contact patch divided by the motion ratio, and the spring … That’s why we’re awfully fond of the folks at RideTech for developing an online spring rate calculator. 2071 The best solution can be hard to find. 008V C-41 . While running the same spring top and bottom will still give you a transition, we recommend (if possible) a 50 lb. Download Article. Screw the upper adjuster nut down while gently rattling the springs, when they stop rattling that is Zero Preload. A swtich from soft tyres for Qualifying to a harder compound for the race may just need other spring rate values - most other characteristics of the car may not vary. These equations are for recreation only. ) Then, measure from the center of the other eye back to the center bolt. The greater the angle of the spring, the stiffer it will need to be to support the weight of the car. 5 for better road holding characteristics. (Good job; you have realized an important fact. 1 mph) in 10 s. Yes, that’s what sends composite springs to the dumpster; a rock in just the right place. In fact, an 8 kg/mm spring on the front suspension of a Subaru BRZ will work differently than it would on the rear suspension. I currently have 16” 450 lb over 16” 600 lb springs on the rear for a combined rate of 257 lbs. Coil Spring Rate Calculator. Rear WR = (138/187. Press on the orange bar to expand it then enter the suspension leverage value yourself or by pressing Help! which … Formula 3: Desired total roll rate H, the vertical distance from the roll center axis to the CG I don't have and had to guess. Softer front springs aid in shifting the weight to the front, thereby reducing understeer. In NASCAR Racing, all of this is done for you and the roll couple is determined by adjusting the front and rear springs and sway bars. Peterson VERY EXTENSIVE. C. If you have a rate, such as price per some number of items, and the quantity in the denominator is not 1, you can calculate unit rate or price per unit by completing the division operation: numerator divided by This speed calculator is a tool that helps you determine the average speed of a moving object based on the distance traveled over a certain time traveled. When using stacked springs on a Dirt Late Model, this allows the car to run on a very soft spring rate on entry of the turn, until the heavier rate is needed through the middle and exit off the turn. 1 1/8" x 29" bars hollow tubular effective length 23". Schroeder Torsion Bar Spring Rate Charts. The steel spring is like ballast in a racecar, right where it needs to be; low and behind the rear axle. In case of a race car, the latter is o course insigni cant. The "unsprung" weight includes wheels and tires, brake assemblies, the rear NOTE: These springs are designed for DRAG RACING and have a higher spring rate / stiffer ride than stock springs. 0 s. The formula is a general attempt to compute the spring rate of the sway bar. This calculator will determine your spring rate. The combination of a 200#/inch and 400#/inch spring works the same as a single 133#/inch spring, as long as both combination springs are active. 80,000 200#/in. If you do not know the mass of the spring, you can calculate it by multiplying the density of the spring material times the volume of the spring. 739 0. 76 square inches. To the driver this is a very frustrating feeling, quite often on a front wheel drive car the rear inside wheel will now be airborne, and the car just understeers relentlessly. 42 to 3. These settings work together to alter the weight transfer and roll properties of the car in order to A Winston Cup Car on a super-speedway will be running a dynamic ride height so low that the frame can bounce off the track, sparking as it rolls along at, for example, a buck eighty-five at Charlotte. 6655 has an advanced … closed and one end open. Advanced Racing Suspensions was founded in 1991 after owner, Corey Fillip, recognized the need for the improvement of racing suspensions. New Anti-Roll Bar Stiffness Calculator so you can compare different bar sizes to your original bars, and also compare different adjustments on the bar. Spring Rates . For example, for many cars converting a qualifying setup into a race setup (or vice versa) only means adjusting fuel and the static ride height. Designed to have the optimal spring rate sweet spot where the spring is used on actual vehicle. 547% on top Sway Away Shocks, Fox Shocks and King Shocks as well as quality suspension and fabrication components are our specialty. 5 Given Two Speeds for Half the Distance. Measurements must be entered in decimal form. XXX lbs/in ÷ 56 = ( spring rate in KG/mm. 5: Ride Heights basics. __ __ T spring Travel to achieve desired ride height (from chart) Answer 2 ÷ T BASELINE SPRING RATE Divide Answer 2 by T ( F - L ) R = T Baseline Spring Rate Spring rates and preload will determine the range of stroke that the bike uses. Spring halves are painted black, but some raw steel may show due to deburring/grinding sharp edges when assembling. “You need a spring rate that will hold the shock at the designed distance apart for the weight of your car. 2 and optimum handling occur for a damping ratio for example even equal 0,8. Corner Weight Calculator This is used to calculate the corner weight and Wedge. So simple. See Fred's book for more information on how the Ride rate is defined as vertical force per unit vertical displacement of the tire ground contact with respect to chasis. 2 Given Multiple Distances in Different Amounts of Time. 739:1 16 12 cos( ) cos( ) ( ) u ( ) u u D D A C B C A B L L d d SR MR Equation"13% Wheelrate Springrate Springrate Wheelrate MR Springrate A Sp u u u u. The AntiSquat value is 111. A 315 lb spring will stay 315 lbs until it breaks. After the ten seconds, it is seen moving at a rate of 10 m/s to the left. A mousetrap car uses the stored energy of a mousetrap spring to generate forward motion. 739 . 76". My company, Race Tech, 951. Choosing the right springs for your race car is key to achieving the best performance and smooth handling. Deceleration is the final velocity minus the initial velocity, with a negative sign in the result because the velocity is dropping. Wheel Rate Effective Wheel Rate = Spring Rate * (Motion Ratio) 2 Where: L = Half the overall length of the longest leaf spring (m) F = Force applied at each mounting point to the chassis (usually half the load applied at the axle point) (m) b = Leaf spring width at the centre point (m) t = Vertical depth of the leaf spring at the centre point where it … Editor's note- Springs are one of the most important (and noticeable) parts of a car's suspension to consider when preparing it for track use. 0 has more setup options available, including an important one, which will vary greatly between circuits: the selection of front and rear springs. The roll rates without taking the spring rate of the tyres into account are much simpler: This calculator is a great learning tool to show the effect of arm length, bar length and bar size changes to Sway bars or Torsion bars. Excessive stiffness can cause a reduction of mechanical grip. If the coilover is dual rate, install the slider first before mounting the lower spring from the lower end of the shock. ) D: Spring A requires more energy than spring B. Any combination of spring rate and preload that gives 32. Keep in mind, that changing the spring rate will effect the ride height. none Spring Rate Calculator Step 1 – Determine Sprung Weight. You will need to weight your vehicle on each tire to use this tool. Rear Roll Center may be easy to understand but in the end we just move it to adjust the car and then move it back if the driver complains. Support the weight of the car up to the starting line. When the bars or front springs are changed to different rates, it will have a factor on CGH. …. Pro Stock cars use camshafts with lift in excess of 1-inch. Front roll rate (Kφf) = 94900 Nm/radian = 1656. Soft rates allow the chassis to ride deeper into the suspension travel and therefore into the stiffer part of the stroke. March 20, 2017. 48-inch stroke running at 6,000 rpm calculates as follows: Area = (4. ). We are constantly getting questions on how to properly setup the spring p Find the magnitude of force acting upon a cart weighing 100 N and accelerating at the rate of 2. 2054 A 350-ci engine with a 4-inch bore and a 3. Disclaimer: This may not be an accurate result, best to see what the cam or valve spring company recommends. Lighter valves require lower spring pressures, which reduces the risk of pushrod flexing. Using a spring with 1000-pound rate, the spring’s free length would be 1” longer than ride height. This will calculate the pressure of a spring at a lift inputed. Lastly With proper springs, your car or truck will ride and handle much better. COM Forza Tuning Calculator *Note: In FM7, torque is no longer listed in the Upgrades interface, but it can be found in the "My Garage" and "Select Car" interfaces. The valve spring pressure measurements you will see are what it has for seat pressure and open pressure. This system serves a dual purpose: optimizing the vehicle’s handling, and keeping the occupants comfortable. 17405 … A very soft spring would need more compression rate and less rebound rate, whereas a stiffer spring would need more rebound rate and much less compression rate. Back to Calculators Index. 119. 500 x 300 = 150. Rear Roll Center is the average of the inner and outer mounting point heights at the center of the left and right mounting locations. ) and decreases it when you don't. 5 m/s. The lower the Spring Rate, the softer the spring. The rear bar helps to free up the car at entry. methods. When in doubt, choose a lower spring rate. Here are some points to remember when weighing your race car: Make sure the floor is perfectly level; use shims under the scale pads if needed. 1) With the car at ride height measure the distance between the coils. These numbers are just averages and are very dependent on the class of car and the tires being run. Tennessee has a 7% statewide sales tax rate , but also has 234 local tax jurisdictions (including cities, towns, counties, and special districts) that collect an average local sales tax of 2. For our example we are going to split the roll rate roughly 58/42 between our front and rear wheels giving the below values for our first iteration. Hydraulic Flat Tappet Camshaft: 110 lbs Seat pressure/250-280 lbs open pressure between the upper and lower spring mounts to hold up the vehicle, there are any number of ways to achieve that. Here's how to determine the ideal range of spring rates for your car. 33#/in. You should always find the closest spring rate available for your application. Unsprung weight. For help with undertanding how all of the different parts work and/or help with tunings/fine-tuning, please check out the BG55. 002 x 3. 3. A unit rate is a rate with 1 in the denominator. Divide D1 by D2 to calculate the force ratio (Fr). 1 1/8" x 30" bars hollow tubular effective length 23". The spring range for Race/Drift in Horizon is 2. by Steve Edwards Sway Bar Rate Calculator When the car corners, lateral acceleration is applied at this CG, generating a centrifugal force. C. Harold Unikel of Power Brake X-Change, of Pittsburgh, PA reminded my why it is so important for technicians to be able to understand the brake math basics. These are not new springs and they have been on the car for a while. Velocity (v) is a vector quantity that measures displacement (or change in position, Δs) over the change in time (Δt), represented by the equation v = Δs/Δt. 00 m. range. 18hz on a 50% car. ----- For a standard spring rate (lbs / in) to metric spring rate (kg/mm) use the formula. Use an accurate racecar scale that will weigh each corner of your car. The graph shown below gives the acceleration of the race car as it starts to speed up. 275 - 325 lb/in. 7. A simple hydraulic press machine is required with a gauge to read psi or kg/cm^2 or whatever unit. If you are using a coil shock, changing the spring rate to get a specific sag means changing the physical spring. This is a "magic number", in that it cannot be derived. In a standard, single spring application (picture 1) there is one spring per shock. The first to be examined will be a simple straight axle with springs of equal value and springs in a vertical orientation. Although speed and velocity are often words used interchangeably, in physics, they are distinct concepts. A coilover with a 10” 225 lb. Only springs developed specifically for flat track motorcycles. Choosing spring rates in the most effective ballpark rates for your application and desired use can be tough, but the following is a good way to spend a little time calculating what might be the best "optimal" choice for you. An IRL or CART car on a big oval will be running a dynamic ride height of less than X` with spring rates in the 2,500-5,000 lbs. Visit the App Store for your iPhone or iPad … If we take a 300 lb. Home - ThumperTalk That’s why we’re awfully fond of the folks at RideTech for developing an online spring rate calculator. If a Champ Car tried to make a flat turn at 230 mph, it would slide right off the track because it doesn't have enough traction. 8)² (449) = 242. Depending on road conditions the optimum ride may occur for damping ratio around 0. 5 to 55 and somewhere between 75 and 125 pounds of wedge. Some true and some not. Off-Road racing was one branch of Motorsport which required special attention to spring lengths, inner diameters and rates that were not commonly found on road race vehicles. Eventually the car will “fall over” onto the outside front wheel. The trend in dirt racing seems to be leaning toward a left side weight percentage of around 53. But your car, for a wide variety of reasons, may have quite different requirements. A “stiff” spring will have a higher spring rate. A number of years ago, famed race car designer David Bruns explained to this writer that “springs put the power down, anti roll bars tend to lift the inside wheel. Figuring out roll couple is a complex formula that includes roll rate, track width, spring rate, sway bar lengths and thickness, anti roll lever lengths and rates, and tire pressures. Find the final velocity of the driver when she reaches the Calculating average velocity or speed. Dual rate nuts high on the body, spring slider not touching nuts. 1 1/8" x 30" bars solid and hollow effective length 24". Somewhere betwen 1. Just after a comfirmation and any correction if need be on the terms to use in the calculation of compression and rebound damping ratio. Less "bounce" than the 14" springs. Convert lbs/inch kg/mm Convert lbs/inch N/mm Convert kg/mm lbs/inch Convert kg/mm N/mm Convert N/mm lbs/inch Convert N/mm … Coilovers ordered from us with springs & AccuTune valving receive a highly accurate spring rate calculation including 5 point performance check. The required spring pressure is based on the camshaft and lifters. You could also use a 200-pound spring that was 5” longer than ride height. Damping coefficient value for a passenger car is around 0. MM3 Race Series Spring … Basic Spring Calculator. What is Spring Rate? Great question! Damien and Steve help you figure out what the best option is for you! Give the video a watch and let us know what you th k = Spring Rate (Spring Constant) na = Active Coils; v = Poison's Ratio of Material What spring rate do I need on my car? is a common question. See page 84 for suggested spring rates for the Mustang 5. Then it needs to be 2 x 2 times as stiff to allow for the 2:1 linkage ratio, so a total of 8 times stiffer, or 72N/mm. For the teams and cars, the 24-hour race at the Nürburgring is the ultimate feat of strength, for the drivers it is the greatest possible test of courage, for the fans an absolute highlight, and for BMW a … Deceleration is the opposite of acceleration. Normally a machine to measure spring rate is not available, hence TiTAN Suspension founders have found a brilliant way to acquire useful figures / number related to spring rate. Part of what goes into this is what the spring’s rate is per inch and the installed height. For rebound use only the chassis spring, only For dual rate coilovers you will need to multiply the spring rate calculated above by two to get the required spring rates. 2159 Many people refer to spring rate as “stiffness”. 5” of travel in … (a) Calculate the force needed to bring a 950-kg car to rest from a speed of 90. I have heard of many cars running well outside of these parameters and winning. Front Springs. When designing a (front) suspension , geometry layout is critical. 2 Ride Height Low A car with mass 1000 kg (2205 lbm) accelerates from 0 m/s (0 ft/s) to 27. Given the motion ratio, the wheel rate is determined by multiplying the spring rate by the square of the motion ratio: WheelRate = SpringRate * MotionRatio^2. The spring rates hugely affect mechanical grip, but also aerodynamics, which may surprise you. I'm confident the damper units are the same--try the same springs and dampers on a car with rally, then race suspension. range and a 100 lb. As she nears the finish line, the race car driver starts to accelerate. 0. Whether you are test driving your brand new car, or just going for a quick jog or cycle, if you want to know how to find average speed, this calculator will come in handy. Possibly a third function is to support the additional weight during weight transfer. Based on our real-world comparisons, we have found that the formula seems to be slightly softer than what the real rate of … One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. w = θ / t w = 2pi / 4 = pi / 2. COM … Primary Spring Rate X Secondary Spring Rate Primary Spring Rate + Secondary Spring Rate = Working Spring Rate Example: 200#/in. . This calculator takes your car's four wheel weights and calculates current weights and percentages and generates target wheel weights to achieve a 50% Cross Weight or Wedge. A typical family car is set up to exhibit a natural frequency somewhere between 5 and 10. Spring Calculator - The Spring Store The store will not work correctly in the case when cookies are disabled. When the axle hits an obstacle, the leaf spring compresses getting flatter and longer, the shackle allows the spring to move without binding. The tires' limits of grip will now have been breached, no more weight transfer can occur. For example, a linear rate spring rated at 500#/inch will compress 1" when a 500# weight is placed onto the spring. It is specifically designed for the three-piece NASCAR type sway bar, or torsion bars used in sprint Forza Horizon 5 Tuning Calculator (ALPHA) Created by Basement & Garage (justLou72/MarcusLM72) Additional Assistance and Testing by the Up 2 Speed Custons (U2SC) Community. As a general guideline, lighter springs allow the car to easily transfer weight, and settle faster down track. Equal time spent on the chassis can often yield even greater results. Typical GT or Boss 302 with 450 lb/in springs. What is its average acceleration? a!!! " " v t! 15 m/s 3. In order to understand the complexity of a Formula Cars suspension, a basic knowledge of the stock car suspension should first be mastered. 1 1/8" x 26" bars hollow tubular effective length 20". The only time spring length can affect suspension preload is if there aren’t enough threads on the shock to get the desired preload, or if the springs will go to coil bind. Multiply your new mass value (10. 5” from static ride height, and we’ll just keep the 1:1 motion ratio going between the wheel and the spring. Shock, Spring & Torque Testers. Intercomp has the tools to help you test and rate your shocks, springs, full coil-over set-ups, pull bars, and more! Spring/Tire Testers. 8)² (SW), which gives us (150/187. Thus, Eibach constantly achieves the most linear spring characteristic (rate) while maintaining the lowest tolerances and the highest quality in the industry. 5hz, and a race car around 2hz. To prevent this, the cars have to have super stiff springs, so that downforce doesn’t cause the car to bottom out. 500 then we can calculate the pressure by multiplying the lift by the spring rate and adding that number to the installed pressure to determine the open pressure. I measured the spring at full droop with the Pre-Load ring only hand tight if that at 32”. Force Ratio (Fr) = D1/D2. 3, however off road car need higher damping of around 0. So, the heavier the car, the stiffer the spring you will need to hold that shock in its designed position. Remember, 10 N is equal to 9. 8Hz rear Suspension Frequency yields spring rates that we feel are a bit too high or low, we’ll adjust SF to coincide with our years of experience choosing and testing spring rates … It is expressed in pounds per inch (lbs. 01 to 4. This means that each fork spring must push up 32. 985 0. 0 degree camber change with ride no tire lateral distortion. During braking and acceleration the weight of the car shifts forward and backward. We’ve set our bump stop gap to be 1. The spring rate increases when you need it (cornering, load carrying etc. Some can measure the spring while it is installed. This will keep Car needs more Straightline drive but is good everywhere else * * * * Raise the pull bar on both ends ( Note: when moving pull bar up or down on rearend housing , you are Affecting the rate of the pull bar spring . Select your spring rate by using the following calculations: D1 = The distance from the pivot point of the a-arm to the mounting point of the spring/shock. Shock speed above which you want the curve to digress. although i run a rwd car i've had a far bit of involvement in making fwd cars handle so here goes, you dont say what sort of car and suspension set up you have so i'm guessing a bit when it comes to rear spring rates but these settings took 7 seconds a lap of my mates fwd escort on the silverstone stowe circuit (sub 50 … The spring is a real spring with a spring c A spring with a mass of 3 kg has damping constant 28 and spring constant 123. Use only the valve springs that will give the correct spring pressure with the valve both on the seat and at maximum lift. This Coil Spring Rate Calculator. Advertisement. There are a few styles available. (b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2. Higher up on rearend will use softer 1. A car is coasting backwards downhill at a speed of 3. The zoom extents button centers the model and zooms it to the point you can see the entire model within the calculator. In the article below, you can find a lot of … The first step is to calculate the minimum flow which will be required at the most remote sprinkler which in this case is at node [130], this is a two-step process as will need to calculate the minimum flow required to satisfy the 7. of stereo in the … That’s why we’re awfully fond of the folks at RideTech for developing an online spring rate calculator. Roll Center Calculator Plus v3. 542 Obtain your spring calculations with our Free online spring calculator Design 3 different types of springs including compression, extension, and torsion. If uphill is chosen as the NOTE: These springs are designed for DRAG RACING and have a higher spring rate / stiffer ride than stock springs. 48 x 6,000) ÷ 190,000 = 1. The other reasons are greater damper travel and higher shock velocities and wheel displacement are quite small on a FSAE car, Higher Motion Ratio produces better shock performance. ” Therefore if wheel spin is a problem with low powered cars, increase rear spring rate, and reduce swaybar stiffness at the rear. more accurately compare the real cost of one car buying scenario. So for a 8 kg/mm spring you would have a 448lb spring, and a 500lb spring is equal to a 8. Racers have a fascination with their engines; numerous test sessions are spent dialing in carburetor jetting, timing curves and shift points. 10th March 2005. Torque is essential to the function of the calculator (differential, toe and gearbox). Composite springs don’t lose their spring rate over time. Assume the race car had a velocity of 20 m/s at time t=0 s. A drag race car should run the lightest front spring rate possible, without letting the shocks bottom out when making a pass. A trucking Step 2 – Calculating … Now with Motion Ratio, Mass, and Frequency in hand, we can insert that all into our formula below to provide us with the corresponding spring rate: K= (4π²F²M)/mr² f = Natural frequency (Hz) K = Spring rate (N/m) M = Mass (kg) mr = Motion Ratio (Spring:Wheel) Spring Rate = Static Load / Shock Ride Height. 6f0 At some point you will want to enter your own suspension geometry data or even just just view the current model in It will calculate the spring rate for solid and hallow sway bars. picture 1 . Shock Springs: The purpose of the Springs is to keep the car level during acceleration, deceleration, and cornering. We are also adding overall spring rate and taking advantage of the aero grip created by modern day body designs. 9K Spring Rate. We are proud to be able to offer you free information on coil overs, airshox, trailing arms, 930 cv's, 3x3 trailing arms, 3 link systems, and tons of specs A car is moving at a rate of 10 m/s to the right and begins accelerating uniformly for 10 s. Solving for … Compression Spring Calculator. 4mm. Every inch you screw the spring perch down is another inch of preload. 9 kg/mm spring. Open spring pressure is a func-tion of the combination of spring rate, net valve lift and seat pres-sure. If kA is four times kB, xA must be half that of xB, so the energy required is the same for both springs. Car Cost Comparison Calculator “…will not only help you to forecast the REAL. Small angles can throw off your readings significantly. We decided to try Suspension Frequencies at the aggressive end of the Hz range for track cars, runing the numbers for 2. Knight Springs are comparable to top-tier drag race springs offered by other drag racing parts providers. See page 66 for discussion of spring rates, wheel rates, and motion ratio. Thus, the Eibach Racing Off-Road System (ERO) was born. The race car in the previous problem slows from 36 m/s to 15 m/s over 3. If we find the calculated Spring Rate with a 2. 5. Example 500lb/in ÷ 56 = 8. Leaf Spring Rate Calculator . how to calculate race car spring rate 0