Leaf springs possess many desirable suspension features, such as dampening, forward bite, roll over steer, high anti-squat percentage, and high lateral stiffness. As the front brakes are applied, the caliper grabs the rotor and the motion of the wheel/rotor tries to rotate the spindle. Off-centered adjusters can be very inconsistent. Welcome to our new website! e; Raise the Rear Panhard Bar Up on both sides. by RCJ Tue Aug 30, 2011 9:30 pm, Powered by phpBB Forum Software phpBB Limited, Shocks, Springs, Brakes, Frame, Body Work, etc, Hi anybody out there have any experience with rear leaf spring suspensions? "In the 50-lap Main, our fastest lap time was clocked on Lap 43. It doesnt solve the problem of multiple heat runs it simply tries to hide the fact. Carrying an inventory of A-Arm lengths gives you more Instant Center Adjustment choices right at the track. This system uses two springs on tip of each other in series. When it happens on the right front, the chassis will gain bite. Generally the spring rate will increase when the following is done or decrease on the opposite. This puts undue stress on the leaf springs. Rubber bushings tend to absorb more energy and loads from the chassis and rear end, therefore the springs tend to last longer. Most teams that do this also run the BBSS setups and desire to drop the front end as low as possible and as quickly as possible on turn entry. The RR tire will be the only one trying to accelerate the car, and it might spin. Softer grades tend to stretch under stress created while tightening instead of maintaining compression between the spring and axle perch. We race a '76 Pontiac LeMans with the 4 link rear. Increase the Rear Brake Bias. Make sure your brake bias is tuned correctly. Eliminate most of your bumpsteer and Ackermann and install the correct steering ratio for your track that would suite the driver. To fix this, reduce the rebound rate in the LR shock and/or stiffen the compression rate on the right-front shock. Bushingchoice can affect spring rates. Leaf springs perform the following tasks: Due to all the loads leaf springs are under, it is one of the most stressed components on the race car. When the shock travels, the divider between the shocks moves up the shock body. Springs with banding type clips (see Figure 1) with rubber insulation produce inconsistent spring rates due to the fact of various durometer hardnesses and the deterioration of rubber compounds. 3. Every time that the material is heated, it removes carbon from the material. For instance, a J200 (5o.d. The front end should always be weighed to ensure proper spring selection. I don't get too many reports of continual, repeated wins and successes. SHOCK SELECTION Every race car needs a certain amount of tire stagger. Here is a recent quote from a reader who has found that perfect balance. A particular car at each racetrack will require a certain amount of rear stagger. The wedge/bite will be determined by the rear spring split (different spring rate from left to right) combined with the front springs and the size of lowering blocks used. With this system you can run a softer rate on the top and a stronger rate on the bottom. A dampening shock may be used to tighten the car on entry. Usually a 60-65 percent front and 35-40 percent rear bias works for most tracks. The car came with everything the team needed except the motor and tranny. Take this into consideration when adding a fiberglass hood, aluminum heads, or when putting the battery in the trunk. This is not the same amount at all positions of the spring, and is different for the spring as installed. LIT-718 80291 1997 - 2004 Mustang Radiator. CORRECT MARKING:Having a spring with the correct markings is very crucial. by 72firechicken Tue Jun 21, 2011 1:34 pm, Post I have talked to racers who run on tracks that require 1.75 to 2.00 inches of stagger. It has been found that the misalignment of your tires/wheels presents serious drawbacks to a finely tuned chassis and setup. The true rate of the spring, not just a tag denoting theoretical rate. There are several things we can do to help balance the car. SERIAL NUMBER:Having a spring that has its own serial number is important. Yes there's aftermarket springs that work great on there own to combat wheel hop if you don't want to or can't run traction bars. Each and every data sheet clearly shows the pre load as well as the displacement that the spring was tested at. Anything you can do to give you more adjustabilty should be a positive.An eccentric bushing that is adjustable is something to look for.1'' wedge with a floorjack,I would be cutting up houseing and moving the pumkin.Swaybar preload and wheel offsets are areas to look at. asphalt metric street stock setup asphalt metric street stock setup on March 30, 2023 on March 30, 2023 The basics remain the same, but with a few critical adjustments. We hope you enjoy shopping at Circle Track Supply, Inc. Antisquat results from the third link trying to straighten out, or become more horizontal as the car accelerates and the rear end desires to rotate. A car can appear to be loose even though it is tight. Also, excessive torque of the shackle bolts will increase the installed rate. The engine vibration and the contact of the new wheel being installed on the hub face generally causes enough instability to cause the spring to shift in the pocket. Manufactured from only the best high-tensile chrome silicon material. The first heating of the material comes when the end of the wire is stamped and the second heating process is when the wire is being rolled to a coil form. We should start with the mid-turn handling because problems that affect the car in the middle can also affect the entry and exit. In turn, the life of the spring and the number of cycles is reduced. Published: Mar. If we can get the car to handle well in the middle, then we might have already solved some of the entry and exit problems, too. The left side suspension usually is designed with about half the angle of the right side in a conventional design. This leads to bent shackles, warped sliders and misaligned axis points. Apex is your one stop solution for automotive suspensions. The driveshaft doesn't know which view these angles are resulting from, just that they are equal and opposite. Proper U-bolt selection is critical, use only Grade 5 U-Bolts. Reduce the crossweight in a tight car and increase the crossweight percentage in a loose car. Loss of efficiency can rob power from the drivetrain due to the generation of vibrations and harmonics that are also damaging to the bearings. LANDRUM PERFORMANCE SPRINGSmakes no guarantees that these charts will be suitable for each racers needs. This malady is more common than most racers know. The once tight condition now switches to loose as the front gains grip from excess steering angle. Knowing this,Landrum Springas elected to rate, dyno, print (numerical as well as graphical data), engrave each springs serial# and rate. Welcome to Allstar Performance! The optional third day of the Performance Driving course offers extended track time with more in-car coaching and driver development. The overall work that a shock does is to resist the rebounding of the springs and control the speed of compression. Also, check out QA1's YouTube channel for tech, product and company videos! Some orders may take longer than normal, we apologize for any delays (we are trying!) Decrease LR Shock rebound and/or increase RF Shock compresion. A typical problem is a spring that has excessive arch in the center. The tight or loose condition can exist in one or more of the three phases of a turn (entry, middle, and exit). Parabolic Single Leaf Consists of one main leaf with a tapered thickness. The true arch of a leaf spring is derived from the measurement between the main leaf the leaf containing the bushings, and the datum line (the line that intersects the center of the front and rear bushings). Some springs may need .780 or .810 wire so as to not to be high stressed. Shocks We do not want to try to solve turn entry problems with the brake bias, we only need to make sure the car stays neutral in handling when the brakes are applied. In that time, a lot has changed with how racers on asphalt set up their cars. The very last thing you need to worry about is your aero package. This can make the car very loose and we need to adjust the suspension components so that it will not steer in this manner. Allstar Performance offers quality Circle Track Racing - Asphalt Suspension at a great price, check out our website today at allstarperformance.com. Drag Racing Front Spring Tec. If the car is diving excessively under heavy braking, the RF wheel will lose camber quickly and its tire will loose traction. Each end has its own moment arm length and resistance to roll as well as other factors. As a result, the spring will tend to fail under loads. Furthermore, the life of the spring will be extended due to the fact it is not under high stress, but more importantly, handling will be consistent. The reason I say that with confidence, is because I have gone up against more aero efficient cars with setups and body configurations that were aero-deficient and still out ran them. Measure the angle derived from the two lines. Most companies incorporate a metal tag denoting the theoretical rate of each spring. Knowing that every spring has its own characteristics, Landrum Spring, engraves the exact rate of each and everyGOLD COILto 1/10#. Furthermore, band clips are frail and tend to break, stretch and fail under minimal contact (opponents right front fender hits your left rear spring). By Bob Bolles, Circle Track Magazine . The disadvantage is that they produce inconsistent spring rates. Through interviewing various teams, we found that current spring suppliers were using many various methods of rating coil springs. In testing conventional setups over a five-year period, it was discovered that most tires want no change in camber relative to the racetrack surface as the car dives and rolls. Decrease the Pre-Load on the Stabilizer Bar. Powered by Stripe - Designed and Developed by. Clipshave a profound effect on spring rates. 269-463-8000; Sign in or Register; Compare ; Cart. Furthermore, a race team will not have to purchase additional springs to fill the void left by the springs that did not rate properly to the theoretical rate that they were supposed to be. 225lr/200rr Chrysler spring. How much does each spring compress? Disc brake spacers will further impact the height. The shape of the racetrack can affect how the car is balanced when exiting the turns. Different bushing diameters and unleveled floors will lead to inaccurate measurements. "By using two springs in series, the dual setup allows them to have a softer ride . Anything over 3 tends to be excessive and decreases forward bite due to the fact that the torque wrap up or forward thrust resistance of the rear end increases, therefore not allowing any wrap up or torque dampening to occur. Maximum U-bolt torque for 1/2 diameter, plated U-bolts are 45 lbs. Leaf Spring Conversion Chart. If you have to steer to the right at mid-turn, bring the car back in. The components that locate the rear end must be evaluated and set correctly. Usually, improved mid-turn handling offers the most gain in overall performance, and that is why we start there. LEGEND: May use 1 or 2 90/10 Dampening ShocksOver Rear End to Tighten Car on Corner Entry. It must show a consistent gain in performance and a logical ideology to the bulk of race teams. Setup With a big-bar Mike Leary of Leary Racing Shocks recommends adding wedge to the car by preloading the bar. If we arrange our control arm angles, from a side view, for antidive, then as the car dives the upper BJ would move to the rear and the bottom BJ would move to the front. The resins break down when exposed to heat and heat cycles (produced from exhaust and/or brake systems) which will cause the resin in the spring to become brittle, resulting in the spring collapsing. We can raise the Panhard bar to raise the rear roll center, which will cause the rear suspension to want to roll less. Racing Shocks Setup Tips for Dirt and Asphalt Here are some racing shock setup tips you can apply at the race track. Note:To get the desired front end height (ride height), it may be necessary to modify the springs. The following information applicable for most oval track Chrysler styles mono and multi-leaf leaf spring applications with the sliders mounted on the rear. To accomplish a forged flat end, the spring material has to be heated more than once. Rubber bushings tend to promote softer rates than solid bushings. This induces less rear steer when the car squats on exit. Our extensive testing has proven this component to produce very erratic handling characteristics. The driveshaft alignment is critical from the standpoint of mechanical efficiency. In the common asphalt setups of today, where we use a larger sway bar and softer springs (BBSS), the presence of Ackermann effect could be more detrimental. We have been softening those setups over the years, but never intended to go to coil bind or bump rubbers. The spring rates and spring split across each axle help determine the desired attitude, or roll angle of that end of the car. A loose or tight car can also be caused by a tight or loose setup. For example, if the main leaves are the same length and one spring has more arch, the spring with the most arch will have a stiffer installed rate. And, some aspects of chassis setup build on other aspects. If I have a split rate shock such as 3-5 and I turn the shock 180 degrees, will the shock then be a 5-3? Shocks affect the motion of the corners of the car and therefore the placement of loads during transitional periods. It's been three years since we discussed the subject of handling fixes. In disciplines like dirt and asphalt circle track racing, suspension setups often require a highly specialized approach in order to maximize stability and grip, and that's led manufacturers to develop a number of different ways to approach common issues. The difference is you also use a stop mechanism lock out nut that stops the travel of one of the springs at some point during shock travel to where the car is then riding on only one spring. We will look at each phase of the corner and offer handling remedies based on the phase they affect. Bump Steer Gauges; Canopies & Car covers; . Other helpful hints are available from our technical experts. Verify the leaf spring for consistency in the arch. So, there is a limit to how much you can get away with and still have a decent corner entry. Long gone are the days of saying that the MC is not important. Does it have actual print outs of each spring (data sheets)? I'm not saying this is not important to some degree, but on short tracks I would stress that aero downforce is over-rated in most cases. The shorter upper A-arm decreases in length faster than the lower control arm causing camber loss. Major League Baseball has . Changing spring rates is a primary setup tool to get both ends of the car to match up their attitudes. These theoretical rates are just that, Theoretical. Brake Bias STANDARDIZED TESTING:Landrum Springuses the same rating system that many of the race teams that participate in the premier race divisions (CUP, ARCA, and IRL uses.) Rear Geometry Whenever a manufacture sets up to run several hundred springs of one particular rate, the end result is less than perfect. For example, if the spring is beveled on the flat end instead of ground flat then the spring is not coming in true contact with the jack bolt plate. Like anything else, all suggestions are just what they are "suggestions." All cars and drivers are not alike, but in general these are . The more carbon removed from the material, the more hardness is removed from the wire. Afcos web site has leaf spring installation tips.I ran camaros and what I did was raise the front eye 3/4 and lower the rear 3/4''.A flatter spring has less rear steer and should have more anti squat.2'' lowering blocks is the most I ran,make some heavy duty ones yourself .I broke several that I bought.Check the toe out in the rear end houseing, heat and quench the tubes to get 1/8 toe in.Then string the car to get the r/r toed in. Asphalt Late Model-Super Late Model Panels and Kits; . Of the many components that can be changed on a race car chassis, the coil spring change brings about one of the most adverse effects on a chassis. FYI, the springs shown here are stock ride height for a 1970 Nova. Reduction of spring life due to high stress loads on the shackle end of the spring. The front moment center (MC) location plays a huge role in how the front end wants to work. It's no wonder. Remove the spring from the car and place it on its side on the floor or a flat surface. Because of restraints in design and the need for geometry controls for moment center placement, we have to live with those properties. Plan out changes that could help improve performance or durability. These methods, good or bad, can be confusing at times. Here are what we consider to be the 10 most important areas of chassis setup with No. TUNING THE CAR WITH SPRINGS REMEMBER: "STIFF SPRING GETS THE WEIGHT" Rear to front weight transfer (deceleration) POINTS TO REMEMBER: (1.) At the front end, we can do a few things to cause the front to roll more to try to match the rear roll angle. In addition, fiberglass springs are sensitive to heat. Moreover, accurate spring changes will allow teams to be more progressive in their test sessions and eventually reflect in their qualifying efforts and then onto the race. Here, we will examine the problems associated with a car that handles poorly and some logical steps to take to find the most balanced setup. The stacked spring concept is being used on the left rear, right front and sometimes on the right rear to fine tune the race car. I would try it. We also want to make sure that adjustments to other segments later on do not affect the mid-turn handling. So in some cases, using chrome vanadium for higher rated springs is a better choose than chrome silicon. These desires are directly influenced by the spring stiffness, location, and spring split, the sprung weight the system has to support, along with the moment center locations and other settings. The other types of ends are the closed and open tangential ends. The tire temperatures still supported his feel. The following information and diagram may be beneficial for installing and checking mounting points. Shackle rigidity and length play a role in the installed rate as well. by 72firechicken Thu Jun 23, 2011 2:12 am, Post Controls the rate at which the chassis rolls, Controls lateral forces such as side load, pan hard, or side bite rate, Sets wheel base lengths during acceleration and deceleration. These types are desirable where stock lower control arms are used. Softening the LF and/or stiffening the RF spring increases dynamic wedge during deceleration. The springs length, width, thickness, number of leaves, hardness,bushings and clips determine the spring rate. This is how the spring segments are clamped together. Engineered to hold a great amount of stored energy for instant weight transfer. Allstar Neck . Either of these two can be caused by an unbalanced setup or by running with the wrong amount of crossweight. If the transition is abrupt and the top of the track drops to match the inside edge elevation, then the RF will follow the drop-off and unload the LR wheel. One of the very first tasks in setting up a race car is to make sure all of the alignment issues have been corrected. DISPOSE OF DAMAGED SPRINGS:While springs are made of a high-tensile strength wire, they are susceptible to damage from impact. Installing a torque device combined with these types of suspensions will cause the wrap-up rate to be excessive. Tapered end leaves have a gradual decrease in thickness on each end. The overall rate and the layout of different shock rates on the car can greatly affect the weight distribution, and therefore the handling, in the transitional phases on the racetrack. Make small adjustments, about one half of one percent. The settings, including the moment center location, really do dictate how all of the other parts and pieces of setup will work. The opposite holds true, the shorter the shackle, the faster the rate of change. When installing these springs, the arch will be pulled out, creating higher stress on the spring that will eventually decrease the life of the spring. 5. 8. The car is loose right at mid-turn and off the corner. Good luck. That simple test has helped many teams quickly determine the status of their setups so they will quickly know which direction to go when tuning the mid-turn handling. %PDF-1.5 % "There are two or three basic setups which are really simple, compared to bar car setups. Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. The following diagram illustrates a top view of the rear leaf springs which may be useful in determining a splayed or toed in pattern of the oval track Chrysler set up. Leaf Spring Suspension Performance Tips. In addition, banding clips are frail and tend to break under impact or stress. Reusing a damaged spring could have negative consequences. Increase the Caster. hb```9,"o@(Yf8 rijYd`Pu9s9`*fm3 fxEGG;`(1Aja;ZYm @PfdPhv` } >--`;Xo!H^`(, H)3](c0 Ri Address: 304 5th Creek Road, Statesville, NC, US, 28625; Free Phone: 1-704-871-0817; This style is sufficient to control axle torque and dampening, while maintaining ride height. An unbalanced car can be very fast, although the thrill lasts but for a short time. HOPEFULLY THE INFORMATION CONTAINED IN THE TECHNICAL AREA HAS BEEN HELPFUL. Balance the Front and Rear stiffness. Furthermore,Landrum Springis recognized as the only company in the racing industry worldwide doing so. Simply grinding the spring flat after forging it is like putting excessive ketchup on a bad hamburger. Whether you're looking to drop your car for better handling and an enhanced look, or lift your truck so you can climb over rocks and trees and add that aggressive look, we've got you covered! I have had a lot of feedback from teams who did the same with the same results. For instance, a 1300 lb/in spring may be 1325 the first inch, 1395 the second and 1460 the third inch. How to raise the cross weight in an iRacing asphalt setup. How to Raise Cross Weight in iRacing Setup Try one or two click on each spring perch shown above to raise the cross weight. For example, if the spring industry standard is say 5%. A poor handling car is defined as one that is either loose (rear has less traction than the front) or tight (front has less traction than the rear). These bushings produce a solid rear housing displacement for added traction. Steering Geometry Fiberglass Leaf Spring The fiberglass leaf spring is made of a mixture of plastic fibers and resin; it is lighter than all other springs. 0 SAMPLES: If the front is diving under braking then add anti-dive to front suspension. At the end of the day, the springs where rated. LIT-719 80292 C7 Corvette Radiator. When the LR tire is the coolest on the car, the rear spring split may be too much. The setup is balanced when the LF and LR tire temps are similar. Since only the bottom spring is now the only one working, its rate is what the car runs on, as long as the shock is compressed to the predetermined point.

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