asphalt circle track leaf spring setup

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. Installing a torque device combined with these types of suspensions will cause the wrap-up rate to be excessive. If too much of the bias is on the rear brakes, the car will be loose under heavier braking. Adding or removing as little as 50 pounds can also make a difference. Allstar Neck . I have talked to racers who run on tracks that require 1.75 to 2.00 inches of stagger. 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. If you stack a 10-inch 200 rate and 6-inch 200 rate spring, you get a combined rate of 100 pounds per square inch. The cure must address where the car is not handling and ideally not affect those areas where the car is good. The rubber, many times, will fall out due to the rigor of racing. So the actual change in spring rate was not an increase of 25# as was intended but a decrease of 2#. With the BBSS setups, reduced roll angle is the goal, so using a smaller sway bar is out of the question. When the shock travels, the divider between the shocks moves up the shock body. 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. 225lr/200rr Chrysler spring. We are only talking about a difference of 0.040- to 0.060-inch, but that is enough to help stabilize our car on exit and provide added bite. The disadvantage is that the spring will not tend to lock in place and may turn in the control-arm bucket. Address: 304 5th Creek Road, Statesville, NC, US, 28625; Good luck. A tight condition is the number one complaint from drivers. But if your running a stock 4 or 5 leaf set up. In addition, teams would not have to purchase expensive testing equipment. hb```9,"o@(Yf8 rijYd`Pu9s9`*fm3 fxEGG;`(1Aja;ZYm @PfdPhv` } >--`;Xo!H^`(, H)3](c0 Ri Recommended Basic Setups. LANDRUM SPRING is not responsible for any incorrect information listed. In addition, the choice of this material will allow a manufacture to wind the spring out of smaller wire to incorporate a larger pitch, which will inadvertently allow more travel and produce a lighter weight spring. The following spring/shock combinations are recommendations only. Alignment issues are defined as: A. rearend alignment, B. contact patch alignment, C. driveshaft to pinion/transmission alignment, and D. engine alignment. A very good set of adjustable shocks came with the car also and that helped us when it came time to do the setup. by 72firechicken Tue Jun 21, 2011 1:34 pm, Post It is important to design the spring to its environment as well as its intended use. Increase the Angle of the Upper Trailing Arm. If the front is diving under braking then add anti-dive to front suspension. So testing for the fastest lap does not guarantee success. The idea is to steer the car using different height holes for the rear control arm mounts. Post Furthermore, if in the event that there is a spring failure, we can trace the springs history and make up all the way back to the wire source. Still, teams want the most they can get out of their cars and if all of the above nine items are in order, by all means, go ahead with aero tweaking. Remember that drag is an important aspect of aero design. 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. The engine should always be aligned perpendicular to the rearend and/or parallel to the centerline of the car. by racerx1622 Mon Aug 29, 2011 11:34 pm, Post This malady is more common than most racers know. This is not the same amount at all positions of the spring, and is different for the spring as installed. When the LR tire is the coolest on the car, the rear spring split may be too much. The spring rates and spring split across each axle help determine the desired attitude, or roll angle of that end of the car. If you lightly brake into the corner and the problem diminishes, then brake bias is the culprit. Major League Baseball has . On some tracks, with cars using Detroit Locker rear differentials, the accelerating portion radius will be larger than the mid-turn radius. The entry and exit to and from the middle are affected by transitional components in the car. If the LR shock has too much rebound, then that tire will lose a lot of load and not be able to provide traction. 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. Plan out changes that could help improve performance or durability. The opposite of Ackermann is called reverse Ackermann. Clipshave a profound effect on spring rates. We mostly use the sway bar to tune for traction off the corners. 2022 Landrum Performance Springs.All Rights Reserved. Also, check out QA1's YouTube channel for tech, product and company videos! The open-end type springs are required when spring security of location is desired. Higher arch springs tend to work better on the dirt tracks whereas the lower arch springs perform better on the asphalt tracks. Increase the Caster. Since each spring is bearing 50 pounds of weight, the 25 pound spring will compress two inches, and the 50 pound spring will compress one inch. 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! The spring rates and spring split across each axle help determine the desired attitude, or roll angle of that end of the car. This force is resisted by the ball joints and control amrs. SHADOW RACING PRODUCTS973.684.7270www.shadowracing.com. Here is a recent quote from a reader who has found that perfect balance. The front half of the leaf spring should be sufficient to control rapid positive torque. When running balanced setups that work the left-front tire, we must eliminate most of the Ackermann. 0 SHOCK SELECTION For example, ARCA and other type stock-car chassis whose accuracy of pit stop changes are a necessity. SPRINGS WITH HIDDEN COST $$:Simply put it, buyingGOLD COILSmay save most any race team money. A trend must prove itself in order to stand the test of time. These lightweight clips simply cannot withstand the tremendous forces encountered in racing leaf springs. The actual total spring change instead of 200#s is 410#, over 100% more or twice the spring change desired. The shape of the racetrack can affect how the car is balanced when exiting the turns. Furthermore, the crew made unnecessary changes, wasted valuable time, resulting in wear and tear on the engine, tires and other components. If and when the length exceeds the outside diameter ratio then the spring will tend to bow, similar to the shape of a banana. At Apex Customs Phoenix our expert technicians understand that every suspension package is . The front end should always be weighed to ensure proper spring selection. The track at Santan Junior High School is missing some info Please fill out the form below if you have the local knowledge to help your fellow runners. 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. In addition, banding clips are frail and tend to break under impact or stress. We are at a crossroads at this point in time with setup technology in asphalt racing. When should one use high or low arched springs? So, with the Detroit Locker rear end, stagger should match the radius of the turn where the car is starting to accelerate and the rear end is locked. This can make the car very loose and we need to adjust the suspension components so that it will not steer in this manner. Measure from the main leaf to the datum line. (2.) The very last thing you need to worry about is your aero package. By Bob Bolles, Circle Track Magazine . On the bottom of the leaf, you can get a better look at the segment clamps. Recommended torque is 20 lbs. If the wheel is turned farther at speed, the car is tight. Yes, I get inquiries about how to apply the BBSS setups to both of these types of cars. This applies equally to the shackle and slider ends. 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). Our springs are available in a wide range of sizes and rates. Roughly 8-10 degrees of third link angle is sufficient to promote antisquat and not hurt your corner entry. Leaf springs are the oldest form of suspension in racing. Example the leaf will be 2 1/2 wide throughout its length, and .323 in thickness throughout its entire length. LANDRUM SPRINGS engineers have found that by using two of the same spring rates, but installing one of the springs with a higher arch (for example on the left rear) is not recommended. Our extensive testing has proven this component to produce very erratic handling characteristics. In the QA1 part numbers, which is first - compression or rebound? 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. Remove the spring from the car and place it on its side on the floor or a flat surface. Allstar Performance $44.99. As a result, the inboard springs are mounted the softer the installed rate will be. The less angle the better. Most top shock technicians will be able to help you select the proper shock rates to go along with your particular setup related to your type of racetrack. 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. endstream endobj 209 0 obj <. A loose or tight car can also be caused by a tight or loose setup. If you have to steer to the right at mid-turn, bring the car back in. SPRING ENDS:The ends of a spring are one of the most crucial of a coil spring. Run the car at a moderate speed through the middle well below race speed and note how far the steering wheel is turned. After the supposed spring change, the team then began to change shocks, sway-bars, and pan-hard bar heights. As each season comes along, our knowledge of what we need and desire grows. Shock rebound rates need to be adjusted to allow the LR tire to stay in contact with the racing surface. Installation Guides Spring Rate Tech Circle Track FAQs Below are some frequently asked questions. This is very "old school" but when applied with a balanced setup, very effective.

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