This is important due to the fact that some springs may be in various warehouses, dealers and chassis shops for up to two three years before reaching the race team. Smaller gains can come later on after the more important aspects of setup are resolved. One of the very first tasks in setting up a race car is to make sure all of the alignment issues have been corrected. 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. The disadvantage is that the spring will not tend to lock in place and may turn in the control-arm bucket. That is the best description of the result of the dynamic force that influences each system. Numerous car builders have come to realize the truth in the above statements. Too light of a spring rate will also cause the rear end to lose an excessive amount of pinion angle under acceleration, leading to a loss of forward bite. %PDF-1.5 % LANDRUM SPRING and many of the top chassis manufacturers recommend that the shackles never extend straight back. This can be caused by several different conditions, or a combination of those. Landrum Spring feels that forging has more negative than positiveeffects and should not be used in racing applications where accurately rated springs are crucial. This condition is very hard to detect from a driver's perspective. The very first step in the process of preparing for the new season is to consider all performance-related items and how they worked last season. If all else were correct, such as alignment, Ackermann, setup balance, and so on, and the car was still tight or loose, then the crossweight percentage is probably wrong for the weight distribution in the car. Rear Steer Design - Chassis Setup For Improved Cornering - Circle Track After viewing the data sheets we found that the 375# tagged spring was actually a 387# and the 400# tagged spring was a 385#. Setting the Bar - JOES Racing Products By purchasing springs that are already accurately rated, you will not have to pay your engineer ($$), team manager ($$), or crew chief ($$) to rate springs that you have purchased. If the same stiffly shocked corner is in rebound, less of the overall load will be retained by that corner, and its diagonal corner as well, during the rebound cycle only. Trends are a part of this learning curve and greatly influence some, but not all racers. I don't really encourage that method. Stagger affects handling in each phase of the corner if the car has a locked rear differential. To accomplish a forged flat end, the spring material has to be heated more than once. Measuring the arch from the floor up to the main leaf is referred to as table arch.LANDRUM SPRINGdoes not recommend using this method to accurately measure spring arch. Knowing that every spring has its own characteristics, Landrum Spring, engraves the exact rate of each and everyGOLD COILto 1/10#. Rear Geometry Moreover, on super-speedways, the raised frame height will result in the car having to push too much air. As we use the left-front tire more. The opposite holds true, the shorter the shackle, the faster the rate of change. Decrease the RF Spring Rate. Our extensive testing has proven this component to produce very erratic handling characteristics. Off-centered adjusters can be very inconsistent. The rear tire sizes must be different in order to compensate for the turn radius so that the rpm in both rear wheels will be equal. We have redesigned our website to give our customers a better online shopping experience. Other helpful hints are available from our technical experts. In the QA1 part numbers, which is first - compression or rebound? Try to install shock rates to complement the car's setup. An unbalanced car can be very fast, although the thrill lasts but for a short time. Designed for drag racing where maximum weight transfer is needed. PHOENIX (3TV/CBS 5) Spring training fans can now mark their calendars about which games they want to attend. This system uses two springs on tip of each other in series. Inspect the end of the spring wire, if it appears to be splayed or tapered you can rest assure the ends have been forged. We mostly use the sway bar to tune for traction off the corners. lowers roll steer (tightens car on corner entry), increase pan hard rate (may tighten car in center of corner), lowers roll center (decreases chassis roll), raises roll steer (loosens car on corner entry), decrease pan hard rate (may loosen car in center of corner), raises roll center (increases chassis roll). asphalt metric street stock setup asphalt metric street stock setup on March 30, 2023 on March 30, 2023 With the exception of U-Bolts LANDRUM recommends Permatex Anti-Seize on all leaf spring bolts, pivoting points, and slider components to promote free movement in the suspension. I don't get too many reports of continual, repeated wins and successes. These springs tend to stay locked in place when the suspension is unloaded; for instance, changing a tire during a pit stop. Circle Track - Asphalt Chassis | Allstar Performance This force is resisted by the ball joints and control amrs. by RCJ Wed Jun 22, 2011 9:05 am, Post 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. The components that locate the rear end must be evaluated and set correctly. 224 0 obj <>/Filter/FlateDecode/ID[<04189D418AA83747B285A384057BE34D>]/Index[208 34]/Info 207 0 R/Length 92/Prev 972353/Root 209 0 R/Size 242/Type/XRef/W[1 3 1]>>stream x 13tall x 200# coil spring) may be engraved 201.8. Adjusting That Rear End: Get Traction Under Control If and when the length exceeds the outside diameter ratio then the spring will tend to bow, similar to the shape of a banana. 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. The Antis EveryGOLD COILhas its own dyno sheets incorporated in its box when leaving our facility. The ground end springs are the best way to achieve complete spring square-ness. The front moment center (MC) location plays a huge role in how the front end wants to work. Allstar Performance $44.99. Slinging the car into the corner or spinning out puts an extreme amount of lateral force on the springs which in turn, causes premature failure. Antidive effect can help the situation. The shorter upper A-arm decreases in length faster than the lower control arm causing camber loss. The following spring/shock combinations are recommendations only. $119.99; 119 - Reward points. Complete kit includes a pedal with a built-in return spring and throttle stop, universal firewall bell crank. The upper BJ is trying to be forced in a forward direction and the lower BJ is trying to be forced in a rearward direction. 4. Like anything else, all suggestions are just what they are "suggestions." All cars and drivers are not alike, but in general these are . If the shackles are long and do not have any middle support or bracing, then the shackle tends to absorb more of the twisting instead of the spring; therefore, your lateral resistance is less. A common misconception is that arch affects free spring rate, which it does not. Asphalt Handling Fixes - Mid-Turn Handling - Circle Track Magazine How to raise the cross weight in an iRacing asphalt setup. Place the straight edge on the spring so that it intersects the front and rear bushing. When running balanced setups that work the left-front tire, we must eliminate most of the Ackermann. Asphalt Late Model-Super Late Model Panels and Kits; . These bushings produce a solid rear housing displacement for added traction. With the BBSS setups, reduced roll angle is the goal, so using a smaller sway bar is out of the question. The same theory applies to leaf springs. Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). It is possible to have Ackermann in our steering system when we steer left and reverse Ackermann when we steer to the right. It consists of a center bolt that properly aligns the leaves and clips to resist its individual leaves from twisting and shifting. CORRECT MARKING:Having a spring with the correct markings is very crucial. The tight or loose condition can exist in one or more of the three phases of a turn (entry, middle, and exit). Generally the spring rate will increase when the following is done or decrease on the opposite. Leaf Spring Overall Length. PDF By Bob Bolles, Circle Track Magazine Frost Racing - Setup Tips Multi-Leaf springs used for racing should have a clench clip type system. Each suspension system desires to do its own thing when lateral forces are introduced from the car going through the turns. Antidive helps prevent sudden nose dive on entry by mechanically resisting the downward motion of the suspension using the rotational forces created through braking. Stiffening the LF and/or softening the RF spring decreases dynamic wedge during deceleration. But the most useful rear steer will only occur on acceleration and not at mid-turn. 200 x 200 = 40,000 (Top Spring Rate X Bottom Spring Rate)200 + 200 = 400 (Top Spring Rate + Bottom Spring Rate)40,000 400 = 100 Rate, Click here to download as PDF Chevrolet. Both of these are necessary components that will be needed to win championships. The right-side tire contact patches will also need to be inline with the right front tire pointed straight ahead. Leaf Spring Technical Information. The message I get from those who have worked this trend for a sufficient number of years is one of the following two types: 1) a continuing and constant search for balance in the car and a loss of success on the track, or 2) a returning to the more conventional setups because they have experienced number 1 above. Circle Track - Asphalt Suspension | Allstar Performance DESIGN: Most coil spring failure is directly related to the design of the spring. On a metric four-link car, the four control arms determine the rear moment center height too. 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. I would try it. Circle Track - Asphalt; Circle Track - Dirt; Open Wheel - Sprint Car; Off-Road & Tractor Pulling; All Categories ; Shop By Price $0.00 - $98.00 . Plan your shock layout by comparing the stiffness of one to the other corners and to the spring stiffness at the corner you are trying to control. Adding or removing as little as 50 pounds can also make a difference. The less angle the better. A-Arm length and mounting height have a dramatic effect on Instant Center Location. Free of . The basics remain the same, but with a few critical adjustments. The idea is to steer the car using different height holes for the rear control arm mounts. Mono Leaf Spring Consists of one main leaf where the materials width and thickness are constant. These are the general rules unless you are trying to "tie down" a corner. Different bushing diameters and unleveled floors will lead to inaccurate measurements. Racing Shocks Setup Tips Some rear suspension systems can be adjusted for rear steer. 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. It must show a consistent gain in performance and a logical ideology to the bulk of race teams. Because the front tires generate more traction with a greater angle of attack, the driver is actually putting more traction into the front end. Choosing too light of a spring rate will cause the spring to be in a higher stress situation, thus losing ride height. Softer grades tend to stretch under stress created while tightening instead of maintaining compression between the spring and axle perch. Asphalt Chassis Setup - Prepare Your Race Car For The New Season Examine the spring immediately upon receiving. With a Detroit Locker, or similar differential, the axles will unlock going in and through the middle and lock up on exit while under power. Shackle rigidity and length play a role in the installed rate as well. 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. Leaves that are tapered on the ends are generally used for mass production applications which do not require the close tolerances and consistency in the spring rate that racers demand. We will need to go through a checklist to eliminate some familiar problems. Note:To get the desired front end height (ride height), it may be necessary to modify the springs. This happens very quickly and the rear end snaps loose as the throttle is applied. 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. The overall general rule is that the angles between the driveshaft and both the pinion shaft and the transmission output shaft need to be equal and in opposite directions. We will cover the different aspects of leaf springs from free rate to installed rate, applications, hook up points and other performance enhancing factors. Stock cars using the metric-style four-link rear suspension usually need to do this just to achieve a balanced setup with the high rear moment centers in those cars.