Example the leaf will be 2 1/2 wide throughout its length, and .323 in thickness throughout its entire length. Leaf springs possess many desirable suspension features, such as dampening, forward bite, roll over steer, high anti-squat percentage, and high lateral stiffness. (See Figure below.). These do not install with rubber isolators either. This puts undue stress on the leaf springs. Free of . Toggle menu. Furthermore, the crew made unnecessary changes, wasted valuable time, resulting in wear and tear on the engine, tires and other components. A tight condition is the number one complaint from drivers. This happens very quickly and the rear end snaps loose as the throttle is applied. The amount of difference you need is directly influenced by the installed motion ratio of the spring and the spring rate. 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. The closer the leaf springs are mounted together (inboard), the more pressure the chassis exerts on the springs through physical leverage. by racerx1622 Mon Aug 29, 2011 11:27 pm, Post As a result, the car will have unpredictable chassis characteristics and may cause premature tire wear. TUNING THE CAR WITH SPRINGS REMEMBER: "STIFF SPRING GETS THE WEIGHT" Rear to front weight transfer (deceleration) POINTS TO REMEMBER: (1.) SHADOW RACING PRODUCTS973.684.7270www.shadowracing.com. In addition, the leaf spring suspension is more forgiving on chassis set-up errors. Numerous car builders have come to realize the truth in the above statements. can develop a winning setup. If the leaf springs hook-up points are installed on the chassis incorrectly the misalignment will produce high stress loads on the spring. Because the front tires generate more traction with a greater angle of attack, the driver is actually putting more traction into the front end. Here is a typical situation found at any given track. The components that locate the rear end must be evaluated and set correctly. You can decrease the spring rate by increasing the angle, or increase the rate by decreasing the angle. Static deflection of a spring equals the static load divided by the rate at static load; it determines the stiffness of the suspension and the ride frequency of the vehicle. Cars with a lower CG should have a MC that ends up farther to the left side of the scale than would cars with a higher CG. With the car set up correctly, it is just a matter of experience and a little racing luck that brings that first win. Pivot bushings are bushings that were designed to remove the bind between the chassis and the spring. If there are any marks or distortions on the spring they should be discarded. 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. Complete kit includes a pedal with a built-in return spring and throttle stop, universal firewall bell crank. Next, tune the entry balance and then tune the exit balance. 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. Negative effects include limited number of spring cycles, loss of spring life, and loss in ride heights. Increase the Split in the Panhard Bar Heights. Parabolic Single Leaf Consists of one main leaf with a tapered thickness. What I hear I feel is representative, although those who dive head first into the BBSS mix not because of a perceived and measured expectation of success but because of the "see monkey, do monkey" attitude, will never share what they are doing. Leaf Spring Conversion Chart. When this is accomplished correctly, spring rates and reactions can be more accurately predicted which in turns makes the chassis more predictable. The completely closed-ends are used when the requirement is that rate remains more consistent throughout the coil springs travel. This insures properly made springs, guaranteed arch tolerances, access to complete labs for testing and research with technical racing experts to understand your requirements. Recommended Basic Setups. Brake Bias Low-banked tracks require a location more to the left and higher banked tracks are best set up with a MC more to the right of centerline. Solid bushings provide stable and predictable handling characteristics that lead to more consistent lap times. Rear Steer Design - Chassis Setup For Improved Cornering - Circle Track Decrease the Pre-Load on the Front Stabilizer Bar. x 13tall x 200# coil spring) may be engraved 201.8. The lateral location of the third link can affect the distribution of load among the two rear tires that results from acceleration and antisquat. 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. There are ways to do that without changing the handling at other points around the racetrack. This system uses two springs on tip of each other in series. Shocks e; Aero Package Do not seek aero downforce at the expense of aero drag increase. Furthermore, with the incorporation of the coil-over spring/shock type suspension, the coil spring and shock ratio is close together and operates as one unit. In the front-end geometry, there is a condition called Ackermann. Measure the angle derived from the two lines. Setup With a big-bar Mike Leary of Leary Racing Shocks recommends adding wedge to the car by preloading the bar. 208 0 obj <> endobj This system involves riveting the clips onto the leaves; the advantage is in preventing the clips from sliding up the leaf and becoming loose. Coil Spring Technical Information. This simple task will increase the life of the leaf spring dramatically. Spring rates range from 200-pounds to 225 pounds, plus you can specify three ride heights. Simply grinding the spring flat after forging it is like putting excessive ketchup on a bad hamburger. As each season comes along, our knowledge of what we need and desire grows. When towing the race car, avoid strapping the vehicle by the chassis. 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. 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. This is not the same amount at all positions of the spring, and is different for the spring as installed. Then all you have to do is maintain that balance throughout the season and that means resisting making changes that take you outside that envelope. Most companies incorporate a metal tag denoting the theoretical rate of each spring. Suspension Set-up There are two common suspension set-ups found on typical rear wheel drive vehicles at the track: 4-Link and Leaf Spring. Good luck. The less desired method is the forged or stamped method. If it is too far to one side, then changes to the brake master cylinder sizes and/or the pad compounds might need to be made in order to maintain a centered-bias adjuster. We have been softening those setups over the years, but never intended to go to coil bind or bump rubbers. With the advent of the BBSS setups, both front wheels experience a great deal of camber change as the chassis dives 3 inches or more in the turns with an accompanying reduction in chassis roll. Run the car at a moderate speed through the middle well below race speed and note how far the steering wheel is turned. This tends to tighten the car on corner entry and through the middle of the corner. 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 are at a crossroads at this point in time with setup technology in asphalt racing. And, it must be economically applied. It just won't work. Try to understand how aero downforce is created and then configure your car so that you take advantage of every area where you could produce more downforce. Our springs are available in a wide range of sizes and rates. Good handling has often been thought of as a car that is neutral as it runs through the entry, middle, and exit phases of the corner. As the front brakes are applied, the caliper grabs the rotor and the motion of the wheel/rotor tries to rotate the spindle. Decrease both Front Spring Rates. Powered by Stripe - Designed and Developed by. Sometimes the car is tight and the driver turns the steering wheel far enough to get the car to turn. Our extensive testing has proven this component to produce very erratic handling characteristics.
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