asphalt circle track leaf spring setup

If a user was to lose their sheets then we should be able to pull the data up at a later date. Some rear suspension systems can be adjusted for rear steer. The opposite occurs when the springs are mounted outward (closer to the wheels). This happens very quickly and the rear end snaps loose as the throttle is applied. This tends to tighten the car on corner entry and through the middle of the corner. The driveshaft alignment is critical from the standpoint of mechanical efficiency. Decrease RR Trailing Arm length by 1/8 inch. DATA PRINTOUTS:Having springs packaged with data information is crucial to any serious race team. With the LF A-arm being shorter than the LF lower control arm your car will lose camber under the left front suspension compression created by the big bar soft spring set up. On parabolic and multi-leaf applications, it is not recommended to run a torque device, such as a torque arm or a spring or rubber torque link. 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. On some tracks, with cars using Detroit Locker rear differentials, the accelerating portion radius will be larger than the mid-turn radius. Since the spring promotes rebound and resists compression as inherent properties, then the shock rate of compression control must be less than the rate of rebound control. At Apex Customs Phoenix our expert technicians understand that every suspension package is . Considering 4-link systems dominate the late-model market and even some classics, let's start there. Sometimes the car is tight and the driver turns the steering wheel far enough to get the car to turn. After the supposed spring change, the team then began to change shocks, sway-bars, and pan-hard bar heights. Fiberglass Leaf Spring The fiberglass leaf spring is made of a mixture of plastic fibers and resin; it is lighter than all other springs. The following is a list of things that can make the car not want to turn or make the car loose. It has been found that the misalignment of your tires/wheels presents serious drawbacks to a finely tuned chassis and setup. 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. Off-centered adjusters can be very inconsistent. Oval Track Leaf Spring Mounting Point. 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. A very good set of adjustable shocks came with the car also and that helped us when it came time to do the setup. The clip is installed by using a hydraulic press to assure proper tightness. Some springs may need .780 or .810 wire so as to not to be high stressed. Driving style plays a major role in the life of a leaf spring. Listed below are the effects of spring arch. In the next issue of CT, we will delve into the setup problems for a dirt car. Bump Steer Gauges & Set Up Tools; Stagger Tools; Tire Temp Gauges; Toe Tools; Turn Plates; . 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. LIT-722 C7 Z06 Corvette Heat Exchanger 80294NDP. No matter which stiffness you decide to go with, the most important aspect of setup is balance, and you achieve that balance with the correct combination of springs, moment centers, sway bars, and load distribution. The reason less shackle angle, more preload on each leaf, and a taller resistance line. Let's stay with the circle track lingo. Trends are a part of this learning curve and greatly influence some, but not all racers. The driveshaft doesn't know which view these angles are resulting from, just that they are equal and opposite. The closer the leaf springs are mounted together (inboard), the more pressure the chassis exerts on the springs through physical leverage. Note:To get the desired front end height (ride height), it may be necessary to modify the springs. You must try to determine if your setup is balanced and then if not, make the necessary changes to bring it into a balanced state. Post The springs are tall and constructed from small-diameter, high-tensile chrome silicon wire, providing the correct rate for the listed application. 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. Chrome silicon generally comes only in no larger than a .625 size from wire suppliers in the USA. Also, common mishaps of spilling brake fluid or brake fluid contact from simply bleeding the brakes will deteriorate the rubber and break the composite down; therefore, the rubber will fall out and the clips will be loose and slide down the main leaf. by racerx1622 Thu Aug 25, 2011 5:51 pm, Post . DISPOSE OF DAMAGED SPRINGS:While springs are made of a high-tensile strength wire, they are susceptible to damage from impact. In some instances the manufacture may have to choose chrome vanadium wire, instead of chrome silicon. In addition, as the spring is put under load the shackle angle increases; therefore, the spring rate decreases under travel. It must show a consistent gain in performance and a logical ideology to the bulk of race teams. The control arm angles affect the rear steer and the third-link angle can redistribute load upon acceleration. To increase resistance on the left rear, one may incorporate a 225 lb. At some point, we take in enough information to allow us to avoid the mistakes of the past and get ahead of the curve in setting up our asphalt cars. WAYS TO ENHANCE PERFORMANCE AND LONGEVITY OF LEAF SPRINGS. Due to the fact of the popularity of the leaf spring system, we felt racers may want to understand more about how the suspension actually works. Theinboard mounting positionof the springs play an important role as well. $119.99; 119 - Reward points. These types are desirable where stock lower control arms are used. If the rear end is not aligned properly, the car may be either tight or loose in all three phases of the turns. Increase the Rear Tire Stagger. Furthermore, because the front eye is allowed to pivot, it does not have any solid displacement to drive the car forward. Forged ends are only desirable when mass production of a loose tolerance spring is acceptable, for example, the agriculture or industrial industry. The free rate is generally progressive, meaning that the leaf spring rate does not increase proportional to the rate of deflection. 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. endstream endobj 209 0 obj <. A car can appear to be loose even though it is tight. Designed for drag racing where maximum weight transfer is needed. 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. 7. Neck Mount 1.525in Black ALL14475. Furthermore, the leaves should include Teflon inserts on each end to reduce inner leaf friction. So, with some of the information we have learned over those years applied, here is a modernized version of that article. Here is a recent quote from a reader who has found that perfect balance. Leaf Spring Overall Length. Brake bias influence can be easily determined by entering the corner with medium to heavy braking first and then entering with light braking to see if there is a difference. The effect will be a lack of forward and side bite under acceleration. 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. Choosing too light of a spring rate will cause the spring to be in a higher stress situation, thus losing ride height. First, we needed to look at the previous setup to see what went wrong. Does it have actual print outs of each spring (data sheets)? Adding or removing as little as 50 pounds can also make a difference. I don't really encourage that method. Many factors affect the front end height, and wheel offset is a major consideration. 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. This system involves riveting the clips onto the leaves; the advantage is in preventing the clips from sliding up the leaf and becoming loose. This system uses two springs on tip of each other in series. Here are what we consider to be the 10 most important areas of chassis setup with No. As we use the left-front tire more and more, the negative results of Ackermann become more apparent. Engineered to hold a great amount of stored energy for instant weight transfer. 3. 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. Circle Track - Asphalt; Circle Track - Dirt; Open Wheel - Sprint Car; Off-Road & Tractor Pulling; All Categories ; Shop By Price $0.00 - $98.00 . Each end has its own moment arm length and resistance to roll as well as other factors. A trend must prove itself in order to stand the test of time. The effect is huge. Generally the spring rate will increase when the following is done or decrease on the opposite. The components that locate the rear end must be evaluated and set correctly. Since the braking forces are in the opposite direction, there is a serious resistant force created which helps prevent the front suspension from moving in compression too quickly while braking. So, again this year as in past years, we will present what is admittedly the formula for success related more for the conventional and what we call soft conventional setups mainly because these are the ones that produce more consistency and do win races. 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. Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). 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.) Many times hair-line fractures and cracks cannot be seen without the aid of a florescent penetrant inspection. The car may or may not be neutral in handling, but the handling will not be consistent. 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. 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! No one including us can guarantee every spring to rate out exactly. The number one reason a car will be tight and not want to turn is because the front end is not designed properly. When the front bushing is allowing the front leaf spring to pivot, it transfers all the side loads and lateral forces to rear portion of the leaf spring and shackles or sliders, which were not designed to handle the additional stress. The car is loose right at mid-turn and off the corner. Examine the spring immediately upon receiving. Rubber bushings tend to absorb more energy and loads from the chassis and rear end, therefore the springs tend to last longer. A shackle with a 3 degree layback incorporates a stiffer installed rate than a shackle at 25 degrees layback. DESIGN: Most coil spring failure is directly related to the design of the spring. We also want to make sure that adjustments to other segments later on do not affect the mid-turn handling. For instance, a J200 (5o.d. Each and every data sheet clearly shows the pre load as well as the displacement that the spring was tested at. The RR tire will be the only one trying to accelerate the car, and it might spin. With the BBSS setups, reduced roll angle is the goal, so using a smaller sway bar is out of the question. Are their hidden cost in the spring purchased? Clipshave a profound effect on spring rates. 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. Welcome to our new website! Make small adjustments, about one half of one percent. Powered by Stripe - Designed and Developed by. 4-Link Raise the Rear Panhard Bar Up on both sides. If this component on your car is not right, then the whole car will suffer, no matter what else you do. Because the front tires generate more traction with a greater angle of attack, the driver is actually putting more traction into the front end. The amount of difference you need is directly influenced by the installed motion ratio of the spring and the spring rate. When choosing a brand of coil springs several issues should be addressed. Measure the angle derived from the two lines. We can reduce the rear spring split if we are using a softer right-rear (RR) spring by stiffening the RR spring and/or reducing the LR spring rate. Furthermore, these solid bushings control and enhance chassis performance by resisting chassis roll/torque. When it happens on the right front, the chassis will gain bite. Rear Geometry Loss of efficiency can rob power from the drivetrain due to the generation of vibrations and harmonics that are also damaging to the bearings. Asphalt Late Model-Super Late Model Panels and Kits; . A typical problem is a spring that has excessive arch in the center. Furthermore, there will tend to be less stress on the spring and spring related because the pressure will be equally distributed throughout the spring and chassis. Therefore, less stagger should be used so that both rear wheels are turning the same rpm off the corner to avoid wheelspin. We have continually pressed these issues because of the extreme importance they have. Smaller gains can come later on after the more important aspects of setup are resolved. 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. It helps to install brake bias gauges and then adjust the amount of pressure front to rear. Other helpful hints are available from our technical experts. dQ#A$70 Q,6D|B@1" hKF? If we are loose going into the corner, the LR shock may be too stiff in rebound or the RF shock may be too soft in compression, which transfers load off the LR tire on initial entry under hard braking. That is fine as a goal, but what we really want is both balanced and neutral. on the left rear and 225 lbs. When running balanced setups that work the left-front tire, we must eliminate most of the Ackermann. Also, the longer the shackle length, the slower the arc movement which decreases the rate of the spring change. In addition, fiberglass springs are sensitive to heat. Numerous car builders have come to realize the truth in the above statements. 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. Stagger affects handling in each phase of the corner if the car has a locked rear differential. SERIAL NUMBER:Having a spring that has its own serial number is important. 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. When towing the race car, avoid strapping the vehicle by the chassis. Another problem occurs with inconsistent resin mix which will cause the leaf to splinter and break. Although these changes will alter the height of the car, the spring rates will be unaffected as long as you stay within the guidelines. This condition is very hard to detect from a driver's perspective. There are several things we can do to help balance the car. There can be a small amount of rear steer as the. This malady is more common than most racers know. The rear end should be at right angles to the chassis centerline, and the right side tire contact patches should be inline. Moving the pull-bar or just the third link to the left increases the loading on the LR tire during acceleration. hb```9,"o@(Yf8 rijYd`Pu9s9`*fm3 fxEGG;`(1Aja;ZYm @PfdPhv` } >--`;Xo!H^`(, H)3](c0 Ri FYI, the springs shown here are stock ride height for a 1970 Nova. Remove the spring from the car and place it on its side on the floor or a flat surface. The tire temperatures still supported his feel. 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. $259.99. Leaf Spring Suspension Performance Tips. Ackermann is easily checked by using a laser system or strings. You may not be able to find a 16-inch 100 rate spring, so this provides more spring length to use. We must develop ways to create more rear traction on acceleration only. This is the true arch of the spring. Roughly 8-10 degrees of third link angle is sufficient to promote antisquat and not hurt your corner entry. All of theGOLD COILSare packaged with dyno sheets detailing the dynamic rate in a graphical form as well as numerical form. These do not install with rubber isolators either. Leary sets the wedge in the springs and then adds additional wedge with 3-6 turns of preload and sometimes has winning success using 9 turns. Most companies incorporate a metal tag denoting the theoretical rate of each spring. These methods, good or bad, can be confusing at times. If and when the length exceeds the outside diameter ratio then the spring will tend to bow, similar to the shape of a banana. Setup With a big-bar Mike Leary of Leary Racing Shocks recommends adding wedge to the car by preloading the bar. CTS SUPER DUTY LEAF SPRING ROLLER STYLE SLIDER-CHEVY OR CHRYSLER STYLE. Decrease Upper Control Arm Angle on the Rearend. When the car is jacked up during a pit stop for a tire change, the suspension may become completely unloaded leaving the coil spring to rotate in the spring bucket. The optional third day of the Performance Driving course offers extended track time with more in-car coaching and driver development. TUNING THE CAR WITH SPRINGS REMEMBER: "STIFF SPRING GETS THE WEIGHT" Rear to front weight transfer (deceleration) POINTS TO REMEMBER: (1.) Negative aspects might include excessive bumpsteer (more than 0.030 bump in or out in for each inch of travel is considered negative by most designers), excessive Ackermann (more than a 1/4 degree added steer in either front wheel in 10 degrees of steering input is considered excessive), and incorrect steering quickness. 241 0 obj <>stream Leaf springs are the oldest form of suspension in racing. Meaning that as the spring is compressing it is gaining rate. Every time that the material is heated, it removes carbon from the material. "By using two springs in series, the dual setup allows them to have a softer ride . The cure must address where the car is not handling and ideally not affect those areas where the car is good. Although they are the oldest, they seem to be the least understood. Increase the LF Spring Rate. Inspect the end of the spring wire, if it appears to be splayed or tapered you can rest assure the ends have been forged. For example, if you want 250 lbs. Disc brake spacers will further impact the height. The more carbon removed from the material, the more hardness is removed from the wire. Measure from the main leaf to the datum line. Urethane and aluminum bushings tend to transfer more energy and loads directly to the spring. Always use Grade 5 washers and deep well nuts. 0 Try to install shock rates to complement the car's setup. So, there is a limit to how much you can get away with and still have a decent corner entry. 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? The opposite holds true, the shorter the shackle, the faster the rate of change. The dynamics of the moment center and the effects of camber change have been explained before. Landrum Spring feels that forging has more negative than positiveeffects and should not be used in racing applications where accurately rated springs are crucial. Decrease the Pre-Load on the Stabilizer Bar. Softer grades tend to stretch under stress created while tightening instead of maintaining compression between the spring and axle perch. Flat end springs are achieved in two different ways, ground or forged. Stiffening the LF and/or softening the RF spring decreases dynamic wedge during deceleration. This can make the car very loose and we need to adjust the suspension components so that it will not steer in this manner. 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. The center of gravity (CG) height influences where the MC should be located. 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. Drag Racing Front Spring Tec. For example, while testing at Charlotte, a car had a 375# tagged spring in the rear, the driver felt that the car was loose on corner entry and the Hoosier tire temperatures supported his feel. Antidive helps prevent sudden nose dive on entry by mechanically resisting the downward motion of the suspension using the rotational forces created through braking. As the rear end rotates on acceleration, the left wheel moves rearward more so than the right wheel, creating a slight amount of rear steer to the left. The less desired method is the forged or stamped method. Lower the front LR trailing arm mount. And, it must be economically applied. 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. In situations where the exit portion of the track provides less traction and/or the corner is more flat, we might need to develop more rear traction upon acceleration. Apex is your one stop solution for automotive suspensions. e; As a result, the inboard springs are mounted the softer the installed rate will be. While it is important to monitor free height for spring set, it is more crucial to know the actual rate in its working range. It consists of a center bolt that properly aligns the leaves and clips to resist its individual leaves from twisting and shifting. Behind the wheel of a Dodge Challenger SRT Hellcat Widebody, students will cover autocross, slalom, and accident avoidance, along with plenty of track time on the 1.6 mile Radford road course. 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. The front end should always be weighed to ensure proper spring selection. For example, ARCA and other type stock-car chassis whose accuracy of pit stop changes are a necessity. When using coil springs on the rear, changes are made with spring rates not the free height of the coil springs. LIT-721 80293NDP 2009-2015 Cadillac CTS-V HE. The front half of the leaf spring should be sufficient to control rapid positive torque. The more third link angle you have, the more antisquat there is. Next, tune the entry balance and then tune the exit balance. If the front is diving under braking then add anti-dive to front suspension. Decrease the RF Spring Rate. In addition, teams would not have to purchase expensive testing equipment. Through our research, diamond trimmed leaves produce the most consistent spring rate. This is an effect that increases the amount of toe-out in our race cars when we turn the steering wheel. These theoretical rates are just that, Theoretical. Furthermore, the crew made unnecessary changes, wasted valuable time, resulting in wear and tear on the engine, tires and other components. Here is an explanation of balance related to the dynamics of the race car. 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. Shackle rigidity and length play a role in the installed rate as well. 1/2" on RF (5 degree angle of Upper A-Frame mounting bolts), 1/4" on LF, front higher than back, average bolt height the same as before.

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