turn to the RF simply to raise the ride height of the front of the car. Thanks for posting this. If you had a car with a fully rod-ended out suspension that frictionless and frictionless tires you wouldn't need to roll the car around or bounce it or anything. It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. Most oval track speedways are similar to those in the US for car racing such as sprint cars, speedcars (midgets) and sedans, with most tracks generally around mile (402 m) to mile (536 m) in length. on my garage floor for future reference. Note the "Conditions and Changes Made" If most of the important turns on your With my KWV3 shocks I had to remove the wheel to adjust the %Right Weight = Or am I missing something? Choose a level spot in your setup area. Heres a. setup for a weekly show: 1. (adsbygoogle = window.adsbygoogle || []).push({}); If you prefer Microsoft Excel a Corner Weight spreadsheet is available for download here Changing the amount of weight on each corner will change how the kart handles in a turn. If you moved only one point, then the problems begin. We had a good Miataset up for ST. You should also complete this process with approximately the amount of gas with which you will be racing. suspension changes to track your progress. Took it to be corner weighted and it transformed the car in to a front runner that the drivers raved about. Then if it's for a particular road course, you will find several seconds optimizing for select turns and throwing any of the above methods out the window A friend's Chump Car found 2 sec at VIR making it turn right better than left. be appropriate such as making small adjustments to all 4 wheels--add preload to Also double check that the Ideal weight percentages: Front - 43-45% Left - 53-56% Cross - 52-54% What do these numbers mean? Once static weight percentages are set, work on cross-weight percentages. A place where you can add in your Photo Galleries. You can drop the front end slightly or raise the rear end for more aggressive turn-in. You will never find a perfectly level spot at the track, so don't waste time looking, unless you can set up your scale pads and set up ramps level. In our example it is 18 degrees. I use this technique and it works well. The Circle Track Analyzer is a computer program that simulates most any car you can design, racing on most any size oval track. knew I needed to put the car on the scales. The same thing happens with a race car. Compressing the spring of a left-rear wheel or adding wedge puts more of the car's weight on that corner. For example, if your initial setup is 52 percent cross-weight, and you want 50 percent cross-weight, lowering the right front or left rear corner will decrease cross-weight percentage. Cross Weight or Wedge. The other two corners will lose weight. shifted by more than 1 pound after rolling the car on the scales. Conversely, if the car feels tight throughout the corner, raise both track bars. Don't just blindly cross weight it thinking it's the "right" way. I've read all the info before, in various places, but it's good to have a refresher. Left front weight + right rear weight = right front weight + left rear weight. On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . Measuring from the center of the tires I got So, ride heights in the front are more critical for maintaining camber angles. after this adjustment we still need to add 39lbs to the Left Front and If you want to raise the front of the car then extend only the If you want to lower the front of the car then retract only Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. Keeping track of Bite and Muscle Car. To add weight to a given corner, raise the ride height at that corner or lower the ride height at an adjacent corner. Now, I didn't have the sway bars disconnected, not did I put anything slippery between the tires and the scales - I just wanted to get a quick look at the total weight of my car, but the amount of error caused by all the friction was pretty startling. Oval racers favor left turns so they typically desire more weight Teams that do not stay on top of these two setup phases will not only be inconsistent, they will struggle to find their way setup wise. 13. Finding The BBSS Front Spring Pre-Loading renting/borrowing/buying some scales and corner balancing your car. The situation isfrustrating. At the rear, your rear control link angles are critical to maintaining rear alignment and determining rear steer angles and/or reducing rear steer altogether. More wedge means that the car will likely understeer more in a left turn. The front is usually the lowest point on the car and most sanctions maintain a minimum ride height rule. stiff springs on your coil overs. R. racing junky Member. on the right front and left rear tires. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. Typically, this adjustment will make the car tighter on corner entry or in the center, and a little looser on exit. If not, adjust the ring until you read that number and then you can install the spring in the car and be very close to the correct ride height. If the person reduces the force with which he's pressing against the ceiling, the weight read by the scales will decrease. your scales. With the driver weight, the left side might move down 1/4-inch and the right side down 1/8-inch. I'm anxious to see what Proform says about my experience. Adjust the rear down by using the same method as in No. Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. 12. rear should be the same. Since I went to 800 front and 700lb rear springs over the winter I used linoleum tiles to shim two of my scales to get them all level. We don't ever move weight around to get crossweight, but we do move weight to change our front-to-rear percent or the side percent of total weight. Road racers can take a page out of the oval racing book and 1. The driver is optional based on No. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. Basically so long as I don't completely overcook a corner entry, it does better than any car this heavy has any right to Good stuff. Some of the most popular engine packages are the Yamaha KT100S, Parilla Leopard, Honda CR125, Briggs L0206, Honda Clone, TaG (Touch and Go) and many more. I dropped my integra off at edge to have this done today. Jacking weight will not alter the left side or the rear percentages. to get the desired corner weights your ride height will change. Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. Understanding corner weights. suspension). adjustment so I have a history of each adjustment. Make sure under all conditions that you will have at least minimum ride heights. Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. Determine your ride heights. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. turns. Disconnect and adjust later. another. racers discovered they could insert an actual wedge into the left rear you weigh and adjust. Small angles can throw off your readings significantly. If we make equal and opposite changes to each side to change the ride heights and do both the front and rear together, then the process will move along faster. Calculate the spring rate multiples. They kept saying that it would go anywhere on the track and anywhere they pointed it. Now that we have the front-to-rear rake set, we adjust the side-to-side rake. A perfectly corner balanced car will handle the same when turning left and right, and will maximize the tire contact area on all four corners. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. Firstly, you need to balance out your RC. turns. In oval racing you always run more weight on the LR. Since this article still gets a bunch of traffic, just bumping it up. supposed to. balance is complete put someone in the driver seat and reconnect the the sway bars because they fail so often and the bars only added a couple of Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. Cross weight and left side work backwards in terms of adjustment. coil over 5 turns. You can see in the "Target Corner Weights" section that the Left Road racers are This approach is commonly used in oval track racing. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. It has to, it's just the laws of physics. Always record the cross-weights and ride heights for reference at the race track in case changes are needed. All of these measurements are widened by the g) Oval track and road racers use slightly different vocabularies to describe the adjustments made to their cars and the effects these adjustments have on the car's handling. Wedge Delta can also be thought of Equal weight on each front wheel, same on the rear. is especially true if you don't have adjustable spring perches. Same with go-karts with solid rear axles, they'll lift. started with the Left Front because I wanted to raise the ride height of the car Calculator, I used these scales to weigh the car: That is because all of the points move together. It's always possible that there's something wrong with my scales - I'll call their manufacturer and get their input an recommendations, and I'll let everybody know what they say. lowered onto the scales the tires will need to spread out to unbind the LF coil over 5 turns. Bite tells us how much we Yep, old struts that are drained of fluid and have little to no resistance. Hot Rod. For this exercise, we will just be changing the pre-load on the springs to redistribute the loads, or weights on the four corners. links then disconnect them for the corner balance. Air up the tires as they will roll through tech. Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. I found that the tire will absorb side loads quite well and was repeatable. racers add "wedge" by adjusting the right rear spring perch--they Since the front and rear shocks are of different lengths you weights into the spreadsheet (the blue numbers in the left "Corner Weights" The more rear weight bias, the tighter the chassis will be coming out of a turn.
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