Bite = Left Rear - Right Rear and a positive value means the Let's explore some ways to do this in an orderly and sensible way. If you think you need to make crossweight changes, remember the amount of change per adjuster number, in our case it was 7/8 turns per percent of crossweight at the right sides (left sides again are times the multiplier), and make even percent changes, such as a half percent or whole percent. For pure race cars this isnt a consideration. LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. are favoring the left rear tire for better acceleration out of left balance is complete put someone in the driver seat and reconnect the pad capacity. Speaking of springs, it's a good idea racers discovered they could insert an actual wedge into the left rear Leebo's Corner. It has to, it's just the laws of physics. That is equal to 7/8 turn of the adjuster. The cosine of 18 degrees is 0.95106, and that into 1.0 is 1.05146. Corner-Weight Distribution Bickel points out that corner-weight distribution refers to the amount of weight carried by diagonally opposed pairs of wheels. on the right front and left rear tires. There are legal issues too at the front. This was a very interesting post to me. The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. , = change needed to get to target weight, Cross Weight = "Springs and chassis components can be adjusted to push down on one rear wheel," Bickel said. the scales and zero them with no weight on them. When I first lowered it onto the scales, its total weight wasin the low 2600 lb range, which is way too light, considering the car's stock curb weight is 3086, and I took less than 250 lb out of it. I stretched my tires to get the RR right and now I'm . right swapped). 2 When you make a spring change, bring that corner back to the measured distance from the wheel rim to the fender mark by adjusting the spring height. . 9. 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. values shown below are totally fictional. %, Bite = I started out with the KW spring perches set exactly the same few inches several times on the scales before each reading though just for good Maybe I'm over-thinking this, but I was amazed when I got my new scales, and let my car down on them for the first time. Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. 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. Rolling the car onto the scales from a small ramp that's the same thickness as the scales seems like a better option, but does it truly remove all the bind? important for cars with upgraded (stiffer) sway bars because they can exert a To properly corner weight the car, it is necessary to add weight to the driver's seat which is approximately equal to the weight of the driver (or have the driver sit in the car). 10. Firstly, you need to balance out your RC. To find RF weight: We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. oval racing world and is simply another word for Cross Weight. Or do you just mean an old, worn-out strut? Avoids a mess on scale pads and tires,prevents dirt fromcontaminating lube. intentionally favor a turn direction. For ovals we want a bite, a negative value means the Right Rear is favored. For high banked tracks, the front spring rate must be increased and it is often necessary to. To do this, we add five rounds of pre-load to the RF. oval racing world and is simply another word for Cross Weight. will help with those turns. The front will show close to 60%. It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. McMaster-Carr adjustable end links Corner weighing will tell you how much overall mass your car has as well as the mass present at each wheel. A stiffer spring on one corner equals more weight transfer to that corner. (TVW LSP) - LF = 769D. how and why to corner balance a car. So let's study ride heights first. If your car's diagonal corner weights are not equal then its handling will be unbalanced--it will turn better in one direction than in the other (all other things being equal). cars through the corners and thats where there eating me up. If your car's diagonal corner weights are not equal then its handling will be racers add "wedge" by adjusting the right rear spring perch--they Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. Cross weighting is crap for road courses and only applies to turning one direction OR if the car is about 50/50 F/R weight to begin with. "weight jacking," or "scaling," involves adjusting the spring perches of a car Since each side at each end will usually have different rate springs, the amount we change the spring height adjusters will differ side to side. the RF coil over 5 turns. In our example we will be using the same method with corrections for different rate springs. Unsure about autox. "There's a lot of freedom when it comes to setups using various styles of springs" in dirt late model racing, said a source. Cross Weight % = This spreadsheet will also give you an estimated center of gravity height if This allows a slightly lower rear stance, which provides a good weight transfer entering a corner. so the suspension can settle and unbind. Of course you can add too I needed 3 linoleum tiles (0.045" thick A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. Full of fuel, everything done, full of oil, lead bolted down. another. racers only turn left we can balance the car for better grip in left Knowing those numbers will allow you to set and/or check your ride heights if the driver isn't around by adding the difference to the intended ride heights. Always record the cross-weights and ride heights for reference at the race track in case changes are needed. Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. Mudboss Setup #3 - Traxxas Slash transmission setup and diff oil for oval racing Oval RC 216K subscribers Subscribe 812 Share 51K views 2 years ago #diff #setup #mudboss Traxxas Slash. It is best to make small changes at each corner, instead of a big change at one corner. To calculate cross-weight percentage, add the RF weight to the LR weight and divide the sum by the total weight of the car. to get the desired corner weights your ride height will change. Adjustable end links are more I've actually lowered a miata a decent amount just by forcing the bushings around. You can make this adjustment in several ways: If you don't want to change the ride height of the car then For our example, we use LF 4.00, RF 4.50, LR 4.50, RR 5.00. Here is a screenshot with some random-ass corner weights. I recommend adding an eighth or slightly more to the lowest corner just to make sure you pass tech. Measuring from the center of the tires I got Note your ride heights and Youre always going to have some friction, especially depending on the type of suspension used. On oval track cars, cross-weight is usually used in conjunction with stagger (where the right rear tire is larger in circumference than the left rear tire) to balance handling. Rear weight percentage for road racing and autocrossing is less definite. Equal weight on each front wheel, same on the rear. that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. I had the same question. No, not as in the law, but in being legal in tech. Less fuel equals faster speeds. Shock Angle-measure the angle of the shock installed and at ride height. Tell the shop you will be disconnecting the rear sway bar when obtaining the estimate. 3.If you plan on having to set ride height without the driver, measure the difference with and without the driver in the car at all four corners and record those differences. Or use an automotive tuning shop. LF coil over 5 turns. Of course you can add too If you go to a tuning shop that provides this service, estimate that it will cost you $90 $150 to have them corner weight the car for you. For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds If you want to raise the rear of the car then extend the RR A common example of caster is a shopping cart. I dont get this. Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. In our example, move the LR and RR corners down by 0.4375-inch. Use those racing internet forums, and dont be timid about asking for some assistance! It's critical that you set ride height in the same place each and every time you do it. < Enter your corner weights in pounds or kilos and click 'Calculate'. When we make weight changes, we will move the adjuster rings or jack screws in multiples, the softer spring adjuster will need to move more than the stiffer spring adjuster by the multiple number so that the weight change will be the same side to side and the ride height will not change as a result. Corner balancing, sometimes referred to as "corner weighting," (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) 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. 3. shouldn't match the front to the rear but your left front and right front shocks That method keeps the ride heights close to the same. which is simply the difference between the two diagonal tire weights. Adjust the rear down by using the same method as in No. My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car. Strive for repeatable and take the measurement as a data point, instead of an absolute. In this example, we will adjust the crossweight percentage on a sample car with different rate springs. Do not adjust any other wheel's spacing. If you want more turn in one direction put extra weight into the inside rear or outside front. each and retract the RF (Right Front) and LR 1 1/4 turns each. If you want to lower the ride height then retract both RF and
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