Since oval Lowering the cross weight does the opposite of raising the cross weight. We now take five rounds out of the RR and add five rounds times the rear multiplier, or 2.0 5 = 10 rounds to the LR. you raise the rear of the car 10 inches or more and re-weigh it. When you adjust your coil overs Changing the ride height at any corner will change the cross-weight percentage. More wedge means that the car will likely understeer more in a left turn. In my situation, I have a lift, and I'd like to simply drop my car onto the scales, but it seems like that's the worst option as far as removing friction and bind. The typical goal in corner weighting cars is to make the cross weights equal. To increase rear weight, move weight as far back as possible. Timely refresher that leaves me with a question Ive had for the last couple years that I have not found an answer to in hours of searching. The crossweight percent will have changed to, say 55.4 percent. Wedge is a term used in the The spreadsheet's second page has a good article that goes into more detail of All of these measurements are widened by the retract the right rear tire which puts more weight on the Left Rear and On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. tires. Minimizing the hysteresis is good, but it also minimizes the shock/spring contribution to effective 'at the wheel' unprung weight (mass). You can also estimate your car's 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. Proforms are cheap scales. Once you get the car up on the scales you'll Once the corner balance is complete put someone in of the scale to take a reading. Make small changes at the track, and make only one change at a time. I had to do this with my truck. I see disconnecting the sway bar, and how to do it, but disconnect the shocks? Keeping track of Bite and Grassroots Motorsports Understanding Corner Weights. Brake pedal is soft, spongy and/or long before the car is run: Air in the system - bleed brakes. intentionally favor a turn direction. 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. Once you have installed your coil-over suspension, mount the rims with the tires you will be racing with, and complete all other items that could impact the vehicles weight and placement of that weight. You should also complete this process with approximately the amount of gas with which you will be racing. racers only turn left we can balance the car for better grip in left I Currently, dirt car racing involves a left-hand weight measurement of 53.5-55, along with a wedge between 75-125 pounds. Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced. then leave them connected. I will say that if I'm starting on a fresh setup, or the car has been lowered, or I find myself making massive spring perch changes, then I will loosen all of the suspension bolts so that the bushings can relax and find their new happy place. scales. I Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . When dealing with advanced suspension tuning, some people may adjust the corner weights in a manner to impact the way the car handles based on the tracks layout. the front ramps then jack up the rear and lower it onto the rear scales. So 2.5" springs and experimenting is the way to go- I think I know that much.. . More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. It puts power down better, and any decent FWD car will be carrying a wheel in the air around a turn anyway, so by default the outside rear gets 100% weight transfer when it's being asked to turn anyway. The Track (FATT) event and it handled superbly. 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. 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). I don't like the lower weight ratings and plastic scale pads of proform. Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. In circle track racing, we often, and almost always, have different rate springs on each corner of the car. The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. Still, it is a worthwhile goal to strive for 50 percent left-side weight. These tell us all we need to know about the setup relative to the weight distribution. Interested in hearing peoples' opinions and (preferably) experiences. Make sure all of the weights are in the car including fuel, oil, battery, cooling water, hood, and so on, or weights that will simulate those. Wheel offsets are very important. Wheelbase: 9.5" min, 11.5" max Maximum width: 10.250" Minimum weight: 57.0 oz All cars must have 4-wheel independent suspension, single speed transmissions only. In order to perform the set up routine the car needs to be completely ready to race. Positive Caster is created when the caster line lands forward of the contact patch. We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. 2. I just back all of the damping off totally. Astrut with its innards removed? [ 1] In circle track racing, the use of the term "crossweight" gives us an indication of the weight distribution on the four tires. Get the numbers right and the percentages will follow. oval racing world and is simply another word for Cross Weight. By changing the weight distribution on the car, you affect the way your car will behave when cornering. Use those racing internet forums, and dont be timid about asking for some assistance! As long as the tires have near "1 to 1 traction" with the ground, you should set up your race car like an asphalt car (see the Chassis Set-up At The Rear For Cornering page). It's critical that you set ride height in the same place each and every time you do it. your scales. 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. Your results might be different from mine. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . box in the "Ride Height" section of each spreadsheet. need to roll the car back and forth a few inches several times, being careful The overall effect is much like having no shock in the equation. 3) Reverse stagger: The opposite of stagger when your left side tires are . W. William18 New member. Then measure from the lower wheel rim edge up to a spot on the fender on a piece of masking tape. difficult to position all 4 scales so you can just drive up on all of them at It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. Beyond that, if your bushingsand other parts bind on the scales then they're also going to bind out on the road, so who cares? You can also put two linoleum tiles with salt between them on Some racers like to take matters into their own hands-and that's OK. LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. work but in the end it's worth it. intentionally favor a turn direction. Adjust the cross weight for more extreme conditions or different circumstances. You can change ride heights later on, but remember that your front moment center geometry will change and your rear geometry will also change, including link angles and pinion and third link angles, as well as rear alignment in some cases. few inches several times on the scales before each reading though just for good If you get the car neutral in left turns, it oversteers in right turns. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. Do these percentages apply for front wheel drive cars? very close to ideal. Wheel offsets can make a huge difference in fine tuning the chassis which will allow the driver to find a good racing line on the track. left to right. I dont get this. turns. To carry the wheel load, the spring must be compressed quite a bit. to balance your car in one big step. These are your current calculated weights: Total Weight = Front Weight = % Left Weight = % Right Weight = % Rear Weight = % Cross Weight = 50% is optimal Bite = Bite should be positive for oval racing Wedge = % Wedge Delta should be positive for oval racing If the car feels loose throughout the corner, lower both track bars evenly. 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. are favoring the left rear tire for better acceleration out of left weights into the spreadsheet (the blue numbers in the left "Corner Weights" If you want to lower the front of the car then retract only First the tires. Of course you can add too Check your tire pressure and bump it up to the hot pressure I noticed that the spreadsheet I'm using on the left of the picturesets my "target corner weights" to less than 50% (49.6%),why is that? For the teams that are running very soft front coilover springs, you will have a very difficult time moving the adjustment ring with your shocks in the car because of the high amount of pre-load on the spring. The total spring perch There are legal issues too at the front. If you do have adjustable end Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or . To find RF weight: to get them exactly level. Doing the multiplication to square that number, we get 1.1056. retract the right rear tire which puts more weight on the Left Rear and split the adjustment between all four wheels--extend the LF and RR 1 1/4 turns Find the difference from the desired average ride heights. Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. for the front and rear sway bars and installed them with my girl friend sitting TVW - (RF + LF + LR) = 603. pad capacity. My big stumbling block on this subject is how to get accurate readings by removing all the friction/bind from the tires, sway bars, bushings, etc. Always try to start with the track bars first. A jumbo ziploc bag prevents lube from escaping when not in use. I usually mark an even inch and write that inch number on the tape. bite, a negative value means the Right Rear is favored. Crossweight is of no concern to the track officials. that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. You can make this adjustment in several ways: If you don't want to change the ride height of the car then 11. Left Front weight: That seem like a lot. A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. The car is built on a jig for a particular ride height layout. Now that we understand the value in maintaining ride heights, just what heights do we want? Left Front and Right Rear but you'll have to test to find out what works best. If you want to raise the front of the car then extend only the balancing see my corner balance how-to and Calculate the spring rate multiples. Calculate the average front and rear desired ride heights. to get a balanced diagonal weight on the tires. Lay the bag flat onto the scale pad, partially open to vent, lower the car into the bag. rear should be the same. Ah, OK, thanks for the clarification. Right handers vs left handers feel quite a bit different-I run out of suspension on right handers much more often, and on left handers the car loves having me hanging out over the inside of the contact patches working the corner. If you have 50/50 weight distribution to begin with the note that crossweighting will do the exact same thing. In the above example, to go from 52 percent to 50 percent cross-weight, try lowering the right front and the left rear one-half turn on the weight jack bolt or spring perch while raising the left front and right rear the same amount. Wedge Delta and what values work best for certain tracks and conditions If you want to raise the ride height then extend both LF and RR coil overs On an average workbench/table that's close to level, it's probably < 3g difference per corner, which is within the tolerance of stiction / binding in a touring car. We do this by jacking weight into, or adding preload to, the RF spring and the LR spring. Disconnect and adjust later. This means the driver should be in the car, all fluids topped up, and the fuel load should be such that the car makes your minimum weight rule at the designated time-usually after a race. links then disconnect them for the corner balance. The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire shifted by more than 1 pound after rolling the car on the scales. That makes every little detail that much more important. It's the effective distribution that changes when you have suspension bind. They are not too suitable for racing and oval dirt cars. close to where I wanted it. We delve deeper into race suspension tuning basics here. So, we are not reinventing the wheel here, just refining the process. 1. the RF coil over 5 turns. So if you have 60% on the front , you should have 30% on each front wheel. 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. I stretched my tires to get the RR right and now I'm . Bearings, like sealed roller bearings,solid bushings, or spherical joints. Before putting your car on the scales you need to power up shocks set to same length left to right (front to rear will be different). With the stock setup the car should have more grip We run a fixed chassis meaning no suspension and the Briggs lo206 so we aren't sliding it around the corner but tracking almost like an asphalt Kart. Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. It is a critical set-up tool. . Hot Rod. used linoleum tiles to shim two of my scales to get them all level. When looking at corner weighting, the cross weight (diagonal weight) is the most important component. suspension). In our example we will be using the same method with corrections for different rate springs. We use our multiplier to move each adjuster so that the preload changes are equal and the ride height will remain close to the same. Once you get the car up on the scales you'll It will let you predict and understand the effects that various modifications have on handling, performance and lap times. racers discovered they could insert an actual wedge into the left rear Because we desire 52 percent, we will need to increase the crossweight percent. Always record the cross-weights and ride heights for reference at the race track in case changes are needed. adjustment so I have a history of each adjustment. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. extra weight is on the left rear and right front tires which gives them more The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. see on the right side of the spreadsheet's "Target Corner Weights" section that You need to follow distinct directions to set up your RC for a dirt oval. . bite, a negative value means the Right Rear is favored. Unsure about autox. Exhaust/Headers, Limited Slip Differentials and Fuel Injectors, Engine Dyno Tuning, Racing Wheels and Air Dam/Splitters, The Costs of Racing Personal Safety Equipment & the Racecar, Brake Pads, Fluid Routine Maintenance Timeline, Dealing with Cosmetic Bodywork: Painting the Racecar Interior.

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