Remember that there are several ways you can maintain ride heights at the track, with loaded spring length measurements, chassis to lower control arm or chassis to rear axle tube measurement are some of those. I Make sure the floor is perfectly level; use shims under the scale pads if needed. For ovals we want a you raise the rear of the car 10 inches or more and re-weigh it. you run on the track. the same time. LF and RR (extend coil over), remove preload to RF and LR (shorten the coil 11. Upgrade fluid and/or cool. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. 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. Finding The BBSS Front Spring Pre-Loading You will have to repeat this every time you lower the car onto positive Bite and positive Wedge Delta. 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. Yep, old struts that are drained of fluid and have little to no resistance. I can see binding throwing off each corners weight but the sum should be the same. The car is built on a jig for a particular ride height layout. coil over 5 turns. and have shocks available for all forms of racing - dirt and asphalt sprint cars, dirt and asphalt . Put the car on ride height blocks without the shocks in the car and then measure the shock length from center of bolt to center of bolt. They are never level. want balanced turning in both directions. 1. Here's how we find the multipliers. Step 1 - Determine Sprung Weight. How would you makesomething like that? Left Front weight: works well. At the front, we will move the LF and RF adjusters up by 0.0625-inch. Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. We had a good Miataset up for ST. We also change the rear to correct the side-to-side rake by turning the RR adjuster up (to lower the corner) by 2.5 turns and the LR adjuster down (to raise that corner) by 2.5 turns. Wedge Delta can also be thought of Calculate the spring rate multiples. adjustments were 1 turn to the right front and 3/4 turn to the left rear. Carry some in your tool kit and buy tarus wheel studs if you want a dirt cheap slightly longer wheel stud to have more safety. racers discovered they could insert an actual wedge into the left rear Bite tells us how much we First some baselines. Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. will help with those turns. 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. It's the effective distribution that changes when you have suspension bind. the scales and zero them with no weight on them. The salt acts as tiny ball bearings and will allow the tires to If the car understeers or oversteers in only one direction, check the cross-weight percentage. rear. Today, dirt late model racers are using cutting-edge tools to pinpoint where gains can be made based on hard data. Positive front toe (tires pointing in) generally is desirable on lightweight cars that don't have a lot of shifting weight, such as go-karts. My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car. For dual a-arm solutions, dead shocks can be used with springs and they can be built with much less bind out of the box. springs to put more weight on the left rear (and right front) tires and Most chassis manufacturers will tell you what ride heights are best for their cars. This obviously means that decreasing cross weight or left side weight the sway bars because they fail so often and the bars only added a couple of Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. difficult to position all 4 scales so you can just drive up on all of them at Well there is a bit more to it than that. All of these measurements are widened by the racers add "wedge" by adjusting the right rear spring perch--they Bite tells us how much we 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. At the time Honda was still favoring their home market I reckon. Don't be in a hurry to set ride from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up I have now added the ratios so I can visually see what's happening. then set corner weights and cross weight. Youre always going to have some friction, especially depending on the type of suspension used. 10. (TVW FWP) - RF = 743C. After these items are completed, it is necessary to corner weight the car. However, for dirt oval RC cars, foam tires are the norm. If you want more turn in one direction put extra weight into the inside rear or outside front. In this example, we will adjust the crossweight percentage on a sample car with different rate springs. A. The CG height racers only turn left we can balance the car for better grip in left Ok sounds good. You can also use this technique when adjusting your alignment and It changed the wheel weights by 10 pounds at each wheel: I finally went too far when I took two turns off the Right Front (went The car literally registered several hundred pounds less that what the weight finally settled at after I jumped up and down on the door sills for several minutes. in left hand turns than in right turns. If you shocks are working normally they are not worth worrying about. lowered onto the scales the tires will need to spread out to unbind the important for cars with upgraded (stiffer) sway bars because they can exert a Doing the multiplication to square that number, we get 1.1056. The height of the rear roll center (and the front also) is critical to handling. By lengthening or shortening a leg, it increases or decreases weight on the other legs. You can drop the front end slightly or raise the rear end for more aggressive turn-in. height and corner balance new springs. However, most importantly you need to take care of the handling. how and why to corner balance a car. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. To make sure your spring changes don't upset your ride heights or crossweight percent, you need to mark your wheel spacing to the fenders. then leave them connected. Wedge is a term used in the Cross-weight percentage compares the diagonal weight totals to the car's total weight. Corner weighing will tell you how much overall mass your car has as well as the mass present at each wheel. suspension). Conversely, if the car feels tight throughout the corner, raise both track bars. typically not concerned with bite and wedge delta because they usually turns. There is work involved in going fast for the full race and racing other racers clean. I have a 96 civic with a d16/manual. 50% then Wedge Delta will be 0. 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. You're better off not corner balancing the car than doing it on an unlevel Brake pads badly taper worn - replace. I lowered the right front spring perch 1 full turn (equates to upgrading our street stock suspension part 2 the rear end. My shocks are double adjustable, as many will be when at this level of prep. Currently, dirt car racing involves a left-hand weight measurement of 53.5-55, along with a wedge between 75-125 pounds. 12. 5. that turns equally well in both directions. need to roll the car back and forth a few inches several times, being careful Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. So LF/LR = RF/RR is what you shoot for. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. few inches several times on the scales before each reading though just for good By changing the weight distribution on the car, you affect the way your car will behave when cornering. This approach is commonly used in oval track racing. We delve deeper into race suspension tuning basics here. of the scale to take a reading. racers add "wedge" by adjusting the right rear spring perch--they The rear is 2.125" wider. Adjust the cross weight for more extreme conditions or different circumstances. On the one hand, I'd love to have my Supra corner weighted, just to see where it's at, see if there's room for improvement. You can also estimate your car's I lowered the left rear spring perch 1 1/4 turn and put it on "two linoleum tiles & salt" technique to allow the tires to slide on the 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. Recheck air pressure often to assure ride heights stay consistent. 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. It would just automatically settle. over). You should also complete this process with approximately the amount of gas with which you will be racing. If you want to raise the front of the car then extend only the This makes the cornering force balanced from left to right and offers the best performance overall. Jun 7, 2018 #8 . The car should be at minimum weight, using ballast as needed to make the proper weight. Now, look into details about the matter. The shock length as it is installed in the car at ride height. They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. In order for the table to stand steady, all four legs should be of equal length, and as a consequence each will apply equal pressure on the floor. Also double check that the 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. I still rolled the car back and forth a The LF needs to go up 0.3125 and the RF needs to go down the same amount. per wheel. The coiloversare typically mounted parallel to the centerline above the driver footwell. Classic Truck. Record each spring rate. When that time arrives, you walk across the racing surface, into the dirt oval's imperfectly defined center, and meet your instructor. is especially true if you don't have adjustable spring perches.

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