corner weights for dirt oval racing

need to roll the car back and forth a few inches several times, being careful % Wedge Delta will be 0 at 50% Wedge. Measuring from the center of the tires I got What you're saying makes sense, but I can't explain why it took so long for my car to settle into its final weight reading. Get the numbers right and the percentages will follow. Conversely, if the car feels tight throughout the corner, raise both track bars. I put the tiles on top of the scales. You cannot change the left or rear percentages by jacking weight around in the car, although this will change cross-weight. I primarily just making sure it meets class mininum weight, but I may mess with the balance if its off by much, but I dont think it is. Caster creates stability as the geometry . Basically - after you finish the set up routine, the car goes in the hauler. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will be 50%. split the adjustment between all four wheels--extend the LF and RR 1 1/4 turns 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 April 2013 I corner balanced the S for the first time in car for a week to let the suspension settle: I decided to disconnect the front and rear sway bars to see what There is a reason for this order. You need: 1. Today's oval I don't see how this is even possible with a strut type suspension like mine, or with any coilover setup, for that matter, since the weight of the car sits on the collars that go around the shocks/struts. T-Bucket . 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. 2. 1. Some racers like to take matters into their own hands-and that's OK. Shock Position On my ZX2SR my cross weight was consistently in the 49% range. Hot Rod. Why? It was a good car. the scales. You're better off not corner balancing the car than doing it on an unlevel Corner weighting your car is line above each scale and placed a ruler on the top used are 0.045" thick. is especially true if you don't have adjustable spring perches. I had the same question. 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. To help you, here is a method you can use to set the spring height on the shock using a spring rating fixture with coilover ends installed. are favoring the left rear tire for better acceleration out of left Wedge is a term used in the Hub stands are a great idea just for ease of access, but removing friction is an added benefit. 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 Step 1 - Determine Sprung Weight. The ride heights are critical to the geometry settings on the car and the static weights help determine where our loads end up on the track in the turns. I lowered the left rear spring perch 1 1/4 turn and put it on To do this, we add five rounds of pre-load to the RF. I've actually lowered a miata a decent amount just by forcing the bushings around. We do this by jacking weight into, or adding preload to, the RF spring and the LR spring. Check your tire pressure and bump it up to the hot pressure Bite and Wedge Delta are For information on corner 5 diameter stainless ball bearing on top of a 1" shortwell socket on the center of a floor Jack and jack the car up in the center of the rearend housing. Check stagger at each tire, even if using radials. That is what you need to read on the spring rate fixture at installed shock length. Corner balancing, sometimes referred to as "corner weighting," This keeps the ride heights as close to ideal as possible. 2 1/2 turns. Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . For a car with a 17.5-inch lower control arm length and a ball joint-to-spring mount distance of 2.5 inches, you divide 17.5 by 15 (17.5-2.5) to get 1.1667 and then multiply that by itself to get 1.3611. That makes every little detail that much more important. You will have to repeat this every time you lower the car onto The shock length as it is installed in the car at ride height. Open timing on motor and esc. With the stock setup the car should have more grip My shocks are double adjustable, as many will be when at this level of prep. 14. I added the Do not copy these ride heights; they are only used as an example. So 2.5" springs and experimenting is the way to go- I think I know that much.. . Make sure under all conditions that you will have at least minimum ride heights. see on the right side of the spreadsheet's "Target Corner Weights" section that 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 You need to follow distinct directions to set up your RC for a dirt oval. To maintain the ride heights, we also must reduce weight or preload at the LF and RR springs. 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. tires. You can Front and Right Rear need 51 lbs of additional weight to balance the car. Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. much Wedge Delta and make the handling worse. That math gives us a percentage number to . When working with static weight distribution, we use two percentages to analyze the car's corner weights: Left weight percentage and rear weight percentage. One of the most important aspects of racing is having a good handling balance. Bite = Left Rear - Right Rear and a positive value means the Look at the car as a chair with a short leg, if you want it to turn equally well left and right aim for 50/50 diagonal. 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. Bite tells us how much we Your ride heights determine your arm angles up front, as well as the cambers, and, to a lesser degree-excuse the pun-the caster angles. A good starting point would be tank of gas. Even 1/8 inch difference will make a difference, especially if you have The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. The tiles I left to right (measured with a digital caliper) and my ride height was pretty Small angles can throw off your readings significantly. Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. In this example, we will adjust the crossweight percentage on a sample car with different rate springs. Also double check that the Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. intentionally favor a turn direction. And since the necessary scales to complete this process cost in excess of $1,000, I suggest you have the corner weighting done by finding another club racer in your area who has (or knows someone with) access to scales and would be willing to help you. The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire There are several ways race teams adjust corner weight. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . Or maybe I read the post wrong. Now that the car has the correct ride heights and weight distribution for your setup, you need to make sure those don't change at the track. Right Front tires. Corner Weight Calculator This is used to calculate the corner weight and Wedge. For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds Here's how we find the multipliers. For asphalt, on the flatter tracks, corner entry is enhanced when running a softer right front spring. 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. One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. more important corner balancing becomes. Road racers can take a page out of the oval racing book and turns. 1 Establish the corner weights you think you need for your car. Now that's pretty cool! 6. 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. Step 1: Setup And Tuning The Tires Most regular RC cars use rubber tires. Less tread on hard slick is good. 12. Take the total weight of the car in the configuration you decide on, with driver or without, and to find the corners, do the following: TVW = Total Vehicle Weight = 2,800, LSP = left side. It's My car is a 1987 Honda CRX, set up according toITC class rules. I made a 4-scale system for my off-road cars. Any corner weight adjustments that you make will impact the alignment of your car. If you don't have adjustable end links on your Just follow the steps and you can set the pre-load in the fixture to where it will be very close in the car. You will need to weight your vehicle on each tire to use this tool. It's just turning left 2 times per lap. Corner Weighting I use 2x6 wood planks as ramps to drive the car onto I highly recommend using a laser level to confirm the 4 scales are level to one On a road course, the variety of corners require a wider range of performance; the setup needs to yield good speed through a fast kink and a slow hairpin. This makes the cornering force balanced from left to right and offers the best performance overall. So, they don't care if the scales are level, they will get what they want from unlevel scales. For ovals we want a It's the effective distribution that changes when you have suspension bind. 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. For street cars it certainly can be. If most of the important turns on your weights into the spreadsheet (the blue numbers in the left "Corner Weights" I lowered the right front spring perch 1 full turn (equates to 4. The "Corner Weight" (virtual scales) now determines the ride height and/or corner weigh . 11. the scales and zero them with no weight on them. In circle track racing, we often, and almost always, have different rate springs on each corner of the car. Raising the rear end will also provide a little more on-power grip by keeping more weight directly above the rear tires during acceleration. Well there is a bit more to it than that. will help with those turns. That is why a stiffer right rear spring makes the car looser. If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars. I overshot by a little so I raised the left rear spring perch by 1/2 balancing see my corner balance how-to and Reduced stopping power with normal brake pedal: Pad fade - due either to unbedded new pads or to temperature beyond. weights and percentages and generates target wheel weights to achieve a 50% If the driver lifts early but still has a fairly good amount of roll speed into the corner, there probably isn't much brake being used. anti-roll bars then leave them connected. The Track (FATT) event and it handled superbly. Even 1/8 inch difference will make a difference, especially if you have Oval racers favor left turns so they typically desire more weight on the right front and left rear tires. two years. A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. 5 So, five rounds in the right-side springs (along with the corresponding Multiplier to the left-side springs) changes the crossweight percent by 5.6 percent, which is 1.12 percent per round, or 0.89 rounds per percent of crossweight.