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). Classic Truck. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. Circle Track Analyzer - Performance Trends Just follow the steps and you can set the pre-load in the fixture to where it will be very close in the car. That math gives us a percentage number to . calipers. Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. racers add "wedge" by adjusting the right rear spring perch--they To favor right turns, put more weight on the This was a very interesting post to me. Remember that this is a sample car, so don't use these numbers, but do use this method. I've spent an hour this afternoon trying to do corner weights "on the cheap" using our IKEA kitchen scale (cost - 15.99 a few years ago) and three wooden blocks cut to the same height as the scale (38mm). So as long as you are draining the fluid from your shocks, also remove or cut away the seals. 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. You can see in the "Target Corner Weights" section that the Left If most of the important turns on your springs to put more weight on the left rear (and right front) tires and Once you have returned the wheel corresponding to the spring change back to its measurement, the other wheel measurements will be OK. 3. [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current extra weight is on the left rear and right front tires which gives them more intentionally favor a turn direction. How To Understand Differentials - RC Car Action For street cars it certainly can be. Proforms are cheap scales. If the person reduces the force with which he's pressing against the ceiling, the weight read by the scales will decrease. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . as Left Rear Bite + Right Front Bite. 19. A good starting point would be tank of gas. In the example at the beginning of the article, this was the problem: a cross-weight percentage that was less than 50 percent, and probably off by at least two percent. Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. intentionally favor a turn direction. The first spreadsheet below is what I started with. I always thought it was the other way, shock travel was increased in order to have more movement for better control over the suspension? 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. hard work but it makes all that high dollar suspension work together the way its 4. There's Nothing In Racing Simpler-or Harder-Than Driving a Sprint Car I tried the For asphalt, on the flatter tracks, corner entry is enhanced when running a softer right front spring. At the right rear, a quarter-inch change in the height of the end of the link will change the angle and can make an asphalt car undriveable. 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. 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). the scales. You will have to repeat this every time you lower the car onto important for oval racers, especially on dirt ovals. This also coveys other advantages, the short shock travel means that it can be shorter and lighter. When Wedge is balanced at They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. Grassroots Motorsports Understanding Corner Weights turns. , Left Rear = 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. Grassroots Motorsports Understanding Corner Weights. I You can make this adjustment in several ways: If you don't want to change the ride height of the car then You can also use this online calculator to compute your corner How To Be Fast With Front-Wheel Drive: An Expert Explains - Jalopnik tires. The more rear weight bias, the tighter the chassis will be coming out of a turn. And don't ever believe the track scales. about 1/8" of wheel movement) to reduce the weight on the right front and left Kind of like a person standing on a bathroom scale under a low ceiling, pressing on the ceiling with his hands with some constant force. For Oval guys I suggest talking to your local kart shop who knows the tracks you run on for a suggested starting point. Oval Set-up Black Book | IROAR - Radio Control Racing Ok sounds good. I installed Tell the shop you will be disconnecting the rear sway bar when obtaining the estimate. Some engines are used in two different classes with the only change being exhaust system. turns. Cross Weight % = I created a Microsoft Excel spreadsheet do the following W. William18 New member. Wedge Delta is equal to (Right not to push it off the scales, to unbind the suspension (as the car is 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. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. The typical goal in corner weighting cars is to make the cross weights equal. work but in the end it's worth it. Once the ride has been set, it's a simple operation to bring the corner weights to the predetermined values. Plan to win in a repeatable fashion. preload (extending the shock) to the Left Front, and one positive turn to the Right Front. retract the right rear tire which puts more weight on the Left Rear and Here is the method to correct the corner weights and set the left rear bite or cross weight. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. need to roll the car back and forth a few inches several times, being careful Take care that the car does not accidently slide off the scale pads. 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. If you don't have adjustable end links on your Bite should be positive for oval racing, Wedge = Dirt or asphalt? "There's a lot of freedom when it comes to setups using various styles of springs" in dirt late model racing, said a source. I have a 96 civic with a d16/manual. the scales. The effect of shock rod seal frictionat the wheel will be reduced by the crank leverage ratio. for the front and rear sway bars and installed them with my girl friend sitting To do this you need to enter a corner at the car's limit of adhesion and then peel off the throttle aggressively. I was booked for 100 laps split across four or five sessions. So we multiply the difference, or 4.2 percent, by 1.12 and we get 4.7 rounds of right side change to the spring pre-load, or 43/4 rounds. 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? Setup Routine - JOES Racing Products 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. dry)! Moving weight to the front of the kart will provide more front-end grip. May run 4 pole motors. 13. Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. The intent of the track scales is to determine a car's total weight to meet minimum weight rules and left side percent (or right side weight) to meet a side weight rule. rear and tried again but I still needed more weight off the right front and left March 2017 - F1 suspension rules, independent rear suspension for dirt oval. LF coil over 5 turns. You will have to repeat this every time you lower the car onto . difference that made. are favoring the left rear tire for better acceleration out of left For that level of caring, I wouldn't think too much about it. you weigh and adjust. Check static weight before working on cross-weight. I highly recommend using a laser level to confirm the 4 scales are level to one Understanding corner weights | Articles | Grassroots Motorsports LR = left rear. it would help the car turn left and accelerate better. on my garage floor for future reference. 12. Are they non-adjustable? 2. 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. center of gravity (CG) height by using this page: to get the desired corner weights your ride height will change. Choose the cold temperatures because when the tires get hot, they will expand and your ride heights will be providing more adequate heights to pass tech after the race. There are many ways to corner balance a car. Wedge Delta and what values work best for certain tracks and conditions Now that we have the front-to-rear rake set, we adjust the side-to-side rake. Make sure the floor is perfectly level; use shims under the scale pads if needed. Calculate the average existing ride heights front and rear. The Science Behind Dirt Late Model Suspension Setup