Scale Type: . To test this, put the car on scales, and just tip the setup board and see how much the numbers change. the RF coil over 5 turns. positive Bite and positive Wedge Delta. Bite tells us how much we 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 typically not concerned with bite and wedge delta because they usually The left side changes, of course, will be 4.75 times the multiplier for front or rear. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. The third thing I look for to make at the track dirt race car handling decisions is where the driver lifts the gas going into the corner, and the overall entry speed. 12. In oval racing you always run more weight on the LR. Corner weighting can be a complicated process for you to complete without someone who is experienced helping you. about 1/8" of wheel movement) to reduce the weight on the right front and left tires. The other two corners will lose weight. Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. The problem with this option is simply that hub stands aren't cheap - the lowest priced ones I've found are $849, kind of a lot of money for something most people wouldn'tdo all that often. At the time Honda was still favoring their home market I reckon. Upgrade fluid and/or cool. used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales It would just automatically settle. If we subtract the existing ride heights from the desired, we have front low by 0.0625-inch and the rear high by 0.4375-inch. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. In our example it is 18 degrees. and Left Rear. Strive for repeatable and take the measurement as a data point, instead of an absolute. Now, look into details about the matter. close to where I wanted it. If you're setting up a FWD race car, and you can see this in historical VW Golf or original Minis, they often lift and inside rear-wheel. weights: Corner Weight Calculator if If you align your car prior to doing the corner weights, it will be necessary to verify the alignment again after the corner weighting is completed. Right now I have (IIRC) 350 lb front and 200 lb rear springs (koni sport, eibach pro line, ST anti sway bars) . 35 psi hot tire pressure target . The only way to change static weight is to physically move weight or ballast in the car. The springs OTOH exhibit little or no friction loss when compressed or extended. Softer tire compound Right Rear Increase Right front and left rear Corner Weights Bicycling Left side tires lose contact with the racing surface More overall left side weight % First the tires. This is my 2001 S2000 with 1/2 tank gas, 216 I've had my cars corner balanced a lot, but never really looked into the science of it. 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 a nice, flat and level surface for the scales. With the stock setup the car should have more grip right swapped). 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. All 4 scales must be within 1/8 of an inch. Left Rear tire is carrying more weight so it will get more traction and Adding more rebound to the car will make the car more stable on rougher tracks. to measure your new springs and put the longest spring in the left front--this You can drop the front end slightly or raise the rear end for more aggressive turn-in. Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at But this is almost never the case. All 4 scales must be within 1/8 of an inch. 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. You've tried springs, shocks, different bars, neutralizing the anti-roll bar, and nothing seems to work. All rights reserved. Afterward you need to adjust the settings to the correct maneuvers. As the shopping cart is pushed forward the front wheels spin back and trail behind the caster line. Dirt Late Models. To add weight to a given corner, raise the ride height at that corner or lower the ride height at an adjacent corner. I used a laser level to project a horizontal To carry the wheel load, the spring must be compressed quite a bit. 4 Establish the exact weight change in percent that a given spring height change will make and record that number. Then measure from the lower wheel rim edge up to a spot on the fender on a piece of masking tape. Your results might be different from mine. turns. suspension changes to track your progress. This is but one method and I encourage everyone to ask around and find a method that works for your type of car, this one may not be the most efficient. Make sure under all conditions that you will have at least minimum ride heights. 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. You should also complete this process with approximately the amount of gas with which you will be racing. Jun 7, 2018 #5 . racers add "wedge" by adjusting the right rear spring perch--they Once you have returned the wheel corresponding to the spring change back to its measurement, the other wheel measurements will be OK. 3. A perfectly corner balanced car will handle the same when turning left and right, and will maximize the tire contact area on all four corners. Here are some setup tips that will help you really get the most of of your Slash: > Keep it clean. and measured between the outside bottom rim edge is 67.75" front and 69.875" Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. I overshot by a little so I raised the left rear spring perch by 1/2 Get the numbers right and the percentages will follow. I had to do this with my truck. I made a 4-scale system for my off-road cars. If one leg is longer or shorter than the others, the table will rock and thus be unstable. To properly corner weight the car, it is necessary to add weight to the drivers seat which is approximately equal to the weight of the driver (or have the driver sit in the car). Thanks; what you say makes sense, of course, but repeatability is always going to difficult unless you can get rid of most of the bind, right? track are left turns then having more weight on the Right Front and Left Rear While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. If you have uneven mass on your wheels then your tyres will all have different levels of grip which can lead to an unpredictable car on circuit and make it corner faster in one direction than the other. Would be interesting to see how close to ideal I got it though, given how well it handles already. Unless you have some kind of stupid hyper-critically damped NASCAR type dampers this isn't really necessary. Or use an automotive tuning shop. after this adjustment we still need to add 39lbs to the Left Front and The spreadsheet's second page has a good article that goes into more detail of But in a right turn, the opposite occurs and the handling is worse. If the car feels loose on corner entry, lower the left track bar. can help us get our setup right with less testing. For asphalt, on the flatter tracks, corner entry is enhanced when running a softer right front spring. important for oval racers, especially on dirt ovals. That seem like a lot. 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. not to push it off the scales, to unbind the suspension (as the car is This approach is commonly used in oval track racing. I use 2x6 wood planks as ramps to drive the car onto If we are running twice as stiff a RR spring as the LR, we would need to change the height of the LR spring twice as much as the RR spring so that we don't affect the ride height as we hunt for the correct or desired weight distribution. Same with go-karts with solid rear axles, they'll lift. In our example, move the LR and RR corners down by 0.4375-inch. Front + Left Rear) - (Left Front + Right Rear) and tells us how much It's 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. "This is called chassis pre-load. Oval And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm. Changing the ride height at any corner will change the cross-weight percentage. The less fuel in the tank the tighter the chassis will become. Toe inn a 1/4 inch. Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. Get the rear percentage as close to the manufacturer's specs as possible. the driver seat and reconnect them so there's no preload on them. in the driver's seat to load the suspension. Do this by making equal changes to the adjusters on each side. RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval, GFRP, Custom Works, Purpose Built) - YouTube 0:00 / 43:10 Dirt Oval Setup & Tuning Tutorials RC Dirt Oval Basic Setup &. The tiles & salt seemed to help because the weight never We had a good Miataset up for ST. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will be 50%. Wheel Load-We have already determined the wheel load we desire in No. Rear weight percentage for road racing and autocrossing is less definite. it would help the car turn left and accelerate better. scales are connected properly--you can really screw up your suspension settings right swapped). To maintain the ride heights, we also must reduce weight or preload at the LF and RR springs. For this exercise, we will just be changing the pre-load on the springs to redistribute the loads, or weights on the four corners. 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. If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. % 50% is optimal, Wedge = We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. Plan to win in a repeatable fashion. Measure control arm angles after each change. To favor right turns, put more weight on the works well. lot of force to the suspension. This was a very interesting post to me. turns. coil over 5 turns. If you want to lower the rear of the car then retract the LR A 50% Cross Weight will yield a balanced handling car, one CG Height Calculator, Cross Weight % = Always try to start with the track bars first. Wedge Delta is equal to (Right 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. (CG) height by using this online calculator: CG Height Small angles can throw off your readings significantly. To do this, we add five rounds of pre-load to the RF. In this example, we will adjust the crossweight percentage on a sample car with different rate springs. Bite = Left Rear - Right Rear and a positive value means the If you don't have adjustable end links on your 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. You need a nice, flat and level surface for the scales. 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. Then the car will move more easily from one setting to another. A. You can Less tread on hard slick is good. April 2017 -Bracketing settings, 4WD high speed pavement vehicle. Check stagger at each tire, even if using radials. Smaller will scrub less speed of if your not sideway threw the corner. For that level of caring, I wouldn't think too much about it. One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. 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? as Left Rear Bite + Right Front Bite. Be sure to have the weight of the driver in the seat. When a NASCAR crewchief says he's "adding wedge", This allows a slightly lower rear stance, which provides a good weight transfer entering a corner. then set corner weights and cross weight. 2. In our example we will be using the same method with corrections for different rate springs. I < Enter your corner weights in pounds or kilos and click 'Calculate'. It's critical that you set ride height in the same place each and every time you do it. . In our example, the front average is 4.25 and the rear is 4.75. For ovals we want a If most of the important turns on your If it slows to 100rpm, the outside wheel will spin at 300rpm. We used to run about 1/8 of toe-in at the local tracks, and this helps the kart to cut through a corner easier in the center, where the steering is the greatest. Understanding corner weights. pad capacity. Front + Left Rear) - (Left Front + Right Rear) and tells us how much 2. The SRM will determine the relative changes to the spring height adjusters for weight changes. It still pays to be thoughtful about weight placement fore and aft in your car. For our example we use: LF 200, RF 250 - 250 200 = 1.25 multiplier for the front. Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. 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. 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). track are left turns then having more weight on the Right Front and Left Rear upgrading our street stock suspension part 2 the rear end. 57.5" front and 59.625" rear. Unsure about autox. surface. 13. Bite and Wedge Delta are The following are screen shots from the on each wheel to speed shock adjustment. that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. can help us get our setup right with less testing. be appropriate such as making small adjustments to all 4 wheels--add preload to Because we desire 52 percent, we will need to increase the crossweight percent. Open timing on motor and esc. 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. Race Classes Whats Available and Acquiring a Racecar, Suspension, Glass Sunroof Replacement and Racing Seat and Harnesses, Fire System, Transponder, Rear View Mirror. Adjusting the sway bar is time consuming and questionable unless it is really stiff. spread when the car is lowered onto the scales. They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. I created a Microsoft Excel spreadsheet do the following The design has the engine and transmission scooched over to the drivers side so the drivers side weighs more empty. Caster and Caster split can be adjusted to find more speed and stability. Step 1 - Determine Sprung Weight. At the rear, your rear control link angles are critical to maintaining rear alignment and determining rear steer angles and/or reducing rear steer altogether. At least for road racing. Guess I have to try it. In almost all cases, the loss of cornering performance in one direction is greater than the gain in the other direction. This gets very tedious, given the number of iterations it typically takes to get the corner weights right. cars through the corners and thats where there eating me up.

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