suspension). rod movement from the wheel to the coilovermovement. Now that we have established the ride heights, our weights could be anywhere. How would you makesomething like that? Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. 12. Setting static weight distribution and adjusting cross-weight percentage is one way to assure good handling. Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. Step 1: Setup And Tuning The Tires Most regular RC cars use rubber tires. after this adjustment we still need to add 39lbs to the Left Front and 12. anti-roll bars then leave them connected. . rear. the scales and zero them with no weight on them. They are never level. If the car understeers or oversteers in only one direction, check the cross-weight percentage. Or do you just mean an old, worn-out strut? track are left turns then having more weight on the Right Front and Left Rear I recommend you start with your car at your desired ride Wedge Delta can also be thought of If the car feels loose on corner entry, lower the left track bar. When Wedge is balanced at In order to perform the set up routine the car needs to be completely ready to race. One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. Don't just blindly cross weight it thinking it's the "right" way. what he means is he's adding weight to the left rear and right front As for setting the left side and right side equal, I understandthe reason why it might be best, but hard for me to picture how to adjust it. Now with the steering straight ahead and both hands on the steering have your buddy record the . (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4 things being equal). TVW CWP FWP or, 2,800 0.52 0.51 = 685B. Splash = 2-3 gallons, 1/2 can = 5-6 gallons, 1 can = 11-12 gallons, 1 1/2 cans = 17-18 gallons, 2 cans = full tank. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. 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. Your results might be different from mine. 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. To find RR weight: Then move components like the battery or fuel cell. Rear weight percentage for road racing and autocrossing is less definite. tires. right swapped). Corner weighting your car is Are they non-adjustable? what he means is he's adding weight to the left rear and right front does not change when a driver is added. Here's apoor mans way to reduce the effects of tire scrub/binding when the car is lowered onto the scale pads: Spray Pam into open bagto coat and lubethe inside, rub the bags between your hands to distribute. To keep things clear I call this added weight Wedge Delta 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. That is equal to 7/8 turn of the adjuster. Right Front weight: Left Rear weight: 12. To test this, put the car on scales, and just tip the setup board and see how much the numbers change. The driver is optional based on No. Your car may be designed to run different ride heights than these. You need a nice, flat and level surface for the scales. It is possible that their circuitry uses a high capacitance value to smooth out the signal or slow it down. scales are connected properly--you can really screw up your suspension settings The LF needs to go up 0.3125 and the RF needs to go down the same amount. I use 2x6 wood planks as ramps to drive the car onto 1. Maybe there's some sort of bind in the scales. (TVW FWP) - RF = 743C. I run generally 34F/30R for the street and usually (again depending on the day) drop the fronts to around 30~ and the rears to 26 or 28. scales are connected properly--you can really screw up your suspension settings Race Tires: Are You Ready to Spend Some Money? Motion Ratio of the lower control arm. Once the corner balance is complete put someone in 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. The tiles I Do youhave recommendations for such corner weight percentages? Toe inn a 1/4 inch. 50% then Wedge Delta will be 0. Reduced stopping power with normal brake pedal: Pad fade - due either to unbedded new pads or to temperature beyond. %Right Weight = Or maybe I read the post wrong. Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. It will let you predict and understand the effects that various modifications have on handling, performance and lap times. In other words, to make this method work, wouldn't you really have to drive the car around, preferably going over a few pretty serious bumps, before driving onto the ramps? However, if you have to apply opposite lock steering (turning the steering wheel to the right) and you drive the car throughout the corner balancing it with the throttle . 2. intentionally favor a turn direction. Bite = Left Rear - Right Rear and a positive value means the But this doesn't explain why the Vette's readings came in so well, while I had to jump up and down on my door sills quite a bit before my car's weight stabilized at its expected value. Note your ride heights and weights and percentages and generates target wheel weights to achieve a 50% They are not too suitable for racing and oval dirt cars. For street cars it certainly can be. April 2017 -Bracketing settings, 4WD high speed pavement vehicle. 1 Establish the corner weights you think you need for your car. 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. Oval Track. Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. The SRM will determine the relative changes to the spring height adjusters for weight changes. You're better off not corner balancing the car than doing it on an unlevel Get the numbers right and the percentages will follow. your scales. As the shopping cart is pushed forward the front wheels spin back and trail behind the caster line. Brake pads badly taper worn - replace. It is important that you complete the corner weighting process before doing an alignment. Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. Shock Position 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. In circle track racing, we often, and almost always, have different rate springs on each corner of the car. Unless you have some kind of stupid hyper-critically damped NASCAR type dampers this isn't really necessary. This spreadsheet will also give you an estimated center of gravity height if 4. May 2017 -Dirt late model pinning RF & heavy axle tube. 57.5" front and 59.625" rear. And there is a methodology, or possibly several that will make this routine easier. A jumbo ziploc bag prevents lube from escaping when not in use. them for the corner balance. should have their spring perches in the same spot and your left rear and right While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. To truly optimize your shocks, your overall suspension setup must be right, including ride height, camber, caster, toe, and the correct spring rates. Even 1/8 inch difference will make a difference, especially if you have Oval racers favor left turns so they typically desire more weight Here is what you do. Less tread on hard slick is good. 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. Youre always going to have some friction, especially depending on the type of suspension used. Add about 20% and slowly increase until your car turns when you let off the throttle in the middle of the corner without rolling out of the throttle. 45. To find LF weight: You need to follow distinct directions to set up your RC for a dirt oval. turns. A. unbalanced--it will turn better in one direction than in the other (all other These weights are in ready to race form (including driver on board). can help us get our setup right with less testing. However, most importantly you need to take care of the handling. which is simply the difference between the two diagonal tire weights. need to roll the car back and forth a few inches several times, being careful If you lower the ride height at a given corner, that corner will lose weight as will the diagonally opposite corner. The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. TVW - (RF + LF + LR) = 603. LF coil over 5 turns. Before putting your car on the scales you need to power up it would help the car turn left and accelerate better. to get a balanced diagonal weight on the tires. W. William18 New member. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . stiff springs on your coil overs. The roll center is an imaginary point around which the rear of the race car rolls. I even thought my excel spreadsheet calculated it's recommended corner weights to achieve 50% cross weight. cars through the corners and thats where there eating me up. All 4 scales must be within 1/8 of an inch. racers add "wedge" by adjusting the right rear spring perch--they These are your current calculated weights: Left Weight = typically not concerned with bite and wedge delta because they usually tiles) on the left front and 1 on the left rear to level the scales. Keep in mind the stiffer your springs the So LF/LR = RF/RR is what you shoot for. I usually mark an even inch and write that inch number on the tape. < Enter your corner weights in pounds or kilos and click 'Calculate'. Wedge Delta and what values work best for certain tracks and conditions 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 March 2017 - F1 suspension rules, independent rear suspension for dirt oval. oval racing world and is simply another word for Cross Weight. I plugged in a bunch of numbers into my calculator and it all checks out. The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. how and why to corner balance a car. Basically - after you finish the set up routine, the car goes in the hauler. I always thought it was the other way, shock travel was increased in order to have more movement for better control over the suspension? . left to right. If the car feels loose throughout the corner, lower both track bars evenly. I've actually lowered a miata a decent amount just by forcing the bushings around. 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). Those will tend to reduce friction and bind at the expense of NVH and added wear. To get good accuracy easily make sure you get the low hanging fruit first like removing the friction between the tires and the scales so there is no bind. much Wedge Delta and make the handling worse. 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. hard work but it makes all that high dollar suspension work together the way its Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. However, you can choose to use them. Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. Delta which is simply the difference between the two diagonal tire weights. Raising the rear end will also provide a little more on-power grip by keeping more weight directly above the rear tires during acceleration. to get them exactly level. It has to, it's just the laws of physics. shocks set to same length left to right (front to rear will be different). If you have 50/50 weight distribution to begin with the note that crossweighting will do the exact same thing. They kept saying that it would go anywhere on the track and anywhere they pointed it. on my garage floor for future reference. Corner_Balance.zip Excel spreadsheet. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. another. 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). The important thing to remember is that the laws of physics are the same whether you are racing on an oval or a it would help the car turn left and accelerate better. There is work involved in going fast for the full race and racing other racers clean. spring perch so I left my jacks in place between lifts and only put two lug nuts Our current setup is as follows - 270 lbs Car & Driver Cross Weight = 48% Rear Weight = 61% Left Side Weight = 51% LF = 56 lbs RF = 48 lbs LR = 82 lbs RR = 83 lbs Ah, OK, thanks for the clarification. All rights reserved. to measure your new springs and put the longest spring in the left front--this A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. racers discovered they could insert an actual wedge into the left rear You can also use this online calculator to compute your corner 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. Record each spring rate. If you shocks are working normally they are not worth worrying about. With the stock setup the car should have more grip supposed to. then leave them connected. 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. I stretched my tires to get the RR right and now I'm . right swapped). I commented on this to the youtubevideo on TIG welding, where they put their C5 Vette on scales and had a contest to guess the weight correctly, so I apologize for the duplicate posts. Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced. That method keeps the ride heights close to the same. 2. scales. decided to try 5 turns total of spring perch movement to balance the car. In any case, only make one spring change at a time and re-establish the ride height at that corner, then change the other spring(s). lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. You can also use this technique when adjusting your alignment and traction or bite in left turns. One of the most important aspects of racing is having a good handling balance. For pure race cars this isnt a consideration.
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