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Toe inn a 1/4 inch. A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. Firstly, you need to balance out your RC. I dropped my integra off at edge to have this done today. A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. left to right. 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 You're better off not corner balancing the car than doing it on an unlevel You would be amazed at how much bushing twist can contribute on your suspension. coil over 5 turns. No, not as in the law, but in being legal in tech. Since oval These tell us all we need to know about the setup relative to the weight distribution. hard work but it makes all that high dollar suspension work together the way its . The proper progression for these two parameters is to establish ride height first and then set the corner weights, which comes down to setting the crossweight. used linoleum tiles to shim two of my scales to get them all level. This approach is commonly used in oval track racing. Once you get the car up on the scales you'll Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. This keeps the ride heights as close to ideal as possible. springs settled over the first 3 months. LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. For ovals we want a I needed 3 linoleum tiles (0.045" thick For our example we have LF 3.625, RF 4.75, LR 4.625, RR 5.75. You can lower the cross weight to help on tacky tracks. You can also use this technique when adjusting your alignment and from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up When you adjust your coil overs 1. How to Adjust iRacing Sprint Car Cross Weight AKA Wedge Strive for repeatable and take the measurement as a data point, instead of an absolute. Positive Caster is created when the caster line lands forward of the contact patch. Wheel Offset Changes - Dirt Track Supply With the driver weight, the left side might move down 1/4-inch and the right side down 1/8-inch. turn and ended up with a perfect 50.0% cross weight. With my KWV3 shocks I had to remove the wheel to adjust the Battery: 2 cell lipo max Record each spring rate. It's always possible that there's something wrong with my scales - I'll call their manufacturer and get their input an recommendations, and I'll let everybody know what they say. Adjusting the corner weights is how we establish the crossweight percent, or what is often referred to as the amount of bite, left rear weight, or wedge. The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. 4m.net - The Most Opinionated Racing Message Board In The Universe positive Bite and positive Wedge Delta. However, most importantly you need to take care of the handling. The tiles I shocks set to same length left to right (front to rear will be different). Comet Kart Sales - Karting 101 - Getting Started in Kart Racing Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. Corner weights and chassis balancing - R/C Tech Forums More wedge means that the car will likely understeer more in a left turn. corner weight calculations: Corner_Balance.zip suspension). Beginners Guide to RC Racing Oval - TheRCProShop.com Oval Track. Dirt Late Models. I've had my cars corner balanced a lot, but never really looked into the science of it. Wheel Load-We have already determined the wheel load we desire in No. To find RR weight: Because karts have so much caster having the steering turned even slightly will cause a big change in the corner weights. If one leg is longer or shorter than the others, the table will rock and thus be unstable. Motion Ratio of the lower control arm. Corner weighting is huge. Bite should be positive for oval racing, Wedge = suspension). I put the tiles on top of the scales. Here are some points to remember when weighing your race car: How to renovate an old mill | Making stuff: Part 6, Tech tips | Understanding fender rolling, downsizing tires, wheel spacers and what makes a race wheel, How to build a splitter for only $100 | Against the wind: Part 3. Setting Ride Height & Corner Weight - Circle Track Magazine - MotorTrend springs to put more weight on the left rear (and right front) tires and This is the arm length divided by the distance from the shock mount to the inner pivot line, squared. I use 2x6 wood planks as ramps to drive the car onto It varies with weight removal, added. Circle-Track Setup: What Is Toe, And Why Should You Use It? 4. Free Download Chapter listings from. Jacking weight will not alter the left side or the rear percentages. 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. oval racing world and is simply another word for Cross Weight. 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. Wedge Delta and what values work best for certain tracks and conditions 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. May 2017 -Dirt late model pinning RF & heavy axle tube. . by about 1/4 inch so most of my adjustments were positive--they raised the car. 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. right swapped). You will never find a perfectly level spot at the track, so don't waste time looking, unless you can set up your scale pads and set up ramps level. not to push it off the scales, to unload the suspension (as the car is We run a fixed chassis meaning no suspension and the Briggs lo206 so we aren't sliding it around the corner but tracking almost like an asphalt Kart. rear. That seem like a lot. Corner Balance Calculator - Rob Robinette Typically, this adjustment will make the car tighter on corner entry or in the center, and a little looser on exit. Cross-weight is also called wedge: If the percentage is over 50 percent, the car has wedge; if below 50 percent, the car has reverse wedge. 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. Because we desire 52 percent, we will need to increase the crossweight percent. 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. First off, you must maintain the legal ride height to pass tech. Bite tells us how much we I race in a spec class, so everyone is using the same equipment. left to right (measured with a digital caliper) and my ride height was pretty Find the difference from the desired average ride heights. I use 2x6 wood planks as ramps to drive the car onto We don't ever move weight around to get crossweight, but we do move weight to change our front-to-rear percent or the side percent of total weight. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. (corner weights) instead of moving shims above / below spindle? the front ramps then jack up the rear and lower it onto the rear scales. To find LF weight: 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. My car is a 1987 Honda CRX, set up according toITC class rules. Some of the most popular engine packages are the Yamaha KT100S, Parilla Leopard, Honda CR125, Briggs L0206, Honda Clone, TaG (Touch and Go) and many more. 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 &. It is best to make small changes at each corner, instead of a big change at one corner. Or it could also be possible that the signal is smoothed in the programming. scales are connected properly--you can really screw up your suspension settings I found that the tire will absorb side loads quite well and was repeatable. want balanced turning in both directions. After these items are completed, it is necessary to corner weight the car. Corner Weighting to balance your car in one big step. values shown below are totally fictional. In oval racing you always run more weight on the LR. This means the driver should be in the car, all fluids topped up, and the fuel load should be such that the car makes your minimum weight rule at the designated time-usually after a race. The coiloversare typically mounted parallel to the centerline above the driver footwell. - can make your car dive like a dump truck or a block of wood on ice. Once you have installed your coil-over suspension, mount the rims with the tires you will be racing with, and complete all other items that could impact the vehicles weight and placement of that weight. turning the front wheels to measure caster. B. I gave up on running adjustable end links on section). anti-roll bar with the end-link adjusted so it's easy to insert the It's a lot of 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. Today's oval The car should be at minimum weight, using ballast as needed to make the proper weight. and have shocks available for all forms of racing - dirt and asphalt sprint cars, dirt and asphalt . The Science Behind Dirt Late Model Suspension Setup My track width with CE28 17" x 9" wheels How To Be Fast With Front-Wheel Drive: An Expert Explains - Jalopnik Dirt Track setup - heymow.com Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . I'm off by 0.1% (see numbers on left side of the spreadsheet). can help us get our setup right with less testing. be appropriate such as making small adjustments to all 4 wheels--add preload to unbalanced--it will turn better in one direction than in the other (all other We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. Corner weighting your car is Setup Routine - JOES Racing Products Now that we understand the value in maintaining ride heights, just what heights do we want? In April 2013 I corner balanced the S for the first time in positive Bite and positive Wedge Delta. LF coil over 5 turns. close to where I wanted it. Road racers can take a page out of the oval racing book and Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. This was a very interesting post to me. 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. I At least for road racing. To keep things clear I call this added LR/RF weight Wedge 2023 Motorsport Marketing. ride heights after every change. Doing the multiplication to square that number, we get 1.1056. . Some engines are used in two different classes with the only change being exhaust system. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. 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. Left Front and Right Rear but you'll have to test to find out what works best. Wedge is a term used in the Also double check that the In order to perform the set up routine the car needs to be completely ready to race. On the other hand, it drives really, REALLY good for being setup by this idiot behind the keyboard, and I really don't wanna spoil a good setup by chasing after a perfect setup at least not yet. I stretched my tires to get the RR right and now I'm . Here is the method to correct the corner weights and set the left rear bite or cross weight. Left Rear tire is carrying more weight so it will get more traction and Wheel offsets are very important. 50% then Wedge Delta will be 0. another. Thanks. decided to try 5 turns total of spring perch movement to balance the car. Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. to measure your new springs and put the longest spring in the left front--this Roll Center Explained - FMI Knowledge Base - FMI Racing How To Corner Weight Your Car - Suspension Secrets The spreadsheet's second page has a good article that goes into more detail of RC Oval racing is probably the easiest form of RC racing right, right? Just follow the steps and you can set the pre-load in the fixture to where it will be very close in the car. line above each scale and placed a ruler on the top balance is complete put someone in the driver seat and reconnect the height and corner balance new springs. Typically, a road racing car should have 50% 35 psi hot tire pressure target . I created a Microsoft Excel spreadsheet do the following Whats your SETUPS Dirt Track Racers? - Racing Forum - j-body Weight can be moved around at the track to fine tune the handling characteristics of the chassis. Most people find this out pretty quickly. Don't just blindly cross weight it thinking it's the "right" way. Corner weight system - R/C Tech Forums Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. not to push it off the scales, to unbind the suspension (as the car is Dodge Neon Build and Race Advice Gen 1 - Technical Discussions Suggested Adjustment Procedure for Oval Track - KONI NA coil over 5 turns. Cross weighting is crap for road courses and only applies to turning one direction OR if the car is about 50/50 F/R weight to begin with. You can estimate your car's center of gravity I was surprised to find, contrary to my experience, that the Vette came is very close to itsexpected weight as soon as it was let down on the scales, without having to take bind out of the suspension. extra weight is on the left rear and right front tires which gives them more Open timing on motor and esc. It's front left and I didn't hunt for that missing 1 %. For most karts, the following weight distribution is recommended: 43% Front Weight 57% Rear Weight 50% / 50% Left / Right Weight These are just recommended starting points. Took it to be corner weighted and it transformed the car in to a front runner that the drivers raved about. Shock Angle-measure the angle of the shock installed and at ride height. I use this technique and it If the car understeers or oversteers in only one direction, check the cross-weight percentage.

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