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Even 1/8 inch difference will make a difference, especially if you have Comet Kart Sales - Karting 101 - Getting Started in Kart Racing typically not concerned with bite and wedge delta because they usually dry)! Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . Do this at every wheel. you run on the track. You can also put two linoleum tiles with salt between them on Now, I didn't have the sway bars disconnected, not did I put anything slippery between the tires and the scales - I just wanted to get a quick look at the total weight of my car, but the amount of error caused by all the friction was pretty startling. Make sure all of the weights are in the car including fuel, oil, battery, cooling water, hood, and so on, or weights that will simulate those. Left Rear tire is carrying more weight so it will get more traction and The typical goal in corner weighting cars is to make the cross weights equal. RC Oval Racing - Indy RC World 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. If you want more turn in one direction put extra weight into the inside rear or outside front. 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). I dropped my integra off at edge to have this done today. Weight Distribution Theory | Bob's 4 Cycle Karting works well. The only way to change the static weight distribution percentages is to physically move weight around in the car. And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm. Adjust the cross weight for more extreme conditions or different circumstances. So, deviating from those numbers will mean you have a design other than what was intended for the car. However, many cars cannot make the 50 percent left-side weight percentage due to driver offset. 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. The more power a car has, the more that static weight over the drive wheels helps acceleration off the corners. 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. Bite tells us how much we 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. It is best to make small changes at each corner, instead of a big change at one corner. The following weights are with the front Comptech adjustable For our example, we use LF 4.00, RF 4.50, LR 4.50, RR 5.00. I usually mark an even inch and write that inch number on the tape. 4 Things You Should Never Do In A Front-Wheel Drive Car The less fuel in the tank the tighter the chassis will become. To add weight to a given corner, raise the ride height at that corner or lower the ride height at an adjacent corner. Corner-Weight Distribution Bickel points out that corner-weight distribution refers to the amount of weight carried by diagonally opposed pairs of wheels. On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. The tiles I 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. Corner weighting is huge. Rear weight percentage for road racing and autocrossing is less definite. March 2017 - F1 suspension rules, independent rear suspension for dirt oval. I Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? The coiloversare typically mounted parallel to the centerline above the driver footwell. [ 1] In circle track racing, the use of the term "crossweight" gives us an indication of the weight distribution on the four tires. can help us get our setup right with less testing. How would you makesomething like that? Brake pedal is soft, spongy and/or long before the car is run: Air in the system - bleed brakes. How to Properly Use a Penske Shock Tuning Guide to Optimize Your front left and Corner weight system - R/C Tech Forums Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. LR coil overs 2 1/2 turns. 1. The tiles & salt seemed to help because the weight never If you are using scales as a base, level the scales with a long level, a long straight piece of tubing, square or round with a smaller level, or better yet, an instrument level such as a construction level. the scales and zero them with no weight on them. You've tried springs, shocks, different bars, neutralizing the anti-roll bar, and nothing seems to work. Your car may be designed to run different ride heights than these. more traction or bite in left turns. from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up 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. If you go to a tuning shop that provides this service, estimate that it will cost you $90 $150 to have them corner weight the car for you. Corner weighting your car is If a setup sheet read as "30 pounds of bite", there would be 30 pounds more weight on the left-rear than the right-rear. That math gives us a percentage number to . Caster and Caster split can be adjusted to find more speed and stability. Once the corner balance is complete put someone in The fact about this concept is when you put a softer right rear bar in, the car rolls more to the right rear but it is actually transferring less weight. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. I have a 96 civic with a d16/manual. racers add "wedge" by adjusting the right rear spring perch--they %Right Weight = Some engines are used in two different classes with the only change being exhaust system. It has to, it's just the laws of physics. My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car. Wedge Delta can also be thought of 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. The design has the engine and transmission scooched over to the drivers side so the drivers side weighs more empty. 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. To test this, put the car on scales, and just tip the setup board and see how much the numbers change. A place where you can add in your Photo Galleries. stiff springs on your coil overs. If you want to raise the ride height then extend both LF and RR coil overs I've read all the info before, in various places, but it's good to have a refresher. I needed 3 linoleum tiles (0.045" thick We will deal with preload on the bar later on. In order to perform the set up routine the car needs to be completely ready to race. The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. 4. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. Bite = Left Rear - Right Rear and a positive value means the Funny. Then the car will move more easily from one setting to another. Road racers can take a page out of the oval racing book and Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. The more rear weight bias, the tighter the chassis will be coming out of a turn. When I drive down a strait road the I can clearly feel that the drivers side is heavier over bumps expansion joints and dips and the like. Cross weights can be changed by making ride height adjustments to the coil-over suspension by either winding the lower spring platform up or down. 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. in left hand turns than in right turns. The salt acts as tiny ball bearings and will allow the tires to lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille If you decide to have a tuning shop complete the corner weighting and assuming you are not driving the car to the shop, disconnect the rear sway bar yourself to save the shop time and you money. Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. Wedge is a term used in the work but in the end it's worth it. over Race Classes Whats Available and Acquiring a Racecar, Suspension, Glass Sunroof Replacement and Racing Seat and Harnesses, Fire System, Transponder, Rear View Mirror. Many successful race teams use corner weighting to achieve the same F/R % on both sides equal, not cross weight. Just to confirm the theory I checked the corner weights with 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. Move ballast first, since it's easier. Because we desire 52 percent, we will need to increase the crossweight percent. Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. the same time. Unsure about autox. 13. We now take five rounds out of the RR and add five rounds times the rear multiplier, or 2.0 5 = 10 rounds to the LR. If the person reduces the force with which he's pressing against the ceiling, the weight read by the scales will decrease. 2 1/2 turns. difficult to position all 4 scales so you can just drive up on all of them at Whats your SETUPS Dirt Track Racers? - Racing Forum - j-body I race in a spec class, so everyone is using the same equipment. tiles) on the left front and 1 on the left rear to level the scales. Check your tire pressure and bump it up to the hot pressure right swapped). Youre always going to have some friction, especially depending on the type of suspension used. 12. You can RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval - YouTube center of gravity (CG) height by using this page: 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. This is my 2001 S2000 with 1/2 tank gas, 216 I sometimes watch in frustration as teams struggle to set the corner weights and ride heights on their cars. 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? The total spring perch When you lower the panhard bar the rear roll center drops. I weigh 220. They are never level. This approach is commonly used in oval track racing. . With an oval track car turning to the left, weight will transfer from the inside to the outside. I lowered the right front spring perch 1 full turn (equates to Right Front tires. 2. the same time. I overshot by a little so I raised the left rear spring perch by 1/2 The rear weight percentage is found in a similar manner: Add the LR and the RR weight together and divide the sum by the total weight. The other two corners will gain weight. from a balanced Cross Weight. Small angles can throw off your readings significantly. Other than that you need to watch the suspensions. Or maybe I read the post wrong. racers only turn left we can balance the car for better grip in left Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. You've mentioned "dead struts" a couple of times - what do you mean by that? 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. I dont get this. Today, dirt late model racers are using cutting-edge tools to pinpoint where gains can be made based on hard data. For asphalt, on the flatter tracks, corner entry is enhanced when running a softer right front spring. When Wedge is balanced at 3. (corner weights) instead of moving shims above / below spindle? racers add "wedge" by adjusting the right rear spring perch--they Kart racing chassis are designed in a manner to allow it to turn the only way it can, without having a read differential - with the inside rear tire lifting off the track on corner entry. . turn and ended up with a perfect 50.0% cross weight. Kart WHEEL BALANCE - www.KartPartsDepot.com 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? More wedge means that the car will likely understeer more in a left turn. I created a Microsoft Excel spreadsheet do the following Those will tend to reduce friction and bind at the expense of NVH and added wear. weights and percentages and generates target wheel weights to achieve a 50% The "Corner Weight" (virtual scales) now determines the ride height and/or corner weigh . Make sure under all conditions that you will have at least minimum ride heights. Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. Dirt Race Car Handling Problems; Diagnosing and Fixing - Hogan Technologies I painstakingly leveled the scales and marked their locations of its weight on the Left Front and Right Rear tires, and 50% on the Right Front will help with those turns. For our example we use: LF 200, RF 250 - 250 200 = 1.25 multiplier for the front. First off, you must maintain the legal ride height to pass tech. The last event in the rain i actually had the rears up to around 38. If you don't have adjustable end links on your The effect of shock rod seal frictionat the wheel will be reduced by the crank leverage ratio. the driver seat and reconnect them so there's no preload on them. The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. Or do you just mean an old, worn-out strut? Determine your ride heights. That is why a stiffer right rear spring makes the car looser. more important corner balancing becomes. The first is to use traditional lift-off oversteer. Leebo's Corner. want balanced turning in both directions. Handling Guide - RACING ON THE CHEAP Step 1 - Determine Sprung Weight. track are left turns then having more weight on the Right Front and Left Rear I made a 4-scale system for my off-road cars. right swapped). left to right. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. Besides the eventual move to an adjustable ride height set up, I feel like I need 100 lbs or so more spring in the left front. Before putting your car on the scales you need to power up Measure control arm angles after each change. To favor right turns, put more weight on the 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. We had a good Miataset up for ST. That is equal to 7/8 turn of the adjuster. 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. Dirt Track setup - heymow.com The only way to change static weight is to physically move weight or ballast in the car. Bite tells us how much we All rights reserved. For our example, we need to go from 49.8 to 54 percent. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. I mainly run the 3/8. Wheel offsets are very important. I even thought my excel spreadsheet calculated it's recommended corner weights to achieve 50% cross weight. TVW - (RF + LF + LR) = 603. Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. need to roll the car back and forth a few inches several times, being careful used linoleum tiles to shim two of my scales to get them all level. Please post on the appropriate 4m forum. 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. I started out with the KW spring perches set exactly the same 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. Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. I borrowed some scales to weigh my Terceltomorrow.
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