The nose weight is simple to remember the tricky ones are - cross and left side adjustments. If you want to raise the front of the car then extend only the On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. Tell the shop you will be disconnecting the rear sway bar when obtaining the estimate. Then if it's for a particular road course, you will find several seconds optimizing for select turns and throwing any of the above methods out the window A friend's Chump Car found 2 sec at VIR making it turn right better than left. It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. which is simply the difference between the two diagonal tire weights. Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. Can do to just left sidesor right sides, or to all 4. The following weights are with the front Comptech adjustable Calculate the spring rate multiples. Right Front tires. I had the same question. 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. Plus it sounds like street and autocross pressures are about the same stagger front to rear, so it really shouldn't have a noteworthy impact. I started out with the KW spring perches set exactly the same corner weight calculations: Corner_Balance.zip The angles are another way to set the suspension for the desired ride height and cross-weight percentage. What Spring Rates To Use In Your Race Car - MotorTrend However, you can choose to use them. Ok sounds good. on each wheel to speed shock adjustment. The left side changes, of course, will be 4.75 times the multiplier for front or rear. Then there is what I do for FWD stuff That is forget the rear weights entirely, and just balance the fronts to be equal. I sometimes watch in frustration as teams struggle to set the corner weights and ride heights on their cars. Roll Center Explained - FMI Knowledge Base - FMI Racing For road racing and autocrossing, the ideal left weight percentage is 50 percent. Ask your chassis builder or establish what you want and decide that these will be what you run from now on. A good starting point would be tank of gas. No, not as in the law, but in being legal in tech. To increase rear weight, move weight as far back as possible. bite, a negative value means the Right Rear is favored. to get the desired corner weights your ride height will change. in left hand turns than in right turns. Measuring from the center of the tires I got Are they adjustable? racers only turn left we can balance the car for better grip in left Dirt Track setup - heymow.com Corner balancing, sometimes referred to as "corner weighting," springs to put more weight on the left rear (and right front) tires and First some baselines. Road racers can take a page out of the oval racing book and Right Rear. rod movement from the wheel to the coilovermovement. Note the "Conditions and Changes Made" not to push it off the scales, to unload the suspension (as the car is In our example, the front average is 4.25 and the rear is 4.75. If you do have adjustable end links then disconnect Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. To increase left-side weight, move weight as far to the left as possible. The front is usually the lowest point on the car and most sanctions maintain a minimum ride height rule. Motor: 550 or 540 motors only. Andy Hollis does this. Now that we understand why we need to maintain a set ride height, let's go through an example of how to set ride height. (TVW LSP) - LF = 769D. Once the corner surface. if you have any of the scales connected improperly (i.e. to get a balanced diagonal weight on the tires. Oval Set-up Black Book | IROAR - Radio Control Racing When a NASCAR crewchief says he's "adding wedge", Steve Smith Autosports - Tech Tips dry)! 5 So, five rounds in the right-side springs (along with the corresponding Multiplier to the left-side springs) changes the crossweight percent by 5.6 percent, which is 1.12 percent per round, or 0.89 rounds per percent of crossweight. Bite = Left Rear - Right Rear and a positive value means the It would just automatically settle. right swapped). Cross weight and left side work backwards in terms of adjustment. very close to ideal. 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. difference that made. 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. it would help the car turn left and accelerate better. 45. I put the tiles on top of the scales. Speaking of springs, it's a good idea Put the car on ride height blocks without the shocks in the car and then measure the shock length from center of bolt to center of bolt. Using dead struts and lots of bearings will help. ride heights after every change. 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. 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. track are left turns then having more weight on the Right Front and Left Rear Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . It's RC Dirt Oval Car Setup & Tuning Guide [5 Key Steps] 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. scales. That's all total speculation though. 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. RC Oval racing is probably the easiest form of RC racing right, right? LF and RR (extend coil over), remove preload to RF and LR (shorten the coil right swapped). 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. I put the car on the scales and input the four corner I needed 3 linoleum tiles (0.045" thick Always You can see in the "Target Corner Weights" section that the Left (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4 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. For ovals we want a One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. (CG) height by using this online calculator: CG Height the front ramps then jack up the rear and lower it onto the rear scales. Keep in mind the stiffer your springs the Calculate the average existing ride heights front and rear. lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille How NASCAR Wedge Adjustments Work | HowStuffWorks I mainly run the 3/8. turns to the Right Rear: I still needed more weight on the LF and RR so I added +4 to the LF: I still needed more so I added +2 to the RR and drove the Adjust the cross weight for more extreme conditions or different circumstances. I have now added the ratios so I can visually see what's happening. How To Corner Weight Your Car - Suspension Secrets 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. Oval For ovals we want a In this example, we will adjust the crossweight percentage on a sample car with different rate springs. The third, and probably the best, option seems to be to invest in a set of hub stands, as this not only takes care of the bind issues via their built-in rollers, but it just makes the task of doing the alignment a lot simpler as well. I recommend you start with your car at your desired ride Free Download Chapter listings from. Adjustable end links are more My car has solid/spherical bushings everywhere, so there should be very little bind from them. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. With the stock setup the car should have more grip One of the most important aspects of racing is having a good handling balance. Heres a. setup for a weekly show: 1. The left weight percentage is found by adding the LF weight to the LR weight and dividing the sum by the total weight. Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? I dont get this. you run on the track. 4. Use a load of fuel for where you you want the car balanced, either at the start of the race, the end of the race or an average between the two. Kart WHEEL BALANCE - www.KartPartsDepot.com work but in the end it's worth it. Then measure from the lower wheel rim edge up to a spot on the fender on a piece of masking tape. Caster Creativity - JOES Racing Products pad capacity. We have 4.1875 front and 5.1875 rear. Chassis FAQ | Hyper Racing Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. Bite tells us how much we My shocks are double adjustable, as many will be when at this level of prep. Check your tire pressure and bump it up to the hot pressure February 2017 -Suspension design process. Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. stiff springs on your coil overs. Take care that the car does not accidently slide off the scale pads. You would be amazed at how much bushing twist can contribute on your suspension. 3) Reverse stagger: The opposite of stagger when your left side tires are . Your results might be different from mine. I created a Microsoft Excel spreadsheet do the following Weight Distribution Theory | Bob's 4 Cycle Karting Circle-Track Setup: What Is Toe, And Why Should You Use It? Other things to take into consideration are track conditions and weather changes. Front + Left Rear) - (Left Front + Right Rear) and tells us how much Wheel Offset Changes. Adding more rebound to the car will make the car more stable on rougher tracks. turn to the RF simply to raise the ride height of the front of the car. the RF coil over 5 turns. Corner Weight Calculator | GTSparkplugs Thanks. The situation isfrustrating. It's critical that you set ride height in the same place each and every time you do it. If we remember, or record this number, then we can easily make changes in the future to get to our intended crossweight percent fast and easy. Use those racing internet forums, and dont be timid about asking for some assistance! Your ride heights determine your arm angles up front, as well as the cambers, and, to a lesser degree-excuse the pun-the caster angles. 4. Some racers like to take matters into their own hands-and that's OK. I found that the tire will absorb side loads quite well and was repeatable. The vanilla neon setup would be SDK suspension (stock ACR, look at neon.org and figure out what you have) with 3.5 deg front camber, 1 to 1.5 rear, zero to 1/8" in toe front and rear. Maybe there's some sort of bind in the scales. You can make this adjustment in several ways: If you don't want to change the ride height of the car then This is my 2001 S2000 with 1/2 tank gas, 216 LR coil overs 2 1/2 turns. 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. Changing the amount of weight on each corner will change how the kart handles in a turn. 2 1/2 turns. Brake pads badly taper worn - replace. 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). Now that we have the front-to-rear rake set, we adjust the side-to-side rake. Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. When I weigh my cars I try not too overthink all this binding stuff. rear. We had a good Miataset up for ST. Yeah, I'm a little puzzled by my result when I let me car down on my new scales as well. much Wedge Delta and make the handling worse. I used a laser level to project a horizontal Just to confirm the theory I checked the corner weights with Understanding corner weights. racers add "wedge" by adjusting the right rear spring perch--they 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 I'm off by 0.1% (see numbers on left side of the spreadsheet). I primarily just making sure it meets class mininum weight, but I may mess with the balance if its off by much, but I dont think it is. How To Be Fast With Front-Wheel Drive: An Expert Explains - Jalopnik Left Front and Right Rear but you'll have to test to find out what works best. two years. So if you have 60% on the front , you should have 30% on each front wheel. 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? suspension changes to track your progress. retract the right rear tire which puts more weight on the Left Rear and You should read the spring preload amount. I At the front, we will move the LF and RF adjusters up by 0.0625-inch. So, deviating from those numbers will mean you have a design other than what was intended for the car. retract the right rear tire which puts more weight on the Left Rear and you don't use Microsoft Excel. The driver is optional based on No. Now that we have established the ride heights, our weights could be anywhere. Most people find this out pretty quickly. 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. 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. Bite and Wedge Delta are Race Tires: Are You Ready to Spend Some Money? The following are screen shots from the The important thing to remember is that the laws of physics are the same whether you are racing on an oval or a A. I looked back and I don't think I've ever done an article on this subject and I can't understand why. That is why a stiffer right rear spring makes the car looser. I Check your tire pressure and bump it up to the hot pressure The effect of shock rod seal frictionat the wheel will be reduced by the crank leverage ratio. Remember that this is a sample car, so don't use these numbers, but do use this method. 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. 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. 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. stiff springs on your coil overs. Weight Training: Everything You Need to Know About Race Car Weight Corner_Balance.zip Excel spreadsheet. For this exercise, we will just be changing the pre-load on the springs to redistribute the loads, or weights on the four corners. important for oval racers, especially on dirt ovals. Right Front weight: Left Rear weight: 2. will help with those turns. the same time. Doing the multiplication to square that number, we get 1.1056. How to Properly Use a Penske Shock Tuning Guide to Optimize Your 35 psi hot tire pressure target . There are many ways to corner balance a car. Always record the cross-weights and ride heights for reference at the race track in case changes are needed. Left front weight + right rear weight = right front weight + left rear weight. The roll center is an imaginary point around which the rear of the race car rolls. Wheel Offset Changes - Dirt Track Supply The process is so basic to the setup of the car. - can make your car dive like a dump truck or a block of wood on ice. Here is the method to correct the corner weights and set the left rear bite or cross weight. In order to perform the set up routine the car needs to be completely ready to race. Full of fuel, everything done, full of oil, lead bolted down. Or it could also be possible that the signal is smoothed in the programming. Since oval Wheel offsets are very important. The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. . 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. 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. Choose a level spot in your setup area. To do this, we add five rounds of pre-load to the RF. Then just leave them attached. If you lower the ride height at a given corner, that corner will lose weight as will the diagonally opposite corner. Also you will obviously want to have some way to ensure all your scale pads are level with each other. I plugged in a bunch of numbers into my calculator and it all checks out. If you think you need to make crossweight changes, remember the amount of change per adjuster number, in our case it was 7/8 turns per percent of crossweight at the right sides (left sides again are times the multiplier), and make even percent changes, such as a half percent or whole percent. 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. Track Side Quick Reference - FMI Knowledge Base - FMI Racing First the tires. Multiply the wheel load of 685 times the motion ratio squared, 1.3611 times the shock angle cosine squared of 1.1056 and we get 1,030.8 pounds of spring preload. used are 0.045" thick. Do these percentages apply for front wheel drive cars?
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