This can make maneuvering in traffic difficult, even dangerous. LF coil over 5 turns. The following weights are with the front Comptech adjustable For that level of caring, I wouldn't think too much about it. 3. There are many ways to corner balance a car. You cannot change the left or rear percentages by jacking weight around in the car, although this will change cross-weight. CG Height Calculator, Cross Weight % = intentionally favor a turn direction. That method keeps the ride heights close to the same. Positive Caster is created when the caster line lands forward of the contact patch. 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. 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" of the scale to take a reading. will help with those turns. Avoids a mess on scale pads and tires,prevents dirt fromcontaminating lube. That is equal to 7/8 turn of the adjuster. Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. The left side changes, of course, will be 4.75 times the multiplier for front or rear. 1 of the section on "Adjusting The Corner Weights," and that is 685. 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. Dirt or asphalt? 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 Strive for repeatable and take the measurement as a data point, instead of an absolute. 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. All of these measurements are widened by the 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. < Enter your corner weights in pounds or kilos and click 'Calculate'. 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. For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds Typical racing scales will calculate this for you automatically, but you can rig up something that will work using a single scale and 3 equal sized spacers to get a good estimate. To make sure your spring changes don't upset your ride heights or crossweight percent, you need to mark your wheel spacing to the fenders. difficult to position all 4 scales so you can just drive up on all of them at what he means is he's adding weight to the left rear and right front However, you can choose to use them. Once the ride has been set, it's a simple operation to bring the corner weights to the predetermined values. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. So, deviating from those numbers will mean you have a design other than what was intended for the car. I gave up on running adjustable end links on %, Bite = So, they don't care if the scales are level, they will get what they want from unlevel scales. You will have to repeat this every time you lower the car onto 3. Do this by making equal changes to the adjusters on each side. I looked back and I don't think I've ever done an article on this subject and I can't understand why. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. In the above example, to go from 52 percent to 50 percent cross-weight, try lowering the right front and the left rear one-half turn on the weight jack bolt or spring perch while raising the left front and right rear the same amount. important for oval racers, especially on dirt ovals. 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. Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. So let's study ride heights first. camber angle of the wheels (-3.5 front, -3 rear). adjustment so I have a history of each adjustment. tank of gas, and no driver or passenger: Now here's the same stock S2000 with a 215lb driver in the seat: I was really surprised to see how far off the stock S2000 was More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. When Wedge is balanced at lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille the scales. Doing the multiplication to square that number, we get 1.1056. But this is almost never the case. I created a Microsoft Excel spreadsheet do the following Corner_Balance.zip Excel spreadsheet. Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. Race Tires: Are You Ready to Spend Some Money? be appropriate such as making small adjustments to all 4 wheels--add preload to I stretched my tires to get the RR right and now I'm . 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. By changing the weight distribution on the car, you affect the way your car will behave when cornering. you weigh and adjust. 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. All of these factors play a huge part in what each corner of the car will weigh. Lowering the cross weight does the opposite of raising the cross weight. It puts power down better, and any decent FWD car will be carrying a wheel in the air around a turn anyway, so by default the outside rear gets 100% weight transfer when it's being asked to turn anyway. Check your tire pressure and bump it up to the hot pressure Changing the ride height at any corner will change the cross-weight percentage. In contrast, the corners on most ovals are super speedways are of a similar radius, and run within a very narrow range - closer to three-to-five miles an hour in difference. Or use an automotive tuning shop. positive Bite and positive Wedge Delta. Moving weight to the front of the kart will provide more front-end grip. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. Adjustable end links are more The following are screen shots from the Same with go-karts with solid rear axles, they'll lift. them for the corner balance. and stock rear sway bars connected. links then disconnect them for the corner balance. the front ramps then jack up the rear and lower it onto the rear scales. Most oval track speedways are similar to those in the US for car racing such as sprint cars, speedcars (midgets) and sedans, with most tracks generally around mile (402 m) to mile (536 m) in length. 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. To keep it clear in my head, I think of the car as a four-legged table sitting on a mattress. Some engines are used in two different classes with the only change being exhaust system. 11. I added the in left hand turns than in right turns. Any press releases or advertising will be deleted. turning the front wheels to measure caster. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. Corner Weighting can help us get our setup right with less testing. We have 4.1875 front and 5.1875 rear. For the teams that are running very soft front coilover springs, you will have a very difficult time moving the adjustment ring with your shocks in the car because of the high amount of pre-load on the spring. Always try to start with the track bars first. When I weigh my cars I try not too overthink all this binding stuff. 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. The Track (FATT) event and it handled superbly. The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. I put the car on the scales and input the four corner I can see binding throwing off each corners weight but the sum should be the same. May 2017 -Dirt late model pinning RF & heavy axle tube. decided to try 5 turns total of spring perch movement to balance the car. Road racers can take a page out of the oval racing book and 2023 Motorsport Marketing. Taking the time and making the effort always pay dividends. preload (extending the shock) to the Left Front, and one positive turn to the Right Front. Do this at every wheel. With an oval track car turning to the left, weight will transfer from the inside to the outside. Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. Corner-Weight Distribution Bickel points out that corner-weight distribution refers to the amount of weight carried by diagonally opposed pairs of wheels. it would help the car turn left and accelerate better. the scales. I have a 96 civic with a d16/manual. Caster and Caster split can be adjusted to find more speed and stability. Excessive front toe in will make a car turn into a corner quicker, & may create a loose condition. [Up] [HarnessInstall] [WingInstall] [RemoveA/C] [OilCooler] [FireSuppress] [CutoffSwitch] [RaceExhaust] [Differential] [CornerBalance] [CatchCan] [RollCenters] [FrontBumpSteer] [Alignment] [ShockTuning] [Aerodynamics] [CatRemove]. B. 2 coils cut off springs 4 corners. used linoleum tiles to shim two of my scales to get them all level. Plan to win in a repeatable fashion. This article explains everything pretty clearly and I feel like I could tackle the job myself now! I'm anxious to see what Proform says about my experience. much Wedge Delta and make the handling worse. used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales 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. 10. extra weight is on the left rear and right front tires which gives them Took it to be corner weighted and it transformed the car in to a front runner that the drivers raved about. Recheck air pressure often to assure ride heights stay consistent. 9. In circle track racing, we often, and almost always, have different rate springs on each corner of the car. Get the numbers right and the percentages will follow. Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. Front + Left Rear) - (Left Front + Right Rear) and tells us how much Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. 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. When you lower the panhard bar the rear roll center drops. 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. To carry the wheel load, the spring must be compressed quite a bit. Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. calipers. Bite tells us how much we However, most importantly you need to take care of the handling. unbalanced--it will turn better in one direction than in the other (all other shifted by more than 1 pound after rolling the car on the scales. Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. If you want to lower the ride height then retract both RF and Bite = Left Rear - Right Rear and a positive value means the Here's a box stock 2006 Honda S2000 with 5/8 of a Less fuel equals faster speeds. Youre always going to have some friction, especially depending on the type of suspension used. For pure race cars this isnt a consideration. The situation isfrustrating. At the front, we will move the LF and RF adjusters up by 0.0625-inch. retract the right rear tire which puts more weight on the Left Rear and You can use rubber tires on very specific tracks and seasons. 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. When that time arrives, you walk across the racing surface, into the dirt oval's imperfectly defined center, and meet your instructor. Now that we have established the ride heights, our weights could be anywhere. of its weight on the Left Front and Right Rear tires, and 50% on the Right Front Your car may be designed to run different ride heights than these. Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or . Now, look into details about the matter. 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? You should read the spring preload amount. tiles) on the left front and 1 on the left rear to level the scales. In almost all cases, the loss of cornering performance in one direction is greater than the gain in the other direction. see on the right side of the spreadsheet's "Target Corner Weights" section that of the scale to take a reading. Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. 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. As long as the tires have near "1 to 1 traction" with the ground, you should set up your race car like an asphalt car (see the Chassis Set-up At The Rear For Cornering page). 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. You can also put two linoleum tiles with salt between them on I borrowed some scales to weigh my Terceltomorrow. adjustments were 1 turn to the right front and 3/4 turn to the left rear. Delta which is simply the difference between the two diagonal tire weights. 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 &. Iretighten them after I've made all my adjustments. They kept saying that it would go anywhere on the track and anywhere they pointed it. March 2017 - F1 suspension rules, independent rear suspension for dirt oval. line above each scale and placed a ruler on the top Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. Check static weight before working on cross-weight. Or am I missing something? Your results might be different from mine.
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