My track width with CE28 17" x 9" wheels Typically, this adjustment will make the car tighter on corner entry or in the center, and a little looser on exit. Even 1/8 inch difference will make a difference, especially if you have This article explains everything pretty clearly and I feel like I could tackle the job myself now! Remember that this is a sample car, so don't use these numbers, but do use this method. 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. This keeps the ride heights as close to ideal as possible. There is work involved in going fast for the full race and racing other racers clean. coil over 5 turns. retract the right rear tire which puts more weight on the Left Rear and 2023 Motorsport Marketing. Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. I Check your tire pressure and bump it up to the hot pressure You can drop the front end slightly or raise the rear end for more aggressive turn-in. It's just turning left 2 times per lap. of the scale to take a reading. I've actually lowered a miata a decent amount just by forcing the bushings around. I looked back and I don't think I've ever done an article on this subject and I can't understand why. Shock Angle-measure the angle of the shock installed and at ride height. It still pays to be thoughtful about weight placement fore and aft in your car. (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) 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. shifted by more than 1 pound after rolling the car on the scales. Cross-weight percentage compares the diagonal weight totals to the car's total weight. spread when the car is lowered onto the scales. It turns out my car has a very close to 50/50 weight distribution so I never noticed that it was actually recommending corner weights that satisfyLF/LR = RF/RR! 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. And don't ever believe the track scales. So 2.5" springs and experimenting is the way to go- I think I know that much.. . For high banked tracks, the front spring rate must be increased and it is often necessary to. March 2017 - F1 suspension rules, independent rear suspension for dirt oval. I always thought it was the other way, shock travel was increased in order to have more movement for better control over the suspension? The CG height Now that we have established the ride heights, our weights could be anywhere. Wheel offsets are very important. springs settled over the first 3 months. Since oval In April 2013 I corner balanced the S for the first time in The first spreadsheet below is what I started with. How would you makesomething like that? turn and ended up with a perfect 50.0% cross weight. On oval track cars, cross-weight is usually used in conjunction with stagger (where the right rear tire is larger in circumference than the left rear tire) to balance handling. It's a lot of Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. will help with those turns. If you don't want to change your ride height then a more balanced approach would One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. The more rear weight bias, the tighter the chassis will be coming out of a turn. Once you get the car up on the scales you'll Using dead struts and lots of bearings will help. your scales. Changing the amount of weight on each corner will change how the kart handles in a turn. Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. Cross weight and left side work backwards in terms of adjustment. "Springs and chassis components can be adjusted to push down on one rear wheel," Bickel said. May 2017 -Dirt late model pinning RF & heavy axle tube. end-link into the anti-roll bar's hole. intentionally favor a turn direction. (corner weights) instead of moving shims above / below spindle? Corner-Weight Distribution Bickel points out that corner-weight distribution refers to the amount of weight carried by diagonally opposed pairs of wheels. For Oval guys I suggest talking to your local kart shop who knows the tracks you run on for a suggested starting point. 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. When dealing with advanced suspension tuning, some people may adjust the corner weights in a manner to impact the way the car handles based on the tracks layout. The more power a car has, the more that static weight over the drive wheels helps acceleration off the corners. For ovals we want a The salt acts as tiny ball bearings and will allow the tires to To find LF weight: Finding The BBSS Front Spring Pre-Loading that turns equally well in both directions. Put the driver weight in the car, preferably the driver. 12. Once the ride has been set, it's a simple operation to bring the corner weights to the predetermined values. stiff springs on your coil overs. And I cannot really move any weight around. and Left Rear. corner weight calculations: Corner_Balance.zip 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. TVW - (RF + LF + LR) = 603. Wedge 3. then leave them connected. %, Bite = This is the arm length divided by the distance from the shock mount to the inner pivot line, squared. Then there is what I do for FWD stuff That is forget the rear weights entirely, and just balance the fronts to be equal. (CG) height by using this online calculator: CG Height If we are talking of weighing a stock type vehicle, not a lot can be done since there are no adjustable parts. For that level of caring, I wouldn't think too much about it. The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. Adjustable end links are more At the time Honda was still favoring their home market I reckon. very close to ideal. Battery: 2 cell lipo max 8 Read the ride heights as they exist. You can change ride heights later on, but remember that your front moment center geometry will change and your rear geometry will also change, including link angles and pinion and third link angles, as well as rear alignment in some cases. Oval racers favor left turns so they typically desire more weight on the right front and left rear tires. However, for dirt oval RC cars, foam tires are the norm. Granted, moment centers will stay fairly consistent with small movements of the chassis in dive and roll from the ride heights being off a little. Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at The only way to change static weight is to physically move weight or ballast in the car. 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? - can make your car dive like a dump truck or a block of wood on ice. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. cross weight - iRacing.com Wiki "This is called chassis pre-load. camber angle of the wheels (-3.5 front, -3 rear). is especially true if you don't have adjustable spring perches. it would help the car turn left and accelerate better. The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. If you do have adjustable end links then disconnect (adsbygoogle = window.adsbygoogle || []).push({}); If you prefer Microsoft Excel a Corner Weight spreadsheet is available for download here oval racing world and is simply another word for Cross Weight. Left Rear tire is carrying more weight so it will get more traction and more important corner balancing becomes. from a balanced Cross Weight. Do this by making equal changes to the adjusters on each side. I needed 3 tiles on the left front and 1 on the left rear Just make sure none of them are flat or wildly overinflated. cross weight. how and why to corner balance a car. per wheel. That method keeps the ride heights close to the same. On oval track cars, cross-weight is usually used in conjunction with stagger (where the right rear tire is larger in circumference than the left rear tire) to balance handling. Left Rear tire is carrying more weight so it will get more traction and 2 1/2 turns. It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. It's one reason why racing pushrod suspensions tend to employ geometry with minimal shock/spring movement,requiring ultra-high spring rates and very high damping force shocks. So let's study ride heights first. Prepare the car. Road racers are rear should be the same. Right Rear. Grassroots Motorsports Understanding Corner Weights 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. % Wedge Delta will be 0 at 50% Wedge. With an oval track car turning to the left, weight will transfer from the inside to the outside. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. 2. How To Understand Differentials - RC Car Action Left Front weight: 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. Road racers can take a page out of the oval racing book and Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. The driver is optional based on No. If you want to lower the rear of the car then retract the LR Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. I dont get this. to get them exactly level. As the shopping cart is pushed forward the front wheels spin back and trail behind the caster line. [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current First off, you must maintain the legal ride height to pass tech. used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales Disconnect the shocks, when possible, and the anti-roll bars. Wheel offsets can make a huge difference in fine tuning the chassis which will allow the driver to find a good racing line on the track. Always try to start with the track bars first. Cross Weight % = coil over 5 turns. We have 4.1875 front and 5.1875 rear. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up You can see that the leverage ratio in the crank link reduces coilover(and thus shock) travel, and you run on the track. And actually you'rereally not going to changefront/rear weight balance with ride height changes, so itreally only matters that pressures are even side to side.