Caster and Caster split can be adjusted to find more speed and stability. 3.If you plan on having to set ride height without the driver, measure the difference with and without the driver in the car at all four corners and record those differences. Any press releases or advertising will be deleted. rear should be the same. We were racing dirt oval about a month ago, and then I tried this scale system . [Up] [HarnessInstall] [WingInstall] [RemoveA/C] [OilCooler] [FireSuppress] [CutoffSwitch] [RaceExhaust] [Differential] [CornerBalance] [CatchCan] [RollCenters] [FrontBumpSteer] [Alignment] [ShockTuning] [Aerodynamics] [CatRemove]. Calculate the average front and rear desired ride heights. renting/borrowing/buying some scales and corner balancing your car. Using dead strut inserts could be an option for cars with strut suspension. < Enter your corner weights in pounds or kilos and click 'Calculate'. scales are connected properly--you can really screw up your suspension settings Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. turns. Thanks for posting this. pounds of preload to the scale weights. Wedge is a term used in the That's all total speculation though. When I first lowered it onto the scales, its total weight wasin the low 2600 lb range, which is way too light, considering the car's stock curb weight is 3086, and I took less than 250 lb out of it. You can also use this online calculator to compute your corner As an autocrosser I've always thought that cross weight should be set at 50% and be done with it. If you do have adjustable end links then disconnect The total spring perch more important corner balancing becomes. % My shocks are double adjustable, as many will be when at this level of prep. Well there is a bit more to it than that. Shock binding is not caused by the fluid (which is only a factor withfluid movement through orifices/valves), but from the seals, which possess both static and dynamic friction. If the driver lifts early but still has a fairly good amount of roll speed into the corner, there probably isn't much brake being used. TVW - (RF + LF + LR) = 603. 2. anti-roll bar with the end-link adjusted so it's easy to insert the very close to ideal. Delta is equal to (Right 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. Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. tires. Or am I missing something? Be sure to have the weight of the driver in the seat. Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. That is why a stiffer right rear spring makes the car looser. want balanced turning in both directions. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. track are left turns then having more weight on the Right Front and Left Rear over racers only turn left we can balance the car for better grip in left For pure race cars this isnt a consideration. knew I needed to put the car on the scales. Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. All of these measurements are widened by the 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 As the shopping cart is pushed forward the front wheels spin back and trail behind the caster line. The crossweight percent will have changed to, say 55.4 percent. links then disconnect them for the corner balance. much Wedge Delta and make the handling worse. Don't just blindly cross weight it thinking it's the "right" way. I have now added the ratios so I can visually see what's happening. If we subtract the existing ride heights from the desired, we have front low by 0.0625-inch and the rear high by 0.4375-inch. When a NASCAR crewchief says he's "adding wedge", I and Left Rear. The left weight percentage is found by adding the LF weight to the LR weight and dividing the sum by the total weight. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. These are your current calculated weights: Left Weight = Disconnect the sway bar. anti-roll bars then leave them connected. If one leg is longer or shorter than the others, the table will rock and thus be unstable. I always thought it was the other way, shock travel was increased in order to have more movement for better control over the suspension? It's just turning left 2 times per lap. 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. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. Drag Racing. Remember that changes in stagger, tire pressures and springs will change the ride height and alter the cross-weight percentage. Before putting your car on the scales you need to power up You need a nice, flat and level surface for the scales. 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. I tried the Some engines are used in two different classes with the only change being exhaust system. McMaster-Carr adjustable end links another. Put the driver weight in the car, preferably the driver. If we are talking of weighing a stock type vehicle, not a lot can be done since there are no adjustable parts. I lowered the left rear spring perch 1 1/4 turn and put it on To properly corner weight the car, it is necessary to add weight to the driver's seat which is approximately equal to the weight of the driver (or have the driver sit in the car). With my KWV3 shocks I had to remove the wheel to adjust the Weight can be moved around at the track to fine tune the handling characteristics of the chassis. The shock length as it is installed in the car at ride height. 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. it would help the car turn left and accelerate better. This was my first adjustment: Four turns of positive coil You should read the spring preload amount. My track width with CE28 17" x 9" wheels For ovals we want a Now that's pretty cool! Classic Truck. It has to, it's just the laws of physics. It also helps when shaking the car to take the bind out of the linkages. First the tires. Cross weight and left side work backwards in terms of adjustment. Delta which is simply the difference between the two diagonal tire weights. 50% then Wedge Delta will be 0. as Left Rear Bite + Right Front Bite. I mainly run the 3/8. can help us get our setup right with less testing. be appropriate such as making small adjustments to all 4 wheels--add preload to lot of force to the suspension. You can make this adjustment in several ways: If you don't want to change the ride height of the car then At the time Honda was still favoring their home market I reckon. You can Make small changes at the track, and make only one change at a time. That seem like a lot. Funny. You can also estimate your car's To find RR weight: Calculate the average existing ride heights front and rear. You can see in the "Target Corner Weights" section that the Left Here's how we find the multipliers. and measured between the outside bottom rim edge is 67.75" front and 69.875" Also double check that the 10. I started out with the KW spring perches set exactly the same Interested in hearing peoples' opinions and (preferably) experiences. Search for: March 2017 - F1 suspension rules, independent rear suspension for dirt oval. 5. Disconnect and adjust later. that turns equally well in both directions. Other than that you need to watch the suspensions. Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. Air up the tires as they will roll through tech. Still, it is a worthwhile goal to strive for 50 percent left-side weight. I just back all of the damping off totally. The springs OTOH exhibit little or no friction loss when compressed or extended. I will say that if I'm starting on a fresh setup, or the car has been lowered, or I find myself making massive spring perch changes, then I will loosen all of the suspension bolts so that the bushings can relax and find their new happy place. rod movement from the wheel to the coilovermovement. Calculator, I used these scales to weigh the car: How would you makesomething like that? Always record the cross-weights and ride heights for reference at the race track in case changes are needed. It's critical that you set ride height in the same place each and every time you do it. racers add "wedge" by adjusting the right rear spring perch--they Or do you just mean an old, worn-out strut? coil over 5 turns. Toe inn a 1/4 inch. Upgrade fluid and/or cool. The last event in the rain i actually had the rears up to around 38. how and why to corner balance a car. - can make your car dive like a dump truck or a block of wood on ice. When working with static weight distribution, we use two percentages to analyze the car's corner weights: Left weight percentage and rear weight percentage. To do this, we add five rounds of pre-load to the RF. 45. Examine a modern push/pull rod suspension, particularly if it uses a crank link to transformthe Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. If it slows to 100rpm, the outside wheel will spin at 300rpm. Since I went to 800 front and 700lb rear springs over the winter I 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. I had to do this with my truck. Did you mean it was off several hundred pounds per corner? B. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . Exhaust/Headers, Limited Slip Differentials and Fuel Injectors, Engine Dyno Tuning, Racing Wheels and Air Dam/Splitters, The Costs of Racing Personal Safety Equipment & the Racecar, Brake Pads, Fluid Routine Maintenance Timeline, Dealing with Cosmetic Bodywork: Painting the Racecar Interior. Its important to measure and note your "This is called chassis pre-load. on the right front and left rear tires. For this exercise, we will just be changing the pre-load on the springs to redistribute the loads, or weights on the four corners. There are many ways to corner balance a car. All 4 scales must be within 1/8 of an inch. At least for road racing. rear. This keeps the ride heights as close to ideal as possible. Check your tire pressure and bump it up to the hot pressure . The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars.

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