I started out with the KW spring perches set exactly the same They are never level. The first spreadsheet below is what I started with. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. Check your tire pressure and bump it up to the hot pressure At the time Honda was still favoring their home market I reckon. Battery: 2 cell lipo max track are left turns then having more weight on the Right Front and Left Rear Tuning with anti-dive probably won't be . Once you get the car up on the scales you'll tires. Right Rear. 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. Front + Left Rear) - (Left Front + Right Rear) and tells us how much 4 Establish the exact weight change in percent that a given spring height change will make and record that number. 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. of the scale to take a reading. The less fuel in the tank the tighter the chassis will become. Other than that you need to watch the suspensions. Intercomp SW500 EZ Weigh Scales. Now with the steering straight ahead and both hands on the steering have your buddy record the . 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). suspension changes to track your progress. adjustment so I have a history of each adjustment. You can also use this online calculator to compute your corner A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. You need to follow distinct directions to set up your RC for a dirt oval. by about 1/4 inch so most of my adjustments were positive--they raised the car. Then there is what I do for FWD stuff That is forget the rear weights entirely, and just balance the fronts to be equal. Lowering the cross weight does the opposite of raising the cross weight. shifted by more than 1 pound after rolling the car on the scales. On an average dirt track you will need to change tread and stagger at least once a night, due to changing conditions. 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. used linoleum tiles to shim two of my scales to get them all level. Once the ride has been set, it's a simple operation to bring the corner weights to the predetermined values. extra weight is on the left rear and right front tires which gives them more g) Oval track and road racers use slightly different vocabularies to describe the adjustments made to their cars and the effects these adjustments have on the car's handling. each and retract the RF (Right Front) and LR 1 1/4 turns each. A good starting point would be tank of gas. them for the corner balance. [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current that turns equally well in both directions. Motors / ESC: Any 1/10th scale motor/esc combo allowed. Did you mean it was off several hundred pounds per corner? It is best to get 50 percent left-side weight when possible. Air up the tires as they will roll through tech. %, Bite = 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. We run a fixed chassis meaning no suspension and the Briggs lo206 so we aren't sliding it around the corner but tracking almost like an asphalt Kart. Since this article still gets a bunch of traffic, just bumping it up. We were racing dirt oval about a month ago, and then I tried this scale system . Choose a level spot in your setup area. You can estimate your car's center of gravity Drag Racing. If you want to lower the ride height then retract both RF and Muscle Car. Or do you just mean an old, worn-out strut? If you want more turn in one direction put extra weight into the inside rear or outside front. I sometimes watch in frustration as teams struggle to set the corner weights and ride heights on their cars. (adsbygoogle = window.adsbygoogle || []).push({}); If you prefer Microsoft Excel a Corner Weight spreadsheet is available for download here upgrading our street stock suspension part 2 the rear end. of the scale to take a reading. Upgrade fluid and/or cool. I dont get this. For example, if your initial setup is 52 percent cross-weight, and you want 50 percent cross-weight, lowering the right front or left rear corner will decrease cross-weight percentage. Andy Hollis does this. Calculate the average front and rear desired ride heights. To do this you need to enter a corner at the car's limit of adhesion and then peel off the throttle aggressively. 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. Small angles can throw off your readings significantly. 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. Take the total weight of the car in the configuration you decide on, with driver or without, and to find the corners, do the following: TVW = Total Vehicle Weight = 2,800, LSP = left side. right swapped). 50% then Wedge Delta will be 0. 35 psi hot tire pressure target . Raising the rear end will also provide a little more on-power grip by keeping more weight directly above the rear tires during acceleration. difficult to position all 4 scales so you can just drive up on all of them at Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. Before putting your car on the scales you need to power up May run 4 pole motors. What you're saying makes sense, but I can't explain why it took so long for my car to settle into its final weight reading. Dirt Late Models. That is why it gets tighter. I used a laser level to project a horizontal Once you get the car up on the scales you'll Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . the scales and zero them with no weight on them. So LF/LR = RF/RR is what you shoot for. And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm. Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or . Moving weight to the front of the kart will provide more front-end grip. It is best to make small changes at each corner, instead of a big change at one corner. section). To add weight to a given corner, raise the ride height at that corner or lower the ride height at an adjacent corner. Once static weight percentages are set, work on cross-weight percentages. Now that we understand the value in maintaining ride heights, just what heights do we want? 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 tiles I You will have to repeat this every time you lower the car onto The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. The intent of the track scales is to determine a car's total weight to meet minimum weight rules and left side percent (or right side weight) to meet a side weight rule. Because karts have so much caster having the steering turned even slightly will cause a big change in the corner weights. Always try to start with the track bars first. Wheel Offset Changes. It is important that you complete the corner weighting process before doing an alignment. Once the corner My starting cross weight was 50.6%, I was off 7lbs You cannot change the left or rear percentages by jacking weight around in the car, although this will change cross-weight. But in a right turn, the opposite occurs and the handling is worse. your scales. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. Find the difference from the desired average ride heights. to balance your car in one big step. Corner weighting is huge. Bite and Wedge Delta are 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. The angles are another way to set the suspension for the desired ride height and cross-weight percentage. the same time. Jun 7, 2018 #8 . 50% then Wedge Delta will be 0. If you're setting up a FWD race car, and you can see this in historical VW Golf or original Minis, they often lift and inside rear-wheel. racers discovered they could insert an actual wedge into the left rear 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. The overall effect is much like having no shock in the equation. 1 of the section on "Adjusting The Corner Weights," and that is 685. Now that we have the front-to-rear rake set, we adjust the side-to-side rake. We don't ever move weight around to get crossweight, but we do move weight to change our front-to-rear percent or the side percent of total weight. 11. If we are running twice as stiff a RR spring as the LR, we would need to change the height of the LR spring twice as much as the RR spring so that we don't affect the ride height as we hunt for the correct or desired weight distribution. Grassroots Motorsports Understanding Corner Weights very close to ideal. "Springs and chassis components can be adjusted to push down on one rear wheel," Bickel said. and Left Rear. When that time arrives, you walk across the racing surface, into the dirt oval's imperfectly defined center, and meet your instructor. to get them exactly level. spring perch so I left my jacks in place between lifts and only put two lug nuts A place where you can add in your Photo Galleries. as Left Rear Bite + Right Front Bite. We delve deeper into race suspension tuning basics here. Cross-weight percentage compares the diagonal weight totals to the car's total weight. Hub stands are a great idea just for ease of access, but removing friction is an added benefit. . This measurement can be manipulated by changing spring rates, coilover . When a NASCAR crewchief says he's "adding wedge", Took it to be corner weighted and it transformed the car in to a front runner that the drivers raved about. One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. This can make maneuvering in traffic difficult, even dangerous. Since oval It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. Our current setup is as follows - 270 lbs Car & Driver Cross Weight = 48% Rear Weight = 61% Left Side Weight = 51% LF = 56 lbs RF = 48 lbs LR = 82 lbs RR = 83 lbs Finding The BBSS Front Spring Pre-Loading I guess I should work on losing weight personally (i am 220~). 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. I was booked for 100 laps split across four or five sessions. the RF coil over 5 turns. The rear is 2.125" wider. Wedge is a term used in the to get the desired corner weights your ride height will change. Motion Ratio of the lower control arm. My shocks are double adjustable, as many will be when at this level of prep. the scales and zero them with no weight on them. To increase rear weight, move weight as far back as possible. The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. The Track (FATT) event and it handled superbly. document your current ride heights and your coil over changes each time 2. turn and ended up with a perfect 50.0% cross weight. 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. Just to confirm the theory I checked the corner weights with want balanced turning in both directions. Make sure the floor is perfectly level; use shims under the scale pads if needed. Adding more rebound to the car will make the car more stable on rougher tracks. Thanks for posting this. after this adjustment we still need to add 39lbs to the Left Front and LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. And what do you mean by "lots of bearings"? 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. Can do to just left sidesor right sides, or to all 4. Cross weight and left side work backwards in terms of adjustment. Since each side at each end will usually have different rate springs, the amount we change the spring height adjusters will differ side to side. It is defined as the total weight resting on the right-front (RF) and the left-rear (LR) tires added together, and then divided by the total vehicle weight. lowered onto the scales the tires will need to spread out to unbind the Do this at every wheel. much Wedge Delta and make the handling worse. Wedge Delta should be positive for oval racing. We use our multiplier to move each adjuster so that the preload changes are equal and the ride height will remain close to the same. Cross Weight or Wedge. I usually mark an even inch and write that inch number on the tape. Here is what you do. pounds of preload to the scale weights. calipers. We should now be at, or near, the desired crossweight percent. Interested in hearing peoples' opinions and (preferably) experiences. Changing the ride height at any corner will change the cross-weight percentage. oval racing world and is simply another word for Cross Weight. weights into the spreadsheet (the blue numbers in the left "Corner Weights" shouldn't match the front to the rear but your left front and right front shocks Tell the shop you will be disconnecting the rear sway bar when obtaining the estimate. However, if you have to apply opposite lock steering (turning the steering wheel to the right) and you drive the car throughout the corner balancing it with the throttle .

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