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I dropped my integra off at edge to have this done today. All of these factors play a huge part in what each corner of the car will weigh. It's critical that you set ride height in the same place each and every time you do it. Please post on the appropriate 4m forum. Do these percentages apply for front wheel drive cars? I guess I should work on losing weight personally (i am 220~). If you want to raise the ride height then extend both LF and RR coil overs The spreadsheet's second page has a good article that goes into more detail of To maintain the ride heights, we also must reduce weight or preload at the LF and RR springs. That is why it gets tighter. Jacking weight will not alter the left side or the rear percentages. Using dead struts and lots of bearings will help. 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. Dirt Late Models. Road racers can take a page out of the oval racing book and So 2.5" springs and experimenting is the way to go- I think I know that much.. . Keeping track of Bite and the front ramps then jack up the rear and lower it onto the rear scales. Examine a modern push/pull rod suspension, particularly if it uses a crank link to transformthe Leebo's Corner. Proforms are cheap scales. As an autocrosser I've always thought that cross weight should be set at 50% and be done with it. be appropriate such as making small adjustments to all 4 wheels--add preload to I just run higher pressure for the street, I feel mine is pretty close as is. Ask your chassis builder or establish what you want and decide that these will be what you run from now on. It is important that you complete the corner weighting process before doing an alignment. Useful fabrication tips for just about any project, A crash course in 3D printing | Making Stuff: Part 2, How to make the move to an aftermarket ECU, 10 Must-Have Tools for a Scratch-Built Car, Fitting tires and wheels when an off-the-shelf option isnt listed. Astrut with its innards removed? I was booked for 100 laps split across four or five sessions. Front + Left Rear) - (Left Front + Right Rear) and tells us how much Oval Track. A perfectly corner balanced car will handle the same when turning left and right, and will maximize the tire contact area on all four corners. This will not change the left-side or rear weight percentages. To keep things clear I call this added weight Wedge Delta (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4 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. , Left Rear = For our example, we need to go from 49.8 to 54 percent. Now with the steering straight ahead and both hands on the steering have your buddy record the . used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales 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. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. It still pays to be thoughtful about weight placement fore and aft in your car. The following are screen shots from the positive Bite and positive Wedge Delta. Left Front and Right Rear but you'll have to test to find out what works best. cross weight. More wedge means that the car will likely understeer more in a left turn. At the right rear, a quarter-inch change in the height of the end of the link will change the angle and can make an asphalt car undriveable. My starting cross weight was 50.6%, I was off 7lbs The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars. B. calipers. I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. Or it could also be possible that the signal is smoothed in the programming. Wedge is a term used in the that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. I put the car on grease tiles so the tires move freely on the scales and then I bounce each end a couple times. the scales. That is because all of the points move together. want balanced turning in both directions. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. Adjust the cross weight for more extreme conditions or different circumstances. Search for: Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. Disconnect the sway bar. turns. I tried the the front ramps then jack up the rear and lower it onto the rear scales. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. Adjusting the sway bar is time consuming and questionable unless it is really stiff. 2. what he means is he's adding weight to the left rear and right front Lowering the cross weight does the opposite of raising the cross weight. Why? Are they adjustable? 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. 2 coils cut off springs 4 corners. springs to put more weight on the left rear (and right front) tires and If you lower the ride height at a given corner, that corner will lose weight as will the diagonally opposite corner. close to where I wanted it. Once the ride has been set, it's a simple operation to bring the corner weights to the predetermined values. from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up When working with static weight distribution, we use two percentages to analyze the car's corner weights: Left weight percentage and rear weight percentage. ZJjtX0xiMzjbfb86GLC7qpXBkrSlFeSNVds8hGW514OXUKSxf6kBDIneIL3TzHQV. With the stock setup the car should have more grip then leave them connected. Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. You can use rubber tires on very specific tracks and seasons. Delta is equal to (Right Corner weighting is huge. Always try to start with the track bars first. Corner weighing will tell you how much overall mass your car has as well as the mass present at each wheel. I can see binding throwing off each corners weight but the sum should be the same. rear. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will be 50%. Softer Right Front and Right Rear Springs 10 lbs at a time Car Loose at Corner Exit Reduce stagger rear tires Raise the Front ride Height Move the Right rear tire in. We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. on my garage floor for future reference. Today's oval battery (-15lbs), ride height lowered approximately 1 inch, all 4 Bilstein PSS9 coil over The angles are another way to set the suspension for the desired ride height and cross-weight percentage. Afterward you need to adjust the settings to the correct maneuvers. Now, look into details about the matter. Positive Caster is created when the caster line lands forward of the contact patch. Note your ride heights and 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. 3) Reverse stagger: The opposite of stagger when your left side tires are . 19. I overshot by a little so I raised the left rear spring perch by 1/2 difference that made. Just make sure none of them are flat or wildly overinflated. It seems to me that if there's bind in the suspension that's preventing all the force of the springs to come into play, the weight read by the scales will be less than the correct value. balance is complete put someone in the driver seat and reconnect the For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds Don't be in a hurry to set ride The Track (FATT) event and it handled superbly. is especially true if you don't have adjustable spring perches. And don't ever believe the track scales. I always thought it was the other way, shock travel was increased in order to have more movement for better control over the suspension? typically not concerned with bite and wedge delta because they usually First some baselines. 2 1/2 turns. Also double check that the This is the arm length divided by the distance from the shock mount to the inner pivot line, squared. How would you makesomething like that? shouldn't match the front to the rear but your left front and right front shocks Toe inn a 1/4 inch. line above each scale and placed a ruler on the top The roll center is an imaginary point around which the rear of the race car rolls. The Circle Track Analyzer is a computer program that simulates most any car you can design, racing on most any size oval track. 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. Calculate the average existing ride heights front and rear. Of course you can add too 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. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. important for cars with upgraded (stiffer) sway bars because they can exert a A set up plan will help you to build a race winning effort. The CG height over). preload (extending the shock) to the Left Front, and one positive turn to the Right Front. Today, dirt late model racers are using cutting-edge tools to pinpoint where gains can be made based on hard data. I Timely refresher that leaves me with a question Ive had for the last couple years that I have not found an answer to in hours of searching. I added the 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. Wedge Delta and what values work best for certain tracks and conditions balancing see my corner balance how-to and The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. Dirt track racing in Australia has a history dating back to the 1920s and 1930s. Check stagger at each tire, even if using radials. Make sure the tires are centered on the scales. weights into the spreadsheet (the blue numbers in the left "Corner Weights" things being equal). Right Front weight: Left Rear weight: Weight can be moved around at the track to fine tune the handling characteristics of the chassis. 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. Using dead strut inserts could be an option for cars with strut suspension. I made a 4-scale system for my off-road cars. The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. If you do have adjustable end This is for a race prepped 1984 Audi 4000 quattro(2375lbs. We delve deeper into race suspension tuning basics here. left to right (measured with a digital caliper) and my ride height was pretty Corner Weighting Less fuel equals faster speeds. Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. on each wheel to speed shock adjustment. If you want more turn in one direction put extra weight into the inside rear or outside front. 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. You can see the article here: (adsbygoogle = window.adsbygoogle || []).push({}); If you prefer Microsoft Excel a Corner Weight spreadsheet is available for download here Caster and Caster split can be adjusted to find more speed and stability. In our example it is 18 degrees. In our example we will be using the same method with corrections for different rate springs. 12. Once you get the car up on the scales you'll % Wedge Delta will be 0 at 50% Wedge. Other things to take into consideration are track conditions and weather changes. Oval racers favor left turns so they typically desire more weight on the right front and left rear tires. 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. Then the car will move more easily from one setting to another. traction or bite in left turns. To properly corner weight the car, it is necessary to add weight to the drivers seat which is approximately equal to the weight of the driver (or have the driver sit in the car). box in the "Ride Height" section of each spreadsheet. more important corner balancing becomes. Heres a. setup for a weekly show: 1. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. Now that we have established the ride heights, our weights could be anywhere. that turns equally well in both directions. spring perch so I left my jacks in place between lifts and only put two lug nuts Right Rear = RC Oval racing is probably the easiest form of RC racing right, right? For information on corner it would help the car turn left and accelerate better. The shock length as it is installed in the car at ride height. If your car's diagonal corner weights are not equal then its handling will be If one leg is longer or shorter than the others, the table will rock and thus be unstable. Once you have installed your coil-over suspension, mount the rims with the tires you will be racing with, and complete all other items that could impact the vehicles weight and placement of that weight. The salt acts as tiny ball bearings and will allow the tires to 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. They kept saying that it would go anywhere on the track and anywhere they pointed it. 2. Once the corner 8 Read the ride heights as they exist. I This was a very interesting post to me. % 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. If you raise the ride height at a given corner (put a turn in or add a round of wedge), the weight on that corner will increase, as will the weight on the diagonally opposite corner. It's If you think about this process and become familiar with the intent of it, then your process for setting ride heights and weight distribution should become easier and faster to do, not to mention less frustrating. It's the effective distribution that changes when you have suspension bind. That method keeps the ride heights close to the same. When looking at corner weighting, the cross weight (diagonal weight) is the most important component. 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 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. Air up the tires as they will roll through tech. Typically, this adjustment will make the car tighter on corner entry or in the center, and a little looser on exit. about 1/8" of wheel movement) to reduce the weight on the right front and left Drag Racing. Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. racers discovered they could insert an actual wedge into the left rear another. For pure race cars this isnt a consideration. lowered onto the scales the tires will need to spread out to unbind the Same goes for for swaybar endlinks. shifted by more than 1 pound after rolling the car on the scales. This approach is commonly used in oval track racing. Measuring from the center of the tires I got For road racing and autocrossing, the ideal left weight percentage is 50 percent. These weights are in ready to race form (including driver on board). You can also use this online calculator to compute your corner You've mentioned "dead struts" a couple of times - what do you mean by that? Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. It will let you predict and understand the effects that various modifications have on handling, performance and lap times.