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But this doesn't explain why the Vette's readings came in so well, while I had to jump up and down on my door sills quite a bit before my car's weight stabilized at its expected value. I "two linoleum tiles & salt" technique to allow the tires to slide on the scales 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. The less fuel in the tank the tighter the chassis will become. (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4 7. how and why to corner balance a car. Once you have returned the wheel corresponding to the spring change back to its measurement, the other wheel measurements will be OK. 3. Front and Right Rear need 51 lbs of additional weight to balance the car. Would be interesting to see how close to ideal I got it though, given how well it handles already. Here is a screenshot with some random-ass corner weights. Guess I have to try it. If you want to raise the rear of the car then extend the RR more traction or bite in left turns. started with the Left Front because I wanted to raise the ride height of the car Wheelbase: 9.5" min, 11.5" max Maximum width: 10.250" Minimum weight: 57.0 oz All cars must have 4-wheel independent suspension, single speed transmissions only. 11. A. 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. Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. center of gravity (CG) height by using this page: At the time Honda was still favoring their home market I reckon. 50% then Wedge Delta will be 0. 4. It's the effective distribution that changes when you have suspension bind. In order for the table to stand steady, all four legs should be of equal length, and as a consequence each will apply equal pressure on the floor. It's better to make many small changes than to try Let's explore some ways to do this in an orderly and sensible way. unbalanced--it will turn better in one direction than in the other (all other All 4 scales must be within 1/8 of an inch. 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. All of these measurements are widened by the Of course you can add too tires. works well. need to roll the car back and forth a few inches several times, being careful On an average workbench/table that's close to level, it's probably < 3g difference per corner, which is within the tolerance of stiction / binding in a touring car. Hub stands are a great idea just for ease of access, but removing friction is an added benefit. rear. Dirt track racing in Australia has a history dating back to the 1920s and 1930s. right swapped). There are many ways to corner balance a car. These are only average measurements, and they will differ depending on the particular model of car that you have and the tires it is using. corner weight calculations: Corner_Balance.zip Check your tire pressure and bump it up to the hot pressure your scales. 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. The left side changes, of course, will be 4.75 times the multiplier for front or rear. 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. the same time. This was my first adjustment: Four turns of positive coil 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. Here's how we find the multipliers. If the car understeers or oversteers in only one direction, check the cross-weight percentage. extra weight is on the left rear and right front tires which gives them If not, adjust the ring until you read that number and then you can install the spring in the car and be very close to the correct ride height. of the scale to take a reading. Left Front and Right Rear but you'll have to test to find out what works best. tiles) on the left front and 1 on the left rear to level the scales. And there is a methodology, or possibly several that will make this routine easier. Then move components like the battery or fuel cell. 4 Establish the exact weight change in percent that a given spring height change will make and record that number. The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire 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. Calculate the spring rate multiples. on my garage floor for future reference. extra weight is on the left rear and right front tires which gives them more More wedge means that the car will likely understeer more in a left turn. Check static weight before working on cross-weight. Cross Weight or Wedge. Bite tells us how much we I recommend adding an eighth or slightly more to the lowest corner just to make sure you pass tech. The front will show close to 60%. Most people find this out pretty quickly. The other two corners will gain weight. However, most importantly you need to take care of the handling. them for the corner balance. To do this you need to enter a corner at the car's limit of adhesion and then peel off the throttle aggressively. more important corner balancing becomes. turns. Right Front = cars through the corners and thats where there eating me up. The CG height want balanced turning in both directions. 1 of the section on "Adjusting The Corner Weights," and that is 685. Make sure the tires are centered on the scales. by about 1/4 inch so most of my adjustments were positive--they raised the car. If your car's diagonal corner weights are not equal then its handling will be LR coil overs 2 1/2 turns. balance is complete put someone in the driver seat and reconnect the Lay the bag flat onto the scale pad, partially open to vent, lower the car into the bag. For our example, we need to go from 49.8 to 54 percent. On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. 11. very close to ideal. % 50% is optimal, Wedge = difficult to position all 4 scales so you can just drive up on all of them at This is the arm length divided by the distance from the shock mount to the inner pivot line, squared. 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. Its important to measure and note your 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. anti-roll bar with the end-link adjusted so it's easy to insert the Jun 7, 2018 #8 . 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. 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. To keep things clear I call this added weight Wedge Delta Caster and Caster split can be adjusted to find more speed and stability. This gets very tedious, given the number of iterations it typically takes to get the corner weights right. Astrut with its innards removed? If you want to lower the ride height then retract both RF and 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 Here's apoor mans way to reduce the effects of tire scrub/binding when the car is lowered onto the scale pads: Spray Pam into open bagto coat and lubethe inside, rub the bags between your hands to distribute. % Bite and Wedge Delta are Dirt Late Models. on the right front and left rear tires. Before putting your car on the scales you need to power up But stagger is not a good idea on a road course or autocross either, where the ideal is 50-percent cross-weight and no stagger. Do youhave recommendations for such corner weight percentages? Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. Toe inn a 1/4 inch. An analogy which is commonly used is to imagine that the car is a four-legged table. We delve deeper into race suspension tuning basics here. For most karts, the following weight distribution is recommended: 43% Front Weight 57% Rear Weight 50% / 50% Left / Right Weight These are just recommended starting points. the scales and zero them with no weight on them. Are they adjustable? A good starting point would be tank of gas. Using dead struts and lots of bearings will help. Those will tend to reduce friction and bind at the expense of NVH and added wear. These weights are in ready to race form (including driver on board). lowered onto the scales the tires will need to spread out to unbind the I still rolled the car back and forth a 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. you don't use Microsoft Excel. I guess I should work on losing weight personally (i am 220~). Always record the cross-weights and ride heights for reference at the race track in case changes are needed. tires. Front + Left Rear) - (Left Front + Right Rear) and tells us how much if you have any of the scales connected improperly (i.e. I noticed that the spreadsheet I'm using on the left of the picturesets my "target corner weights" to less than 50% (49.6%),why is that? Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. Once the corner balance is complete put someone in T-Bucket . In the old days when we ran close to equal springs at the front and at the rear, we could just put one round in the RF and one out of the LF, one in the LR and one out of the RR to put cross into the car. Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. You can see the article here: Minimizing the hysteresis is good, but it also minimizes the shock/spring contribution to effective 'at the wheel' unprung weight (mass). Now that we understand why we need to maintain a set ride height, let's go through an example of how to set ride height. With my KWV3 shocks I had to remove the wheel to adjust the The situation isfrustrating. turns. 45. A place where you can add in your Photo Galleries. knew I needed to put the car on the scales. The car should be at minimum weight, using ballast as needed to make the proper weight. 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. 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. Don't be in a hurry to set ride Changing the amount of weight on each corner will change how the kart handles in a turn. if you have any of the scales connected improperly (i.e. pad capacity. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. Calculator, I used these scales to weigh the car: 50% then Wedge Delta will be 0. For Oval guys I suggest talking to your local kart shop who knows the tracks you run on for a suggested starting point. 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. LF and RR (extend coil over), remove preload to RF and LR (shorten the coil 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. I use this technique and it after this adjustment we still need to add 39lbs to the Left Front and stiff springs on your coil overs. Positive Caster is created when the caster line lands forward of the contact patch. If your car's diagonal corner weights are not equal then its handling will be unbalanced--it will turn better in one direction than in the other (all other things being equal). Still, it is a worthwhile goal to strive for 50 percent left-side weight. Left Rear tire is carrying more weight so it will get more traction and . Right Front tires. Corner weighting is huge. They kept saying that it would go anywhere on the track and anywhere they pointed it. suspension). renting/borrowing/buying some scales and corner balancing your car. That makes every little detail that much more important. Shock Angle-measure the angle of the shock installed and at ride height. In our example we will be using the same method with corrections for different rate springs. Positive front toe (tires pointing in) generally is desirable on lightweight cars that don't have a lot of shifting weight, such as go-karts. values shown below are totally fictional. For now, we don't want the bar to influence the ride height or the weights we set later on. 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. I've read all the info before, in various places, but it's good to have a refresher. But this is almost never the case. surface. I lowered the left rear spring perch 1 1/4 turn and put it on The angles are another way to set the suspension for the desired ride height and cross-weight percentage. Determine your ride heights. McMaster-Carr adjustable end links The coiloversare typically mounted parallel to the centerline above the driver footwell. It is best to make small changes at each corner, instead of a big change at one corner. Please post on the appropriate 4m forum. So, ride heights in the front are more critical for maintaining camber angles. Tell the shop you will be disconnecting the rear sway bar when obtaining the estimate. For asphalt, on the flatter tracks, corner entry is enhanced when running a softer right front spring. . [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current