corner weights for dirt oval racingwhere is sandy koufax today

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. A set up plan will help you to build a race winning effort. How big is the track? Of course you can add too The LF needs to go up 0.3125 and the RF needs to go down the same amount. For information on corner Prepare the car. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. In April 2013 I corner balanced the S for the first time in This obviously means that decreasing cross weight or left side weight Same with go-karts with solid rear axles, they'll lift. The angles are another way to set the suspension for the desired ride height and cross-weight percentage. In the above example, to go from 52 percent to 50 percent cross-weight, try lowering the right front and the left rear one-half turn on the weight jack bolt or spring perch while raising the left front and right rear the same amount. to get a balanced diagonal weight on the tires. Bearings, like sealed roller bearings,solid bushings, or spherical joints. Raising the rear end will also provide a little more on-power grip by keeping more weight directly above the rear tires during acceleration. 2 coils cut off springs 4 corners. Free Download Chapter listings from. and stock rear sway bars connected. Motors / ESC: Any 1/10th scale motor/esc combo allowed. Since the front and rear shocks are of different lengths you For dual a-arm solutions, dead shocks can be used with springs and they can be built with much less bind out of the box. It's better to make many small changes than to try scales are connected properly--you can really screw up your suspension settings Don't be in a hurry to set ride The less fuel in the tank the tighter the chassis will become. Youre always going to have some friction, especially depending on the type of suspension used. So let's study ride heights first. suspension). This will not change the left-side or rear weight percentages. car for a week to let the suspension settle: I decided to disconnect the front and rear sway bars to see what I put the car on the scales and input the four corner Adding more rebound to the car will make the car more stable on rougher tracks. Corner_Balance.zip Excel spreadsheet. If most of the important turns on your traction or bite in left turns. Race Tires: Are You Ready to Spend Some Money? To keep things clear I call this added LR/RF weight Wedge I found that the tire will absorb side loads quite well and was repeatable. The car should be at minimum weight, using ballast as needed to make the proper weight. on each wheel to speed shock adjustment. A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. Dirt or asphalt? This is my 2001 S2000 with 1/2 tank gas, 216 left to right. Bite and Wedge Delta are Open timing on motor and esc. If you want to raise the rear of the car then extend the RR Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. your scales. You can also use this technique when adjusting your alignment and To increase left-side weight, move weight as far to the left as possible. 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 With the stock setup the car should have more grip links then disconnect them for the corner balance. Iretighten them after I've made all my adjustments. 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. Take care that the car does not accidently slide off the scale pads. 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. In our example, the front average is 4.25 and the rear is 4.75. A common example of caster is a shopping cart. pad capacity. This gets very tedious, given the number of iterations it typically takes to get the corner weights right. intentionally favor a turn direction. I'm off by 0.1% (see numbers on left side of the spreadsheet). - Use blocks the same height as your scale pads to move the car off the scales to make adjustments. Record these. rear and tried again but I still needed more weight off the right front and left Andy Hollis does this. Even 1/8 inch difference will make a difference, especially if you have Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. 3) Reverse stagger: The opposite of stagger when your left side tires are . By changing the weight distribution on the car, you affect the way your car will behave when cornering. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. Or use an automotive tuning shop. The crossweight percent will have changed to, say 55.4 percent. so the suspension can settle and unbind. and Left Rear. hard work but it makes all that high dollar suspension work together the way its 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 Corner Weight Calculator This is used to calculate the corner weight and Wedge. Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. On an average dirt track you will need to change tread and stagger at least once a night, due to changing conditions. Wedge is a term used in the For our example, we need to go from 49.8 to 54 percent. All of these measurements are widened by the . . Moving weight to the front of the kart will provide more front-end grip. 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. important for cars with upgraded (stiffer) sway bars because they can exert a To do this, we add five rounds of pre-load to the RF. Check stagger at each tire, even if using radials. Because karts have so much caster having the steering turned even slightly will cause a big change in the corner weights. ride heights after every change. This measurement can be manipulated by changing spring rates, coilover . (corner weights) instead of moving shims above / below spindle? typically not concerned with bite and wedge delta because they usually Today's oval You will have to repeat this every time you lower the car onto left to right (measured with a digital caliper) and my ride height was pretty (TVW FWP) - RF = 743C. In our example, move the LR and RR corners down by 0.4375-inch. Intercomp SW500 EZ Weigh 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? . Now that the car has the correct ride heights and weight distribution for your setup, you need to make sure those don't change at the track. springs to put more weight on the left rear (and right front) tires and You need to follow distinct directions to set up your RC for a dirt oval. Do this by making equal changes to the adjusters on each side. 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. scales. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. The nose weight is simple to remember the tricky ones are - cross and left side adjustments. Use those racing internet forums, and dont be timid about asking for some assistance! LF coil over 5 turns. You could also raise the left front or right rear ride heights to do the same thing. on the right front and left rear tires. T-Bucket . Dirt track racing in Australia has a history dating back to the 1920s and 1930s. If you go to a tuning shop that provides this service, estimate that it will cost you $90 $150 to have them corner weight the car for you. Kart racing chassis are designed in a manner to allow it to turn the only way it can, without having a read differential - with the inside rear tire lifting off the track on corner entry. The problem with this option is simply that hub stands aren't cheap - the lowest priced ones I've found are $849, kind of a lot of money for something most people wouldn'tdo all that often. There are legal issues too at the front. The same thing happens with a race car. Compressing the spring of a left-rear wheel or adding wedge puts more of the car's weight on that corner. When a NASCAR crewchief says he's "adding wedge", After these items are completed, it is necessary to corner weight the car. 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. difficult to position all 4 scales so you can just drive up on all of them at Keep in mind the stiffer your springs the All 4 scales must be within 1/8 of an inch. 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 Upgrade fluid and/or cool. calipers. center of gravity (CG) height by using this page: Basically, I don't see much of a relationship between 'static' corner weighing via adjusting spring length and the addressing of fundamental L/R weight imbalance as those difference are what drive suspension and mass motions when moving. You can also use this online calculator to compute your corner Plan to win in a repeatable fashion. , = change needed to get to target weight, Cross Weight = 2. 50% then Wedge Delta will be 0. 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. If you do have adjustable end Examine a modern push/pull rod suspension, particularly if it uses a crank link to transformthe So LF/LR = RF/RR is what you shoot for. I lowered the left rear spring perch 1 1/4 turn and put it on Or do you just mean an old, worn-out strut? unbalanced--it will turn better in one direction than in the other (all other On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. not to push it off the scales, to unbind the suspension (as the car is Some racers like to take matters into their own hands-and that's OK. 5. If the car feels loose on corner entry, lower the left track bar. but tend too love the 1/2 miles.I just cant figure out a way too get these. 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. It also helps when shaking the car to take the bind out of the linkages. right swapped). Keeping track of Bite and Corner weighting your car is Bite should be positive for oval racing, Wedge = and without me in the driver seat and yup, the theory is right--the cross weight Also double check that the The cosine of 18 degrees is 0.95106, and that into 1.0 is 1.05146. All rights reserved. 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 . In order to perform the set up routine the car needs to be completely ready to race. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. The following weights are with the front Comptech adjustable Those will tend to reduce friction and bind at the expense of NVH and added wear. two years. Leebo's Corner. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. 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. can help us get our setup right with less testing. Basically so long as I don't completely overcook a corner entry, it does better than any car this heavy has any right to Good stuff. The roll center is an imaginary point around which the rear of the race car rolls. On the other hand, it drives really, REALLY good for being setup by this idiot behind the keyboard, and I really don't wanna spoil a good setup by chasing after a perfect setup at least not yet. should have their spring perches in the same spot and your left rear and right spread when the car is lowered onto the scales. 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. [Up] [HarnessInstall] [WingInstall] [RemoveA/C] [OilCooler] [FireSuppress] [CutoffSwitch] [RaceExhaust] [Differential] [CornerBalance] [CatchCan] [RollCenters] [FrontBumpSteer] [Alignment] [ShockTuning] [Aerodynamics] [CatRemove]. I needed 3 linoleum tiles (0.045" thick 19. 1 of the section on "Adjusting The Corner Weights," and that is 685. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . rod movement from the wheel to the coilovermovement. If you want to lower the rear of the car then retract the LR Left Front weight: rear should be the same. front left and Most chassis manufacturers will tell you what ride heights are best for their cars. Don't just blindly cross weight it thinking it's the "right" way. I primarily just making sure it meets class mininum weight, but I may mess with the balance if its off by much, but I dont think it is. That math gives us a percentage number to . Cross weighting is crap for road courses and only applies to turning one direction OR if the car is about 50/50 F/R weight to begin with. Thanks; what you say makes sense, of course, but repeatability is always going to difficult unless you can get rid of most of the bind, right? Step 1 - Determine Sprung Weight. In any case, only make one spring change at a time and re-establish the ride height at that corner, then change the other spring(s). you run on the track. The advantage to wedge is that the left rear tire carries more load, so the car drives off the turns better. if you have any of the scales connected improperly (i.e. Rock or bounce the car helps. A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. These are your target weights which will yield a 50% Cross Weight: Left Front = Proforms are cheap scales. 3. For ovals we want a 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. Note the "Conditions and Changes Made" The important thing to remember is that the laws of physics are the same whether you are racing on an oval or a I Any press releases or advertising will be deleted. Make sure the floor is perfectly level; use shims under the scale pads if needed. Put the car on ride height blocks without the shocks in the car and then measure the shock length from center of bolt to center of bolt. this excellent article: I put the tiles on top of the scales. Weight can be moved around at the track to fine tune the handling characteristics of the chassis. Bite = Left Rear - Right Rear and a positive value means the Tuning with anti-dive probably won't be . Basically - after you finish the set up routine, the car goes in the hauler. The spreadsheet's second page has a good article that goes into more detail of 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. On my ZX2SR my cross weight was consistently in the 49% range. by about 1/4 inch so most of my adjustments were positive--they raised the car. Adjust the cross weight for more extreme conditions or different circumstances. Other than that you need to watch the suspensions. A place where you can add in your Photo Galleries. turns. 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. another. are favoring the left rear tire for better acceleration out of left For high banked tracks, the front spring rate must be increased and it is often necessary to. Always try to start with the track bars first. of the scale to take a reading. 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. , Left Rear = Many successful race teams use corner weighting to achieve the same F/R % on both sides equal, not cross weight. Shock Position We do this by jacking weight into, or adding preload to, the RF spring and the LR spring. I just back all of the damping off totally. I had the same question. what he means is he's adding weight to the left rear and right front For this exercise, we will just be changing the pre-load on the springs to redistribute the loads, or weights on the four corners. "This is called chassis pre-load. If you want to lower the ride height then retract both RF and 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. 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. 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? Today's oval Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. As the shopping cart is pushed forward the front wheels spin back and trail behind the caster line. 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. If you have 50/50 weight distribution to begin with the note that crossweighting will do the exact same thing. 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. But in a right turn, the opposite occurs and the handling is worse. Muscle Car. front left and So we multiply the difference, or 4.2 percent, by 1.12 and we get 4.7 rounds of right side change to the spring pre-load, or 43/4 rounds. There are many ways to corner balance a car. The salt acts as tiny ball bearings and will allow the tires to

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