corner weights for dirt oval racing

corner weights for dirt oval racingwhat happened to mark reilly strong island

For information on corner You can see in the "Target Corner Weights" section that the Left 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. RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval, GFRP, Custom Works, Purpose Built) - YouTube 0:00 / 43:10 Dirt Oval Setup & Tuning Tutorials RC Dirt Oval Basic Setup &. Excessive front toe in will make a car turn into a corner quicker, & may create a loose condition. 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. However, many cars cannot make the 50 percent left-side weight percentage due to driver offset. 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. turning the front wheels to measure caster. [Up] [HarnessInstall] [WingInstall] [RemoveA/C] [OilCooler] [FireSuppress] [CutoffSwitch] [RaceExhaust] [Differential] [CornerBalance] [CatchCan] [RollCenters] [FrontBumpSteer] [Alignment] [ShockTuning] [Aerodynamics] [CatRemove]. If you shocks are working normally they are not worth worrying about. Road racers can take a page out of the oval racing book and Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. 11. Thanks for posting this. Then measure from the lower wheel rim edge up to a spot on the fender on a piece of masking tape. Ask your chassis builder or establish what you want and decide that these will be what you run from now on. is especially true if you don't have adjustable spring perches. suspension changes to track your progress. My car is a 1987 Honda CRX, set up according toITC class rules. If you want to raise the rear of the car then extend the RR Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. Shock Angle-measure the angle of the shock installed and at ride height. I used a laser level to project a horizontal Rear weight percentage for road racing and autocrossing is less definite. The shock length as it is installed in the car at ride height. LF and RR (extend coil over), remove preload to RF and LR (shorten the coil Road racers are Why? Grassroots Motorsports Understanding Corner Weights. 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. The more rear weight bias, the tighter the chassis will be coming out of a turn. So LF/LR = RF/RR is what you shoot for. I race in a spec class, so everyone is using the same equipment. of its weight on the Left Front and Right Rear tires, and 50% on the Right Front Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. This makes the cornering force balanced from left to right and offers the best performance overall. I Taking the time and making the effort always pay dividends. % I use 2x6 wood planks as ramps to drive the car onto . racers add "wedge" by adjusting the right rear spring perch--they I've had my cars corner balanced a lot, but never really looked into the science of it. That seem like a lot. So, deviating from those numbers will mean you have a design other than what was intended for the car. line above each scale and placed a ruler on the top Get the rear percentage as close to the manufacturer's specs as possible. It is best to get 50 percent left-side weight when possible. Just to confirm the theory I checked the corner weights with If the person reduces the force with which he's pressing against the ceiling, the weight read by the scales will decrease. your scales. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. 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). 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. important for oval racers, especially on dirt ovals. For ovals we want a scales are connected properly--you can really screw up your suspension settings And there is a methodology, or possibly several that will make this routine easier. Astrut with its innards removed? 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. [ 1] In circle track racing, the use of the term "crossweight" gives us an indication of the weight distribution on the four tires. To find RR weight: This obviously means that decreasing cross weight or left side weight springs settled over the first 3 months. Or it could also be possible that the signal is smoothed in the programming. On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. On a road course, the cross-weight percentage should be very close to 50 percent, within a half-degree either way, to keep the handling balance similar in a right-hand turn compared to a left-hand turn. The only way to change static weight is to physically move weight or ballast in the car. Maybe there's some sort of bind in the scales. Crossweight is of no concern to the track officials. need to roll the car back and forth a few inches several times, being careful Minimizing the hysteresis is good, but it also minimizes the shock/spring contribution to effective 'at the wheel' unprung weight (mass). Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. They are not too suitable for racing and oval dirt cars. Did you mean it was off several hundred pounds per corner? 13. 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 Track (FATT) event and it handled superbly. This approach is commonly used in oval track racing. For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds You will need to weight your vehicle on each tire to use this tool. I had to do this with my truck. 50% then Wedge Delta will be 0. Bite = Left Rear - Right Rear and a positive value means the This also coveys other advantages, the short shock travel means that it can be shorter and lighter. 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. In oval racing you always run more weight on the LR. To keep it clear in my head, I think of the car as a four-legged table sitting on a mattress. stiff springs on your coil overs. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . A common example of caster is a shopping cart. I was surprised how much these high rate lowered onto the scales the tires will need to spread out to unbind the Just follow the steps and you can set the pre-load in the fixture to where it will be very close in the car. weights: Corner Weight Calculator if Also you will obviously want to have some way to ensure all your scale pads are level with each other. 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. The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. Wedge Delta and what values work best for certain tracks and conditions I was booked for 100 laps split across four or five sessions. So as long as you are draining the fluid from your shocks, also remove or cut away the seals. First some baselines. Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced. Today's oval If you get the car neutral in left turns, it oversteers in right turns. 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. Of course you can add too 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. So, we are not reinventing the wheel here, just refining the process. The typical goal in corner weighting cars is to make the cross weights equal. Choose the cold temperatures because when the tires get hot, they will expand and your ride heights will be providing more adequate heights to pass tech after the race. Since oval You would be amazed at how much bushing twist can contribute on your suspension. You can also use this online calculator to compute your corner So if you have 60% on the front , you should have 30% on each front wheel. Finding The BBSS Front Spring Pre-Loading Same with go-karts with solid rear axles, they'll lift. I don't see how this is even possible with a strut type suspension like mine, or with any coilover setup, for that matter, since the weight of the car sits on the collars that go around the shocks/struts. 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. To increase rear weight, move weight as far back as possible. Lay the bag flat onto the scale pad, partially open to vent, lower the car into the bag. I don't like the lower weight ratings and plastic scale pads of proform. racers discovered they could insert an actual wedge into the left rear I still rolled the car back and forth a 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. shifted by more than 1 pound after rolling the car on the scales. Corner weighting is huge. Speaking of springs, it's a good idea Wheel offsets can make a huge difference in fine tuning the chassis which will allow the driver to find a good racing line on the track. For that level of caring, I wouldn't think too much about it. 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. Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at For ovals we want a another. Wedge Delta and what values work best for certain tracks and conditions Disconnect the shocks, when possible, and the anti-roll bars. These weights are in ready to race form (including driver on board). They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. Make small changes at the track, and make only one change at a time. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. that turns equally well in both directions. 5.00 front 8.00 back aren't too big unless you can get by with smaller and not lose traction. 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. Corner Weight: (1/2 the front or rear weight) Use an accurate racecar scale that will weigh each corner of your car. Do not adjust any other wheel's spacing. suspension). 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. These are your current calculated weights: Total Weight = Front Weight = % Left Weight = % Right Weight = % Rear Weight = % Cross Weight = 50% is optimal Bite = Bite should be positive for oval racing Wedge = % Wedge Delta should be positive for oval racing Then the car will move more easily from one setting to another. Ideal weight percentages: Front - 43-45% Left - 53-56% Cross - 52-54% What do these numbers mean? Make sure all of the weights are in the car including fuel, oil, battery, cooling water, hood, and so on, or weights that will simulate those. 7. May run 4 pole motors. unbalanced--it will turn better in one direction than in the other (all other Open timing on motor and esc. 9. Calculate the average existing ride heights front and rear. [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current be appropriate such as making small adjustments to all 4 wheels--add preload to what he means is he's adding weight to the left rear and right front Left Rear tire is carrying more weight so it will get more traction and Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. Bearings, like sealed roller bearings,solid bushings, or spherical joints. Calculate the spring rate multiples. Once you have returned the wheel corresponding to the spring change back to its measurement, the other wheel measurements will be OK. 3. To find RF weight: 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. I installed "If your car is really tight or really loose during hot laps, you have to take a look at the things that are going to make the biggest difference. Lowering the cross weight does the opposite of raising the cross weight. more important corner balancing becomes. Keep in mind the stiffer your springs the about 1/8" of wheel movement) to reduce the weight on the right front and left should have their spring perches in the same spot and your left rear and right Since I went to 800 front and 700lb rear springs over the winter I Left front weight + right rear weight = right front weight + left rear weight. and stock rear sway bars connected. . Upgrade fluid and/or cool. For pure race cars this isnt a consideration. With my KWV3 shocks I had to remove the wheel to adjust the The last event in the rain i actually had the rears up to around 38. Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. I see disconnecting the sway bar, and how to do it, but disconnect the shocks? A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. T-Bucket . I have a 96 civic with a d16/manual. I use 2x6 wood planks as ramps to drive the car onto 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 And what do you mean by "lots of bearings"? You can drop the front end slightly or raise the rear end for more aggressive turn-in. It's just turning left 2 times per lap. The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. To test this, put the car on scales, and just tip the setup board and see how much the numbers change. , Left Rear = But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. Corner weighting your car is It has to, it's just the laws of physics. Corner Weighting Keeping track of Bite and Rock or bounce the car helps. 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. left to right. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. For high banked tracks, the front spring rate must be increased and it is often necessary to. 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 is work involved in going fast for the full race and racing other racers clean. Andy Hollis does this. Scale Type: . That math gives us a percentage number to . two years. want balanced turning in both directions. You need a nice, flat and level surface for the scales. I put the tiles on top of the scales. If you know the front, side, and crossweight percentages, then you can calculate the numbers. 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. 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. Ok sounds good. Most people find this out pretty quickly. Wheel Offset Changes. Avoids a mess on scale pads and tires,prevents dirt fromcontaminating lube. if you have any of the scales connected improperly (i.e. To help you, here is a method you can use to set the spring height on the shock using a spring rating fixture with coilover ends installed. adjustments were 1 turn to the right front and 3/4 turn to the left rear. Race Tires: Are You Ready to Spend Some Money? extra weight is on the left rear and right front tires which gives them I usually mark an even inch and write that inch number on the tape. Adjustable end links are more %Right Weight = Record these. turns to the Right Rear: I still needed more weight on the LF and RR so I added +4 to the LF: I still needed more so I added +2 to the RR and drove the this excellent article: 1 of the section on "Adjusting The Corner Weights," and that is 685. Wedge Delta can also be thought of Always record the cross-weights and ride heights for reference at the race track in case changes are needed. work but in the end it's worth it. track are left turns then having more weight on the Right Front and Left Rear front left and Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? I've read all the info before, in various places, but it's good to have a refresher. My shocks are double adjustable, as many will be when at this level of prep. Since this article still gets a bunch of traffic, just bumping it up. you run on the track. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. used linoleum tiles to shim two of my scales to get them all level.

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