The salt acts as tiny ball bearings and will allow the tires to You need to follow distinct directions to set up your RC for a dirt oval. so the suspension can settle and unbind. Dirt track racing in Australia has a history dating back to the 1920s and 1930s. Bite tells us how much we 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. (corner weights) instead of moving shims above / below spindle? In our example it is 18 degrees. cross weight. Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. For street cars it certainly can be. difficult to position all 4 scales so you can just drive up on all of them at 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. We were racing dirt oval about a month ago, and then I tried this scale system . 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. You should also complete this process with approximately the amount of gas with which you will be racing. Do not adjust any other wheel's spacing. The driver is optional based on No. May run 4 pole motors. Cross weight and left side work backwards in terms of adjustment. Motor: 550 or 540 motors only. Your results might be different from mine. 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). (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) When you lower the panhard bar the rear roll center drops. 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. retract the right rear tire which puts more weight on the Left Rear and That seem like a lot. retract the right rear tire which puts more weight on the Left Rear and cars through the corners and thats where there eating me up. important for oval racers, especially on dirt ovals. Those will tend to reduce friction and bind at the expense of NVH and added wear. battery (-15lbs), ride height lowered approximately 1 inch, all 4 Bilstein PSS9 coil over Unsure about autox. You will need to weight your vehicle on each tire to use this tool. To favor right turns, put more weight on the Or maybe I read the post wrong. Corner balancing, sometimes referred to as "corner weighting," difference that made. Taking the time and making the effort always pay dividends. turns. pounds of preload to the scale weights. 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. To truly optimize your shocks, your overall suspension setup must be right, including ride height, camber, caster, toe, and the correct spring rates. 13. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. Check stagger at each tire, even if using radials. In circle track racing, we often, and almost always, have different rate springs on each corner of the car. Oval Track. If it slows to 100rpm, the outside wheel will spin at 300rpm. 2. end-link into the anti-roll bar's hole. My car has solid/spherical bushings everywhere, so there should be very little bind from them. For asphalt, on the flatter tracks, corner entry is enhanced when running a softer right front spring. There are several ways race teams adjust corner weight. Here's how we find the multipliers. If most of the important turns on your When we make weight changes, we will move the adjuster rings or jack screws in multiples, the softer spring adjuster will need to move more than the stiffer spring adjuster by the multiple number so that the weight change will be the same side to side and the ride height will not change as a result. few inches several times on the scales before each reading though just for good I gave up on running adjustable end links on First some baselines. Your car may be designed to run different ride heights than these. 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. This obviously means that decreasing cross weight or left side weight 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. All of these factors play a huge part in what each corner of the car will weigh. Cross-weight is also called wedge: If the percentage is over 50 percent, the car has wedge; if below 50 percent, the car has reverse wedge. Toe inn a 1/4 inch. 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. Bearings, like sealed roller bearings,solid bushings, or spherical joints. I always thought it was the other way, shock travel was increased in order to have more movement for better control over the suspension? box in the "Ride Height" section of each spreadsheet. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . Left Front weight: The more power a car has, the more that static weight over the drive wheels helps acceleration off the corners. 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. Do these percentages apply for front wheel drive cars? Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. These are your current calculated weights: Left Weight = The only way to change static weight is to physically move weight or ballast in the car. On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. - can make your car dive like a dump truck or a block of wood on ice. On my ZX2SR my cross weight was consistently in the 49% range. And what do you mean by "lots of bearings"? As the shopping cart is pushed forward the front wheels spin back and trail behind the caster line. Disconnect and adjust later. 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. Now that we have the front-to-rear rake set, we adjust the side-to-side rake. Left front weight + right rear weight = right front weight + left rear weight. weights and percentages and generates target wheel weights to achieve a 50% Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. The left weight percentage is found by adding the LF weight to the LR weight and dividing the sum by the total weight. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. 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. I lowered the left rear spring perch 1 1/4 turn and put it on When that time arrives, you walk across the racing surface, into the dirt oval's imperfectly defined center, and meet your instructor. If you shocks are working normally they are not worth worrying about. Also double check that the 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. I used a laser level to project a horizontal the front ramps then jack up the rear and lower it onto the rear scales. TVW - (RF + LF + LR) = 603. If you do have adjustable end links then disconnect Scale Type: . 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. Race Tires: Are You Ready to Spend Some Money? Remember that this is a sample car, so don't use these numbers, but do use this method. 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. 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. You can also put two linoleum tiles with salt between them on I usually mark an even inch and write that inch number on the tape. The roll center is an imaginary point around which the rear of the race car rolls. Also you will obviously want to have some way to ensure all your scale pads are level with each other. springs settled over the first 3 months. Then the car will move more easily from one setting to another. Find the difference from the desired average ride heights. Open timing on motor and esc. 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. Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. Dirt Late Models. Right Front tires. hard work but it makes all that high dollar suspension work together the way its To favor right turns, put more weight on the 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. Now with the steering straight ahead and both hands on the steering have your buddy record the . Or am I missing something? In April 2013 I corner balanced the S for the first time in Many electronic scales will perform the calculations for you. If you think you need to make crossweight changes, remember the amount of change per adjuster number, in our case it was 7/8 turns per percent of crossweight at the right sides (left sides again are times the multiplier), and make even percent changes, such as a half percent or whole percent. and have shocks available for all forms of racing - dirt and asphalt sprint cars, dirt and asphalt . T-Bucket . 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. Right Rear = March 2017 - F1 suspension rules, independent rear suspension for dirt oval. Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. Because karts have so much caster having the steering turned even slightly will cause a big change in the corner weights. positive Bite and positive Wedge Delta. Caster and Caster split can be adjusted to find more speed and stability. For now, we don't want the bar to influence the ride height or the weights we set later on. Finding The BBSS Front Spring Pre-Loading It's one reason why racing pushrod suspensions tend to employ geometry with minimal shock/spring movement,requiring ultra-high spring rates and very high damping force shocks. 9. I have now added the ratios so I can visually see what's happening. All of these measurements are widened by the I have a 96 civic with a d16/manual. Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. The height of the rear roll center (and the front also) is critical to handling. used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales Then measure from the lower wheel rim edge up to a spot on the fender on a piece of masking tape. lowered onto the scales the tires will need to spread out to unbind the spread when the car is lowered onto the scales. Get the numbers right and the percentages will follow. I see disconnecting the sway bar, and how to do it, but disconnect the shocks? in the driver's seat to load the suspension. 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. Grassroots Motorsports Understanding Corner Weights That is why a stiffer right rear spring makes the car looser. Let's explore some ways to do this in an orderly and sensible way. turns. should have their spring perches in the same spot and your left rear and right Even 1/8 inch difference will make a difference, especially if you have I've spent an hour this afternoon trying to do corner weights "on the cheap" using our IKEA kitchen scale (cost - 15.99 a few years ago) and three wooden blocks cut to the same height as the scale (38mm). 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. Motion Ratio of the lower control arm. You need a nice, flat and level surface for the scales. turn to the RF simply to raise the ride height of the front of the car. Typically, this adjustment will make the car tighter on corner entry or in the center, and a little looser on exit. Do this at every wheel. 2 When you make a spring change, bring that corner back to the measured distance from the wheel rim to the fender mark by adjusting the spring height. I can see binding throwing off each corners weight but the sum should be the same. anti-roll bar with the end-link adjusted so it's easy to insert the If you want to raise the front of the car then extend only the A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. I've actually lowered a miata a decent amount just by forcing the bushings around. The tiles & salt seemed to help because the weight never April 2017 -Bracketing settings, 4WD high speed pavement vehicle. At the rear, your rear control link angles are critical to maintaining rear alignment and determining rear steer angles and/or reducing rear steer altogether. 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. I That makes every little detail that much more important. it would help the car turn left and accelerate better. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. Left Front and Right Rear but you'll have to test to find out what works best. I saved a copy of the spreadsheet for each two years. weights into the spreadsheet (the blue numbers in the left "Corner Weights" Since oval Ask your chassis builder or establish what you want and decide that these will be what you run from now on. Setting static weight distribution and adjusting cross-weight percentage is one way to assure good handling. Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? 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). 2 1/2 turns. I had the same question. Did you mean it was off several hundred pounds per corner? Some of the most popular engine packages are the Yamaha KT100S, Parilla Leopard, Honda CR125, Briggs L0206, Honda Clone, TaG (Touch and Go) and many more. Moving weight to the front of the kart will provide more front-end grip. My track width with CE28 17" x 9" wheels How big is the track? One of the most important aspects of racing is having a good handling balance. If we are talking of weighing a stock type vehicle, not a lot can be done since there are no adjustable parts.
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