corner weights for dirt oval racing

Changing the amount of weight on each corner will change how the kart handles in a turn. I was surprised how much these high rate Bite and Wedge Delta are LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. front left and B. 5.00 front 8.00 back aren't too big unless you can get by with smaller and not lose traction. Weight Distribution Theory | Bob's 4 Cycle Karting This is for a race prepped 1984 Audi 4000 quattro(2375lbs. "Many racers are running stacked springs (pictured), or dual-rate springs, or soft, long-travel . how and why to corner balance a car. 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. 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. height and the shocks set to the exact same spring perch height Remember that there are several ways you can maintain ride heights at the track, with loaded spring length measurements, chassis to lower control arm or chassis to rear axle tube measurement are some of those. There are legal issues too at the front. 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. then leave them connected. So LF/LR = RF/RR is what you shoot for. racers add "wedge" by adjusting the right rear spring perch--they right swapped). the same time. Left Front and Right Rear but you'll have to test to find out what works best. shouldn't match the front to the rear but your left front and right front shocks Strive for repeatable and take the measurement as a data point, instead of an absolute. 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. PDF UNDERSTANDING CHASSIS ADJUSTMENTS - Longacre Racing Remember that this is a sample car, so don't use these numbers, but do use this method. And don't ever believe the track scales. Weight can be moved around at the track to fine tune the handling characteristics of the chassis. On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. I had the same question. Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. 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? 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. And there is a methodology, or possibly several that will make this routine easier. is especially true if you don't have adjustable spring perches. used are 0.045" thick. I'm anxious to see what Proform says about my experience. I was booked for 100 laps split across four or five sessions. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . oval racing world and is simply another word for Cross Weight. you don't use Microsoft Excel. Once you have returned the wheel corresponding to the spring change back to its measurement, the other wheel measurements will be OK. 3. Or am I missing something? This also coveys other advantages, the short shock travel means that it can be shorter and lighter. Measuring from the center of the tires I got (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. To do this, we add five rounds of pre-load to the RF. see on the right side of the spreadsheet's "Target Corner Weights" section that RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval - YouTube Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and Some engines are used in two different classes with the only change being exhaust system. The Track (FATT) event and it handled superbly. oval racing world and is simply another word for Cross Weight. . 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). The important thing to remember is that the laws of physics are the same whether you are racing on an oval or a used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales Look at the car as a chair with a short leg, if you want it to turn equally well left and right aim for 50/50 diagonal. 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 4 Things You Should Never Do In A Front-Wheel Drive Car the scales. But this is almost never the case. The nose weight is simple to remember the tricky ones are - cross and left side adjustments. The angles are another way to set the suspension for the desired ride height and cross-weight percentage. Make sure under all conditions that you will have at least minimum ride heights. Just to confirm the theory I checked the corner weights with Caster Creativity - JOES Racing Products The height of the rear roll center (and the front also) is critical to handling. I lowered the left rear spring perch 1 1/4 turn and put it on [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current 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. It's better to make many small changes than to try Setting Up Your Traxxas Slash | Traxxas So if you have 60% on the front , you should have 30% on each front wheel. 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. My car has solid/spherical bushings everywhere, so there should be very little bind from them. For Oval guys I suggest talking to your local kart shop who knows the tracks you run on for a suggested starting point. looking forward to getting it back! Dirt Late Models. Road racers can take a page out of the oval racing book and On an average dirt track you will need to change tread and stagger at least once a night, due to changing conditions. 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. are favoring the left rear tire for better acceleration out of left % Wedge Delta will be 0 at 50% Wedge. Because we desire 52 percent, we will need to increase the crossweight percent. difficult to position all 4 scales so you can just drive up on all of them at I started out with the KW spring perches set exactly the same that turns equally well in both directions. Handling Guide - RACING ON THE CHEAP Smaller will scrub less speed of if your not sideway threw the corner. 3.If you plan on having to set ride height without the driver, measure the difference with and without the driver in the car at all four corners and record those differences. Get the rear percentage as close to the manufacturer's specs as possible. Maybe I'm over-thinking this, but I was amazed when I got my new scales, and let my car down on them for the first time. The advantage to wedge is that the left rear tire carries more load, so the car drives off the turns better. Typically, a road racing car should have 50% How To Set Up RC Dirt Oval A Guide - Explained! McMaster-Carr adjustable end links Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. R. racing junky Member. (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) When Wedge is balanced at This is but one method and I encourage everyone to ask around and find a method that works for your type of car, this one may not be the most efficient. 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. positive Bite and positive Wedge Delta. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. pounds of preload to the scale weights. Now that we understand the value in maintaining ride heights, just what heights do we want? , = change needed to get to target weight, Cross Weight = If most of the important turns on your Delta is equal to (Right as Left Rear Bite + Right Front Bite. Ah, OK, thanks for the clarification. I installed In circle track racing, we often, and almost always, have different rate springs on each corner of the car. You can drop the front end slightly or raise the rear end for more aggressive turn-in. bite, a negative value means the Right Rear is favored. 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). One of the most important aspects of racing is having a good handling balance. Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. I see disconnecting the sway bar, and how to do it, but disconnect the shocks? It's a lot of For ovals we want a Bite and Wedge Delta are Toe inn a 1/4 inch. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. Corner Balance Calculator - Rob Robinette The only way to change the static weight distribution percentages is to physically move weight around in the car. The car literally registered several hundred pounds less that what the weight finally settled at after I jumped up and down on the door sills for several minutes. 4. of the scale to take a reading. However, many cars cannot make the 50 percent left-side weight percentage due to driver offset. 35 psi hot tire pressure target . But in a right turn, the opposite occurs and the handling is worse. Now that we have the front-to-rear rake set, we adjust the side-to-side rake. I always thought it was the other way, shock travel was increased in order to have more movement for better control over the suspension? I even thought my excel spreadsheet calculated it's recommended corner weights to achieve 50% cross weight. For information on corner from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up if you have any of the scales connected improperly (i.e. At the front, we will move the LF and RF adjusters up by 0.0625-inch. So let's study ride heights first. So, we are not reinventing the wheel here, just refining the process. What is Wedge in Dirt Racing? How Can it be Fixed? - Southern Reaceway Fans Mudboss Setup #3 - Traxxas Slash transmission setup and diff - YouTube To increase left-side weight, move weight as far to the left as possible. (TVW FWP) - RF = 743C. Keep in mind the stiffer your springs the How would you makesomething like that? I would imagine that disconnecting the shocks is only applicable to setups where the shock and spring are separate, like a lot of solid axle cars, or Mk2 Supras in my experience. There's Nothing In Racing Simpler-or Harder-Than Driving a Sprint Car PDF kart chassis setup and tuning manual - Southwest Karters It varies with weight removal, added. Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. 45. front left and in the driver's seat to load the suspension. Yeah generally its the same stagger 9/10 times. 5. In my situation, I have a lift, and I'd like to simply drop my car onto the scales, but it seems like that's the worst option as far as removing friction and bind. Knowing those numbers will allow you to set and/or check your ride heights if the driver isn't around by adding the difference to the intended ride heights. This adds pressure to that end of the car just like putting the paper wedge underneath the table leg. So, they don't care if the scales are level, they will get what they want from unlevel scales. Rethink Dirt: Advanced Dirt Track Theory | Hyper Racing To favor right turns, put more weight on the Unless you have some kind of stupid hyper-critically damped NASCAR type dampers this isn't really necessary. Adjustable end links are more Corner weighting can be a complicated process for you to complete without someone who is experienced helping you. left to right (measured with a digital caliper) and my ride height was pretty 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. As with the table, the corresponding diagonal corner of the vehicle gets more of the car's weight. Calculate the spring rate multiples. You will have to repeat this every time you lower the car onto Make small changes at the track, and make only one change at a time. We will deal with preload on the bar later on. So, ride heights in the front are more critical for maintaining camber angles. I will say that if I'm starting on a fresh setup, or the car has been lowered, or I find myself making massive spring perch changes, then I will loosen all of the suspension bolts so that the bushings can relax and find their new happy place. In our example, move the LR and RR corners down by 0.4375-inch. A jumbo ziploc bag prevents lube from escaping when not in use. Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. shocks set to same length left to right (front to rear will be different). 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). I didn't hunt for that missing 1 %. 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. Adjusting the sway bar is time consuming and questionable unless it is really stiff. Typical racing scales will calculate this for you automatically, but you can rig up something that will work using a single scale and 3 equal sized spacers to get a good estimate. I Here are some setup tips that will help you really get the most of of your Slash: > Keep it clean. 50% then Wedge Delta will be 0. If you want to lower the front of the car then retract only Guess I have to try it. I weigh 220. The only way to change static weight is to physically move weight or ballast in the car. 1. 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. Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. another. Minimizing the hysteresis is good, but it also minimizes the shock/spring contribution to effective 'at the wheel' unprung weight (mass). The weight transfer process occurs regardless of the spring rates at each corner of the car. Need some dirt oval setup advice! | Hobbyist Forums not to push it off the scales, to unbind the suspension (as the car is Before putting your car on the scales you need to power up positive Bite and positive Wedge Delta. They are not too suitable for racing and oval dirt cars. For our example we have LF 3.625, RF 4.75, LR 4.625, RR 5.75. You need: 1. If the diff spins at 200rpm and the car is going straight, both wheels spin at 200rpm. Setting static weight distribution and adjusting cross-weight percentage is one way to assure good handling. . 3. extra weight is on the left rear and right front tires which gives them more LR coil overs 2 1/2 turns. Right now I have (IIRC) 350 lb front and 200 lb rear springs (koni sport, eibach pro line, ST anti sway bars) . % 50% is optimal, Wedge = 2 1/2 turns. RC Oval Racing - Indy RC World So as long as you are draining the fluid from your shocks, also remove or cut away the seals. To find RR weight: And I cannot really move any weight around. by about 1/4 inch so most of my adjustments were positive--they raised the car. Cross weight and left side work backwards in terms of adjustment. When you adjust your coil overs close to where I wanted it. "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. Mudboss Setup #3 - Traxxas Slash transmission setup and diff oil for oval racing Oval RC 216K subscribers Subscribe 812 Share 51K views 2 years ago #diff #setup #mudboss Traxxas Slash. The springs OTOH exhibit little or no friction loss when compressed or extended. "two linoleum tiles & salt" technique to allow the tires to slide on the scales 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. I overshot by a little so I raised the left rear spring perch by 1/2 I used a laser level to project a horizontal Cross weights can be changed by making ride height adjustments to the coil-over suspension by either winding the lower spring platform up or down. you weigh and adjust. How To Corner Weight Your Car - Suspension Secrets The tiles & salt seemed to help because the weight never In our example, the front average is 4.25 and the rear is 4.75. 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. Left Front weight: [Up] [HarnessInstall] [WingInstall] [RemoveA/C] [OilCooler] [FireSuppress] [CutoffSwitch] [RaceExhaust] [Differential] [CornerBalance] [CatchCan] [RollCenters] [FrontBumpSteer] [Alignment] [ShockTuning] [Aerodynamics] [CatRemove]. You need to follow distinct directions to set up your RC for a dirt oval. Dirt or asphalt? Right Front weight: Left Rear weight: 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? Set them to hot pressures is the norm as I understand it. calipers. turn and ended up with a perfect 50.0% cross weight. We should now be at, or near, the desired crossweight percent. 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. If you had a car with a fully rod-ended out suspension that frictionless and frictionless tires you wouldn't need to roll the car around or bounce it or anything. You can I'm off by 0.1% (see numbers on left side of the spreadsheet). I usually mark an even inch and write that inch number on the tape. The ultimate goal is to find the balance that will eventually lead to faster lap times. 6. important for cars with upgraded (stiffer) sway bars because they can exert a Race Classes Whats Available and Acquiring a Racecar, Suspension, Glass Sunroof Replacement and Racing Seat and Harnesses, Fire System, Transponder, Rear View Mirror. Let's explore some ways to do this in an orderly and sensible way. if you have any of the scales connected improperly (i.e. The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. Some racers like to take matters into their own hands-and that's OK. shifted by more than 1 pound after rolling the car on the scales. I still rolled the car back and forth a Adjusting the corner weights is how we establish the crossweight percent, or what is often referred to as the amount of bite, left rear weight, or wedge. The CG height Then there is what I do for FWD stuff That is forget the rear weights entirely, and just balance the fronts to be equal. to get the desired corner weights your ride height will change. I painstakingly leveled the scales and marked their locations measure (literally). Always Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. If you moved only one point, then the problems begin. I dont get this. Leebo's Corner. Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. springs to put more weight on the left rear (and right front) tires and Astrut with its innards removed? Doing the multiplication to square that number, we get 1.1056. another. Upgrade fluid and/or cool. the scales and zero them with no weight on them. split the adjustment between all four wheels--extend the LF and RR 1 1/4 turns turn to the RF simply to raise the ride height of the front of the car. I found that the tire will absorb side loads quite well and was repeatable. The other two corners will gain weight.

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