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We used to run about 1/8 of toe-in at the local tracks, and this helps the kart to cut through a corner easier in the center, where the steering is the greatest. Get the rear percentage as close to the manufacturer's specs as possible. LR coil overs 2 1/2 turns. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . We had a good Miataset up for ST. If you moved only one point, then the problems begin. I put the tiles on top of the scales. Here's a box stock 2006 Honda S2000 with 5/8 of a Corner weighting your car is box in the "Ride Height" section of each spreadsheet. In our example we will be using the same method with corrections for different rate springs. Wheel Load-We have already determined the wheel load we desire in No. If most of the important turns on your 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. To favor right turns, put more weight on the As for setting the left side and right side equal, I understandthe reason why it might be best, but hard for me to picture how to adjust it. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. I started out with the KW spring perches set exactly the same tiles) on the left front and 1 on the left rear to level the scales. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. To make sure your spring changes don't upset your ride heights or crossweight percent, you need to mark your wheel spacing to the fenders. you raise the rear of the car 10 inches or more and re-weigh it. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. to get a balanced diagonal weight on the tires. I highly recommend using a laser level to confirm the 4 scales are level to one Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. Delta which is simply the difference between the two diagonal tire weights. and stock rear sway bars connected. To increase rear weight, move weight as far back as possible. The advantage to wedge is that the left rear tire carries more load, so the car drives off the turns better. 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. No, not as in the law, but in being legal in tech. 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. Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. Then the car will move more easily from one setting to another. racers discovered they could insert an actual wedge into the left rear 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. suspension). 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. 5. Free Download Chapter listings from. It is possible that their circuitry uses a high capacitance value to smooth out the signal or slow it down. Check stagger at each tire, even if using radials. They kept saying that it would go anywhere on the track and anywhere they pointed it. It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. If you don't have adjustable end links on your anti-roll bars Left Rear tire is carrying more weight so it will get more traction and The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. I use this technique and it 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. 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. Always try to start with the track bars first. another. 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. should have their spring perches in the same spot and your left rear and right Right Front = over). Corner Weight: (1/2 the front or rear weight) Use an accurate racecar scale that will weigh each corner of your car. 57.5" front and 59.625" rear. 2. - can make your car dive like a dump truck or a block of wood on ice. Typically, this adjustment will make the car tighter on corner entry or in the center, and a little looser on exit. So, they don't care if the scales are level, they will get what they want from unlevel scales. All 4 scales must be within 1/8 of an inch. Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. 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. your scales. 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. turns. close to where I wanted it. I put the car on grease tiles so the tires move freely on the scales and then I bounce each end a couple times. Well there is a bit more to it than that. Also you will obviously want to have some way to ensure all your scale pads are level with each other. If you want to raise the ride height then extend both LF and RR coil overs However, most importantly you need to take care of the handling. Motors / ESC: Any 1/10th scale motor/esc combo allowed. 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. Still, it is a worthwhile goal to strive for 50 percent left-side weight. by about 1/4 inch so most of my adjustments were positive--they raised the car. 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 suspension). TVW - (RF + LF + LR) = 603. Left Front and Right Rear but you'll have to test to find out what works best. 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 Disconnect and adjust later. Take the cosine of that angle, divide it into 1.0 and then square it, or multiply it by itself. My car is a 1987 Honda CRX, set up according toITC class rules. The cosine of 18 degrees is 0.95106, and that into 1.0 is 1.05146. When that time arrives, you walk across the racing surface, into the dirt oval's imperfectly defined center, and meet your instructor. 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. Proforms are cheap scales. "Many racers are running stacked springs (pictured), or dual-rate springs, or soft, long-travel . Motor: 550 or 540 motors only. Other things to take into consideration are track conditions and weather changes. Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at (CG) height by using this online calculator: CG Height 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). 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. A 50% Cross Weight will yield a balanced handling car, one not to push it off the scales, to unbind the suspension (as the car is Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . . 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. For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds %Right Weight = (TVW FWP) - RF = 743C. The following are screen shots from the Adjust the front up by 0.0625-inch and the rear down by 0.4375-inch. You need: 1. It will let you predict and understand the effects that various modifications have on handling, performance and lap times. in left hand turns than in right turns. My big stumbling block on this subject is how to get accurate readings by removing all the friction/bind from the tires, sway bars, bushings, etc. I stretched my tires to get the RR right and now I'm . balancing see my corner balance how-to and things being equal). 1 Establish the corner weights you think you need for your car. the front ramps then jack up the rear and lower it onto the rear scales. Conversely, if the car feels tight throughout the corner, raise both track bars. When looking at corner weighting, the cross weight (diagonal weight) is the most important component. 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. Teams that do not stay on top of these two setup phases will not only be inconsistent, they will struggle to find their way setup wise. If you don't have adjustable end links on your Wedge Delta and what values work best for certain tracks and conditions Calculator, I used these scales to weigh the car: One of the most important aspects of racing is having a good handling balance. I just back all of the damping off totally. Recheck air pressure often to assure ride heights stay consistent. Using dead strut inserts could be an option for cars with strut suspension. Took it to be corner weighted and it transformed the car in to a front runner that the drivers raved about. 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. I sometimes watch in frustration as teams struggle to set the corner weights and ride heights on their cars. I guess I should work on losing weight personally (i am 220~). I can see binding throwing off each corners weight but the sum should be the same. That is why a stiffer right rear spring makes the car looser. cross weight. springs to put more weight on the left rear (and right front) tires and March 2017 - F1 suspension rules, independent rear suspension for dirt oval. track are left turns then having more weight on the Right Front and Left Rear Right Front tires. spread when the car is lowered onto the scales. 35 psi hot tire pressure target . B. Step 1: Setup And Tuning The Tires Most regular RC cars use rubber tires. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. 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 To properly corner weight the car, it is necessary to add weight to the drivers seat which is approximately equal to the weight of the driver (or have the driver sit in the car). Shock Angle-measure the angle of the shock installed and at ride height. Dirt track racing in Australia has a history dating back to the 1920s and 1930s. At least for road racing. 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. Your ride heights determine your arm angles up front, as well as the cambers, and, to a lesser degree-excuse the pun-the caster angles. So 2.5" springs and experimenting is the way to go- I think I know that much.. . Moving weight to the front of the kart will provide more front-end grip. Jun 7, 2018 #8 . This was a very interesting post to me. Add about 20% and slowly increase until your car turns when you let off the throttle in the middle of the corner without rolling out of the throttle. Check your tire pressure and bump it up to the hot pressure I always thought it was the other way, shock travel was increased in order to have more movement for better control over the suspension? track are left turns then having more weight on the Right Front and Left Rear The roll center is an imaginary point around which the rear of the race car rolls. Same goes for for swaybar endlinks. 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. Thinking about this a little, the weight measured by the scales is the sum of the force of gravity acting on the car's mass, and the force of the springs pressing downward. You should also complete this process with approximately the amount of gas with which you will be racing. Search for: Check your tire pressure and bump it up to the hot pressure 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. intentionally favor a turn direction. to measure your new springs and put the longest spring in the left front--this The spreadsheet's second page has a good article that goes into more detail of Right Rear. When a NASCAR crewchief says he's "adding wedge", Corner weighting can be a complicated process for you to complete without someone who is experienced helping you. The height of the rear roll center (and the front also) is critical to handling. For pure race cars this isnt a consideration. Delta is equal to (Right Ideal weight percentages: Front - 43-45% Left - 53-56% Cross - 52-54% What do these numbers mean? important for oval racers, especially on dirt ovals. 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. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. Bite = Left Rear - Right Rear and a positive value means the Get the numbers right and the percentages will follow. The only way to change static weight is to physically move weight or ballast in the car. height and the shocks set to the exact same spring perch height if you have any of the scales connected improperly (i.e. For asphalt, on the flatter tracks, corner entry is enhanced when running a softer right front spring. That math gives us a percentage number to . I was booked for 100 laps split across four or five sessions. Oval Record each spring rate. My starting cross weight was 50.6%, I was off 7lbs In the example at the beginning of the article, this was the problem: a cross-weight percentage that was less than 50 percent, and probably off by at least two percent. Road racers are 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. I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. Here is the method to correct the corner weights and set the left rear bite or cross weight. Or maybe I read the post wrong. This is for a race prepped 1984 Audi 4000 quattro(2375lbs. There are legal issues too at the front. Afterward you need to adjust the settings to the correct maneuvers. stiff springs on your coil overs. I plugged in a bunch of numbers into my calculator and it all checks out. Now that's pretty cool! Basically - after you finish the set up routine, the car goes in the hauler. spring perch so I left my jacks in place between lifts and only put two lug nuts The CG height 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. 8 Read the ride heights as they exist. Jun 7, 2018 #5 . I . tires. to balance your car in one big step. [Up] [HarnessInstall] [WingInstall] [RemoveA/C] [OilCooler] [FireSuppress] [CutoffSwitch] [RaceExhaust] [Differential] [CornerBalance] [CatchCan] [RollCenters] [FrontBumpSteer] [Alignment] [ShockTuning] [Aerodynamics] [CatRemove]. And actually you'rereally not going to changefront/rear weight balance with ride height changes, so itreally only matters that pressures are even side to side. You can estimate your car's center of gravity For our example, we need to go from 49.8 to 54 percent. Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. Once the corner what he means is he's adding weight to the left rear and right front Then there is what I do for FWD stuff That is forget the rear weights entirely, and just balance the fronts to be equal. 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?