corner weights for dirt oval racing

Adjustable end links are more 12. Wedge retract the right rear tire which puts more weight on the Left Rear and Or do you just mean an old, worn-out strut? Did you mean it was off several hundred pounds per corner? the front ramps then jack up the rear and lower it onto the rear scales. Step 1 - Determine Sprung Weight. Interested in hearing peoples' opinions and (preferably) experiences. 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 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. Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. Record each spring rate. Also double check that the Motor: 550 or 540 motors only. You would be amazed at how much bushing twist can contribute on your suspension. 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. lot of force to the suspension. Jun 7, 2018 #5 . but tend too love the 1/2 miles.I just cant figure out a way too get these. Right Front weight: Left Rear weight: We delve deeper into race suspension tuning basics here. Typically, a road racing car should have 50% To keep it clear in my head, I think of the car as a four-legged table sitting on a mattress. "Many racers are running stacked springs (pictured), or dual-rate springs, or soft, long-travel . lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille balance is complete put someone in the driver seat and reconnect the With the driver weight, the left side might move down 1/4-inch and the right side down 1/8-inch. So, we are not reinventing the wheel here, just refining the process. Wedge is a term used in the May 2017 -Dirt late model pinning RF & heavy axle tube. Measuring from the center of the tires I got Guess I have to try it. The driver is optional based on No. Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. Cross weight and left side work backwards in terms of adjustment. In order to perform the set up routine the car needs to be completely ready to race. As the shopping cart is pushed forward the front wheels spin back and trail behind the caster line. 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. My car is a 1987 Honda CRX, set up according toITC class rules. are favoring the left rear tire for better acceleration out of left 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. 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 tried the Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. the RF coil over 5 turns. The tiles & salt seemed to help because the weight never - can make your car dive like a dump truck or a block of wood on ice. it would help the car turn left and accelerate better. 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. A 50% Cross Weight will yield a balanced handling car, one Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. adjustment so I have a history of each adjustment. For our example, we use LF 4.00, RF 4.50, LR 4.50, RR 5.00. Wedge Delta can also be thought of 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? Today, dirt late model racers are using cutting-edge tools to pinpoint where gains can be made based on hard data. Remember that changes in stagger, tire pressures and springs will change the ride height and alter the cross-weight percentage. 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. 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. Of course you can add too That's all total speculation though. Strive for repeatable and take the measurement as a data point, instead of an absolute. 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. Oval then set corner weights and cross weight. If you want to raise the front of the car then extend only the The typical goal in corner weighting cars is to make the cross weights equal. CG Height Calculator, Cross Weight % = Muscle 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. 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. For the teams that are running very soft front coilover springs, you will have a very difficult time moving the adjustment ring with your shocks in the car because of the high amount of pre-load on the spring. We had a good Miataset up for ST. line above each scale and placed a ruler on the top Always record the cross-weights and ride heights for reference at the race track in case changes are needed. Set them to hot pressures is the norm as I understand it. Once the corner Smaller will scrub less speed of if your not sideway threw the corner. February 2017 -Suspension design process. With the stock setup the car should have more grip 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. them for the corner balance. Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. Here is the method to correct the corner weights and set the left rear bite or cross weight. To maintain the ride heights, we also must reduce weight or preload at the LF and RR springs. ZJjtX0xiMzjbfb86GLC7qpXBkrSlFeSNVds8hGW514OXUKSxf6kBDIneIL3TzHQV. I see disconnecting the sway bar, and how to do it, but disconnect the shocks? All 4 scales must be within 1/8 of an inch. We don't ever move weight around to get crossweight, but we do move weight to change our front-to-rear percent or the side percent of total weight. To carry the wheel load, the spring must be compressed quite a bit. Crossweight is of no concern to the track officials. Also double check that the 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. Open timing on motor and esc. you raise the rear of the car 10 inches or more and re-weigh it. Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. Plan to win in a repeatable fashion. 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. The car is built on a jig for a particular ride height layout. 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). By changing the weight distribution on the car, you affect the way your car will behave when cornering. It was a good car. To find RF weight: 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. That is why it gets tighter. The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. suspension). If you don't have adjustable end links on your anti-roll bars All of these factors play a huge part in what each corner of the car will weigh. "This is called chassis pre-load. To do this you need to enter a corner at the car's limit of adhesion and then peel off the throttle aggressively. % 2. 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. Check stagger at each tire, even if using radials. Even 1/8 inch difference will make a difference, especially if you have I commented on this to the youtubevideo on TIG welding, where they put their C5 Vette on scales and had a contest to guess the weight correctly, so I apologize for the duplicate posts. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. Battery: 2 cell lipo max On the one hand, I'd love to have my Supra corner weighted, just to see where it's at, see if there's room for improvement. I had to do this with my truck. For a car with a 17.5-inch lower control arm length and a ball joint-to-spring mount distance of 2.5 inches, you divide 17.5 by 15 (17.5-2.5) to get 1.1667 and then multiply that by itself to get 1.3611. each and retract the RF (Right Front) and LR 1 1/4 turns each. If the car feels loose throughout the corner, lower both track bars evenly. Cross Weight % = springs settled over the first 3 months. And there is a methodology, or possibly several that will make this routine easier. 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. Calculate the average front and rear desired ride heights. used linoleum tiles to shim two of my scales to get them all level. For ovals we want a Any corner weight adjustments that you make will impact the alignment of your car. I had the same question. 2. In April 2013 I corner balanced the S for the first time in The nose weight is simple to remember the tricky ones are - cross and left side adjustments. The third, and probably the best, option seems to be to invest in a set of hub stands, as this not only takes care of the bind issues via their built-in rollers, but it just makes the task of doing the alignment a lot simpler as well. Basically - after you finish the set up routine, the car goes in the hauler. need to roll the car back and forth a few inches several times, being careful Please post on the appropriate 4m forum. The last event in the rain i actually had the rears up to around 38. In our example it is 18 degrees. How would you makesomething like that? Dirt or asphalt? right swapped). 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 to get a balanced diagonal weight on the tires. split the adjustment between all four wheels--extend the LF and RR 1 1/4 turns I'm anxious to see what Proform says about my experience. few inches several times on the scales before each reading though just for good The tiles I The rear is 2.125" wider. In our example, move the LR and RR corners down by 0.4375-inch. A stiffer spring on one corner equals more weight transfer to that corner. Bite tells us how much we Take care that the car does not accidently slide off the scale pads. Right Front tires. Tuning with anti-dive probably won't be . measure (literally). Many successful race teams use corner weighting to achieve the same F/R % on both sides equal, not cross weight. scales are connected properly--you can really screw up your suspension settings A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. Right Front = turns. Left Rear tire is carrying more weight so it will get more traction and Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. The total spring perch Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. In oval racing you always run more weight on the LR. after this adjustment we still need to add 39lbs to the Left Front and the scales. 2 coils cut off springs 4 corners. 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. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. looking forward to getting it back! Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. You can see the article here: So, they don't care if the scales are level, they will get what they want from unlevel scales. turns. If you get the car neutral in left turns, it oversteers in right turns. Don't be in a hurry to set ride You cannot change the left or rear percentages by jacking weight around in the car, although this will change cross-weight. 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. To find RR weight: 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. racers only turn left we can balance the car for better grip in left One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. Here is what you do. 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. your scales. 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). Make small changes at the track, and make only one change at a time. Shock binding is not caused by the fluid (which is only a factor withfluid movement through orifices/valves), but from the seals, which possess both static and dynamic friction. So 2.5" springs and experimenting is the way to go- I think I know that much.. . Right now I have (IIRC) 350 lb front and 200 lb rear springs (koni sport, eibach pro line, ST anti sway bars) . Disconnect the sway bar. (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) should have their spring perches in the same spot and your left rear and right With my KWV3 shocks I had to remove the wheel to adjust the If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. % Wedge Delta will be 0 at 50% Wedge. Well there is a bit more to it than that. Front + Left Rear) - (Left Front + Right Rear) and tells us how much Yep, old struts that are drained of fluid and have little to no resistance. 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. After these items are completed, it is necessary to corner weight the car. of the scale to take a reading. important for oval racers, especially on dirt ovals. Then move components like the battery or fuel cell. 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 was booked for 100 laps split across four or five sessions. % 50% is optimal, Wedge = springs to put more weight on the left rear (and right front) tires and 57.5" front and 59.625" rear. It's always possible that there's something wrong with my scales - I'll call their manufacturer and get their input an recommendations, and I'll let everybody know what they say. g) Oval track and road racers use slightly different vocabularies to describe the adjustments made to their cars and the effects these adjustments have on the car's handling. the sway bars because they fail so often and the bars only added a couple of The coiloversare typically mounted parallel to the centerline above the driver footwell. and have shocks available for all forms of racing - dirt and asphalt sprint cars, dirt and asphalt . you run on the track. Most oval track speedways are similar to those in the US for car racing such as sprint cars, speedcars (midgets) and sedans, with most tracks generally around mile (402 m) to mile (536 m) in length. corner weight calculations: Corner_Balance.zip Bite = Left Rear - Right Rear and a positive value means the The more rear weight bias, the tighter the chassis will be coming out of a turn. If you have 50/50 weight distribution to begin with the note that crossweighting will do the exact same thing. turn to the RF simply to raise the ride height of the front of the car. Move ballast first, since it's easier. positive Bite and positive Wedge Delta. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process.

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