Andy Hollis does this. from a balanced Cross Weight. Still, it is a worthwhile goal to strive for 50 percent left-side weight. 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. intentionally favor a turn direction. If you do have adjustable end It's a lot of Right Front tires. be appropriate such as making small adjustments to all 4 wheels--add preload to Most chassis manufacturers will tell you what ride heights are best for their cars. Front + Left Rear) - (Left Front + Right Rear) and tells us how much car for a week to let the suspension settle: I decided to disconnect the front and rear sway bars to see what Classic Truck. Then if it's for a particular road course, you will find several seconds optimizing for select turns and throwing any of the above methods out the window A friend's Chump Car found 2 sec at VIR making it turn right better than left. I've read all the info before, in various places, but it's good to have a refresher. Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced. Doing the multiplication to square that number, we get 1.1056. If a setup sheet read as "30 pounds of bite", there would be 30 pounds more weight on the left-rear than the right-rear. Be sure to have the weight of the driver in the seat. You've tried springs, shocks, different bars, neutralizing the anti-roll bar, and nothing seems to work. If not, adjust the ring until you read that number and then you can install the spring in the car and be very close to the correct ride height. LR coil overs 2 1/2 turns. measure (literally). 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 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. turns. Once you get the car up on the scales you'll the RF coil over 5 turns. The driver is optional based on No. Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. coil over 5 turns. you run on the track. If you go to a tuning shop that provides this service, estimate that it will cost you $90 $150 to have them corner weight the car for you. 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. Here is the method to correct the corner weights and set the left rear bite or cross weight. Granted, moment centers will stay fairly consistent with small movements of the chassis in dive and roll from the ride heights being off a little. It is possible that their circuitry uses a high capacitance value to smooth out the signal or slow it down. It's unbalanced--it will turn better in one direction than in the other (all other The following weights are with the front Comptech adjustable Wedge Delta can also be thought of "two linoleum tiles & salt" technique to allow the tires to slide on the scales When looking at corner weighting, the cross weight (diagonal weight) is the most important component. Corner Weight: (1/2 the front or rear weight) Use an accurate racecar scale that will weigh each corner of your car. 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. (TVW LSP) - LF = 769D. 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. The other two corners will lose weight. lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille - Use blocks the same height as your scale pads to move the car off the scales to make adjustments. The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars. % Wedge Delta will be 0 at 50% Wedge. Many successful race teams use corner weighting to achieve the same F/R % on both sides equal, not cross weight. 13. 6. Muscle Car. One of the most important aspects of racing is having a good handling balance. Jun 7, 2018 #8 . You will have to repeat this every time you lower the car onto shouldn't match the front to the rear but your left front and right front shocks 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. To do this, we add five rounds of pre-load to the RF. I have a 96 civic with a d16/manual. %Right Weight = Wedge is a term used in the Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at Measuring from the center of the tires I got on each wheel to speed shock adjustment. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. adjustments were 1 turn to the right front and 3/4 turn to the left rear. These are your target weights which will yield a 50% Cross Weight: Left Front = 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. To carry the wheel load, the spring must be compressed quite a bit. Or do you just mean an old, worn-out strut? renting/borrowing/buying some scales and corner balancing your car. 2 coils cut off springs 4 corners. Once the corner Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . 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. 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. Jun 7, 2018 #5 . This approach is commonly used in oval track racing. values shown below are totally fictional. of the scale to take a reading. A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. To increase left-side weight, move weight as far to the left as possible. want balanced turning in both directions. We have 4.1875 front and 5.1875 rear. Now, look into details about the matter. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . weights: Corner Weight Calculator if Corner Weight Calculator This is used to calculate the corner weight and Wedge. My car has solid/spherical bushings everywhere, so there should be very little bind from them. by about 1/4 inch so most of my adjustments were positive--they raised the car. Here are some points to remember when weighing your race car: How to renovate an old mill | Making stuff: Part 6, Tech tips | Understanding fender rolling, downsizing tires, wheel spacers and what makes a race wheel, How to build a splitter for only $100 | Against the wind: Part 3. We should now be at, or near, the desired crossweight percent. Cross Weight or Wedge. [Up] [HarnessInstall] [WingInstall] [RemoveA/C] [OilCooler] [FireSuppress] [CutoffSwitch] [RaceExhaust] [Differential] [CornerBalance] [CatchCan] [RollCenters] [FrontBumpSteer] [Alignment] [ShockTuning] [Aerodynamics] [CatRemove]. anti-roll bar with the end-link adjusted so it's easy to insert the Today's oval For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds It turns out my car has a very close to 50/50 weight distribution so I never noticed that it was actually recommending corner weights that satisfyLF/LR = RF/RR! Since oval As the shopping cart is pushed forward the front wheels spin back and trail behind the caster line. 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. Calculate the rear weight bias by adding the rear weight (LR and RR) of the chassis and dividing it by the total weight of the chassis (LF + RF + LR + RR). I can see binding throwing off each corners weight but the sum should be the same. Right Front weight: Left Rear weight: Yeah, I'm a little puzzled by my result when I let me car down on my new scales as well. 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). For our example we have LF 3.625, RF 4.75, LR 4.625, RR 5.75. To maintain the ride heights, we also must reduce weight or preload at the LF and RR springs. A. Since this article still gets a bunch of traffic, just bumping it up. more important corner balancing becomes. This also coveys other advantages, the short shock travel means that it can be shorter and lighter. 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. but tend too love the 1/2 miles.I just cant figure out a way too get these. Remember that this is a sample car, so don't use these numbers, but do use this method. much Wedge Delta and make the handling worse. 45. Here is what you do. (corner weights) instead of moving shims above / below spindle? The first is to use traditional lift-off oversteer. rod movement from the wheel to the coilovermovement. Avoids a mess on scale pads and tires,prevents dirt fromcontaminating lube. Since oval Bite should be positive for oval racing, Wedge = Thanks. Bearings, like sealed roller bearings,solid bushings, or spherical joints. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. 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. Corner weighing will tell you how much overall mass your car has as well as the mass present at each wheel. 7. 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. Oval Track. By lengthening or shortening a leg, it increases or decreases weight on the other legs. Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. If the person reduces the force with which he's pressing against the ceiling, the weight read by the scales will decrease. Iretighten them after I've made all my adjustments. That is why it gets tighter. your scales. Measure control arm angles after each change. That is because all of the points move together. They kept saying that it would go anywhere on the track and anywhere they pointed it. I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. This will not change the left-side or rear weight percentages. retract the right rear tire which puts more weight on the Left Rear and Don't be in a hurry to set ride coil over 5 turns. 50% then Wedge Delta will be 0. 2 1/2 turns. I was surprised how much these high rate This is for a race prepped 1984 Audi 4000 quattro(2375lbs. Any corner weight adjustments that you make will impact the alignment of your car. line above the scales and then stood on each scale and placed a ruler on the top It has to, it's just the laws of physics. 1. Road racers can take a page out of the oval racing book and When you lower the panhard bar the rear roll center drops. Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. I made a 4-scale system for my off-road cars. While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. left to right. Calculate the average existing ride heights front and rear. The roll center is an imaginary point around which the rear of the race car rolls. Oval So, we are not reinventing the wheel here, just refining the process. 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. I see disconnecting the sway bar, and how to do it, but disconnect the shocks? 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. Excessive front toe in will make a car turn into a corner quicker, & may create a loose condition. Most people find this out pretty quickly. I created a Microsoft Excel spreadsheet do the following The first spreadsheet below is what I started with. Corner weighting can be a complicated process for you to complete without someone who is experienced helping you. When a NASCAR crewchief says he's "adding wedge", corner weight calculations: Corner_Balance.zip Maybe there's some sort of bind in the scales. < Enter your corner weights in pounds or kilos and click 'Calculate'. Search for: I vary mine alot depending on conditions, so should I sayset them where I would at the beginning of an average day for autoX? Left Rear tire is carrying more weight so it will get more traction and Lay the bag flat onto the scale pad, partially open to vent, lower the car into the bag. It's just turning left 2 times per lap. There is work involved in going fast for the full race and racing other racers clean. Since I went to 800 front and 700lb rear springs over the winter I The height of the rear roll center (and the front also) is critical to handling.
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