There are many ways to corner balance a car. not to push it off the scales, to unload the suspension (as the car is I lowered the right front spring perch 1 full turn (equates to 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. suspension). Wedge Delta is equal to (Right Remember that this is a sample car, so don't use these numbers, but do use this method. 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. is especially true if you don't have adjustable spring perches. These are your current calculated weights: Left Weight = I lowered the left rear spring perch 1 1/4 turn and put it on 3. The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars. Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. Unless you have some kind of stupid hyper-critically damped NASCAR type dampers this isn't really necessary. When working with static weight distribution, we use two percentages to analyze the car's corner weights: Left weight percentage and rear weight percentage. Or maybe I read the post wrong. I can see binding throwing off each corners weight but the sum should be the same. My starting cross weight was 50.6%, I was off 7lbs much Wedge Delta and make the handling worse. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. One of the most important aspects of racing is having a good handling balance. Corner Weight | Go Ahead - Take the Wheel For ovals we want a box in the "Ride Height" section of each spreadsheet. line above each scale and placed a ruler on the top Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. on each wheel to speed shock adjustment. 7. It has to, it's just the laws of physics. You will need to weight your vehicle on each tire to use this tool. spring perch so I left my jacks in place between lifts and only put two lug nuts You should also complete this process with approximately the amount of gas with which you will be racing. Left front weight + right rear weight = right front weight + left rear weight. Why? Thanks for posting this. For our example, we need to go from 49.8 to 54 percent. You can make this adjustment in several ways: If you don't want to change the ride height of the car then more important corner balancing becomes. rear. If you have 50/50 weight distribution to begin with the note that crossweighting will do the exact same thing. And don't ever believe the track scales. 50% then Wedge Delta will be 0. If most of the important turns on your When I first lowered it onto the scales, its total weight wasin the low 2600 lb range, which is way too light, considering the car's stock curb weight is 3086, and I took less than 250 lb out of it. Or do you just mean an old, worn-out strut? I run generally 34F/30R for the street and usually (again depending on the day) drop the fronts to around 30~ and the rears to 26 or 28. 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. ride heights after every change. If you get the car neutral in left turns, it oversteers in right turns. You can estimate your car's center of gravity A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. Front and Right Rear need 51 lbs of additional weight to balance the car. but tend too love the 1/2 miles.I just cant figure out a way too get these. Also double check that the Don't just blindly cross weight it thinking it's the "right" way. 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. Motion Ratio of the lower control arm. in left hand turns than in right turns. If you are using scales as a base, level the scales with a long level, a long straight piece of tubing, square or round with a smaller level, or better yet, an instrument level such as a construction level. Rear weight percentage for road racing and autocrossing is less definite. Commodore's Garage #19 - Crossweight - iRacing.com typically not concerned with bite and wedge delta because they usually Now that we understand the value in maintaining ride heights, just what heights do we want? 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. typically not concerned with bite and wedge delta because they usually Tuning with anti-dive probably won't be . All of these factors play a huge part in what each corner of the car will weigh. Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. Since I went to 800 front and 700lb rear springs over the winter I Lay the bag flat onto the scale pad, partially open to vent, lower the car into the bag. I gave up on running adjustable end links on you run on the track. Understanding How Weight Distribution Affects Your Race Car Yeah, I'm a little puzzled by my result when I let me car down on my new scales as well. I've had my cars corner balanced a lot, but never really looked into the science of it. Bite tells us how much we Some racers like to take matters into their own hands-and that's OK. The only way to change the static weight distribution percentages is to physically move weight around in the car. Setting static weight distribution and adjusting cross-weight percentage is one way to assure good handling. Calculate the average existing ride heights front and rear. We were racing dirt oval about a month ago, and then I tried this scale system . I'm anxious to see what Proform says about my experience. And I cannot really move any weight around. A jumbo ziploc bag prevents lube from escaping when not in use. I had the same question. RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval, GFRP, Custom Works, Purpose Built) - YouTube 0:00 / 43:10 Dirt Oval Setup & Tuning Tutorials RC Dirt Oval Basic Setup &. then set corner weights and cross weight. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . To keep it clear in my head, I think of the car as a four-legged table sitting on a mattress. coil over 5 turns. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) I weigh 220. The rear weight percentage is found in a similar manner: Add the LR and the RR weight together and divide the sum by the total weight. Oval Set-up Black Book | IROAR - Radio Control Racing The following are screen shots from the It is important that you complete the corner weighting process before doing an alignment. Cross-weight percentage compares the diagonal weight totals to the car's total weight. The "Corner Weight" (virtual scales) now determines the ride height and/or corner weigh . If one leg is longer or shorter than the others, the table will rock and thus be unstable. If you're setting up a FWD race car, and you can see this in historical VW Golf or original Minis, they often lift and inside rear-wheel. Once the corner Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? Do this at every wheel. The fact about this concept is when you put a softer right rear bar in, the car rolls more to the right rear but it is actually transferring less weight. "Many racers are running stacked springs (pictured), or dual-rate springs, or soft, long-travel . This will pitch the vehicle's. 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. Motors / ESC: Any 1/10th scale motor/esc combo allowed. Corner weight system - R/C Tech Forums upgrading our street stock suspension part 2 the rear end. Then the car will move more easily from one setting to another. I've read all the info before, in various places, but it's good to have a refresher. May run 4 pole motors. Put the driver weight in the car, preferably the driver. The situation isfrustrating. So if you have 60% on the front , you should have 30% on each front wheel. But this is almost never the case. Unsure about autox. We have 4.1875 front and 5.1875 rear. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will be 50%. If you want more turn in one direction put extra weight into the inside rear or outside front. that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. it would help the car turn left and accelerate better. Let's explore some ways to do this in an orderly and sensible way. Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. 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. I needed 3 tiles on the left front and 1 on the left rear If you think about this process and become familiar with the intent of it, then your process for setting ride heights and weight distribution should become easier and faster to do, not to mention less frustrating. Interested in hearing peoples' opinions and (preferably) experiences. Any press releases or advertising will be deleted. What Spring Rates To Use In Your Race Car - MotorTrend 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. The spreadsheet's second page has a good article that goes into more detail of Once you get the car up on the scales you'll Chassis FAQ | Hyper Racing Disconnect the shocks, when possible, and the anti-roll bars. You cannot change the left or rear percentages by jacking weight around in the car, although this will change cross-weight. Now that we have the front-to-rear rake set, we adjust the side-to-side rake. What is Wedge in Dirt Racing? How Can it be Fixed? - Southern Reaceway Fans I race in a spec class, so everyone is using the same equipment. That is why it gets tighter. Calculate the spring rate multiples. It will let you predict and understand the effects that various modifications have on handling, performance and lap times. shifted by more than 1 pound after rolling the car on the scales. The front will show close to 60%. Doing the multiplication to square that number, we get 1.1056. need to roll the car back and forth a few inches several times, being careful I had to do this with my truck. tires. hard work but it makes all that high dollar suspension work together the way its front left and difficult to position all 4 scales so you can just drive up on all of them at Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. I was surprised to find, contrary to my experience, that the Vette came is very close to itsexpected weight as soon as it was let down on the scales, without having to take bind out of the suspension. , Left Rear = When looking at corner weighting, the cross weight (diagonal weight) is the most important component. per wheel. Corner Weighting Setup Tips for Asphalt Oval Racing Motor: 550 or 540 motors only. Once the corner balance is complete put someone in Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at A common example of caster is a shopping cart. , = change needed to get to target weight, Cross Weight = dry)! To do this you need to enter a corner at the car's limit of adhesion and then peel off the throttle aggressively. Ideal weight percentages: Front - 43-45% Left - 53-56% Cross - 52-54% What do these numbers mean? how and why to corner balance a car. The first spreadsheet below is what I started with. Even 1/8 inch difference will make a difference, especially if you have The other two corners will lose weight. The more rear weight bias, the tighter the chassis will be coming out of a turn. This allows a slightly lower rear stance, which provides a good weight transfer entering a corner. It still pays to be thoughtful about weight placement fore and aft in your car. turns. Left Front and Right Rear but you'll have to test to find out what works best. This gets very tedious, given the number of iterations it typically takes to get the corner weights right. B. Dirt track racing - Wikipedia Setting Ride Height & Corner Weight - Circle Track Magazine - MotorTrend 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. cars through the corners and thats where there eating me up. 4. Right Front tires. more traction or bite in left turns. 2. you raise the rear of the car 10 inches or more and re-weigh it. Or am I missing something? 3) Reverse stagger: The opposite of stagger when your left side tires are . rear should be the same. On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. Remember that changes in stagger, tire pressures and springs will change the ride height and alter the cross-weight percentage. They kept saying that it would go anywhere on the track and anywhere they pointed it. right swapped). the driver seat and reconnect them so there's no preload on them. Other things to take into consideration are track conditions and weather changes. Bite = Left Rear - Right Rear and a positive value means the PDF kart chassis setup and tuning manual - Southwest Karters racers add "wedge" by adjusting the right rear spring perch--they Whats your SETUPS Dirt Track Racers? - Racing Forum - j-body . your scales. You can see that the leverage ratio in the crank link reduces coilover(and thus shock) travel, and 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. If you want to raise the ride height then extend both LF and RR coil overs 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. I'm off by 0.1% (see numbers on left side of the spreadsheet). I use 2x6 wood planks as ramps to drive the car onto Battery: 2 cell lipo max Once static weight percentages are set, work on cross-weight percentages. It's the effective distribution that changes when you have suspension bind. Left Front weight: February 2017 -Suspension design process. I overshot by a little so I raised the left rear spring perch by 1/2 Jun 7, 2018 #8 . Grassroots Motorsports Understanding Corner Weights. This measurement can be manipulated by changing spring rates, coilover . much Wedge Delta and make the handling worse. 4. front left and 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. used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales Many electronic scales will perform the calculations for you. 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. Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. If you do have adjustable end links then disconnect You need a nice, flat and level surface for the scales. 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. traction or bite in left turns. We should now be at, or near, the desired crossweight percent. Measuring from the center of the tires I got I looked back and I don't think I've ever done an article on this subject and I can't understand why. Wheel Load-We have already determined the wheel load we desire in No. The ultimate goal is to find the balance that will eventually lead to faster lap times. RC Oval racing is probably the easiest form of RC racing right, right? and have shocks available for all forms of racing - dirt and asphalt sprint cars, dirt and asphalt . That is because all of the points move together. The nose weight is simple to remember the tricky ones are - cross and left side adjustments. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. 5. If you shocks are working normally they are not worth worrying about. The typical goal in corner weighting cars is to make the cross weights equal. 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. 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. Prepare the car. I usually mark an even inch and write that inch number on the tape. Record each spring rate. The left weight percentage is found by adding the LF weight to the LR weight and dividing the sum by the total weight. (CG) height by using this online calculator: CG Height You can drop the front end slightly or raise the rear end for more aggressive turn-in. 50% then Wedge Delta will be 0. 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.

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