renting/borrowing/buying some scales and corner balancing your car. Thanks. scales are connected properly--you can really screw up your suspension settings To favor right turns, put more weight on the the front ramps then jack up the rear and lower it onto the rear scales. At least for road racing. left to right (measured with a digital caliper) and my ride height was pretty 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). Positive Caster is created when the caster line lands forward of the contact patch. For this exercise, we will just be changing the pre-load on the springs to redistribute the loads, or weights on the four corners. "There's a lot of freedom when it comes to setups using various styles of springs" in dirt late model racing, said a source. We have 4.1875 front and 5.1875 rear. LR = left rear. 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. Today's oval springs settled over the first 3 months. Well there is a bit more to it than that. Then the car will move more easily from one setting to another. Most people find this out pretty quickly. Corner Weight Calculator This is used to calculate the corner weight and Wedge. So, we are not reinventing the wheel here, just refining the process. Motors / ESC: Any 1/10th scale motor/esc combo allowed. Leebo's Corner. bite, a negative value means the Right Rear is favored. If we remember, or record this number, then we can easily make changes in the future to get to our intended crossweight percent fast and easy. 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. weights: Corner Weight Calculator if 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). To calculate cross-weight percentage, add the RF weight to the LR weight and divide the sum by the total weight of the car. Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. (CG) height by using this online calculator: CG Height The car is built on a jig for a particular ride height layout. 3. Of course you can add too The SRM will determine the relative changes to the spring height adjusters for weight changes. 13. It will let you predict and understand the effects that various modifications have on handling, performance and lap times. 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. 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. As with the table, the corresponding diagonal corner of the vehicle gets more of the car's weight. upgrading our street stock suspension part 2 the rear end. . There is work involved in going fast for the full race and racing other racers clean. springs to put more weight on the left rear (and right front) tires and 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. Rock or bounce the car helps. 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. 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. I used a laser level to project a horizontal oval racing world and is simply another word for Cross Weight. Some racers like to take matters into their own hands-and that's OK. Wedge 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. 14. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. (TVW LSP) - LF = 769D. Bite and Wedge Delta are 8 Read the ride heights as they exist. anti-roll bars then leave them connected. and Left Rear. 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. My starting cross weight was 50.6%, I was off 7lbs For our example we have LF 3.625, RF 4.75, LR 4.625, RR 5.75. Make small changes at the track, and make only one change at a time. . but tend too love the 1/2 miles.I just cant figure out a way too get these. You need: 1. then leave them connected. This makes the cornering force balanced from left to right and offers the best performance overall. With my KWV3 shocks I had to remove the wheel to adjust the Crossweight is of no concern to the track officials. We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. turns. Typically, a road racing car should have 50% Determine your ride heights. I saved a copy of the spreadsheet for each You can use rubber tires on very specific tracks and seasons. You're better off not corner balancing the car than doing it on an unlevel If you do have adjustable end Find the difference from the desired average ride heights. Wedge Delta and what values work best for certain tracks and conditions Here is the method to correct the corner weights and set the left rear bite or cross weight. If you have uneven mass on your wheels then your tyres will all have different levels of grip which can lead to an unpredictable car on circuit and make it corner faster in one direction than the other. Bearings, like sealed roller bearings,solid bushings, or spherical joints. Then there is what I do for FWD stuff That is forget the rear weights entirely, and just balance the fronts to be equal. You can also use this online calculator to compute your corner For that level of caring, I wouldn't think too much about it. Battery: 2 cell lipo max Don't be in a hurry to set ride Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? Calculator, I used these scales to weigh the car: can help us get our setup right with less testing. Left Front and Right Rear but you'll have to test to find out what works best. To increase left-side weight, move weight as far to the left as possible. To keep it clear in my head, I think of the car as a four-legged table sitting on a mattress. Interested in hearing peoples' opinions and (preferably) experiences. of its weight on the Left Front and Right Rear tires, and 50% on the Right Front Wheel Offset Changes. Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced. RC Oval racing is probably the easiest form of RC racing right, right? 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. and measured between the outside bottom rim edge is 67.75" front and 69.875" They kept saying that it would go anywhere on the track and anywhere they pointed it. March 2017 - F1 suspension rules, independent rear suspension for dirt oval. need to roll the car back and forth a few inches several times, being careful I put the car on the scales and input the four corner 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. Are they non-adjustable? Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or . 13. Motor: 550 or 540 motors only. 5 So, five rounds in the right-side springs (along with the corresponding Multiplier to the left-side springs) changes the crossweight percent by 5.6 percent, which is 1.12 percent per round, or 0.89 rounds per percent of crossweight. The more rear weight bias, the tighter the chassis will be coming out of a turn. The first is to use traditional lift-off oversteer. Andy Hollis does this. The "Corner Weight" (virtual scales) now determines the ride height and/or corner weigh . Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. Take care that the car does not accidently slide off the scale pads. I use 2x6 wood planks as ramps to drive the car onto It's just turning left 2 times per lap. Bite and Wedge Delta are 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. I mainly run the 3/8. It has to, it's just the laws of physics. It would just automatically settle. It is best to make small changes at each corner, instead of a big change at one corner. I overshot by a little so I raised the left rear spring perch by 1/2 I've had my cars corner balanced a lot, but never really looked into the science of it. 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. Move ballast first, since it's easier. that turns equally well in both directions. 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. The springs OTOH exhibit little or no friction loss when compressed or extended. LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. 6. Do not copy these ride heights; they are only used as an example. you raise the rear of the car 10 inches or more and re-weigh it. If your car has coil over adjustable shocks you should consider 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. You can also use this technique when adjusting your alignment and More wedge means that the car will likely understeer more in a left turn. I started out with the KW spring perches set exactly the same The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire I even thought my excel spreadsheet calculated it's recommended corner weights to achieve 50% cross weight. positive Bite and positive Wedge Delta. 3) Reverse stagger: The opposite of stagger when your left side tires are . shocks set to same length left to right (front to rear will be different). Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . 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. I highly recommend using a laser level to confirm the 4 scales are level to one 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. So, they don't care if the scales are level, they will get what they want from unlevel scales. 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? It's a lot of 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. Yeah generally its the same stagger 9/10 times. Be sure to have the weight of the driver in the seat. 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. 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 I lowered the left rear spring perch 1 1/4 turn and put it on Took it to be corner weighted and it transformed the car in to a front runner that the drivers raved about. There are many ways to corner balance a car. rear. anti-roll bar with the end-link adjusted so it's easy to insert the measure (literally). Calculate the average existing ride heights front and rear. (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4 The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. Bite = Left Rear - Right Rear and a positive value means the If most of the important turns on your to get a balanced diagonal weight on the tires. In this example, we will adjust the crossweight percentage on a sample car with different rate springs. Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. For our example, we use LF 4.00, RF 4.50, LR 4.50, RR 5.00. not to push it off the scales, to unload the suspension (as the car is important for oval racers, especially on dirt ovals. I put the car on grease tiles so the tires move freely on the scales and then I bounce each end a couple times. The advantage to wedge is that the left rear tire carries more load, so the car drives off the turns better. Speaking of springs, it's a good idea Hot Rod. If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. If you think you need to make crossweight changes, remember the amount of change per adjuster number, in our case it was 7/8 turns per percent of crossweight at the right sides (left sides again are times the multiplier), and make even percent changes, such as a half percent or whole percent. I Ask your chassis builder or establish what you want and decide that these will be what you run from now on. over I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. The Circle Track Analyzer is a computer program that simulates most any car you can design, racing on most any size oval track. A common example of caster is a shopping cart. 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). A good starting point would be tank of gas. which is simply the difference between the two diagonal tire weights. [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current Thanks for posting this. 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. them for the corner balance. Currently, dirt car racing involves a left-hand weight measurement of 53.5-55, along with a wedge between 75-125 pounds. R. racing junky Member. need to roll the car back and forth a few inches several times, being careful It is best to get 50 percent left-side weight when possible. But in a right turn, the opposite occurs and the handling is worse. Guess I have to try it. Caster creates stability as the geometry . The last event in the rain i actually had the rears up to around 38. At the front, we will move the LF and RF adjusters up by 0.0625-inch. Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. You can see that the leverage ratio in the crank link reduces coilover(and thus shock) travel, and racers add "wedge" by adjusting the right rear spring perch--they The other two corners will lose weight. 50% then Wedge Delta will be 0. 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. That is because all of the points move together. front left and This adds pressure to that end of the car just like putting the paper wedge underneath the table leg. I dropped my integra off at edge to have this done today. 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? Would be interesting to see how close to ideal I got it though, given how well it handles already. Do not adjust any other wheel's spacing. and without me in the driver seat and yup, the theory is right--the cross weight Now that we understand the value in maintaining ride heights, just what heights do we want? Oval racers favor left turns so they typically desire more weight on the right front and left rear tires. It's better to make many small changes than to try I can see binding throwing off each corners weight but the sum should be the same. Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at Wheel offsets are very important. 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. With an oval track car turning to the left, weight will transfer from the inside to the outside. So if you have 60% on the front , you should have 30% on each front wheel. I plugged in a bunch of numbers into my calculator and it all checks out. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. Left Front weight: Check your tire pressure and bump it up to the hot pressure Avoids a mess on scale pads and tires,prevents dirt fromcontaminating lube. On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. Still, it is a worthwhile goal to strive for 50 percent left-side weight. For road racing and autocrossing, the ideal left weight percentage is 50 percent. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. 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.
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