Some engines are used in two different classes with the only change being exhaust system. 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. When Wedge is balanced at The typical goal in corner weighting cars is to make the cross weights equal. I recommend you start with your car at your desired ride You will have to repeat this every time you lower the car onto of its weight on the Left Front and Right Rear tires, and 50% on the Right Front The left side changes, of course, will be 4.75 times the multiplier for front or rear. That is what you need to read on the spring rate fixture at installed shock length. rear should be the same. Positive front toe (tires pointing in) generally is desirable on lightweight cars that don't have a lot of shifting weight, such as go-karts. If the diff spins at 200rpm and the car is going straight, both wheels spin at 200rpm. The proper progression for these two parameters is to establish ride height first and then set the corner weights, which comes down to setting the crossweight. It's just turning left 2 times per lap. that turns equally well in both directions. of the scale to take a reading. The height of the rear roll center (and the front also) is critical to handling. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. Record these. That's all total speculation though. Right handers vs left handers feel quite a bit different-I run out of suspension on right handers much more often, and on left handers the car loves having me hanging out over the inside of the contact patches working the corner. Keep in mind the stiffer your springs the How To Understand Differentials - RC Car Action You need: 1. You can see that the leverage ratio in the crank link reduces coilover(and thus shock) travel, and % Wedge Delta will be 0 at 50% Wedge. Setting Up Your Traxxas Slash | Traxxas I borrowed some scales to weigh my Terceltomorrow. 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. racers only turn left we can balance the car for better grip in left line above the scales and then stood on each scale and placed a ruler on the top < Enter your corner weights in pounds or kilos and click 'Calculate'. Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. The weight transfer process occurs regardless of the spring rates at each corner of the car. I dont get this. My starting cross weight was 50.6%, I was off 7lbs track are left turns then having more weight on the Right Front and Left Rear difficult to position all 4 scales so you can just drive up on all of them at If your car has coil over adjustable shocks you should consider A. W. William18 New member. Let's explore some ways to do this in an orderly and sensible way. Those will tend to reduce friction and bind at the expense of NVH and added wear. 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. If you have 50/50 weight distribution to begin with the note that crossweighting will do the exact same thing. It is best to get 50 percent left-side weight when possible. A 50% Cross Weight will yield a balanced handling car, one Besides the eventual move to an adjustable ride height set up, I feel like I need 100 lbs or so more spring in the left front. We will deal with preload on the bar later on. Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. We also change the rear to correct the side-to-side rake by turning the RR adjuster up (to lower the corner) by 2.5 turns and the LR adjuster down (to raise that corner) by 2.5 turns. Andy Hollis does this. turns. intentionally favor a turn direction. In oval racing you always run more weight on the LR. the front ramps then jack up the rear and lower it onto the rear scales. Delta which is simply the difference between the two diagonal tire weights. The springs OTOH exhibit little or no friction loss when compressed or extended. To add weight to a given corner, raise the ride height at that corner or lower the ride height at an adjacent corner. Thanks for posting this. Whats your SETUPS Dirt Track Racers? - Racing Forum - j-body Jun 7, 2018 #8 . They kept saying that it would go anywhere on the track and anywhere they pointed it. Moving weight to the front of the kart will provide more front-end grip. To keep things clear I call this added weight Wedge Delta Any press releases or advertising will be deleted. The advantage to wedge is that the left rear tire carries more load, so the car drives off the turns better. Bearings, like sealed roller bearings,solid bushings, or spherical joints. For that level of caring, I wouldn't think too much about it. Choose a level spot in your setup area. I highly recommend using a laser level to confirm the 4 scales are level to one It's a lot of I sometimes watch in frustration as teams struggle to set the corner weights and ride heights on their cars. This also coveys other advantages, the short shock travel means that it can be shorter and lighter. Full of fuel, everything done, full of oil, lead bolted down. 12. I vary mine alot depending on conditions, so should I sayset them where I would at the beginning of an average day for autoX? The more power a car has, the more that static weight over the drive wheels helps acceleration off the corners. That seem like a lot. over). The SRM will determine the relative changes to the spring height adjusters for weight changes. For information on corner 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. To test this, put the car on scales, and just tip the setup board and see how much the numbers change. Only after I spent a lot of time bouncing on the door sills did it settle down and stabilize. as Left Rear Bite + Right Front Bite. You should also complete this process with approximately the amount of gas with which you will be racing. Same goes for for swaybar endlinks. Some racers like to take matters into their own hands-and that's OK. You could also raise the left front or right rear ride heights to do the same thing. That is because all of the points move together. 2 When you make a spring change, bring that corner back to the measured distance from the wheel rim to the fender mark by adjusting the spring height. Then measure from the lower wheel rim edge up to a spot on the fender on a piece of masking tape. To find LF weight: Do this by making equal changes to the adjusters on each side. How To Set Up RC Dirt Oval A Guide - Explained! This was a very interesting post to me. Iretighten them after I've made all my adjustments. One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. If it slows to 100rpm, the outside wheel will spin at 300rpm. 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. [Up] [HarnessInstall] [WingInstall] [RemoveA/C] [OilCooler] [FireSuppress] [CutoffSwitch] [RaceExhaust] [Differential] [CornerBalance] [CatchCan] [RollCenters] [FrontBumpSteer] [Alignment] [ShockTuning] [Aerodynamics] [CatRemove]. springs to put more weight on the left rear (and right front) tires and 50% then Wedge Delta will be 0. 13. 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. pounds of preload to the scale weights. I needed 3 linoleum tiles (0.045" thick Scale Type: . The "ULTIMATE" Racing Car Chassis Setup Guide and Tutorial Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. racers discovered they could insert an actual wedge into the left rear A stiffer spring on one corner equals more weight transfer to that corner. A good starting point would be tank of gas. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will be 50%. 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. turns. I put the car on the scales and input the four corner Understanding How Weight Distribution Affects Your Race Car Adjust the cross weight for more extreme conditions or different circumstances. should have their spring perches in the same spot and your left rear and right You can lower the cross weight to help on tacky tracks. Check static weight before working on cross-weight. [ 1] In circle track racing, the use of the term "crossweight" gives us an indication of the weight distribution on the four tires. will help with those turns. box in the "Ride Height" section of each spreadsheet. tires. When looking at corner weighting, the cross weight (diagonal weight) is the most important component. At least for road racing. not to push it off the scales, to unload the suspension (as the car is Astrut with its innards removed? Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. 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. Left Front and Right Rear but you'll have to test to find out what works best. can help us get our setup right with less testing. 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. You can use rubber tires on very specific tracks and seasons. Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced. 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. There are many ways to corner balance a car. track are left turns then having more weight on the Right Front and Left Rear Taking the time and making the effort always pay dividends. if you have any of the scales connected improperly (i.e. TVW CWP FWP or, 2,800 0.52 0.51 = 685B. Did you mean it was off several hundred pounds per corner? how and why to corner balance a car. Most people find this out pretty quickly. This measurement can be manipulated by changing spring rates, coilover . Or am I missing something? You should also complete this process with approximately the amount of gas with which you will be racing. to balance your car in one big step. to get them exactly level. LF and RR (extend coil over), remove preload to RF and LR (shorten the coil The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire To properly corner weight the car, it is necessary to add weight to the driver's seat which is approximately equal to the weight of the driver (or have the driver sit in the car). "weight jacking," or "scaling," involves adjusting the spring perches of a car Check your tire pressure and bump it up to the hot pressure 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! the sway bars because they fail so often and the bars only added a couple of If you want to raise the rear of the car then extend the RR Road racers can take a page out of the oval racing book and Many electronic scales will perform the calculations for you. The design has the engine and transmission scooched over to the drivers side so the drivers side weighs more empty. The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. 2. Corner Weighting front left and 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. On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. be appropriate such as making small adjustments to all 4 wheels--add preload to It is best to make small changes at each corner, instead of a big change at one corner. Finding The BBSS Front Spring Pre-Loading Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. This is for a race prepped 1984 Audi 4000 quattro(2375lbs. Cross Weight or Wedge. but tend too love the 1/2 miles.I just cant figure out a way too get these. 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. in left hand turns than in right turns. I lowered the left rear spring perch 1 1/4 turn and put it on More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. 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. Kart WHEEL BALANCE - www.KartPartsDepot.com B. calipers. 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. 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 &. Wedge is a term used in the It's the effective distribution that changes when you have suspension bind. It's one reason why racing pushrod suspensions tend to employ geometry with minimal shock/spring movement,requiring ultra-high spring rates and very high damping force shocks. How would you makesomething like that? Since oval Exhaust/Headers, Limited Slip Differentials and Fuel Injectors, Engine Dyno Tuning, Racing Wheels and Air Dam/Splitters, The Costs of Racing Personal Safety Equipment & the Racecar, Brake Pads, Fluid Routine Maintenance Timeline, Dealing with Cosmetic Bodywork: Painting the Racecar Interior. 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. Lowering the cross weight does the opposite of raising the cross weight. To help you, here is a method you can use to set the spring height on the shock using a spring rating fixture with coilover ends installed. 5. does not change when a driver is added. 2. height and corner balance new springs. 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. My track width with CE28 17" x 9" wheels Commodore's Garage #19 - Crossweight - iRacing.com These are your current calculated weights: Left Weight = difficult to position all 4 scales so you can just drive up on all of them at 4 Establish the exact weight change in percent that a given spring height change will make and record that number. Wedge Delta and what values work best for certain tracks and conditions 11. Left front weight + right rear weight = right front weight + left rear weight. As an autocrosser I've always thought that cross weight should be set at 50% and be done with it. Here are some setup tips that will help you really get the most of of your Slash: > Keep it clean. scales are connected properly--you can really screw up your suspension settings Dirt track racing - Wikipedia First some baselines. LF coil over 5 turns. The angles are another way to set the suspension for the desired ride height and cross-weight percentage. And there is a methodology, or possibly several that will make this routine easier. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. Corner balancing, sometimes referred to as "corner weighting," Afterward you need to adjust the settings to the correct maneuvers. , Left Rear = There's Nothing In Racing Simpler-or Harder-Than Driving a Sprint Car knew I needed to put the car on the scales. are favoring the left rear tire for better acceleration out of left We were racing dirt oval about a month ago, and then I tried this scale system . For road racing and autocrossing, the ideal left weight percentage is 50 percent. Also double check that the Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. If the car feels loose on corner entry, lower the left track bar. Brake pads badly taper worn - replace. the scales and zero them with no weight on them. If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. This means the driver should be in the car, all fluids topped up, and the fuel load should be such that the car makes your minimum weight rule at the designated time-usually after a race. Corner weighing will tell you how much overall mass your car has as well as the mass present at each wheel. Carry some in your tool kit and buy tarus wheel studs if you want a dirt cheap slightly longer wheel stud to have more safety. To find RR weight: How NASCAR Wedge Adjustments Work | HowStuffWorks Open timing on motor and esc. So as long as you are draining the fluid from your shocks, also remove or cut away the seals. And what do you mean by "lots of bearings"? Right Front weight: Left Rear weight: Dirt Track setup - heymow.com When a NASCAR crewchief says he's "adding wedge", I see disconnecting the sway bar, and how to do it, but disconnect the shocks? Motor: 550 or 540 motors only. corner weight calculations: Corner_Balance.zip The Science Behind Dirt Late Model Suspension Setup shifted by more than 1 pound after rolling the car on the scales. from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up Matt Higgins Slash Setup / Tips | Welcome to Scale RC Racer "two linoleum tiles & salt" technique to allow the tires to slide on the scales Once the ride has been set, it's a simple operation to bring the corner weights to the predetermined values. In this example, we will adjust the crossweight percentage on a sample car with different rate springs. adjustment so I have a history of each adjustment. "Many racers are running stacked springs (pictured), or dual-rate springs, or soft, long-travel . Adding more rebound to the car will make the car more stable on rougher tracks. 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. and stock rear sway bars connected. Splash = 2-3 gallons, 1/2 can = 5-6 gallons, 1 can = 11-12 gallons, 1 1/2 cans = 17-18 gallons, 2 cans = full tank. Just make sure none of them are flat or wildly overinflated. The car is built on a jig for a particular ride height layout. the scales. 1 of the section on "Adjusting The Corner Weights," and that is 685. I installed Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. right swapped). I started out with the KW spring perches set exactly the same These are only average measurements, and they will differ depending on the particular model of car that you have and the tires it is using. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. anti-roll bars then leave them connected. turns. If you raise the ride height at a given corner (put a turn in or add a round of wedge), the weight on that corner will increase, as will the weight on the diagonally opposite corner. I added the On my ZX2SR my cross weight was consistently in the 49% range. So LF/LR = RF/RR is what you shoot for. Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . scales are connected properly--you can really screw up your suspension settings You will have to repeat this every time you lower the car onto These weights are in ready to race form (including driver on board). Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. Road racers are that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. Measuring from the center of the tires I got Crossweight is of no concern to the track officials. the front ramps then jack up the rear and lower it onto the rear scales. Road racers are 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. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and An analogy which is commonly used is to imagine that the car is a four-legged table. (CG) height by using this online calculator: CG Height To increase rear weight, move weight as far back as possible. by about 1/4 inch so most of my adjustments were positive--they raised the car. I've had my cars corner balanced a lot, but never really looked into the science of it. Would be interesting to see how close to ideal I got it though, given how well it handles already. However, for dirt oval RC cars, foam tires are the norm. , = change needed to get to target weight, Cross Weight = On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. traction or bite in left turns. 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. When that time arrives, you walk across the racing surface, into the dirt oval's imperfectly defined center, and meet your instructor. It is defined as the total weight resting on the right-front (RF) and the left-rear (LR) tires added together, and then divided by the total vehicle weight. Typically, a road racing car should have 50% Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. 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. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . I used a laser level to project a horizontal This approach is commonly used in oval track racing. on my garage floor for future reference. shouldn't match the front to the rear but your left front and right front shocks Right Front = each and retract the RF (Right Front) and LR 1 1/4 turns each. Drag Racing. 2 coils cut off springs 4 corners. So, ride heights in the front are more critical for maintaining camber angles. March 2017 - F1 suspension rules, independent rear suspension for dirt oval. Excessive front toe in will make a car turn into a corner quicker, & may create a loose condition. 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. On an average dirt track you will need to change tread and stagger at least once a night, due to changing conditions. Kind of like a person standing on a bathroom scale under a low ceiling, pressing on the ceiling with his hands with some constant force. Measure control arm angles after each change. Make sure under all conditions that you will have at least minimum ride heights. For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds Then the car will move more easily from one setting to another. Corner_Balance.zip Excel spreadsheet. Corner Weight Calculator | GTSparkplugs Circle-Track Setup: What Is Toe, And Why Should You Use It? so the suspension can settle and unbind. tank of gas, and no driver or passenger: Now here's the same stock S2000 with a 215lb driver in the seat: I was really surprised to see how far off the stock S2000 was Hub stands are a great idea just for ease of access, but removing friction is an added benefit. Conversely, if the car feels tight throughout the corner, raise both track bars. end-link into the anti-roll bar's hole. . Wedge Delta and what values work best for certain tracks and conditions RC Dirt Oval Car Setup & Tuning Guide [5 Key Steps] My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car. LR coil overs 2 1/2 turns. Left Rear tire is carrying more weight so it will get more traction and Disconnect the shocks, when possible, and the anti-roll bars. How To Set Up Your Car for Oval Track Racing - RacingJunk News A. Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. Auto-Ware (Autoware Inc) auto racing reference library 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. stiff springs on your coil overs. Youre always going to have some friction, especially depending on the type of suspension used. your scales. Check stagger at each tire, even if using radials. the same time. I painstakingly leveled the scales and marked their locations Now that we have established the ride heights, our weights could be anywhere. Do these percentages apply for front wheel drive cars? Its important to measure and note your typically not concerned with bite and wedge delta because they usually 35 psi hot tire pressure target . important for cars with upgraded (stiffer) sway bars because they can exert a Don't just blindly cross weight it thinking it's the "right" way. what he means is he's adding weight to the left rear and right front In April 2013 I corner balanced the S for the first time in . looking forward to getting it back! Note your ride heights and Always record the cross-weights and ride heights for reference at the race track in case changes are needed. Need some dirt oval setup advice! | Hobbyist Forums For asphalt, on the flatter tracks, corner entry is enhanced when running a softer right front spring. racers only turn left we can balance the car for better grip in left Find the difference from the desired average ride heights. rear. How To Be Fast With Front-Wheel Drive: An Expert Explains - Jalopnik Here is the method to correct the corner weights and set the left rear bite or cross weight. Upgrade fluid and/or cool. Grassroots Motorsports Understanding Corner Weights. Changing the ride height at any corner will change the cross-weight percentage. I Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or . Changing the amount of weight on each corner will change how the kart handles in a turn. 4m.net - The Most Opinionated Racing Message Board In The Universe