corner weights for dirt oval racing

For our example, we need to go from 49.8 to 54 percent. the scales and zero them with no weight on them. Excessive front toe in will make a car turn into a corner quicker, & may create a loose condition. I To find LR weight: In order to perform the set up routine the car needs to be completely ready to race. The cosine of 18 degrees is 0.95106, and that into 1.0 is 1.05146. The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. That is why a stiffer right rear spring makes the car looser. Corner weight system - R/C Tech Forums adjustment so I have a history of each adjustment. to get them exactly level. Are they adjustable? The process is so basic to the setup of the car. This will not change the left-side or rear weight percentages. 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. Bite should be positive for oval racing, Wedge = Note the "Conditions and Changes Made" Wedge Delta can also be thought of Hot Rod. "Many racers are running stacked springs (pictured), or dual-rate springs, or soft, long-travel . 4. Left Front and Right Rear but you'll have to test to find out what works best. . For road racing and autocrossing, the ideal left weight percentage is 50 percent. All rights reserved. spread when the car is lowered onto the scales. Once you get the car up on the scales you'll LR = left rear. It still pays to be thoughtful about weight placement fore and aft in your car. This was a very interesting post to me. Still, it is a worthwhile goal to strive for 50 percent left-side weight. Cross Weight % = It's the effective distribution that changes when you have suspension bind. car for a week to let the suspension settle: I decided to disconnect the front and rear sway bars to see what A place where you can add in your Photo Galleries. %Right Weight = 4 Establish the exact weight change in percent that a given spring height change will make and record that number. Softer tire compound Right Rear Increase Right front and left rear Corner Weights Bicycling Left side tires lose contact with the racing surface More overall left side weight % 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. The left side changes, of course, will be 4.75 times the multiplier for front or rear. Keeping track of Bite and To find RF weight: 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. Right Rear. Setting Ride Height & Corner Weight - Circle Track Magazine - MotorTrend right swapped). 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. 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. Record these. camber angle of the wheels (-3.5 front, -3 rear). Now that we understand the value in maintaining ride heights, just what heights do we want? Dirt or asphalt? Maybe there's some sort of bind in the scales. When working with static weight distribution, we use two percentages to analyze the car's corner weights: Left weight percentage and rear weight percentage. This approach is commonly used in oval track racing. anti-roll bars then leave them connected. The front will show close to 60%. Rethink Dirt: Advanced Dirt Track Theory | Hyper Racing That makes every little detail that much more important. 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? 11. oval racing world and is simply another word for Cross Weight. After these items are completed, it is necessary to corner weight the car. Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. Dirt track racing - Wikipedia turns. 50% then Wedge Delta will be 0. Andy Hollis does this. My track width with CE28 17" x 9" wheels 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. 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. W. William18 New member. 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 a road course, the cross-weight percentage should be very close to 50 percent, within a half-degree either way, to keep the handling balance similar in a right-hand turn compared to a left-hand turn. I painstakingly leveled the scales and marked their locations are favoring the left rear tire for better acceleration out of left upgrading our street stock suspension part 2 the rear end. A 50% Cross Weight will yield a balanced handling car, one Cross Weight or Wedge. I mainly run the 3/8. LF and RR (extend coil over), remove preload to RF and LR (shorten the coil Suggested Adjustment Procedure for Oval Track - KONI NA Do youhave recommendations for such corner weight percentages? weights into the spreadsheet (the blue numbers in the left "Corner Weights" Do not adjust any other wheel's spacing. How To Corner Weight Your Car - Suspension Secrets 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. All 4 scales must be within 1/8 of an inch. anti-roll bar with the end-link adjusted so it's easy to insert the Get the numbers right and the percentages will follow. If most of the important turns on your Why? Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. Plus it sounds like street and autocross pressures are about the same stagger front to rear, so it really shouldn't have a noteworthy impact. supposed to. Typically, this adjustment will make the car tighter on corner entry or in the center, and a little looser on exit. When you lower the panhard bar the rear roll center drops. to get the desired corner weights your ride height will change. Since this article still gets a bunch of traffic, just bumping it up. adjustments were 1 turn to the right front and 3/4 turn to the left rear. 50% then Wedge Delta will be 0. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. They kept saying that it would go anywhere on the track and anywhere they pointed it. Equal weight on each front wheel, same on the rear. hard work but it makes all that high dollar suspension work together the way its In April 2013 I corner balanced the S for the first time in Setup Routine - JOES Racing Products This adds pressure to that end of the car just like putting the paper wedge underneath the table leg. 14. Bite = Left Rear - Right Rear and a positive value means the Corner Weighting Cross-weight is also called wedge: If the percentage is over 50 percent, the car has wedge; if below 50 percent, the car has reverse wedge. height and corner balance new springs. 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. "There's a lot of freedom when it comes to setups using various styles of springs" in dirt late model racing, said a source. Make small changes at the track, and make only one change at a time. To find RR weight: You could also raise the left front or right rear ride heights to do the same thing. Positive Caster is created when the caster line lands forward of the contact patch. decided to try 5 turns total of spring perch movement to balance the car. The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. Tuning with anti-dive probably won't be . difficult to position all 4 scales so you can just drive up on all of them at suspension changes to track your progress. They are not too suitable for racing and oval dirt cars. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. Roll Center Explained - FMI Knowledge Base - FMI Racing I found that the tire will absorb side loads quite well and was repeatable. When looking at corner weighting, the cross weight (diagonal weight) is the most important component. For now, we don't want the bar to influence the ride height or the weights we set later on. Afterward you need to adjust the settings to the correct maneuvers. 3. Caster and Caster split can be adjusted to find more speed and stability. 2 coils cut off springs 4 corners. To do this, we add five rounds of pre-load to the RF. Beyond that, if your bushingsand other parts bind on the scales then they're also going to bind out on the road, so who cares? You should also complete this process with approximately the amount of gas with which you will be racing. I needed 3 tiles on the left front and 1 on the left rear (adsbygoogle = window.adsbygoogle || []).push({}); If you prefer Microsoft Excel a Corner Weight spreadsheet is available for download here Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. the driver seat and reconnect them so there's no preload on them. Wedge is a term used in the springs settled over the first 3 months. To increase rear weight, move weight as far back as possible. of the scale to take a reading. Moving weight to the front of the kart will provide more front-end grip. (TVW LSP) - LF = 769D. Here's how we find the multipliers. My car is a 1987 Honda CRX, set up according toITC class rules. Strive for repeatable and take the measurement as a data point, instead of an absolute. Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. Need some dirt oval setup advice! | Hobbyist Forums Bite and Wedge Delta are 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. 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. Kart Scaling & Weight Distribution - Woodbridge Kart Club Dirt Race Car Handling Problems; Diagnosing and Fixing - Hogan Technologies Jun 7, 2018 #5 . 9. Wedge how and why to corner balance a car. Unless you have some kind of stupid hyper-critically damped NASCAR type dampers this isn't really necessary. typically not concerned with bite and wedge delta because they usually The "ULTIMATE" Racing Car Chassis Setup Guide and Tutorial Most chassis manufacturers will tell you what ride heights are best for their cars. Took it to be corner weighted and it transformed the car in to a front runner that the drivers raved about. If one leg is longer or shorter than the others, the table will rock and thus be unstable. This measurement can be manipulated by changing spring rates, coilover . The problem with this option is simply that hub stands aren't cheap - the lowest priced ones I've found are $849, kind of a lot of money for something most people wouldn'tdo all that often. Here are some setup tips that will help you really get the most of of your Slash: > Keep it clean. Adjust the cross weight for more extreme conditions or different circumstances. If you want to raise the rear of the car then extend the RR MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. line above each scale and placed a ruler on the top That's all total speculation though. the scales. Unsure about autox. Yeah generally its the same stagger 9/10 times. I have now added the ratios so I can visually see what's happening. Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. How NASCAR Wedge Adjustments Work | HowStuffWorks The tiles I another. 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. So 2.5" springs and experimenting is the way to go- I think I know that much.. . I added the Funny. work but in the end it's worth it. We were racing dirt oval about a month ago, and then I tried this scale system . you don't use Microsoft Excel. Now, look into details about the matter. 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). about 1/8" of wheel movement) to reduce the weight on the right front and left Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . lowered onto the scales the tires will need to spread out to unbind the 4m.net - The Most Opinionated Racing Message Board In The Universe suspension). One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. % 50% is optimal, Wedge = I highly recommend using a laser level to confirm the 4 scales are level to one racers only turn left we can balance the car for better grip in left Bite = Left Rear - Right Rear and a positive value means the Ah, OK, thanks for the clarification. Wedge Delta is equal to (Right Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. You can see that the leverage ratio in the crank link reduces coilover(and thus shock) travel, and Understanding corner weights | Articles | Grassroots Motorsports oval racing world and is simply another word for Cross Weight. First off, you must maintain the legal ride height to pass tech. Handling Guide - RACING ON THE CHEAP Set them to hot pressures is the norm as I understand it. Grassroots Motorsports Understanding Corner Weights. tiles) on the left front and 1 on the left rear to level the scales. Astrut with its innards removed? 1. Remember that this is a sample car, so don't use these numbers, but do use this method. This spreadsheet will also give you an estimated center of gravity height if need to roll the car back and forth a few inches several times, being careful Do this by making equal changes to the adjusters on each side. Ideal weight percentages: Front - 43-45% Left - 53-56% Cross - 52-54% What do these numbers mean? The angles are another way to set the suspension for the desired ride height and cross-weight percentage. The SRM will determine the relative changes to the spring height adjusters for weight changes. It varies with weight removal, added. Muscle Car. Yeah, I'm a little puzzled by my result when I let me car down on my new scales as well. 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 weight percent = 0.54, FWP = front weight percent = 0.51, CWP = Crossweight percent = 0.52. Always record the cross-weights and ride heights for reference at the race track in case changes are needed. RC Oval racing is probably the easiest form of RC racing right, right? over 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. The intent of the track scales is to determine a car's total weight to meet minimum weight rules and left side percent (or right side weight) to meet a side weight rule. 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. LR coil overs 2 1/2 turns. One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. . on my garage floor for future reference. Scale Type: . Oval are favoring the left rear tire for better acceleration out of left Shock Position Taking the time and making the effort always pay dividends. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. in the driver's seat to load the suspension. I dont get this. That is equal to 7/8 turn of the adjuster. Multiply the wheel load of 685 times the motion ratio squared, 1.3611 times the shock angle cosine squared of 1.1056 and we get 1,030.8 pounds of spring preload. Caster Creativity - JOES Racing Products I've read all the info before, in various places, but it's good to have a refresher. I weigh 220. So let's study ride heights first. knew I needed to put the car on the scales. This keeps the ride heights as close to ideal as possible. Since oval the RF coil over 5 turns. - can make your car dive like a dump truck or a block of wood on ice. For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds does not change when a driver is added. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. Today's oval My shocks are double adjustable, as many will be when at this level of prep. is especially true if you don't have adjustable spring perches. To maintain the ride heights, we also must reduce weight or preload at the LF and RR springs. If the car understeers or oversteers in only one direction, check the cross-weight percentage. But stagger is not a good idea on a road course or autocross either, where the ideal is 50-percent cross-weight and no stagger. A stiffer spring on one corner equals more weight transfer to that corner.

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