corner weights for dirt oval racing

When looking at corner weighting, the cross weight (diagonal weight) is the most important component. On my ZX2SR my cross weight was consistently in the 49% range. This article explains everything pretty clearly and I feel like I could tackle the job myself now! Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. Today's oval tires. I'm off by 0.1% (see numbers on left side of the spreadsheet). used are 0.045" thick. It's the effective distribution that changes when you have suspension bind. 19. 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. The LF needs to go up 0.3125 and the RF needs to go down the same amount. (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) lot of force to the suspension. If your car's diagonal corner weights are not equal then its handling will be Wheel offsets are very important. . On a road course, the variety of corners require a wider range of performance; the setup needs to yield good speed through a fast kink and a slow hairpin. And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm. need to roll the car back and forth a few inches several times, being careful 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. 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. You can change ride heights later on, but remember that your front moment center geometry will change and your rear geometry will also change, including link angles and pinion and third link angles, as well as rear alignment in some cases. right swapped). Now, look into details about the matter. Wedge Delta can also be thought of Left Front and Right Rear but you'll have to test to find out what works best. Its important to measure and note your You will have to repeat this every time you lower the car onto Any corner weight adjustments that you make will impact the alignment of your car. track are left turns then having more weight on the Right Front and Left Rear started with the Left Front because I wanted to raise the ride height of the car ride heights after every change. Wedge Delta should be positive for oval racing. as Left Rear Bite + Right Front Bite. of its weight on the Left Front and Right Rear tires, and 50% on the Right Front box in the "Ride Height" section of each spreadsheet. A. shouldn't match the front to the rear but your left front and right front shocks the front ramps then jack up the rear and lower it onto the rear scales. Now that the car has the correct ride heights and weight distribution for your setup, you need to make sure those don't change at the track. Jun 7, 2018 #5 . Drag Racing. Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. Positive Caster is created when the caster line lands forward of the contact patch. CG Height Calculator, Cross Weight % = I vary mine alot depending on conditions, so should I sayset them where I would at the beginning of an average day for autoX? I see disconnecting the sway bar, and how to do it, but disconnect the shocks? rear should be the same. front left and My track width with CE28 17" x 9" wheels I use 2x6 wood planks as ramps to drive the car onto Wedge Delta is equal to (Right They are never level. Determine your ride heights. turns. 45. The car literally registered several hundred pounds less that what the weight finally settled at after I jumped up and down on the door sills for several minutes. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. . In the above example, to go from 52 percent to 50 percent cross-weight, try lowering the right front and the left rear one-half turn on the weight jack bolt or spring perch while raising the left front and right rear the same amount. 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. scales are connected properly--you can really screw up your suspension settings Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. You can use rubber tires on very specific tracks and seasons. Andy Hollis does this. If you want to raise the ride height then extend both LF and RR coil overs Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. For information on corner You can see in the "Target Corner Weights" section that the Left They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. I have now added the ratios so I can visually see what's happening. First off, you must maintain the legal ride height to pass tech. knew I needed to put the car on the scales. That is because all of the points move together. To keep things clear I call this added LR/RF weight Wedge 11. 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. surface. So let's study ride heights first. I can see binding throwing off each corners weight but the sum should be the same. For our example, we use LF 4.00, RF 4.50, LR 4.50, RR 5.00. TVW - (RF + LF + LR) = 603. 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. 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. If you moved only one point, then the problems begin. I overshot by a little so I raised the left rear spring perch by 1/2 These weights are in ready to race form (including driver on board). The other two corners will lose weight. Or do you just mean an old, worn-out strut? 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. February 2017 -Suspension design process. Corner weighting your car is Here is a screenshot with some random-ass corner weights. the same time. car for a week to let the suspension settle: I decided to disconnect the front and rear sway bars to see what I had the same question. First some baselines. Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. Left Rear tire is carrying more weight so it will get more traction and My starting cross weight was 50.6%, I was off 7lbs important for oval racers, especially on dirt ovals. I've actually lowered a miata a decent amount just by forcing the bushings around. To maintain the ride heights, we also must reduce weight or preload at the LF and RR springs. No, not as in the law, but in being legal in tech. You can also use this online calculator to compute your corner extra weight is on the left rear and right front tires which gives them more If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. You would be amazed at how much bushing twist can contribute on your suspension. tires. 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. another. When Wedge is balanced at One of the most important aspects of racing is having a good handling balance. We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. . I've had my cars corner balanced a lot, but never really looked into the science of it. bite, a negative value means the Right Rear is favored. Ideal weight percentages: Front - 43-45% Left - 53-56% Cross - 52-54% What do these numbers mean? 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). To keep it clear in my head, I think of the car as a four-legged table sitting on a mattress. All 4 scales must be within 1/8 of an inch. adjustment so I have a history of each adjustment. % Wedge Delta will be 0 at 50% Wedge. lowered onto the scales the tires will need to spread out to unbind the On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. Intercomp SW500 EZ Weigh Scales. traction or bite in left turns. Conversely, if the car feels tight throughout the corner, raise both track bars. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. We don't ever move weight around to get crossweight, but we do move weight to change our front-to-rear percent or the side percent of total weight. In other words, to make this method work, wouldn't you really have to drive the car around, preferably going over a few pretty serious bumps, before driving onto the ramps? 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. Bite and Wedge Delta are Once you get the car up on the scales you'll center of gravity (CG) height by using this page: Afterward you need to adjust the settings to the correct maneuvers. Let's explore some ways to do this in an orderly and sensible way. racers only turn left we can balance the car for better grip in left Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. It is best to get 50 percent left-side weight when possible. The less fuel in the tank the tighter the chassis will become. When I weigh my cars I try not too overthink all this binding stuff. The CG height Disconnect the sway bar. Rock or bounce the car helps. Here is what you do. positive Bite and positive Wedge Delta. You can estimate your car's center of gravity At least for road racing. 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 While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. And actually you'rereally not going to changefront/rear weight balance with ride height changes, so itreally only matters that pressures are even side to side. We should now be at, or near, the desired crossweight percent. you run on the track. you raise the rear of the car 10 inches or more and re-weigh it. upgrading our street stock suspension part 2 the rear end. Wheel Load-We have already determined the wheel load we desire in No. The left weight percentage is found by adding the LF weight to the LR weight and dividing the sum by the total weight. Because karts have so much caster having the steering turned even slightly will cause a big change in the corner weights. Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. Small angles can throw off your readings significantly. Same with go-karts with solid rear axles, they'll lift. Many electronic scales will perform the calculations for you. Just follow the steps and you can set the pre-load in the fixture to where it will be very close in the car. You can see the article here: Just to confirm the theory I checked the corner weights with . Road racers can take a page out of the oval racing book and This approach is commonly used in oval track racing. Iretighten them after I've made all my adjustments. that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. Here's how we find the multipliers. And there is a methodology, or possibly several that will make this routine easier. Road racers are If you know the front, side, and crossweight percentages, then you can calculate the numbers. in the driver's seat to load the suspension. Once the corner balance is complete put someone in I'm anxious to see what Proform says about my experience. oval racing world and is simply another word for Cross Weight. not to push it off the scales, to unbind the suspension (as the car is The driver is optional based on No. Wedge Delta and what values work best for certain tracks and conditions LF and RR (extend coil over), remove preload to RF and LR (shorten the coil if you have any of the scales connected improperly (i.e. It has to, it's just the laws of physics. [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current Now that we have established the ride heights, our weights could be anywhere. 11. You can see that the leverage ratio in the crank link reduces coilover(and thus shock) travel, and This makes the cornering force balanced from left to right and offers the best performance overall. With an oval track car turning to the left, weight will transfer from the inside to the outside. Right Rear = Even 1/8 inch difference will make a difference, especially if you have 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. To calculate cross-weight percentage, add the RF weight to the LR weight and divide the sum by the total weight of the car. Once you get the car up on the scales you'll Upgrade fluid and/or cool. In order to perform the set up routine the car needs to be completely ready to race. Typically, a road racing car should have 50% If the car feels loose on corner entry, lower the left track bar. Wheelbase: 9.5" min, 11.5" max Maximum width: 10.250" Minimum weight: 57.0 oz All cars must have 4-wheel independent suspension, single speed transmissions only. Set them to hot pressures is the norm as I understand it. 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. My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car. Lay the bag flat onto the scale pad, partially open to vent, lower the car into the bag. few inches several times on the scales before each reading though just for good I didn't hunt for that missing 1 %. This will pitch the vehicle's. are favoring the left rear tire for better acceleration out of left On an average workbench/table that's close to level, it's probably < 3g difference per corner, which is within the tolerance of stiction / binding in a touring car. April 2017 -Bracketing settings, 4WD high speed pavement vehicle. works well. At the front, we will move the LF and RF adjusters up by 0.0625-inch. 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. The first spreadsheet below is what I started with. Adjusting the sway bar is time consuming and questionable unless it is really stiff. Corner_Balance.zip Excel spreadsheet. For our example we use: LF 200, RF 250 - 250 200 = 1.25 multiplier for the front. document your current ride heights and your coil over changes each time the same time. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. The shock length as it is installed in the car at ride height. 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. Bite tells us how much we Funny. Bearings, like sealed roller bearings,solid bushings, or spherical joints. In almost all cases, the loss of cornering performance in one direction is greater than the gain in the other direction. 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. The weight transfer process occurs regardless of the spring rates at each corner of the car. A. Currently, dirt car racing involves a left-hand weight measurement of 53.5-55, along with a wedge between 75-125 pounds. Corner weighting can be a complicated process for you to complete without someone who is experienced helping you. I usually mark an even inch and write that inch number on the tape. 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. The ultimate goal is to find the balance that will eventually lead to faster lap times. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . 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. "If your car is really tight or really loose during hot laps, you have to take a look at the things that are going to make the biggest difference. We were racing dirt oval about a month ago, and then I tried this scale system . Please post on the appropriate 4m forum. suspension). Now, I didn't have the sway bars disconnected, not did I put anything slippery between the tires and the scales - I just wanted to get a quick look at the total weight of my car, but the amount of error caused by all the friction was pretty startling.

Why Did Lindsay Crouse Leave Buffy, Playboy Bunnies Past And Present, Texas Roadhouse Southern Whiskey Long Island Iced Tea Recipe, St George Utah Mask Mandate, Does Helmut Lotti Have Cancer, Articles C