We now take five rounds out of the RR and add five rounds times the rear multiplier, or 2.0 5 = 10 rounds to the LR. You can also estimate your car's Oval If you get the car neutral in left turns, it oversteers in right turns. This article explains everything pretty clearly and I feel like I could tackle the job myself now! These are your current calculated weights: Total Weight = Front Weight = % Left Weight = % Right Weight = % Rear Weight = % Cross Weight = 50% is optimal Bite = Bite should be positive for oval racing Wedge = % Wedge Delta should be positive for oval racing intentionally favor a turn direction. I mainly run the 3/8. Finding The BBSS Front Spring Pre-Loading height and corner balance new springs. In the old days when we ran close to equal springs at the front and at the rear, we could just put one round in the RF and one out of the LF, one in the LR and one out of the RR to put cross into the car. . Use a load of fuel for where you you want the car balanced, either at the start of the race, the end of the race or an average between the two. Many electronic scales will perform the calculations for you. 3) Reverse stagger: The opposite of stagger when your left side tires are . Drag Racing. oval racing world and is simply another word for Cross Weight. Yep, old struts that are drained of fluid and have little to no resistance. For our example we use: LF 200, RF 250 - 250 200 = 1.25 multiplier for the front. R. racing junky Member. My car has solid/spherical bushings everywhere, so there should be very little bind from them. Check your tire pressure and bump it up to the hot pressure We do this by jacking weight into, or adding preload to, the RF spring and the LR spring. LR = left rear. Oval racers favor left turns so they typically desire more weight The Circle Track Analyzer is a computer program that simulates most any car you can design, racing on most any size oval track. Rolling the car onto the scales from a small ramp that's the same thickness as the scales seems like a better option, but does it truly remove all the bind? Circle-Track Setup: What Is Toe, And Why Should You Use It? important for oval racers, especially on dirt ovals. 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. 5. 8 Read the ride heights as they exist. Even 1/8 inch difference will make a difference, especially if you have Moving weight to the front of the kart will provide more front-end grip. your scales. Road racers can take a page out of the oval racing book and 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. TVW CWP FWP or, 2,800 0.52 0.51 = 685B. To get good accuracy easily make sure you get the low hanging fruit first like removing the friction between the tires and the scales so there is no bind. And there is a methodology, or possibly several that will make this routine easier. It's 11. So if you have 60% on the front , you should have 30% on each front wheel. I didn't hunt for that missing 1 %. RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval - YouTube Adjust the rear down by using the same method as in No. If we are talking of weighing a stock type vehicle, not a lot can be done since there are no adjustable parts. 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. extra weight is on the left rear and right front tires which gives them Thinking about this a little, the weight measured by the scales is the sum of the force of gravity acting on the car's mass, and the force of the springs pressing downward. 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. the scales. lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille W. William18 New member. Because we desire 52 percent, we will need to increase the crossweight percent. Dirt Track setup - heymow.com 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. It's better to make many small changes than to try Corner weighting is huge. Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. One of the most important aspects of racing is having a good handling balance. The CG height Maybe I'm over-thinking this, but I was amazed when I got my new scales, and let my car down on them for the first time. Today's oval Proforms are cheap scales. per wheel. It is best to make small changes at each corner, instead of a big change at one corner. racers only turn left we can balance the car for better grip in left Right Rear = 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. Dodge Neon Build and Race Advice Gen 1 - Technical Discussions However, if you have to apply opposite lock steering (turning the steering wheel to the right) and you drive the car throughout the corner balancing it with the throttle . on each wheel to speed shock adjustment. 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. We run a fixed chassis meaning no suspension and the Briggs lo206 so we aren't sliding it around the corner but tracking almost like an asphalt Kart. Same with go-karts with solid rear axles, they'll lift. Always record the cross-weights and ride heights for reference at the race track in case changes are needed. 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? ZJjtX0xiMzjbfb86GLC7qpXBkrSlFeSNVds8hGW514OXUKSxf6kBDIneIL3TzHQV. 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. Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. Setup Routine - JOES Racing Products CG Height Calculator, Cross Weight % = Are they adjustable? The only way to change the static weight distribution percentages is to physically move weight around in the car. typically not concerned with bite and wedge delta because they usually Remember that this is a sample car, so don't use these numbers, but do use this method. However, most importantly you need to take care of the handling. Keep in mind the stiffer your springs the RC Dirt Oval Car Setup & Tuning Guide [5 Key Steps] This obviously means that decreasing cross weight or left side weight For now, we don't want the bar to influence the ride height or the weights we set later on. Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? 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). However, you can choose to use them. 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. Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. A. 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. close to where I wanted it. Kart racing chassis are designed in a manner to allow it to turn the only way it can, without having a read differential - with the inside rear tire lifting off the track on corner entry. I saved a copy of the spreadsheet for each Wedge Delta can also be thought of Bite tells us how much we Andy Hollis does this. decided to try 5 turns total of spring perch movement to balance the car. turn to the RF simply to raise the ride height of the front of the car. calipers. scales are connected properly--you can really screw up your suspension settings Lay the bag flat onto the scale pad, partially open to vent, lower the car into the bag. but tend too love the 1/2 miles.I just cant figure out a way too get these. Equal weight on each front wheel, same on the rear. One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. Open timing on motor and esc. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. Since oval Grassroots Motorsports Understanding Corner Weights You should read the spring preload amount. you don't use Microsoft Excel. Road racers are Less fuel equals faster speeds. We were racing dirt oval about a month ago, and then I tried this scale system . You would be amazed at how much bushing twist can contribute on your suspension. more traction or bite in left turns. Crossweight is of no concern to the track officials. scales. Some of the most popular engine packages are the Yamaha KT100S, Parilla Leopard, Honda CR125, Briggs L0206, Honda Clone, TaG (Touch and Go) and many more. They are never level. Calculate the average front and rear desired ride heights. Examine a modern push/pull rod suspension, particularly if it uses a crank link to transformthe It's a lot of This was my first adjustment: Four turns of positive coil Now that we understand why we need to maintain a set ride height, let's go through an example of how to set ride height. For that level of caring, I wouldn't think too much about it. unbalanced--it will turn better in one direction than in the other (all other 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. Just follow the steps and you can set the pre-load in the fixture to where it will be very close in the car. For street cars it certainly can be. I needed 3 linoleum tiles (0.045" thick 13. Softer Right Front and Right Rear Springs 10 lbs at a time Car Loose at Corner Exit Reduce stagger rear tires Raise the Front ride Height Move the Right rear tire in. I've read all the info before, in various places, but it's good to have a refresher. I put the car on the scales and input the four corner Before putting your car on the scales you need to power up The coiloversare typically mounted parallel to the centerline above the driver footwell. Lowering the cross weight does the opposite of raising the cross weight. Choose a level spot in your setup area. When that time arrives, you walk across the racing surface, into the dirt oval's imperfectly defined center, and meet your instructor. Doing the multiplication to square that number, we get 1.1056. Same goes for for swaybar endlinks. 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. To increase rear weight, move weight as far back as possible. Dirt Track Chassis Set-up At The Rear For Cornering - Auto-Ware Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. Calculator, I used these scales to weigh the car: adjustment so I have a history of each adjustment. RC Oval Racing - Indy RC World hard work but it makes all that high dollar suspension work together the way its 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. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. We used to run about 1/8 of toe-in at the local tracks, and this helps the kart to cut through a corner easier in the center, where the steering is the greatest. Always Please post on the appropriate 4m forum. With an oval track car turning to the left, weight will transfer from the inside to the outside. What is Wedge in Dirt Racing? How Can it be Fixed? - Southern Reaceway Fans Set them to hot pressures is the norm as I understand it. about 1/8" of wheel movement) to reduce the weight on the right front and left It's the effective distribution that changes when you have suspension bind. 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. Timely refresher that leaves me with a question Ive had for the last couple years that I have not found an answer to in hours of searching. More wedge means that the car will likely understeer more in a left turn. I just back all of the damping off totally. it would help the car turn left and accelerate better. Dirt oval racing tips/ Go karts - Don Terrill's Speed-Talk 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. stiff springs on your coil overs. retract the right rear tire which puts more weight on the Left Rear and can help us get our setup right with less testing. and Left Rear. pounds of preload to the scale weights. Excessive front toe in will make a car turn into a corner quicker, & may create a loose condition. 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. Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced. Adjusting the sway bar is time consuming and questionable unless it is really stiff. Even 1/8 inch difference will make a difference, especially if you have How to Adjust iRacing Sprint Car Cross Weight AKA Wedge This will not change the left-side or rear weight percentages. This allows a slightly lower rear stance, which provides a good weight transfer entering a corner. You cannot change the left or rear percentages by jacking weight around in the car, although this will change cross-weight. Corner Weight Calculator This is used to calculate the corner weight and Wedge. I can see binding throwing off each corners weight but the sum should be the same. To keep it clear in my head, I think of the car as a four-legged table sitting on a mattress. In almost all cases, the loss of cornering performance in one direction is greater than the gain in the other direction. The car is built on a jig for a particular ride height layout. Right now I have (IIRC) 350 lb front and 200 lb rear springs (koni sport, eibach pro line, ST anti sway bars) . LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. Roll Center Explained - FMI Knowledge Base - FMI Racing "This is called chassis pre-load. Disconnect the shocks, when possible, and the anti-roll bars. Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. Typically, a road racing car should have 50% Right Rear. It's Full of fuel, everything done, full of oil, lead bolted down. 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. Caster creates stability as the geometry . If you do have adjustable end links then disconnect Weight can be moved around at the track to fine tune the handling characteristics of the chassis. 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. 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. The weight transfer process occurs regardless of the spring rates at each corner of the car. This was a very interesting post to me. 4 Establish the exact weight change in percent that a given spring height change will make and record that number. looking forward to getting it back! suspension). You can also use this technique when adjusting your alignment and Changing the ride height at any corner will change the cross-weight percentage. You need to follow distinct directions to set up your RC for a dirt oval. few inches several times on the scales before each reading though just for good April 2017 -Bracketing settings, 4WD high speed pavement vehicle. Dirt Late Models. Are they non-adjustable? We delve deeper into race suspension tuning basics here. Less tread on hard slick is good. Wedge Delta and what values work best for certain tracks and conditions To find RR weight: Do not adjust any other wheel's spacing. Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. Corner Balance - Rob Robinette Using dead strut inserts could be an option for cars with strut suspension. Cross weight and left side work backwards in terms of adjustment. It varies with weight removal, added. right swapped). scales are connected properly--you can really screw up your suspension settings It puts power down better, and any decent FWD car will be carrying a wheel in the air around a turn anyway, so by default the outside rear gets 100% weight transfer when it's being asked to turn anyway. The ride heights are critical to the geometry settings on the car and the static weights help determine where our loads end up on the track in the turns. Step 1 - Determine Sprung Weight. If you shocks are working normally they are not worth worrying about. %Right Weight = You can see the article here: if you have any of the scales connected improperly (i.e. Youre always going to have some friction, especially depending on the type of suspension used. Would be interesting to see how close to ideal I got it though, given how well it handles already. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. Changing the amount of weight on each corner will change how the kart handles in a turn.

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