Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. Are they adjustable? 2023 Motorsport Marketing. I've had my cars corner balanced a lot, but never really looked into the science of it. The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire positive Bite and positive Wedge Delta. %Right Weight = 7. 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? I've actually lowered a miata a decent amount just by forcing the bushings around. It will let you predict and understand the effects that various modifications have on handling, performance and lap times. Most people find this out pretty quickly. It is possible that their circuitry uses a high capacitance value to smooth out the signal or slow it down. 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. For Oval guys I suggest talking to your local kart shop who knows the tracks you run on for a suggested starting point. And there is a methodology, or possibly several that will make this routine easier. much Wedge Delta and make the handling worse. can help us get our setup right with less testing. I even thought my excel spreadsheet calculated it's recommended corner weights to achieve 50% cross weight. Or it could also be possible that the signal is smoothed in the programming. Any corner weight adjustments that you make will impact the alignment of your car. So 2.5" springs and experimenting is the way to go- I think I know that much.. . It still pays to be thoughtful about weight placement fore and aft in your car. I guess I should work on losing weight personally (i am 220~). Adjust the rear down by using the same method as in No. When a NASCAR crewchief says he's "adding wedge", knew I needed to put the car on the scales. track are left turns then having more weight on the Right Front and Left Rear Before putting your car on the scales you need to power up Youre always going to have some friction, especially depending on the type of suspension used. Or maybe I read the post wrong. stiff springs on your coil overs. Road racers can take a page out of the oval racing book and few inches several times on the scales before each reading though just for good 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. to balance your car in one big step. Do this by making equal changes to the adjusters on each side. Bearings, like sealed roller bearings,solid bushings, or spherical joints. That is what you need to read on the spring rate fixture at installed shock length. 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. unbalanced--it will turn better in one direction than in the other (all other 2018 Arrow Chassis Street Stock. - zwrw.barettobeltrade.it Steve Smith Autosports - Tech Tips 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). On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. The rear weight percentage is found in a similar manner: Add the LR and the RR weight together and divide the sum by the total weight. Choose a level spot in your setup area. extra weight is on the left rear and right front tires which gives them more 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. 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. balance is complete put someone in the driver seat and reconnect the This gets very tedious, given the number of iterations it typically takes to get the corner weights right. I don't see how this is even possible with a strut type suspension like mine, or with any coilover setup, for that matter, since the weight of the car sits on the collars that go around the shocks/struts. typically not concerned with bite and wedge delta because they usually what he means is he's adding weight to the left rear and right front It varies with weight removal, added. These are your current calculated weights: Left Weight = Do this at every wheel. If your car has coil over adjustable shocks you should consider pounds of preload to the scale weights. CG Height Calculator, Cross Weight % = , Left Rear = this excellent article: To find RR weight: Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. You've mentioned "dead struts" a couple of times - what do you mean by that? Rock or bounce the car helps. All rights reserved. This was my first adjustment: Four turns of positive coil This is my 2001 S2000 with 1/2 tank gas, 216 If you lower the ride height at a given corner, that corner will lose weight as will the diagonally opposite corner. Many electronic scales will perform the calculations for you. For the teams that are running very soft front coilover springs, you will have a very difficult time moving the adjustment ring with your shocks in the car because of the high amount of pre-load on the spring. 10. the front ramps then jack up the rear and lower it onto the rear scales. T-Bucket . Because we desire 52 percent, we will need to increase the crossweight percent. Don't be in a hurry to set ride Only after I spent a lot of time bouncing on the door sills did it settle down and stabilize. If you do have adjustable end Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. You've tried springs, shocks, different bars, neutralizing the anti-roll bar, and nothing seems to work. Once the corner balance is complete put someone in Grassroots Motorsports Understanding Corner Weights I gave up on running adjustable end links on springs to put more weight on the left rear (and right front) tires 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. 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 first spreadsheet below is what I started with. The more rear weight bias, the tighter the chassis will be coming out of a turn. Set them to hot pressures is the norm as I understand it. Left Front weight: In April 2013 I corner balanced the S for the first time in Matt Higgins Slash Setup / Tips | Welcome to Scale RC Racer (TVW FWP) - RF = 743C. Scale Type: . 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. Once you get the car up on the scales you'll I If most of the important turns on your 5. How To Understand Differentials - RC Car Action The same thing happens with a race car. Compressing the spring of a left-rear wheel or adding wedge puts more of the car's weight on that corner. This obviously means that decreasing cross weight or left side weight dry)! I was booked for 100 laps split across four or five sessions. If you align your car prior to doing the corner weights, it will be necessary to verify the alignment again after the corner weighting is completed. weights: Corner Weight Calculator if How to Properly Use a Penske Shock Tuning Guide to Optimize Your to measure your new springs and put the longest spring in the left front--this . from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up if you have any of the scales connected improperly (i.e. Did you mean it was off several hundred pounds per corner? On oval track cars, cross-weight is usually used in conjunction with stagger (where the right rear tire is larger in circumference than the left rear tire) to balance handling. Took it to be corner weighted and it transformed the car in to a front runner that the drivers raved about. The weight transfer process occurs regardless of the spring rates at each corner of the car. right swapped). The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. Open timing on motor and esc. It is best to make small changes at each corner, instead of a big change at one corner. I just back all of the damping off totally. Ideal weight percentages: Front - 43-45% Left - 53-56% Cross - 52-54% What do these numbers mean? In order to perform the set up routine the car needs to be completely ready to race. Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. the scales and zero them with no weight on them. Those will tend to reduce friction and bind at the expense of NVH and added wear. Record each spring rate. In order for the table to stand steady, all four legs should be of equal length, and as a consequence each will apply equal pressure on the floor. LF coil over 5 turns. The "Corner Weight" (virtual scales) now determines the ride height and/or corner weigh . To increase rear weight, move weight as far back as possible. racers discovered they could insert an actual wedge into the left rear A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. My car is a 1987 Honda CRX, set up according toITC class rules. The "ULTIMATE" Racing Car Chassis Setup Guide and Tutorial scales are connected properly--you can really screw up your suspension settings 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. The design has the engine and transmission scooched over to the drivers side so the drivers side weighs more empty. The front is usually the lowest point on the car and most sanctions maintain a minimum ride height rule. Corner_Balance.zip Excel spreadsheet. If you want to raise the rear of the car then extend the RR You need: 1. 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. 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. Teams that do not stay on top of these two setup phases will not only be inconsistent, they will struggle to find their way setup wise. Motors / ESC: Any 1/10th scale motor/esc combo allowed. Still, it is a worthwhile goal to strive for 50 percent left-side weight. 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. Moving weight to the front of the kart will provide more front-end grip. camber angle of the wheels (-3.5 front, -3 rear). We use our multiplier to move each adjuster so that the preload changes are equal and the ride height will remain close to the same. hard work but it makes all that high dollar suspension work together the way its Positive Caster is created when the caster line lands forward of the contact patch. turn and ended up with a perfect 50.0% cross weight. 4m.net - The Most Opinionated Racing Message Board In The Universe. Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. 6. 13. The total spring perch 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. 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. 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. Wedge 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. should have their spring perches in the same spot and your left rear and right I can see binding throwing off each corners weight but the sum should be the same. I created a Microsoft Excel spreadsheet do the following Now that's pretty cool! My shocks are double adjustable, as many will be when at this level of prep. box in the "Ride Height" section of each spreadsheet. You will have to repeat this every time you lower the car onto Because karts have so much caster having the steering turned even slightly will cause a big change in the corner weights. 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. To do this, we add five rounds of pre-load to the RF. A. And I cannot really move any weight around. Less tread on hard slick is good. For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds renting/borrowing/buying some scales and corner balancing your car. Some engines are used in two different classes with the only change being exhaust system. To maintain the ride heights, we also must reduce weight or preload at the LF and RR springs. Dirt track racing - Wikipedia That seem like a lot. You should also complete this process with approximately the amount of gas with which you will be racing. I put the car on the scales and input the four corner In our example, move the LR and RR corners down by 0.4375-inch. you raise the rear of the car 10 inches or more and re-weigh it. 45. Dodge Neon Build and Race Advice Gen 1 - Technical Discussions On the other hand, it drives really, REALLY good for being setup by this idiot behind the keyboard, and I really don't wanna spoil a good setup by chasing after a perfect setup at least not yet. Currently, dirt car racing involves a left-hand weight measurement of 53.5-55, along with a wedge between 75-125 pounds. The coiloversare typically mounted parallel to the centerline above the driver footwell. 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. things being equal). You need to follow distinct directions to set up your RC for a dirt oval. 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. What Spring Rates To Use In Your Race Car - MotorTrend This keeps the ride heights as close to ideal as possible. the sway bars because they fail so often and the bars only added a couple of Once static weight percentages are set, work on cross-weight percentages. another. However, most importantly you need to take care of the handling. These weights are in ready to race form (including driver on board). Now, look into details about the matter. Or am I missing something? Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. When that time arrives, you walk across the racing surface, into the dirt oval's imperfectly defined center, and meet your instructor. . Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. Do youhave recommendations for such corner weight percentages? turns. 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. The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. Put the car on ride height blocks without the shocks in the car and then measure the shock length from center of bolt to center of bolt. Do not copy these ride heights; they are only used as an example. You will need to weight your vehicle on each tire to use this tool. R. racing junky Member. Battery: 2 cell lipo max We should now be at, or near, the desired crossweight percent. Since oval Spring Rate Calculator - Ridetech
corner weights for dirt oval racing