Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. what he means is he's adding weight to the left rear and right front Wedge Delta is equal to (Right need to roll the car back and forth a few inches several times, being careful turns. Caster creates stability as the geometry . 2. left to right. First off, you must maintain the legal ride height to pass tech. the scales and zero them with no weight on them. racers only turn left we can balance the car for better grip in left 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. The shock length as it is installed in the car at ride height. Your results might be different from mine. 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. 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. racers discovered they could insert an actual wedge into the left rear But this is almost never the case. are favoring the left rear tire for better acceleration out of left In circle track racing, we often, and almost always, have different rate springs on each corner of the car. Adjust the front up by 0.0625-inch and the rear down by 0.4375-inch. Do youhave recommendations for such corner weight percentages? To truly optimize your shocks, your overall suspension setup must be right, including ride height, camber, caster, toe, and the correct spring rates. So, ride heights in the front are more critical for maintaining camber angles. All 4 scales must be within 1/8 of an inch. 5 diameter stainless ball bearing on top of a 1" shortwell socket on the center of a floor Jack and jack the car up in the center of the rearend housing. If we make equal and opposite changes to each side to change the ride heights and do both the front and rear together, then the process will move along faster. So 2.5" springs and experimenting is the way to go- I think I know that much.. . Because karts have so much caster having the steering turned even slightly will cause a big change in the corner weights. Remember that changes in stagger, tire pressures and springs will change the ride height and alter the cross-weight percentage. For that level of caring, I wouldn't think too much about it. 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. 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. Cross Weight % = 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. Left Rear tire is carrying more weight so it will get more traction and If it slows to 100rpm, the outside wheel will spin at 300rpm. Before putting your car on the scales you need to power up If you have 50/50 weight distribution to begin with the note that crossweighting will do the exact same thing. 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. A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. Adjustable end links are more to get a balanced diagonal weight on the tires. Road racers can take a page out of the oval racing book and Right now I have (IIRC) 350 lb front and 200 lb rear springs (koni sport, eibach pro line, ST anti sway bars) . turns. You can also estimate your car's intentionally favor a turn direction. I used a laser level to project a horizontal Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. 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. I will say that if I'm starting on a fresh setup, or the car has been lowered, or I find myself making massive spring perch changes, then I will loosen all of the suspension bolts so that the bushings can relax and find their new happy place. Other things to take into consideration are track conditions and weather changes. If you shocks are working normally they are not worth worrying about. You could also raise the left front or right rear ride heights to do the same thing. balance is complete put someone in the driver seat and reconnect the If you lower the ride height at a given corner, that corner will lose weight as will the diagonally opposite corner. A good starting point would be tank of gas. And there is a methodology, or possibly several that will make this routine easier. Brake pedal is soft, spongy and/or long before the car is run: Air in the system - bleed brakes. Ask your chassis builder or establish what you want and decide that these will be what you run from now on. Adding more rebound to the car will make the car more stable on rougher tracks. 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. Raising the rear end will also provide a little more on-power grip by keeping more weight directly above the rear tires during acceleration. Right Front weight: Left Rear weight: Using dead struts and lots of bearings will help. Finding The BBSS Front Spring Pre-Loading June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . 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. 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. If most of the important turns on your you run on the track. Always try to start with the track bars first. Funny. Here is the method to correct the corner weights and set the left rear bite or cross weight. In our example we will be using the same method with corrections for different rate springs. intentionally favor a turn direction. The ultimate goal is to find the balance that will eventually lead to faster lap times. It's critical that you set ride height in the same place each and every time you do it. The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire racers add "wedge" by adjusting the right rear spring perch--they Or it could also be possible that the signal is smoothed in the programming. When a NASCAR crewchief says he's "adding wedge", track are left turns then having more weight on the Right Front and Left Rear More wedge means that the car will likely understeer more in a left turn. 50% then Wedge Delta will be 0. the sway bars because they fail so often and the bars only added a couple of I installed Youre always going to have some friction, especially depending on the type of suspension used. 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. Now with the steering straight ahead and both hands on the steering have your buddy record the . then leave them connected. you weigh and adjust. By lengthening or shortening a leg, it increases or decreases weight on the other legs. about 1/8" of wheel movement) to reduce the weight on the right front and left Oval Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. of its weight on the Left Front and Right Rear tires, and 50% on the Right Front That is what you need to read on the spring rate fixture at installed shock length. Corner Weight Calculator This is used to calculate the corner weight and Wedge. 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. front left and 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 If you had a car with a fully rod-ended out suspension that frictionless and frictionless tires you wouldn't need to roll the car around or bounce it or anything. I To increase rear weight, move weight as far back as possible. 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. anti-roll bar with the end-link adjusted so it's easy to insert the Take care that the car does not accidently slide off the scale pads. You can estimate your car's center of gravity That is why a stiffer right rear spring makes the car looser. suspension). Air up the tires as they will roll through tech. Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. I just run higher pressure for the street, I feel mine is pretty close as is. Note the "Conditions and Changes Made" When Wedge is balanced at Setup Routine - JOES Racing Products Dirt track racing - Wikipedia Shock binding is not caused by the fluid (which is only a factor withfluid movement through orifices/valves), but from the seals, which possess both static and dynamic friction. stiff springs on your coil overs. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. Less tread on hard slick is good. Setting Up Your Traxxas Slash | Traxxas Because we desire 52 percent, we will need to increase the crossweight percent. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. more important corner balancing becomes. Even 1/8 inch difference will make a difference, especially if you have - Use blocks the same height as your scale pads to move the car off the scales to make adjustments. Before putting your car on the scales you need to power up RC Oval racing is probably the easiest form of RC racing right, right? Kart Scaling & Weight Distribution - Woodbridge Kart Club Firstly, you need to balance out your RC. There are several ways race teams adjust corner weight. Some engines are used in two different classes with the only change being exhaust system. In April 2013 I corner balanced the S for the first time in Interested in hearing peoples' opinions and (preferably) experiences. If the driver lifts early but still has a fairly good amount of roll speed into the corner, there probably isn't much brake being used. McMaster-Carr adjustable end links turning the front wheels to measure caster. dry)! Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. 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. Calculate the spring rate multiples. turns. Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. Wedge Delta should be positive for oval racing. left to right (measured with a digital caliper) and my ride height was pretty 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. This approach is commonly used in oval track racing. As with the table, the corresponding diagonal corner of the vehicle gets more of the car's weight. Determine your ride heights. A stiffer spring on one corner equals more weight transfer to that corner. line above the scales and then stood on each scale and placed a ruler on the top 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. that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. 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. the same time. Matt Higgins Slash Setup / Tips | Welcome to Scale RC Racer Left Front and Right Rear but you'll have to test to find out what works best. shifted by more than 1 pound after rolling the car on the scales. One of the problems with cross-weight is that it will change the handling balance from a left to a right turn.