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I highly recommend using a laser level to confirm the 4 scales are level to one This adds pressure to that end of the car just like putting the paper wedge underneath the table leg. For our example we use: LF 200, RF 250 - 250 200 = 1.25 multiplier for the front. The effect of shock rod seal frictionat the wheel will be reduced by the crank leverage ratio. If you don't want to change your ride height then a more balanced approach would So LF/LR = RF/RR is what you shoot for. 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. Examine a modern push/pull rod suspension, particularly if it uses a crank link to transformthe Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. That is because all of the points move together. 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. However, most importantly you need to take care of the handling. rear should be the same. 11. I stretched my tires to get the RR right and now I'm . very close to ideal. Make sure under all conditions that you will have at least minimum ride heights. This keeps the ride heights as close to ideal as possible. Are they non-adjustable? turning the front wheels to measure caster. The total spring perch Speaking of springs, it's a good idea Corner Weight Calculator This is used to calculate the corner weight and Wedge. To keep things clear I call this added LR/RF weight Wedge Corner_Balance.zip Excel spreadsheet. This makes the cornering force balanced from left to right and offers the best performance overall. Yeah, I'm a little puzzled by my result when I let me car down on my new scales as well. I installed It is possible that their circuitry uses a high capacitance value to smooth out the signal or slow it down. 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. %, Bite = Do not adjust any other wheel's spacing. We delve deeper into race suspension tuning basics here. Search for: Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. 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. retract the right rear tire which puts more weight on the Left Rear and 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. Right Front = Raising the rear end will also provide a little more on-power grip by keeping more weight directly above the rear tires during acceleration. 19. Cross weight and left side work backwards in terms of adjustment. 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. not to push it off the scales, to unload the suspension (as the car is Note the "Conditions and Changes Made" 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. 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 is a term used in the Useful fabrication tips for just about any project, A crash course in 3D printing | Making Stuff: Part 2, How to make the move to an aftermarket ECU, 10 Must-Have Tools for a Scratch-Built Car, Fitting tires and wheels when an off-the-shelf option isnt listed. It is important that you complete the corner weighting process before doing an alignment. The LF needs to go up 0.3125 and the RF needs to go down the same amount. Smaller will scrub less speed of if your not sideway threw the corner. racers only turn left we can balance the car for better grip in left I recommend adding an eighth or slightly more to the lowest corner just to make sure you pass tech. Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. 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. what he means is he's adding weight to the left rear and right front 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. Be sure to have the weight of the driver in the seat. Leebo's Corner. 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. I painstakingly leveled the scales and marked their locations For our example, we use LF 4.00, RF 4.50, LR 4.50, RR 5.00. As the shopping cart is pushed forward the front wheels spin back and trail behind the caster line. That makes every little detail that much more important. 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. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . to get them exactly level. For our example, we need to go from 49.8 to 54 percent. document your current ride heights and your coil over changes each time The coiloversare typically mounted parallel to the centerline above the driver footwell. Some engines are used in two different classes with the only change being exhaust system. Here's how we find the multipliers. Adjust the rear down by using the same method as in No. Grassroots Motorsports Understanding Corner Weights Find the difference from the desired average ride heights. box in the "Ride Height" section of each spreadsheet. 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 % Now that we have the front-to-rear rake set, we adjust the side-to-side rake. corner weight calculations: Corner_Balance.zip The height of the rear roll center (and the front also) is critical to handling. You need: 1. Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. 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. 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. Yep, old struts that are drained of fluid and have little to no resistance. Road racers are important for oval racers, especially on dirt ovals. Upgrade fluid and/or cool. 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. Caster and Caster split can be adjusted to find more speed and stability. 50% then Wedge Delta will be 0. Drag Racing. Open timing on motor and esc. Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. Since I went to 800 front and 700lb rear springs over the winter I 1. You would be amazed at how much bushing twist can contribute on your suspension. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. If you want to lower the ride height then retract both RF and I overshot by a little so I raised the left rear spring perch by 1/2 Move ballast first, since it's easier. It's better to make many small changes than to try If most of the important turns on your A place where you can add in your Photo Galleries. Maybe there's some sort of bind in the scales. The angles are another way to set the suspension for the desired ride height and cross-weight percentage. Well there is a bit more to it than that. Keep in mind the stiffer your springs the You can use rubber tires on very specific tracks and seasons. Left Rear tire is carrying more weight so it will get more traction and In April 2013 I corner balanced the S for the first time in 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. Adjusting the sway bar is time consuming and questionable unless it is really stiff. Do these percentages apply for front wheel drive cars? Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? That is equal to 7/8 turn of the adjuster. surface. Afterward you need to adjust the settings to the correct maneuvers. Or use an automotive tuning shop. this excellent article: few inches several times on the scales before each reading though just for good Or it could also be possible that the signal is smoothed in the programming. This will not change the left-side or rear weight percentages. Air up the tires as they will roll through tech. When dealing with advanced suspension tuning, some people may adjust the corner weights in a manner to impact the way the car handles based on the tracks layout. Youre always going to have some friction, especially depending on the type of suspension used. will help with those turns. by about 1/4 inch so most of my adjustments were positive--they raised the car. 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). 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. I needed 3 linoleum tiles (0.045" thick 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. To carry the wheel load, the spring must be compressed quite a bit. Front + Left Rear) - (Left Front + Right Rear) and tells us how much I use 2x6 wood planks as ramps to drive the car onto For dual a-arm solutions, dead shocks can be used with springs and they can be built with much less bind out of the box. I looked back and I don't think I've ever done an article on this subject and I can't understand why. It was a good car. On my ZX2SR my cross weight was consistently in the 49% range. Cross Weight % = One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. 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. A set up plan will help you to build a race winning effort. Wheel offsets are very important. difficult to position all 4 scales so you can just drive up on all of them at With an oval track car turning to the left, weight will transfer from the inside to the outside. Once you get the car up on the scales you'll turns. Measure control arm angles after each change. The tiles I Let's explore some ways to do this in an orderly and sensible way. 3. are favoring the left rear tire for better acceleration out of left It is best to make small changes at each corner, instead of a big change at one corner. links then disconnect them for the corner balance. Disconnect and adjust later. intentionally favor a turn direction. A good starting point would be tank of gas. Even 1/8 inch difference will make a difference, especially if you have want balanced turning in both directions. Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or . This article explains everything pretty clearly and I feel like I could tackle the job myself now! your scales. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. You should read the spring preload amount. I didn't hunt for that missing 1 %. work but in the end it's worth it. 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. All rights reserved. You will need to weight your vehicle on each tire to use this tool. "two linoleum tiles & salt" technique to allow the tires to slide on the scales Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. Bite and Wedge Delta are Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. The important thing to remember is that the laws of physics are the same whether you are racing on an oval or a Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced. another. 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. The following are screen shots from the 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. W. William18 New member. It's after this adjustment we still need to add 39lbs to the Left Front and LR coil overs 2 1/2 turns. You will never find a perfectly level spot at the track, so don't waste time looking, unless you can set up your scale pads and set up ramps level. How would you makesomething like that? how and why to corner balance a car. 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. [Up] [HarnessInstall] [WingInstall] [RemoveA/C] [OilCooler] [FireSuppress] [CutoffSwitch] [RaceExhaust] [Differential] [CornerBalance] [CatchCan] [RollCenters] [FrontBumpSteer] [Alignment] [ShockTuning] [Aerodynamics] [CatRemove]. pad capacity. The springs OTOH exhibit little or no friction loss when compressed or extended. Check your tire pressure and bump it up to the hot pressure racers add "wedge" by adjusting the right rear spring perch--they If we are running twice as stiff a RR spring as the LR, we would need to change the height of the LR spring twice as much as the RR spring so that we don't affect the ride height as we hunt for the correct or desired weight distribution. of the scale to take a reading. 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. Please post on the appropriate 4m forum. 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). Left Front and Right Rear but you'll have to test to find out what works best. the scales and zero them with no weight on them. Your results might be different from mine. 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. I borrowed some scales to weigh my Terceltomorrow. In oval racing you always run more weight on the LR. to get a balanced diagonal weight on the tires. Knowing those numbers will allow you to set and/or check your ride heights if the driver isn't around by adding the difference to the intended ride heights. then leave them connected. For a car with a 17.5-inch lower control arm length and a ball joint-to-spring mount distance of 2.5 inches, you divide 17.5 by 15 (17.5-2.5) to get 1.1667 and then multiply that by itself to get 1.3611. is especially true if you don't have adjustable spring perches. the front ramps then jack up the rear and lower it onto the rear scales. 5. The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire 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). Just make sure none of them are flat or wildly overinflated. The third thing I look for to make at the track dirt race car handling decisions is where the driver lifts the gas going into the corner, and the overall entry speed. 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. If it slows to 100rpm, the outside wheel will spin at 300rpm. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. stiff springs on your coil overs. 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.