Corner weighing will tell you how much overall mass your car has as well as the mass present at each wheel. W. William18 New member. In our example it is 18 degrees. I This keeps the ride heights as close to ideal as possible. I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. The "ULTIMATE" Racing Car Chassis Setup Guide and Tutorial Roll Center Explained - FMI Knowledge Base - FMI Racing 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. Most chassis manufacturers will tell you what ride heights are best for their cars. In order to perform the set up routine the car needs to be completely ready to race. I usually mark an even inch and write that inch number on the tape. If the car feels loose on corner entry, lower the left track bar. Today's oval Do not adjust any other wheel's spacing. If you do have adjustable end It's just turning left 2 times per lap. Setup Routine - JOES Racing Products Weight Distribution Theory | Bob's 4 Cycle Karting and Left Rear. Motor: 550 or 540 motors only. LR coil overs 2 1/2 turns. Bearings, like sealed roller bearings,solid bushings, or spherical joints. Beginners Guide to RC Racing Oval - TheRCProShop.com 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. 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. difference that made. 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. A set up plan will help you to build a race winning effort. Get the rear percentage as close to the manufacturer's specs as possible. 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. While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. shouldn't match the front to the rear but your left front and right front shocks Moving weight to the front of the kart will provide more front-end grip. Wedge Delta and what values work best for certain tracks and conditions A. Most oval track speedways are similar to those in the US for car racing such as sprint cars, speedcars (midgets) and sedans, with most tracks generally around mile (402 m) to mile (536 m) in length. Are they non-adjustable? The tiles I Now that we have established the ride heights, our weights could be anywhere. All rights reserved. Note your ride heights and The crossweight percent will have changed to, say 55.4 percent. 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. end-link into the anti-roll bar's hole. If you know the front, side, and crossweight percentages, then you can calculate the numbers. In our example, the front average is 4.25 and the rear is 4.75. I found that the tire will absorb side loads quite well and was repeatable. oval racing world and is simply another word for Cross Weight. However, for dirt oval RC cars, foam tires are the norm. < Enter your corner weights in pounds or kilos and click 'Calculate'. I guess I should work on losing weight personally (i am 220~). If you do have adjustable end links then disconnect Bite should be positive for oval racing, Wedge = What you're saying makes sense, but I can't explain why it took so long for my car to settle into its final weight reading. 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. box in the "Ride Height" section of each spreadsheet. 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. First some baselines. A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. How NASCAR Wedge Adjustments Work | HowStuffWorks Now with the steering straight ahead and both hands on the steering have your buddy record the . Record each spring rate. Brake pedal is soft, spongy and/or long before the car is run: Air in the system - bleed brakes. TVW CWP FWP or, 2,800 0.52 0.51 = 685B. May 2017 -Dirt late model pinning RF & heavy axle tube. You can also use this technique when adjusting your alignment and Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. Caster creates stability as the geometry . My big stumbling block on this subject is how to get accurate readings by removing all the friction/bind from the tires, sway bars, bushings, etc. if you have any of the scales connected improperly (i.e. decided to try 5 turns total of spring perch movement to balance the car. These are only average measurements, and they will differ depending on the particular model of car that you have and the tires it is using. Then the car will move more easily from one setting to another. Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. turns. And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm. Or use an automotive tuning shop. 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. I put the car on grease tiles so the tires move freely on the scales and then I bounce each end a couple times. 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). This allows a slightly lower rear stance, which provides a good weight transfer entering a corner. The only way to change the static weight distribution percentages is to physically move weight around in the car. 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. Iretighten them after I've made all my adjustments. If you don't want to change your ride height then a more balanced approach would %, Bite = racers add "wedge" by adjusting the right rear spring perch--they The car is built on a jig for a particular ride height layout. the front ramps then jack up the rear and lower it onto the rear scales. 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. lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. 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. I started out with the KW spring perches set exactly the same When I weigh my cars I try not too overthink all this binding stuff. Intercomp SW500 EZ Weigh Scales. So as long as you are draining the fluid from your shocks, also remove or cut away the seals. 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. Ah, OK, thanks for the clarification. turn and ended up with a perfect 50.0% cross weight. I dont get this. calipers. dry)! Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. 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. LR = left rear. Corner weights-cross weights - TenTenths Motorsport Forum First off, you must maintain the legal ride height to pass tech. The advantage to wedge is that the left rear tire carries more load, so the car drives off the turns better. I use 2x6 wood planks as ramps to drive the car onto The LF needs to go up 0.3125 and the RF needs to go down the same amount. For our example, we need to go from 49.8 to 54 percent. It is best to make small changes at each corner, instead of a big change at one corner. unbalanced--it will turn better in one direction than in the other (all other Oval racers favor left turns so they typically desire more weight on the right front and left rear tires. Whats your SETUPS Dirt Track Racers? - Racing Forum - j-body 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. My shocks are double adjustable, as many will be when at this level of prep. The tiles & salt seemed to help because the weight never The front is usually the lowest point on the car and most sanctions maintain a minimum ride height rule. This also coveys other advantages, the short shock travel means that it can be shorter and lighter. This is my 2001 S2000 with 1/2 tank gas, 216 "two linoleum tiles & salt" technique to allow the tires to slide on the scales it would help the car turn left and accelerate better. (TVW FWP) - RF = 743C. Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . Vehicle Scales | Corner Weight Race Car Scales - Speedway Motors The less fuel in the tank the tighter the chassis will become. Corner weighting is huge. (adsbygoogle = window.adsbygoogle || []).push({}); If you prefer Microsoft Excel a Corner Weight spreadsheet is available for download here So we multiply the difference, or 4.2 percent, by 1.12 and we get 4.7 rounds of right side change to the spring pre-load, or 43/4 rounds. For ovals we want a the scales. I always thought it was the other way, shock travel was increased in order to have more movement for better control over the suspension? 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. Corner weights and chassis balancing - R/C Tech Forums Many electronic scales will perform the calculations for you. The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire 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. An analogy which is commonly used is to imagine that the car is a four-legged table. 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. You will have to repeat this every time you lower the car onto For ovals we want a 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. not to push it off the scales, to unload the suspension (as the car is 7. spread when the car is lowered onto the scales. We delve deeper into race suspension tuning basics here. All of these measurements are widened by the 2. Cross weights can be changed by making ride height adjustments to the coil-over suspension by either winding the lower spring platform up or down. To favor right turns, put more weight on the 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. You can also put two linoleum tiles with salt between them on rear should be the same. Why? You need to follow distinct directions to set up your RC for a dirt oval. The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. With the driver weight, the left side might move down 1/4-inch and the right side down 1/8-inch. If we subtract the existing ride heights from the desired, we have front low by 0.0625-inch and the rear high by 0.4375-inch. Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. Make sure the tires are centered on the scales. My starting cross weight was 50.6%, I was off 7lbs center of gravity (CG) height by using this page: You need: 1. be appropriate such as making small adjustments to all 4 wheels--add preload to Since this article still gets a bunch of traffic, just bumping it up. Road racers are on my garage floor for future reference. 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. upgrading our street stock suspension part 2 the rear end. Rear weight percentage for road racing and autocrossing is less definite. Today's oval As an autocrosser I've always thought that cross weight should be set at 50% and be done with it. The spreadsheet's second page has a good article that goes into more detail of Right Rear = Battery: 2 cell lipo max When I drive down a strait road the I can clearly feel that the drivers side is heavier over bumps expansion joints and dips and the like. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. I use this technique and it Dirt Late Models. 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. I per wheel. springs to put more weight on the left rear (and right front) tires and Before putting your car on the scales you need to power up It's the effective distribution that changes when you have suspension bind. How To Understand Differentials - RC Car Action When you adjust your coil overs need to roll the car back and forth a few inches several times, being careful Plus it sounds like street and autocross pressures are about the same stagger front to rear, so it really shouldn't have a noteworthy impact. right swapped). anti-roll bars then leave them connected. Measure control arm angles after each change. 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. Adjust the cross weight for more extreme conditions or different circumstances. 2 1/2 turns. I don't like the lower weight ratings and plastic scale pads of proform. 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. Scale Type: . Open timing on motor and esc. Always record the cross-weights and ride heights for reference at the race track in case changes are needed. Find the difference from the desired average ride heights. Don't just blindly cross weight it thinking it's the "right" way. . The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. If you have uneven mass on your wheels then your tyres will all have different levels of grip which can lead to an unpredictable car on circuit and make it corner faster in one direction than the other. 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. Always Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. Free Download Chapter listings from. The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. 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. 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. How To Set Up Your Car for Oval Track Racing - RacingJunk News Corner balancing, sometimes referred to as "corner weighting," Just follow the steps and you can set the pre-load in the fixture to where it will be very close in the car. I Oval Here is what you do. Since oval are favoring the left rear tire for better acceleration out of left You can Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at shocks set to same length left to right (front to rear will be different). 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. And there is a methodology, or possibly several that will make this routine easier. That is why a stiffer right rear spring makes the car looser. 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? Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time.

Robert Craighead Net Worth, Laguna Sports Complex, Articles C