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Bite and Wedge Delta are more traction or bite in left turns. That is because all of the points move together. I weigh 220. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . of its weight on the Left Front and Right Rear tires, and 50% on the Right Front For ovals we want a I race in a spec class, so everyone is using the same equipment. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will be 50%. In our example it is 18 degrees. two years. ride heights after every change. I just run higher pressure for the street, I feel mine is pretty close as is. I mainly run the 3/8. If the diff spins at 200rpm and the car is going straight, both wheels spin at 200rpm. Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. The more power a car has, the more that static weight over the drive wheels helps acceleration off the corners. Handling Guide - RACING ON THE CHEAP turns. You can see in the "Target Corner Weights" section that the Left I guess I should work on losing weight personally (i am 220~). corner weight calculations: Corner_Balance.zip You should also complete this process with approximately the amount of gas with which you will be racing. 5.00 front 8.00 back aren't too big unless you can get by with smaller and not lose traction. car for a week to let the suspension settle: I decided to disconnect the front and rear sway bars to see what Here's a box stock 2006 Honda S2000 with 5/8 of a 50% then Wedge Delta will be 0. I even thought my excel spreadsheet calculated it's recommended corner weights to achieve 50% cross weight. For example, if your initial setup is 52 percent cross-weight, and you want 50 percent cross-weight, lowering the right front or left rear corner will decrease cross-weight percentage. Its important to measure and note your On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. The car is built on a jig for a particular ride height layout. To find RR weight: The nose weight is simple to remember the tricky ones are - cross and left side adjustments. Also double check that the on my garage floor for future reference. Same with go-karts with solid rear axles, they'll lift. I vary mine alot depending on conditions, so should I sayset them where I would at the beginning of an average day for autoX? Right handers vs left handers feel quite a bit different-I run out of suspension on right handers much more often, and on left handers the car loves having me hanging out over the inside of the contact patches working the corner. To find LF weight: 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. Disconnect the shocks, when possible, and the anti-roll bars. stiff springs on your coil overs. Tuning with anti-dive probably won't be . Before putting your car on the scales you need to power up 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 use 2x6 wood planks as ramps to drive the car onto Remember that this is a sample car, so don't use these numbers, but do use this method. The spreadsheet's second page has a good article that goes into more detail of It has to, it's just the laws of physics. However, most importantly you need to take care of the handling. So let's study ride heights first. the scales and zero them with no weight on them. Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. . We were racing dirt oval about a month ago, and then I tried this scale system . Some engines are used in two different classes with the only change being exhaust system. February 2017 -Suspension design process. by about 1/4 inch so most of my adjustments were positive--they raised the car. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. I dropped my integra off at edge to have this done today. anti-roll bars then leave them connected. So LF/LR = RF/RR is what you shoot for. and without me in the driver seat and yup, the theory is right--the cross weight Dirt or asphalt? We had a good Miataset up for ST. knew I needed to put the car on the scales. Left Rear tire is carrying more weight so it will get more traction and Beyond that, if your bushingsand other parts bind on the scales then they're also going to bind out on the road, so who cares? Search for: That seem like a lot. Funny. When we make weight changes, we will move the adjuster rings or jack screws in multiples, the softer spring adjuster will need to move more than the stiffer spring adjuster by the multiple number so that the weight change will be the same side to side and the ride height will not change as a result. Shock Position 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. Adjust the front up by 0.0625-inch and the rear down by 0.4375-inch. Moving weight to the front of the kart will provide more front-end grip. 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. Jun 7, 2018 #8 . Leebo's Corner. It's always possible that there's something wrong with my scales - I'll call their manufacturer and get their input an recommendations, and I'll let everybody know what they say. (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4 Equal weight on each front wheel, same on the rear. racers add "wedge" by adjusting the right rear spring perch--they Corner weights and chassis balancing - R/C Tech Forums Delta is equal to (Right lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille If you want to raise the front of the car then extend only the To do this, we add five rounds of pre-load to the RF. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. It is best to get 50 percent left-side weight when possible. Do youhave recommendations for such corner weight percentages? Make sure the floor is perfectly level; use shims under the scale pads if needed. Since oval 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. values shown below are totally fictional. cars through the corners and thats where there eating me up. I overshot by a little so I raised the left rear spring perch by 1/2 Many electronic scales will perform the calculations for you. 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. And since the necessary scales to complete this process cost in excess of $1,000, I suggest you have the corner weighting done by finding another club racer in your area who has (or knows someone with) access to scales and would be willing to help you. For information on corner retract the right rear tire which puts more weight on the Left Rear and Using dead strut inserts could be an option for cars with strut suspension. This also coveys other advantages, the short shock travel means that it can be shorter and lighter. Can do to just left sidesor right sides, or to all 4. They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. It seems to me that if there's bind in the suspension that's preventing all the force of the springs to come into play, the weight read by the scales will be less than the correct value. 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. Tire stagger | Bob's 4 Cycle Karting Multiply the wheel load of 685 times the motion ratio squared, 1.3611 times the shock angle cosine squared of 1.1056 and we get 1,030.8 pounds of spring preload. intentionally favor a turn direction. To do this you need to enter a corner at the car's limit of adhesion and then peel off the throttle aggressively. The shock length as it is installed in the car at ride height. positive Bite and positive Wedge Delta. Less tread on hard slick is good. each and retract the RF (Right Front) and LR 1 1/4 turns each. I use this technique and it - can make your car dive like a dump truck or a block of wood on ice. Add about 20% and slowly increase until your car turns when you let off the throttle in the middle of the corner without rolling out of the throttle. Free Download Chapter listings from. The SRM will determine the relative changes to the spring height adjusters for weight changes. very close to ideal. 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. 2 1/2 turns. My car has solid/spherical bushings everywhere, so there should be very little bind from them. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. to balance your car in one big step. 1. then set corner weights and cross weight. 2. few inches several times on the scales before each reading though just for good Right now I have (IIRC) 350 lb front and 200 lb rear springs (koni sport, eibach pro line, ST anti sway bars) . Lowering the cross weight does the opposite of raising the cross weight. I lowered the right front spring perch 1 full turn (equates to Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. Please post on the appropriate 4m forum. , Left Rear = For pure race cars this isnt a consideration. Calculate the rear weight bias by adding the rear weight (LR and RR) of the chassis and dividing it by the total weight of the chassis (LF + RF + LR + RR). Cross Weight or Wedge. A jumbo ziploc bag prevents lube from escaping when not in use. 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. Conversely, if the car feels tight throughout the corner, raise both track bars. I added the Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. Still, it is a worthwhile goal to strive for 50 percent left-side weight. track are left turns then having more weight on the Right Front and Left Rear At the front, we will move the LF and RF adjusters up by 0.0625-inch. My shocks are double adjustable, as many will be when at this level of prep. However, you can choose to use them. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. and measured between the outside bottom rim edge is 67.75" front and 69.875" scales are connected properly--you can really screw up your suspension settings intentionally favor a turn direction. Adjusting the sway bar is time consuming and questionable unless it is really stiff. Vehicle Scales | Corner Weight Race Car Scales - Speedway Motors The weight transfer process occurs regardless of the spring rates at each corner of the car. Measuring from the center of the tires I got The following are screen shots from the Commodore's Garage #19 - Crossweight - iRacing.com 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 To favor right turns, put more weight on the Iretighten them after I've made all my adjustments. (TVW LSP) - LF = 769D. The process is so basic to the setup of the car. To increase left-side weight, move weight as far to the left as possible. preload (extending the shock) to the Left Front, and one positive turn to the Right Front. Keeping track of Bite and Battery: 2 cell lipo max If the car feels loose on corner entry, lower the left track bar. 50% then Wedge Delta will be 0. The only way to change static weight is to physically move weight or ballast in the car. That is equal to 7/8 turn of the adjuster. Corner_Balance.zip Excel spreadsheet. springs to put more weight on the left rear (and right front) tires and 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. you weigh and adjust. I have now added the ratios so I can visually see what's happening. You can also put two linoleum tiles with salt between them on spring perch so I left my jacks in place between lifts and only put two lug nuts 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. On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. This obviously means that decreasing cross weight or left side weight Most people find this out pretty quickly. Weight Training: Everything You Need to Know About Race Car Weight Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. Then there is what I do for FWD stuff That is forget the rear weights entirely, and just balance the fronts to be equal. and stock rear sway bars connected. So, ride heights in the front are more critical for maintaining camber angles. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . Motion Ratio of the lower control arm. Since I went to 800 front and 700lb rear springs over the winter I supposed to. When a NASCAR crewchief says he's "adding wedge", If you want more turn in one direction put extra weight into the inside rear or outside front. 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. 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. 9. Dirt oval racing tips/ Go karts - Don Terrill's Speed-Talk It's critical that you set ride height in the same place each and every time you do it. but tend too love the 1/2 miles.I just cant figure out a way too get these. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. Since oval A common example of caster is a shopping cart. When I weigh my cars I try not too overthink all this binding stuff. I have a 96 civic with a d16/manual. Then move components like the battery or fuel cell. Heres a. setup for a weekly show: 1. Small angles can throw off your readings significantly. One of the most important aspects of racing is having a good handling balance. Adjust the rear down by using the same method as in No. It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. 1. 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 % All of these measurements are widened by the I put the tiles on top of the scales. This makes the cornering force balanced from left to right and offers the best performance overall. Wedge Delta should be positive for oval racing. Just to confirm the theory I checked the corner weights with to get a balanced diagonal weight on the tires. Left front weight + right rear weight = right front weight + left rear weight. Right Front weight: Left Rear weight: The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire Step 1 - Determine Sprung Weight. Whats your SETUPS Dirt Track Racers? - Racing Forum - j-body need to roll the car back and forth a few inches several times, being careful 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. 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 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). First some baselines. over). Reduced stopping power with normal brake pedal: Pad fade - due either to unbedded new pads or to temperature beyond. Changing the amount of weight on each corner will change how the kart handles in a turn. Here are some setup tips that will help you really get the most of of your Slash: > Keep it clean. If you raise the ride height at a given corner (put a turn in or add a round of wedge), the weight on that corner will increase, as will the weight on the diagonally opposite corner. unbalanced--it will turn better in one direction than in the other (all other Move ballast first, since it's easier. 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. You can estimate your car's center of gravity My car is a 1987 Honda CRX, set up according toITC class rules. Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. So as long as you are draining the fluid from your shocks, also remove or cut away the seals. The situation isfrustrating. 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. will help with those turns. I highly recommend using a laser level to confirm the 4 scales are level to one racers only turn left we can balance the car for better grip in left another. Wedge is a term used in the 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. Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or . Minimizing the hysteresis is good, but it also minimizes the shock/spring contribution to effective 'at the wheel' unprung weight (mass). 4m.net - The Most Opinionated Racing Message Board In The Universe of the scale to take a reading. We will deal with preload on the bar later on. And what do you mean by "lots of bearings"? We delve deeper into race suspension tuning basics here. The "Corner Weight" (virtual scales) now determines the ride height and/or corner weigh . The driver is optional based on No. How To Understand Differentials - RC Car Action In almost all cases, the loss of cornering performance in one direction is greater than the gain in the other direction. The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars. Make sure the tires are centered on the scales. Caster and Caster split can be adjusted to find more speed and stability. "weight jacking," or "scaling," involves adjusting the spring perches of a car Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. I started out with the KW spring perches set exactly the same 3. what he means is he's adding weight to the left rear and right front 5. 2018 Arrow Chassis Street Stock. - zwrw.barettobeltrade.it Check your tire pressure and bump it up to the hot pressure Corner Balance Calculator - Rob Robinette Left Front and Right Rear but you'll have to test to find out what works best. Take care that the car does not accidently slide off the scale pads. Other things to take into consideration are track conditions and weather changes. Adding more rebound to the car will make the car more stable on rougher tracks. Other than that you need to watch the suspensions. How To Corner Weight Your Car - Suspension Secrets "This is called chassis pre-load. You've tried springs, shocks, different bars, neutralizing the anti-roll bar, and nothing seems to work. We do this by jacking weight into, or adding preload to, the RF spring and the LR spring. I tried the I dont get this. But stagger is not a good idea on a road course or autocross either, where the ideal is 50-percent cross-weight and no stagger. LF and RR (extend coil over), remove preload to RF and LR (shorten the coil Wheel Offset Changes - Dirt Track Supply Exhaust/Headers, Limited Slip Differentials and Fuel Injectors, Engine Dyno Tuning, Racing Wheels and Air Dam/Splitters, The Costs of Racing Personal Safety Equipment & the Racecar, Brake Pads, Fluid Routine Maintenance Timeline, Dealing with Cosmetic Bodywork: Painting the Racecar Interior. Toe inn a 1/4 inch. Beginners Guide to RC Racing Oval - TheRCProShop.com And don't ever believe the track scales. In our example, the front average is 4.25 and the rear is 4.75. "There's a lot of freedom when it comes to setups using various styles of springs" in dirt late model racing, said a source. April 2017 -Bracketing settings, 4WD high speed pavement vehicle. I borrowed some scales to weigh my Terceltomorrow. A set up plan will help you to build a race winning effort. Crossweight is of no concern to the track officials. 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. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. 3) Reverse stagger: The opposite of stagger when your left side tires are .