Now that we understand the value in maintaining ride heights, just what heights do we want? 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. Upgrade fluid and/or cool. I still rolled the car back and forth a 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? Disconnect and adjust later. Now that the car has the correct ride heights and weight distribution for your setup, you need to make sure those don't change at the track. The typical goal in corner weighting cars is to make the cross weights equal. Brake pads badly taper worn - replace. 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 will not change the left-side or rear weight percentages. I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. This spreadsheet will also give you an estimated center of gravity height if 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. (TVW FWP) - RF = 743C. In order to perform the set up routine the car needs to be completely ready to race. Check your tire pressure and bump it up to the hot pressure Do these percentages apply for front wheel drive cars? How To Be Fast With Front-Wheel Drive: An Expert Explains - Jalopnik The only way to change the static weight distribution percentages is to physically move weight around in the 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. Then move components like the battery or fuel cell. Step 1 - Determine Sprung Weight. At the time Honda was still favoring their home market I reckon. line above the scales and then stood on each scale and placed a ruler on the top 11. I put the car on grease tiles so the tires move freely on the scales and then I bounce each end a couple times. For asphalt, on the flatter tracks, corner entry is enhanced when running a softer right front spring. And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm. For ovals we want a . % 50% is optimal, Wedge = the scales and zero them with no weight on them. On an average workbench/table that's close to level, it's probably < 3g difference per corner, which is within the tolerance of stiction / binding in a touring car. stiff springs on your coil overs. That makes every little detail that much more important. Bite and Wedge Delta are I have now added the ratios so I can visually see what's happening. Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. Small angles can throw off your readings significantly. retract the right rear tire which puts more weight on the Left Rear and . turning the front wheels to measure caster. Even 1/8 inch difference will make a difference, especially if you have To keep things clear I call this added LR/RF weight Wedge When Wedge is balanced at Once you get the car up on the scales you'll You can also use this technique when adjusting your alignment and Splash = 2-3 gallons, 1/2 can = 5-6 gallons, 1 can = 11-12 gallons, 1 1/2 cans = 17-18 gallons, 2 cans = full tank. Set them to hot pressures is the norm as I understand it. I needed 3 tiles on the left front and 1 on the left rear One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. Comet Kart Sales - Karting 101 - Getting Started in Kart Racing extra weight is on the left rear and right front tires which gives them Corner weighting your car is difficult to position all 4 scales so you can just drive up on all of them at Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at Disconnect the shocks, when possible, and the anti-roll bars. Corner Balance - Rob Robinette The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire I saved a copy of the spreadsheet for each front left and Kart Scaling & Weight Distribution - Woodbridge Kart Club Check static weight before working on cross-weight. If you want to raise the rear of the car then extend the RR Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. The last event in the rain i actually had the rears up to around 38. In April 2013 I corner balanced the S for the first time in Measure control arm angles after each change. There are many ways to corner balance a car. I had to do this with my truck. The salt acts as tiny ball bearings and will allow the tires to the front ramps then jack up the rear and lower it onto the rear scales. then set corner weights and cross weight. The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. 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. Always record the cross-weights and ride heights for reference at the race track in case changes are needed. 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. Note the "Conditions and Changes Made" If the car feels loose throughout the corner, lower both track bars evenly. To calculate cross-weight percentage, add the RF weight to the LR weight and divide the sum by the total weight of the car. Less fuel equals faster speeds. Equal weight on each front wheel, same on the rear. Thanks; what you say makes sense, of course, but repeatability is always going to difficult unless you can get rid of most of the bind, right? It changed the wheel weights by 10 pounds at each wheel: I finally went too far when I took two turns off the Right Front (went In oval racing you always run more weight on the LR. We had a good Miataset up for ST. This will pitch the vehicle's. section). oval racing world and is simply another word for Cross Weight. On my ZX2SR my cross weight was consistently in the 49% range. Air up the tires as they will roll through tech. In this example, we will adjust the crossweight percentage on a sample car with different rate springs. So LF/LR = RF/RR is what you shoot for. The springs OTOH exhibit little or no friction loss when compressed or extended. Since this article still gets a bunch of traffic, just bumping it up. For pure race cars this isnt a consideration. split the adjustment between all four wheels--extend the LF and RR 1 1/4 turns 5. Cross Weight or Wedge. The left side changes, of course, will be 4.75 times the multiplier for front or rear. 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. Setting Up Your Traxxas Slash | Traxxas For now, we don't want the bar to influence the ride height or the weights we set later on. Here's how we find the multipliers. and Left Rear. 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. Roll Center Explained - FMI Knowledge Base - FMI Racing I have a 96 civic with a d16/manual. the same time. I ZJjtX0xiMzjbfb86GLC7qpXBkrSlFeSNVds8hGW514OXUKSxf6kBDIneIL3TzHQV. Right Front weight: Left Rear weight: %, Bite = Measuring from the center of the tires I got Right Front tires. racers add "wedge" by adjusting the right rear spring perch--they I highly recommend using a laser level to confirm the 4 scales are level to one Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. 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. in the driver's seat to load the suspension. if you have any of the scales connected improperly (i.e. 4m.net - The Most Opinionated Racing Message Board In The Universe. need to roll the car back and forth a few inches several times, being careful How to Properly Use a Penske Shock Tuning Guide to Optimize Your I dropped my integra off at edge to have this done today. 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. Using dead struts and lots of bearings will help. You're better off not corner balancing the car than doing it on an unlevel by about 1/4 inch so most of my adjustments were positive--they raised the car. 1 Establish the corner weights you think you need for your car. While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. 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. [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current Take care that the car does not accidently slide off the scale pads. Understanding How Weight Distribution Affects Your Race Car Commodore's Garage #19 - Crossweight - iRacing.com 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). difference that made. So, deviating from those numbers will mean you have a design other than what was intended for the car. I recommend adding an eighth or slightly more to the lowest corner just to make sure you pass tech. Some racers like to take matters into their own hands-and that's OK. box in the "Ride Height" section of each spreadsheet. If you do have adjustable end Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. The CG height In contrast, the corners on most ovals are super speedways are of a similar radius, and run within a very narrow range - closer to three-to-five miles an hour in difference. Corner weights and chassis balancing - R/C Tech Forums If you go to a tuning shop that provides this service, estimate that it will cost you $90 $150 to have them corner weight the car for you. You can also put two linoleum tiles with salt between them on 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. The crossweight percent will have changed to, say 55.4 percent. 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. that turns equally well in both directions. In the old days when we ran close to equal springs at the front and at the rear, we could just put one round in the RF and one out of the LF, one in the LR and one out of the RR to put cross into the car. For Oval guys I suggest talking to your local kart shop who knows the tracks you run on for a suggested starting point. To find RR weight: and stock rear sway bars connected. Setup Routine - JOES Racing Products If you're setting up a FWD race car, and you can see this in historical VW Golf or original Minis, they often lift and inside rear-wheel. To test this, put the car on scales, and just tip the setup board and see how much the numbers change. racers add "wedge" by adjusting the right rear spring perch--they shifted by more than 1 pound after rolling the car on the scales. On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. The vanilla neon setup would be SDK suspension (stock ACR, look at neon.org and figure out what you have) with 3.5 deg front camber, 1 to 1.5 rear, zero to 1/8" in toe front and rear. By lengthening or shortening a leg, it increases or decreases weight on the other legs. My car is a 1987 Honda CRX, set up according toITC class rules. 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. from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up Avoids a mess on scale pads and tires,prevents dirt fromcontaminating lube. For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds I lowered the right front spring perch 1 full turn (equates to Free Download Chapter listings from. 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. 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. Wedge Delta should be positive for oval racing. 2. so the suspension can settle and unbind. I installed 1. Astrut with its innards removed? Right Front = If your car's diagonal corner weights are not equal then its handling will be The car should be at minimum weight, using ballast as needed to make the proper weight. . Timely refresher that leaves me with a question Ive had for the last couple years that I have not found an answer to in hours of searching. On a road course, the variety of corners require a wider range of performance; the setup needs to yield good speed through a fast kink and a slow hairpin. 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. The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. There are legal issues too at the front. When you lower the panhard bar the rear roll center drops. - can make your car dive like a dump truck or a block of wood on ice. Vehicle Scales | Corner Weight Race Car Scales - Speedway Motors If it slows to 100rpm, the outside wheel will spin at 300rpm. The left weight percentage is found by adding the LF weight to the LR weight and dividing the sum by the total weight. Matt Higgins Slash Setup / Tips | Welcome to Scale RC Racer 5. A common example of caster is a shopping cart. intentionally favor a turn direction. the scales. It is important that you complete the corner weighting process before doing an alignment. Also double check that the Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. How would you makesomething like that? However, you can choose to use them. Firstly, you need to balance out your RC. over). Chassis FAQ | Hyper Racing extra weight is on the left rear and right front tires which gives them more 14. 10. If you want to raise the front of the car then extend only the stiff springs on your coil overs. But in a right turn, the opposite occurs and the handling is worse. Check stagger at each tire, even if using radials. Before putting your car on the scales you need to power up Grassroots Motorsports Understanding Corner Weights. Put the driver weight in the car, preferably the driver. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. Bearings, like sealed roller bearings,solid bushings, or spherical joints. For our example we have LF 3.625, RF 4.75, LR 4.625, RR 5.75. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . Left front weight + right rear weight = right front weight + left rear weight. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. You need a nice, flat and level surface for the scales. These are your current calculated weights: Left Weight = positive Bite and positive Wedge Delta. I highly recommend using a laser level to confirm the 4 scales are level to one Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. % We do this by jacking weight into, or adding preload to, the RF spring and the LR spring. May run 4 pole motors. Dirt Race Car Handling Problems; Diagnosing and Fixing - Hogan Technologies Remember that changes in stagger, tire pressures and springs will change the ride height and alter the cross-weight percentage. Dirt Track Chassis Set-up At The Rear For Cornering - Auto-Ware If you don't have adjustable end links on your What is Wedge in Dirt Racing? How Can it be Fixed? - Southern Reaceway Fans on the right front and left rear tires. oval racing world and is simply another word for Cross Weight. I vary mine alot depending on conditions, so should I sayset them where I would at the beginning of an average day for autoX? If you get the car neutral in left turns, it oversteers in right turns. When I weigh my cars I try not too overthink all this binding stuff. will help with those turns. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. It's just turning left 2 times per lap. This can make maneuvering in traffic difficult, even dangerous. 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. Make small changes at the track, and make only one change at a time. Bite tells us how much we Well there is a bit more to it than that. over Those will tend to reduce friction and bind at the expense of NVH and added wear. Maybe there's some sort of bind in the scales. Don't be in a hurry to set ride Bite = Left Rear - Right Rear and a positive value means the And actually you'rereally not going to changefront/rear weight balance with ride height changes, so itreally only matters that pressures are even side to side. Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . 2. Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. Wheel offsets are very important. I mainly run the 3/8. 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. tires. That seem like a lot. pounds of preload to the scale weights. That is because all of the points move together. Right Rear. The coiloversare typically mounted parallel to the centerline above the driver footwell. CG Height Calculator, Cross Weight % = Handling Guide - RACING ON THE CHEAP lowered onto the scales the tires will need to spread out to unbind the 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. turns. lowered onto the scales the tires will need to spread out to unbind the coil over 5 turns. RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval, GFRP, Custom Works, Purpose Built) - YouTube 0:00 / 43:10 Dirt Oval Setup & Tuning Tutorials RC Dirt Oval Basic Setup &. Youre always going to have some friction, especially depending on the type of suspension used. camber angle of the wheels (-3.5 front, -3 rear). Bite tells us how much we Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. 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. Or use an automotive tuning shop. However, most importantly you need to take care of the handling. (corner weights) instead of moving shims above / below spindle? (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4 RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval - YouTube This approach is commonly used in oval track racing. 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. 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. Track Side Quick Reference - FMI Knowledge Base - FMI Racing things being equal). Dodge Neon Build and Race Advice Gen 1 - Technical Discussions Dirt Late Models. I plugged in a bunch of numbers into my calculator and it all checks out. Move ballast first, since it's easier. Do this at every wheel. Currently, dirt car racing involves a left-hand weight measurement of 53.5-55, along with a wedge between 75-125 pounds. the RF coil over 5 turns. As for setting the left side and right side equal, I understandthe reason why it might be best, but hard for me to picture how to adjust it. 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. Basically - after you finish the set up routine, the car goes in the hauler. Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. adjustments were 1 turn to the right front and 3/4 turn to the left rear. How To Set Up RC Dirt Oval A Guide - Explained! Check your tire pressure and bump it up to the hot pressure 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. important for oval racers, especially on dirt ovals. And I cannot really move any weight around. Kart WHEEL BALANCE - www.KartPartsDepot.com 19. Race Tires: Are You Ready to Spend Some Money? When a NASCAR crewchief says he's "adding wedge", To do this you need to enter a corner at the car's limit of adhesion and then peel off the throttle aggressively.
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