height and the shocks set to the exact same spring perch height You would be amazed at how much bushing twist can contribute on your suspension. Left Front weight: Determine your ride heights. Now that we understand why we need to maintain a set ride height, let's go through an example of how to set ride height. 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. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . RC Oval racing is probably the easiest form of RC racing right, right? Dirt Late Models. 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. scales. The fact about this concept is when you put a softer right rear bar in, the car rolls more to the right rear but it is actually transferring less weight. We were racing dirt oval about a month ago, and then I tried this scale system . important for cars with upgraded (stiffer) sway bars because they can exert a Caster Creativity - JOES Racing Products If you have 50/50 weight distribution to begin with the note that crossweighting will do the exact same thing. It varies with weight removal, added. Motor: 550 or 540 motors only. I used a laser level to project a horizontal 10. Matt Higgins Slash Setup / Tips | Welcome to Scale RC Racer It's better to make many small changes than to try Tire stagger | Bob's 4 Cycle Karting I run generally 34F/30R for the street and usually (again depending on the day) drop the fronts to around 30~ and the rears to 26 or 28. Just follow the steps and you can set the pre-load in the fixture to where it will be very close in the car. If you lower the ride height at a given corner, that corner will lose weight as will the diagonally opposite corner. I needed 3 tiles on the left front and 1 on the left rear CG Height Calculator, Cross Weight % = Now that we understand the value in maintaining ride heights, just what heights do we want? Always try to start with the track bars first. shouldn't match the front to the rear but your left front and right front shocks Still, it is a worthwhile goal to strive for 50 percent left-side weight. Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. not to push it off the scales, to unload the suspension (as the car is March 2017 - F1 suspension rules, independent rear suspension for dirt oval. Vehicle Scales | Corner Weight Race Car Scales - Speedway Motors A stiffer spring on one corner equals more weight transfer to that corner. If your car has coil over adjustable shocks you should consider The situation isfrustrating. 2 coils cut off springs 4 corners. We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. You need to follow distinct directions to set up your RC for a dirt oval. 2. 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. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. 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. 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. box in the "Ride Height" section of each spreadsheet. spring perch so I left my jacks in place between lifts and only put two lug nuts Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. on each wheel to speed shock adjustment. Corner Balance - Rob Robinette For ovals we want a Any corner weight adjustments that you make will impact the alignment of your car. Do this at every wheel. First off, you must maintain the legal ride height to pass tech. Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. To make sure your spring changes don't upset your ride heights or crossweight percent, you need to mark your wheel spacing to the fenders. The "ULTIMATE" Racing Car Chassis Setup Guide and Tutorial LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. So if you have 60% on the front , you should have 30% on each front wheel. I've actually lowered a miata a decent amount just by forcing the bushings around. Of course you can add too The Science Behind Dirt Late Model Suspension Setup If one leg is longer or shorter than the others, the table will rock and thus be unstable. That math gives us a percentage number to . Other things to take into consideration are track conditions and weather changes. Front + Left Rear) - (Left Front + Right Rear) and tells us how much I was surprised to find, contrary to my experience, that the Vette came is very close to itsexpected weight as soon as it was let down on the scales, without having to take bind out of the suspension. 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. Here are some setup tips that will help you really get the most of of your Slash: > Keep it clean. 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. 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. The roll center is an imaginary point around which the rear of the race car rolls. I weigh 220. Did you mean it was off several hundred pounds per corner? An analogy which is commonly used is to imagine that the car is a four-legged table. racers discovered they could insert an actual wedge into the left rear Understanding corner weights. Basically - after you finish the set up routine, the car goes in the hauler. Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. center of gravity (CG) height by using this page: bite, a negative value means the Right Rear is favored. Then move components like the battery or fuel cell. 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. Or am I missing something? Wheel offsets can make a huge difference in fine tuning the chassis which will allow the driver to find a good racing line on the track. No, not as in the law, but in being legal in tech. The spreadsheet's second page has a good article that goes into more detail of The ultimate goal is to find the balance that will eventually lead to faster lap times. Unsure about autox. Bite = Left Rear - Right Rear and a positive value means the 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. are favoring the left rear tire for better acceleration out of left Calculate the spring rate multiples. If you want to lower the front of the car then retract only stiff springs on your coil overs. Bite and Wedge Delta are Maybe there's some sort of bind in the scales. ride heights after every change. 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? rod movement from the wheel to the coilovermovement. Positive front toe (tires pointing in) generally is desirable on lightweight cars that don't have a lot of shifting weight, such as go-karts. suspension). I use 2x6 wood planks as ramps to drive the car onto To increase left-side weight, move weight as far to the left as possible. When Wedge is balanced at Doing the multiplication to square that number, we get 1.1056. To calculate cross-weight percentage, add the RF weight to the LR weight and divide the sum by the total weight of the car. It is best to get 50 percent left-side weight when possible. Bite = Left Rear - Right Rear and a positive value means the 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. A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. It is best to make small changes at each corner, instead of a big change at one corner. Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. Less tread on hard slick is good. Classic Truck. I stretched my tires to get the RR right and now I'm . 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. There's Nothing In Racing Simpler-or Harder-Than Driving a Sprint Car I can see binding throwing off each corners weight but the sum should be the same. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . In our example it is 18 degrees. You've tried springs, shocks, different bars, neutralizing the anti-roll bar, and nothing seems to work. Now that's pretty cool! you run on the track. "This is called chassis pre-load. weights and percentages and generates target wheel weights to achieve a 50% I was booked for 100 laps split across four or five sessions. Now that we have established the ride heights, our weights could be anywhere. I used a laser level to project a horizontal Here is what you do. Caster creates stability as the geometry . Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. from a balanced Cross Weight. This makes the cornering force balanced from left to right and offers the best performance overall. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. How To Corner Weight Your Car - Suspension Secrets springs settled over the first 3 months. To find LF weight: 4 Things You Should Never Do In A Front-Wheel Drive Car What is Wedge in Dirt Racing? How Can it be Fixed? - Southern Reaceway Fans For high banked tracks, the front spring rate must be increased and it is often necessary to. important for oval racers, especially on dirt ovals. I dont get this. At the time Honda was still favoring their home market I reckon. the scales and zero them with no weight on them. These are your target weights which will yield a 50% Cross Weight: Left Front = Setting Ride Height & Corner Weight - Circle Track Magazine - MotorTrend < Enter your corner weights in pounds or kilos and click 'Calculate'. . 4. retract the right rear tire which puts more weight on the Left Rear and And what do you mean by "lots of bearings"? Corner Weight Calculator | GTSparkplugs Circle Track Analyzer - Performance Trends and stock rear sway bars connected. The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. 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. Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at . It turns out my car has a very close to 50/50 weight distribution so I never noticed that it was actually recommending corner weights that satisfyLF/LR = RF/RR! You've mentioned "dead struts" a couple of times - what do you mean by that? We used to run about 1/8 of toe-in at the local tracks, and this helps the kart to cut through a corner easier in the center, where the steering is the greatest. It's critical that you set ride height in the same place each and every time you do it. . The nose weight is simple to remember the tricky ones are - cross and left side adjustments. Even 1/8 inch difference will make a difference, especially if you have Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. 57.5" front and 59.625" rear. racers only turn left we can balance the car for better grip in left There are many ways to corner balance a car. right swapped). You can We have 4.1875 front and 5.1875 rear. Weight Distribution Theory | Bob's 4 Cycle Karting Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. of the scale to take a reading. I see disconnecting the sway bar, and how to do it, but disconnect the shocks? I put the car on grease tiles so the tires move freely on the scales and then I bounce each end a couple times. Search for: (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) Take the cosine of that angle, divide it into 1.0 and then square it, or multiply it by itself. 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. battery (-15lbs), ride height lowered approximately 1 inch, all 4 Bilstein PSS9 coil over Dirt Track Chassis Set-up At The Rear For Cornering - Auto-Ware Small angles can throw off your readings significantly. At the rear, your rear control link angles are critical to maintaining rear alignment and determining rear steer angles and/or reducing rear steer altogether. While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. When a NASCAR crewchief says he's "adding wedge", Disconnect the sway bar. Open timing on motor and esc. That is why it gets tighter. I installed The only way to change static weight is to physically move weight or ballast in the car. Race Tires: Are You Ready to Spend Some Money? in the driver's seat to load the suspension. I highly recommend using a laser level to confirm the 4 scales are level to one Changing the ride height at any corner will change the cross-weight percentage. Find the difference from the desired average ride heights. Adjust the cross weight for more extreme conditions or different circumstances. hard work but it makes all that high dollar suspension work together the way its 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. Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. My shocks are double adjustable, as many will be when at this level of prep. You could also raise the left front or right rear ride heights to do the same thing. Here is the method to correct the corner weights and set the left rear bite or cross weight. Funny. The other two corners will lose weight. 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