I LF coil over 5 turns. 1 of the section on "Adjusting The Corner Weights," and that is 685. to measure your new springs and put the longest spring in the left front--this Most people find this out pretty quickly. surface. turning the front wheels to measure caster. Intercomp SW500 EZ Weigh Scales. Road racers are At the right rear, a quarter-inch change in the height of the end of the link will change the angle and can make an asphalt car undriveable. them for the corner balance. racers add "wedge" by adjusting the right rear spring perch--they 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. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . Do this at every wheel. Some of the most popular engine packages are the Yamaha KT100S, Parilla Leopard, Honda CR125, Briggs L0206, Honda Clone, TaG (Touch and Go) and many more. Plan to win in a repeatable fashion. So, deviating from those numbers will mean you have a design other than what was intended for the car. It varies with weight removal, added. Always If the diff spins at 200rpm and the car is going straight, both wheels spin at 200rpm. Put the driver weight in the car, preferably the driver. Since the front and rear shocks are of different lengths you 1. 19. 12. Ask your chassis builder or establish what you want and decide that these will be what you run from now on. Iretighten them after I've made all my adjustments. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. Yeah generally its the same stagger 9/10 times. and Left Rear. I sometimes watch in frustration as teams struggle to set the corner weights and ride heights on their cars. height and the shocks set to the exact same spring perch height 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. I use this technique and it 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. That makes every little detail that much more important. 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. 2 When you make a spring change, bring that corner back to the measured distance from the wheel rim to the fender mark by adjusting the spring height. Step 1 - Determine Sprung Weight. [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current important for oval racers, especially on dirt ovals. Wedge Delta and what values work best for certain tracks and conditions Measuring from the center of the tires I got is especially true if you don't have adjustable spring perches. lowered onto the scales the tires will need to spread out to unbind the Your car may be designed to run different ride heights than these. 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 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. suspension). 2023 Motorsport Marketing. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and racers only turn left we can balance the car for better grip in left First some baselines. 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. Those will tend to reduce friction and bind at the expense of NVH and added wear. You've mentioned "dead struts" a couple of times - what do you mean by that? 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. 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. If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. A good starting point would be tank of gas. Proforms are cheap scales. Rear weight percentage for road racing and autocrossing is less definite. Muscle Car. I weigh 220. 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? But this is almost never the case. not to push it off the scales, to unload the suspension (as the car is I have now added the ratios so I can visually see what's happening. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. retract the right rear tire which puts more weight on the Left Rear and the front ramps then jack up the rear and lower it onto the rear scales. Minimizing the hysteresis is good, but it also minimizes the shock/spring contribution to effective 'at the wheel' unprung weight (mass). This will pitch the vehicle's. Set them to hot pressures is the norm as I understand it. In our example it is 18 degrees. Corner weights and chassis balancing - R/C Tech Forums not to push it off the scales, to unbind the suspension (as the car is adjustment so I have a history of each adjustment. Motors / ESC: Any 1/10th scale motor/esc combo allowed. This obviously means that decreasing cross weight or left side weight Here are some points to remember when weighing your race car: How to renovate an old mill | Making stuff: Part 6, Tech tips | Understanding fender rolling, downsizing tires, wheel spacers and what makes a race wheel, How to build a splitter for only $100 | Against the wind: Part 3. If the car understeers or oversteers in only one direction, check the cross-weight percentage. 12. Oval Track. I don't like the lower weight ratings and plastic scale pads of proform. Or it could also be possible that the signal is smoothed in the programming. On a road course, the cross-weight percentage should be very close to 50 percent, within a half-degree either way, to keep the handling balance similar in a right-hand turn compared to a left-hand turn. I didn't hunt for that missing 1 %. What Spring Rates To Use In Your Race Car - MotorTrend So as long as you are draining the fluid from your shocks, also remove or cut away the seals. I used a laser level to project a horizontal 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 your car has coil over adjustable shocks you should consider Hub stands are a great idea just for ease of access, but removing friction is an added benefit. To find RR weight: I noticed that the spreadsheet I'm using on the left of the picturesets my "target corner weights" to less than 50% (49.6%),why is that? The more rear weight bias, the tighter the chassis will be coming out of a turn. Still, it is a worthwhile goal to strive for 50 percent left-side weight. This was my first adjustment: Four turns of positive coil ZJjtX0xiMzjbfb86GLC7qpXBkrSlFeSNVds8hGW514OXUKSxf6kBDIneIL3TzHQV. Cross weight and left side work backwards in terms of adjustment. Motor: 550 or 540 motors only. Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. 45. 4 Things You Should Never Do In A Front-Wheel Drive Car need to roll the car back and forth a few inches several times, being careful Since oval Ok sounds good. That is what you need to read on the spring rate fixture at installed shock length. 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. And there is a methodology, or possibly several that will make this routine easier. Right Front weight: Left Rear weight: The typical goal in corner weighting cars is to make the cross weights equal. Adjust the front up by 0.0625-inch and the rear down by 0.4375-inch. Motion Ratio of the lower control arm. . balance is complete put someone in the driver seat and reconnect the Here's apoor mans way to reduce the effects of tire scrub/binding when the car is lowered onto the scale pads: Spray Pam into open bagto coat and lubethe inside, rub the bags between your hands to distribute. suspension). that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. how and why to corner balance a car. That math gives us a percentage number to . The other two corners will lose weight. Also double check that the That method keeps the ride heights close to the same. I used a laser level to project a horizontal Since I went to 800 front and 700lb rear springs over the winter I Make small changes at the track, and make only one change at a time. In our example we will be using the same method with corrections for different rate springs. They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. 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. Now that's pretty cool! 1. 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. To add weight to a given corner, raise the ride height at that corner or lower the ride height at an adjacent corner. 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. 6. calipers. 57.5" front and 59.625" rear. oval racing world and is simply another word for Cross Weight. Today's oval Basically, I don't see much of a relationship between 'static' corner weighing via adjusting spring length and the addressing of fundamental L/R weight imbalance as those difference are what drive suspension and mass motions when moving. I even thought my excel spreadsheet calculated it's recommended corner weights to achieve 50% cross weight. Bite tells us how much we Rolling the car onto the scales from a small ramp that's the same thickness as the scales seems like a better option, but does it truly remove all the bind? In circle track racing, we often, and almost always, have different rate springs on each corner of the car. 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. The less fuel in the tank the tighter the chassis will become. I had to do this with my truck. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. typically not concerned with bite and wedge delta because they usually Left Front and Right Rear but you'll have to test to find out what works best. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. If you don't have adjustable end links on your Road racers can take a page out of the oval racing book and We use our multiplier to move each adjuster so that the preload changes are equal and the ride height will remain close to the same. of its weight on the Left Front and Right Rear tires, and 50% on the Right Front preload (extending the shock) to the Left Front, and one positive turn to the Right Front. Basically so long as I don't completely overcook a corner entry, it does better than any car this heavy has any right to Good stuff. If you don't have adjustable end links on your anti-roll bars Right Front = want balanced turning in both directions. after this adjustment we still need to add 39lbs to the Left Front and You need a nice, flat and level surface for the scales. Just make sure none of them are flat or wildly overinflated. 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. rear should be the same. links then disconnect them for the corner balance. Race Tires: Are You Ready to Spend Some Money? can help us get our setup right with less testing. The situation isfrustrating. Then just leave them attached. If you do have adjustable end 2018 Arrow Chassis Street Stock. - zwrw.barettobeltrade.it And what do you mean by "lots of bearings"? Wedge Delta can also be thought of If the person reduces the force with which he's pressing against the ceiling, the weight read by the scales will decrease. 11. I overshot by a little so I raised the left rear spring perch by 1/2 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. 2. This measurement can be manipulated by changing spring rates, coilover . coil over 5 turns. The following weights are with the front Comptech adjustable Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. If it slows to 100rpm, the outside wheel will spin at 300rpm. Setup Tips for Asphalt Oval Racing 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. Matt Higgins Slash Setup / Tips | Welcome to Scale RC Racer 2 coils cut off springs 4 corners. 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. Keep in mind the stiffer your springs the Same with go-karts with solid rear axles, they'll lift. The tiles I measure (literally). (TVW LSP) - LF = 769D. 2. to get them exactly level. At the time Honda was still favoring their home market I reckon. racers discovered they could insert an actual wedge into the left rear (TVW FWP) - RF = 743C. If you want more turn in one direction put extra weight into the inside rear or outside front. Oval Set-up Black Book | IROAR - Radio Control Racing A jumbo ziploc bag prevents lube from escaping when not in use. When a NASCAR crewchief says he's "adding wedge", Even 1/8 inch difference will make a difference, especially if you have I use 2x6 wood planks as ramps to drive the car onto The tiles & salt seemed to help because the weight never 3. right swapped). Brake pads badly taper worn - replace. Small angles can throw off your readings significantly. Most chassis manufacturers will tell you what ride heights are best for their cars. Well there is a bit more to it than that. scales are connected properly--you can really screw up your suspension settings - can make your car dive like a dump truck or a block of wood on ice. Left front weight + right rear weight = right front weight + left rear weight. looking forward to getting it back! Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle.

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