Astrut with its innards removed? the scales. I have now added the ratios so I can visually see what's happening. Do not copy these ride heights; they are only used as an example. Just make sure none of them are flat or wildly overinflated. Jun 7, 2018 #8 . Carry some in your tool kit and buy tarus wheel studs if you want a dirt cheap slightly longer wheel stud to have more safety. When Wedge is balanced at
Wedge Delta and what values work best for certain tracks and conditions
I put the tiles on top of the scales. Left Rear tire is carrying more weight so it will get more traction and
The CG height
suspension changes to track your progress. My starting cross weight was 50.6%, I was off 7lbs
Andy Hollis does this. used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales
2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. More wedge means that the car will likely understeer more in a left turn. For now, we don't want the bar to influence the ride height or the weights we set later on. Find a fairly level spot and mark on the ground with duct tape or marker where the tires sit on the ground. They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. Rear weight percentage for road racing and autocrossing is less definite. So let's study ride heights first. Battery: 2 cell lipo max Smaller will scrub less speed of if your not sideway threw the corner. For pure race cars this isnt a consideration. 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. 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). 2. your scales.
Kart Scaling & Weight Distribution - Woodbridge Kart Club 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. Grassroots Motorsports Understanding Corner Weights
I've had my cars corner balanced a lot, but never really looked into the science of it. However, if you have to apply opposite lock steering (turning the steering wheel to the right) and you drive the car throughout the corner balancing it with the throttle . two years. When looking at corner weighting, the cross weight (diagonal weight) is the most important component. I tried the
All rights reserved. knew I needed to put the car on the scales. Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. Rock or bounce the car helps. A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. rod movement from the wheel to the coilovermovement. 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. the same time. another. I found that the tire will absorb side loads quite well and was repeatable. from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up
The height of the rear roll center (and the front also) is critical to handling. You cannot change the left or rear percentages by jacking weight around in the car, although this will change cross-weight. Caster creates stability as the geometry . 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. A 50% Cross Weight will yield a balanced handling car, one
each and retract the RF (Right Front) and LR 1 1/4 turns each. The driver is optional based on No. However, many cars cannot make the 50 percent left-side weight percentage due to driver offset. Today's oval
Corner Balance - Rob Robinette will help with those turns. Less tread on hard slick is good. important for oval racers, especially on dirt ovals. At least for road racing. Right Front tires. 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. This adds pressure to that end of the car just like putting the paper wedge underneath the table leg. 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. The process is so basic to the setup of the car. Drag Racing. right swapped). after this adjustment we still need to add 39lbs to the Left Front and
much Wedge Delta and make the handling worse. I use 2x6 wood planks as ramps to drive the car onto
We had a good Miataset up for ST. 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. 2 1/2 turns. You can make this adjustment in several ways: If you don't want to change the ride height of the car then
what he means is he's adding weight to the left rear and right front
Take care that the car does not accidently slide off the scale pads. 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. Don't be in a hurry to set ride
The front is usually the lowest point on the car and most sanctions maintain a minimum ride height rule. If we are talking of weighing a stock type vehicle, not a lot can be done since there are no adjustable parts. When a NASCAR crewchief says he's "adding wedge",
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. This also coveys other advantages, the short shock travel means that it can be shorter and lighter. 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. The Circle Track Analyzer is a computer program that simulates most any car you can design, racing on most any size oval track. The roll center is an imaginary point around which the rear of the race car rolls. In order to perform the set up routine the car needs to be completely ready to race. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: .
RC Dirt Oval Car Setup & Tuning Guide [5 Key Steps] At the front, we will move the LF and RF adjusters up by 0.0625-inch. 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. It's
Corner weighing will tell you how much overall mass your car has as well as the mass present at each wheel. 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. Dirt or asphalt? about 1/8" of wheel movement) to reduce the weight on the right front and left
turns. Once the corner
You need a nice, flat and level surface for the scales. tires. this excellent article:
For our example we use: LF 200, RF 250 - 250 200 = 1.25 multiplier for the front. I
Get the numbers right and the percentages will follow. balance is complete put someone in the driver seat and reconnect the
Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. 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. Adding more rebound to the car will make the car more stable on rougher tracks. That is because all of the points move together. box in the "Ride Height" section of each spreadsheet. Yeah, I'm a little puzzled by my result when I let me car down on my new scales as well. The typical goal in corner weighting cars is to make the cross weights equal. Adjust the cross weight for more extreme conditions or different circumstances. the scales.
Spring Rate Calculator - Ridetech front left and
For our example, we need to go from 49.8 to 54 percent. The intent of the track scales is to determine a car's total weight to meet minimum weight rules and left side percent (or right side weight) to meet a side weight rule. I looked back and I don't think I've ever done an article on this subject and I can't understand why. ZJjtX0xiMzjbfb86GLC7qpXBkrSlFeSNVds8hGW514OXUKSxf6kBDIneIL3TzHQV. So, we are not reinventing the wheel here, just refining the process. For information on corner
of the scale to take a reading. Disconnect and adjust later. The situation isfrustrating. 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. 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. All of these measurements are widened by the
lowered onto the scales the tires will need to spread out to unbind the
LF coil over 5 turns. Choose a level spot in your setup area. Or am I missing something? 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. Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. 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. I usually mark an even inch and write that inch number on the tape.
Kart WHEEL BALANCE - www.KartPartsDepot.com It's the effective distribution that changes when you have suspension bind. That is why it gets tighter. Once static weight percentages are set, work on cross-weight percentages. Firstly, you need to balance out your RC. Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. 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. upgrading our street stock suspension part 2 the rear end. 2023 Motorsport Marketing. On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. 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. Right Front weight: Left Rear weight:
The SRM will determine the relative changes to the spring height adjusters for weight changes. "two linoleum tiles & salt" technique to allow the tires to slide on the scales
Jacking weight will not alter the left side or the rear percentages. pounds of preload to the scale weights. Bite and Wedge Delta are
weights: Corner Weight Calculator if
on my garage floor for future reference. height and corner balance new springs. Get the rear percentage as close to the manufacturer's specs as possible. It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. You will have to repeat this every time you lower the car onto
The more rear weight bias, the tighter the chassis will be coming out of a turn. This was a very interesting post to me. Once you get the car up on the scales you'll
Guess I have to try it. You need: 1. 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. Right now I have (IIRC) 350 lb front and 200 lb rear springs (koni sport, eibach pro line, ST anti sway bars) . If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. weights and percentages and generates target wheel weights to achieve a 50%
In our example, the front average is 4.25 and the rear is 4.75. No, not as in the law, but in being legal in tech. The cosine of 18 degrees is 0.95106, and that into 1.0 is 1.05146. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. will help with those turns. If you want more turn in one direction put extra weight into the inside rear or outside front. Oval Track. 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. 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. Or use an automotive tuning shop. that turns equally well in both directions.
Circle-Track Setup: What Is Toe, And Why Should You Use It? How NASCAR Wedge Adjustments Work | HowStuffWorks 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. section). - Use blocks the same height as your scale pads to move the car off the scales to make adjustments. Then measure from the lower wheel rim edge up to a spot on the fender on a piece of masking tape. Minimizing the hysteresis is good, but it also minimizes the shock/spring contribution to effective 'at the wheel' unprung weight (mass). suspension). R. racing junky Member. 4. 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? Wedge is a term used in the
I installed
oval racing world and is simply another word for Cross Weight. then set corner weights and cross weight. Yeah generally its the same stagger 9/10 times. LR = left rear. you weigh and adjust. 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. If the car feels loose throughout the corner, lower both track bars evenly. 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. Use a load of fuel for where you you want the car balanced, either at the start of the race, the end of the race or an average between the two. Also double check that the
Interested in hearing peoples' opinions and (preferably) experiences. 2.
How To Set Up RC Dirt Oval A Guide - Explained! Comet Kart Sales - Karting 101 - Getting Started in Kart Racing (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4
I
Some engines are used in two different classes with the only change being exhaust system. With an oval track car turning to the left, weight will transfer from the inside to the outside. The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. "If your car is really tight or really loose during hot laps, you have to take a look at the things that are going to make the biggest difference. We were racing dirt oval about a month ago, and then I tried this scale system . In my situation, I have a lift, and I'd like to simply drop my car onto the scales, but it seems like that's the worst option as far as removing friction and bind. Scale Type: . 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. Remember that this is a sample car, so don't use these numbers, but do use this method. Other than that you need to watch the suspensions.
Dirt Track setup - heymow.com
racers add "wedge" by adjusting the right rear spring perch--they
Calculate the average existing ride heights front and rear. calipers. 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). I didn't hunt for that missing 1 %. 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. A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. Moving weight to the front of the kart will provide more front-end grip. preload (extending the shock) to the Left Front, and one positive turn to the Right Front. That's all total speculation though. 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. Let's explore some ways to do this in an orderly and sensible way. turns. To increase left-side weight, move weight as far to the left as possible. Put the driver weight in the car, preferably the driver. 12. difference that made.
Beginners Guide to RC Racing Oval - TheRCProShop.com Just follow the steps and you can set the pre-load in the fixture to where it will be very close in the car. the same time. You've tried springs, shocks, different bars, neutralizing the anti-roll bar, and nothing seems to work. I have a 96 civic with a d16/manual.
Mudboss Setup #3 - Traxxas Slash transmission setup and diff - YouTube turn and ended up with a perfect 50.0% cross weight.
Vehicle Scales | Corner Weight Race Car Scales - Speedway Motors
We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. February 2017 -Suspension design process. At the time Honda was still favoring their home market I reckon. These are your current calculated weights: Total Weight = Front Weight = % Left Weight = % Right Weight = % Rear Weight = % Cross Weight = 50% is optimal Bite = Bite should be positive for oval racing Wedge = % Wedge Delta should be positive for oval racing 45. TVW CWP FWP or, 2,800 0.52 0.51 = 685B. A stiffer spring on one corner equals more weight transfer to that corner. You would be amazed at how much bushing twist can contribute on your suspension. 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. It would just automatically settle. Using dead struts and lots of bearings will help. 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 our example it is 18 degrees. 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. but tend too love the 1/2 miles.I just cant figure out a way too get these. 7. Of course you can add too
scales are connected properly--you can really screw up your suspension settings
per wheel. Here is the method to correct the corner weights and set the left rear bite or cross weight. I needed 3 tiles on the left front and 1 on the left rear
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. can help us get our setup right with less testing. in left hand turns than in right turns. Once you get the car up on the scales you'll
That is equal to 7/8 turn of the adjuster. For our example we have LF 3.625, RF 4.75, LR 4.625, RR 5.75. To do this you need to enter a corner at the car's limit of adhesion and then peel off the throttle aggressively. Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. and stock rear sway bars connected.
Road racers are
I use this technique and it
8 Read the ride heights as they exist. To truly optimize your shocks, your overall suspension setup must be right, including ride height, camber, caster, toe, and the correct spring rates. Take the cosine of that angle, divide it into 1.0 and then square it, or multiply it by itself. springs to put more weight on the left rear (and right front) tires and
How To Be Fast With Front-Wheel Drive: An Expert Explains - Jalopnik Corner weighting can be a complicated process for you to complete without someone who is experienced helping you. I just back all of the damping off totally. 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. Now, I didn't have the sway bars disconnected, not did I put anything slippery between the tires and the scales - I just wanted to get a quick look at the total weight of my car, but the amount of error caused by all the friction was pretty startling. dry)! which is simply the difference between the two diagonal tire weights. 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? tires. 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.