5.00 front 8.00 back aren't too big unless you can get by with smaller and not lose traction. very close to ideal. Just make sure none of them are flat or wildly overinflated. I've read all the info before, in various places, but it's good to have a refresher. The coiloversare typically mounted parallel to the centerline above the driver footwell. If you want to lower the ride height then retract both RF and
Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced.
RC Oval Racing - Indy RC World Small angles can throw off your readings significantly. Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. These tell us all we need to know about the setup relative to the weight distribution. 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 changing the weight distribution on the car, you affect the way your car will behave when cornering. There are legal issues too at the front. The crossweight percent will have changed to, say 55.4 percent. That makes every little detail that much more important. what he means is he's adding weight to the left rear and right front
This approach is commonly used in oval track racing. Don't just blindly cross weight it thinking it's the "right" way. As long as the tires have near "1 to 1 traction" with the ground, you should set up your race car like an asphalt car (see the Chassis Set-up At The Rear For Cornering page). You will have to repeat this every time you lower the car onto
Why? 1. 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). . Please post on the appropriate 4m forum. The car should be at minimum weight, using ballast as needed to make the proper weight. T-Bucket . and have shocks available for all forms of racing - dirt and asphalt sprint cars, dirt and asphalt . 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. 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. 2 1/2 turns. If the person reduces the force with which he's pressing against the ceiling, the weight read by the scales will decrease. Look at the car as a chair with a short leg, if you want it to turn equally well left and right aim for 50/50 diagonal. need to roll the car back and forth a few inches several times, being careful
scales are connected properly--you can really screw up your suspension settings
Intercomp SW500 EZ Weigh Scales. There is a reason for this order. Cross Weight or Wedge. it would help the car turn left and accelerate better. 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 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. Maybe there's some sort of bind in the scales.
Rethink Dirt: Advanced Dirt Track Theory | Hyper Racing My car has solid/spherical bushings everywhere, so there should be very little bind from them. right swapped). For most karts, the following weight distribution is recommended: 43% Front Weight 57% Rear Weight 50% / 50% Left / Right Weight These are just recommended starting points. 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.
How to Adjust iRacing Sprint Car Cross Weight AKA Wedge To help you, here is a method you can use to set the spring height on the shock using a spring rating fixture with coilover ends installed. The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. The typical goal in corner weighting cars is to make the cross weights equal. We have 4.1875 front and 5.1875 rear. intentionally favor a turn direction. Your results might be different from mine. Equal weight on each front wheel, same on the rear. If you don't want to change your ride height then a more balanced approach would
line above the scales and then stood on each scale and placed a ruler on the top
If you do have adjustable end
The nose weight is simple to remember the tricky ones are - cross and left side adjustments. the RF coil over 5 turns. Wedge is a term used in the
Motion Ratio of the lower control arm. from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up
you raise the rear of the car 10 inches or more and re-weigh it. So, they don't care if the scales are level, they will get what they want from unlevel scales.
Corner balancing, sometimes referred to as "corner weighting,"
want balanced turning in both directions. Air up the tires as they will roll through tech. I have a 96 civic with a d16/manual.
Kart Scaling & Weight Distribution - Woodbridge Kart Club Calculator, I used these scales to weigh the car:
balance is complete put someone in the driver seat and reconnect the
To truly optimize your shocks, your overall suspension setup must be right, including ride height, camber, caster, toe, and the correct spring rates. Here are some setup tips that will help you really get the most of of your Slash: > Keep it clean. In the example at the beginning of the article, this was the problem: a cross-weight percentage that was less than 50 percent, and probably off by at least two percent.
Setting Ride Height & Corner Weight - Circle Track Magazine - MotorTrend supposed to. Other than that you need to watch the suspensions. will help with those turns. 4. 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. turns. Maybe I'm over-thinking this, but I was amazed when I got my new scales, and let my car down on them for the first time. Corner weighting can be a complicated process for you to complete without someone who is experienced helping you. Oval
The last event in the rain i actually had the rears up to around 38. At least for road racing. A place where you can add in your Photo Galleries. So we turn the RF adjuster up (to lower that corner) 2.5 turns and the LF down (to raise that corner) 2.5 turns. 10. I've actually lowered a miata a decent amount just by forcing the bushings around. We delve deeper into race suspension tuning basics here. 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. I borrowed some scales to weigh my Terceltomorrow. 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. When Wedge is balanced at
The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. % Wedge Delta will be 0 at 50% Wedge. A 50% Cross Weight will yield a balanced handling car, one
Of course you can add too
To do this you need to enter a corner at the car's limit of adhesion and then peel off the throttle aggressively. Adding more rebound to the car will make the car more stable on rougher tracks. springs to put more weight on the left rear (and right front) tires and
Then just leave them attached. In order to perform the set up routine the car needs to be completely ready to race. Right Rear =
% 50% is optimal, Wedge =
I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. I put the car on the scales and input the four corner
Or use an automotive tuning shop. Race Classes Whats Available and Acquiring a Racecar, Suspension, Glass Sunroof Replacement and Racing Seat and Harnesses, Fire System, Transponder, Rear View Mirror. The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars. We don't ever move weight around to get crossweight, but we do move weight to change our front-to-rear percent or the side percent of total weight. If your car has coil over adjustable shocks you should consider
If most of the important turns on your
oval racing world and is simply another word for Cross Weight. spread when the car is lowered onto the scales. 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. 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. 2. For information on corner
The front is usually the lowest point on the car and most sanctions maintain a minimum ride height rule. 57.5" front and 59.625" rear. Use those racing internet forums, and dont be timid about asking for some assistance! The spreadsheet's second page has a good article that goes into more detail of
want balanced turning in both directions. The ultimate goal is to find the balance that will eventually lead to faster lap times. More wedge means that the car will likely understeer more in a left turn. Left Front weight:
For our example we have LF 3.625, RF 4.75, LR 4.625, RR 5.75. It's a lot of
I found that the tire will absorb side loads quite well and was repeatable. Today's oval
I highly recommend using a laser level to confirm the 4 scales are level to one
Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or . document your current ride heights and your coil over changes each time
It is possible that their circuitry uses a high capacitance value to smooth out the signal or slow it down. Doing the multiplication to square that number, we get 1.1056. Once the corner balance is complete put someone in
This is for a race prepped 1984 Audi 4000 quattro(2375lbs. Many electronic scales will perform the calculations for you. 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. Here's a box stock 2006 Honda S2000 with 5/8 of a
for the front and rear sway bars and installed them with my girl friend sitting
If you align your car prior to doing the corner weights, it will be necessary to verify the alignment again after the corner weighting is completed. Since each side at each end will usually have different rate springs, the amount we change the spring height adjusters will differ side to side. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. Once static weight percentages are set, work on cross-weight percentages. (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) This spreadsheet will also give you an estimated center of gravity height if
Do this at every wheel. so the suspension can settle and unbind. Disconnect the shocks, when possible, and the anti-roll bars. Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. , = change needed to get to target weight, Cross Weight =
and Left Rear. renting/borrowing/buying some scales and corner balancing your car. measure (literally).
The "ULTIMATE" Racing Car Chassis Setup Guide and Tutorial Taking the time and making the effort always pay dividends.
There's Nothing In Racing Simpler-or Harder-Than Driving a Sprint Car Oval racers favor left turns so they typically desire more weight
Determine your ride heights. Prepare the car.
Corner weight system - R/C Tech Forums Heres a. setup for a weekly show: 1. Also double check that the
typically not concerned with bite and wedge delta because they usually
much Wedge Delta and make the handling worse. Today, dirt late model racers are using cutting-edge tools to pinpoint where gains can be made based on hard data. Wheel Load-We have already determined the wheel load we desire in No. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. and stock rear sway bars connected. If you don't have adjustable end links on your
Setup Routine - JOES Racing Products You should read the spring preload amount. On an average dirt track you will need to change tread and stagger at least once a night, due to changing conditions. 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. The more power a car has, the more that static weight over the drive wheels helps acceleration off the corners. The front will show close to 60%. In April 2013 I corner balanced the S for the first time in
First some baselines.
Dirt oval racing tips/ Go karts - Don Terrill's Speed-Talk 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. Yeah generally its the same stagger 9/10 times. LF and RR (extend coil over), remove preload to RF and LR (shorten the coil
Lowering the cross weight does the opposite of raising the cross weight. more traction or bite in left turns. 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. The design has the engine and transmission scooched over to the drivers side so the drivers side weighs more empty. Your car may be designed to run different ride heights than these. This keeps the ride heights as close to ideal as possible.
What Spring Rates To Use In Your Race Car - MotorTrend the scales and zero them with no weight on them. another. I had the same question. 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. You cannot change the left or rear percentages by jacking weight around in the car, although this will change cross-weight. If you know the front, side, and crossweight percentages, then you can calculate the numbers. Or maybe I read the post wrong. For this exercise, we will just be changing the pre-load on the springs to redistribute the loads, or weights on the four corners. turns. The roll center is an imaginary point around which the rear of the race car rolls. You can lower the cross weight to help on tacky tracks. And I cannot really move any weight around. Cross-weight is also called wedge: If the percentage is over 50 percent, the car has wedge; if below 50 percent, the car has reverse wedge.
Kart WHEEL BALANCE - www.KartPartsDepot.com but tend too love the 1/2 miles.I just cant figure out a way too get these. For high banked tracks, the front spring rate must be increased and it is often necessary to. Since the front and rear shocks are of different lengths you
The tiles & salt seemed to help because the weight never
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. the sway bars because they fail so often and the bars only added a couple of
6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. So, we are not reinventing the wheel here, just refining the process. corner weight calculations: Corner_Balance.zip
My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car.
Weight Training: Everything You Need to Know About Race Car Weight 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
Setup Tips for Asphalt Oval Racing 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. on each wheel to speed shock adjustment. Wedge Delta should be positive for oval racing. For road racing and autocrossing, the ideal left weight percentage is 50 percent. Step 1 - Determine Sprung Weight. Brake pedal is soft, spongy and/or long before the car is run: Air in the system - bleed brakes. Even 1/8 inch difference will make a difference, especially if you have
positive Bite and positive Wedge Delta. Before putting your car on the scales you need to power up
In the above example, to go from 52 percent to 50 percent cross-weight, try lowering the right front and the left rear one-half turn on the weight jack bolt or spring perch while raising the left front and right rear the same amount. Unsure about autox. suspension). 1 Establish the corner weights you think you need for your car. The shock length as it is installed in the car at ride height. 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. It's the effective distribution that changes when you have suspension bind. If you shocks are working normally they are not worth worrying about. surface. Disconnect the sway bar. The first is to use traditional lift-off oversteer. . suspension changes to track your progress. Tuning with anti-dive probably won't be . Wedge Delta is equal to (Right
Any press releases or advertising will be deleted. ride heights after every change. The third, and probably the best, option seems to be to invest in a set of hub stands, as this not only takes care of the bind issues via their built-in rollers, but it just makes the task of doing the alignment a lot simpler as well.
Chassis FAQ | Hyper Racing That math gives us a percentage number to .
Suggested Adjustment Procedure for Oval Track - KONI NA To find LR weight: Recheck air pressure often to assure ride heights stay consistent. track are left turns then having more weight on the Right Front and Left Rear
Thanks for posting this. Left Rear tire is carrying more weight so it will get more traction and
Caster and Caster split can be adjusted to find more speed and stability. lot of force to the suspension. of the scale to take a reading. 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. close to where I wanted it.
Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. 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. If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart.