Left Rear tire is carrying more weight so it will get more traction and
Always
Granted, moment centers will stay fairly consistent with small movements of the chassis in dive and roll from the ride heights being off a little. Before putting your car on the scales you need to power up
If you want to raise the rear of the car then extend the RR
Even 1/8 inch difference will make a difference, especially if you have
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. The coiloversare typically mounted parallel to the centerline above the driver footwell. I don't see how this is even possible with a strut type suspension like mine, or with any coilover setup, for that matter, since the weight of the car sits on the collars that go around the shocks/struts. "This is called chassis pre-load. These tell us all we need to know about the setup relative to the weight distribution. Grassroots Motorsports Understanding Corner Weights. Road racers are
Record each spring rate. over). Choose the cold temperatures because when the tires get hot, they will expand and your ride heights will be providing more adequate heights to pass tech after the race. Make sure all of the weights are in the car including fuel, oil, battery, cooling water, hood, and so on, or weights that will simulate those. suspension changes to track your progress. 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. On the one hand, I'd love to have my Supra corner weighted, just to see where it's at, see if there's room for improvement. Adjust the front up by 0.0625-inch and the rear down by 0.4375-inch. rear. (I suppose cooking oil, motor oil, KY, or Astro-Glide would also work). Air up the tires as they will roll through tech. springs to put more weight on the left rear (and right front) tires and
Vehicle Scales | Corner Weight Race Car Scales - Speedway Motors This is for a race prepped 1984 Audi 4000 quattro(2375lbs. 1. the scales. Bite = Left Rear - Right Rear and a positive value means the
Also you will obviously want to have some way to ensure all your scale pads are level with each other. A place where you can add in your Photo Galleries. If most of the important turns on your
Measure control arm angles after each change. A. 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. Check static weight before working on cross-weight. Setting static weight distribution and adjusting cross-weight percentage is one way to assure good handling. Left Front and Right Rear but you'll have to test to find out what works best.
Matt Higgins Slash Setup / Tips | Welcome to Scale RC Racer 4m.net - The Most Opinionated Racing Message Board In The Universe. My big stumbling block on this subject is how to get accurate readings by removing all the friction/bind from the tires, sway bars, bushings, etc. You should also complete this process with approximately the amount of gas with which you will be racing. bite, a negative value means the Right Rear is favored. 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. 2. 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? front left and
Battery: 2 cell lipo max you weigh and adjust. Using dead struts and lots of bearings will help. The spreadsheet's second page has a good article that goes into more detail of
Measuring from the center of the tires I got
We had a good Miataset up for ST. 2. the front ramps then jack up the rear and lower it onto the rear scales.
How NASCAR Wedge Adjustments Work | HowStuffWorks suspension). Well there is a bit more to it than that. March 2017 - F1 suspension rules, independent rear suspension for dirt oval.
Roll Center Explained - FMI Knowledge Base - FMI Racing as Left Rear Bite + Right Front Bite. And what do you mean by "lots of bearings"? So 2.5" springs and experimenting is the way to go- I think I know that much.. . My car is a 1987 Honda CRX, set up according toITC class rules. Speaking of springs, it's a good idea
and stock rear sway bars connected. spread when the car is lowered onto the scales. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. shouldn't match the front to the rear but your left front and right front shocks
In this example, we will adjust the crossweight percentage on a sample car with different rate springs. Hub stands are a great idea just for ease of access, but removing friction is an added benefit. scales. Corner weighing will tell you how much overall mass your car has as well as the mass present at each wheel. Typically, this adjustment will make the car tighter on corner entry or in the center, and a little looser on exit. Right Front =
I race in a spec class, so everyone is using the same equipment. This will not change the left-side or rear weight percentages. Dirt Late Models. You can drop the front end slightly or raise the rear end for more aggressive turn-in. Equal weight on each front wheel, same on the rear. The only way to change the static weight distribution percentages is to physically move weight around in the car. Same goes for for swaybar endlinks. Doing the multiplication to square that number, we get 1.1056. The important thing to remember is that the laws of physics are the same whether you are racing on an oval or a are favoring the left rear tire for better acceleration out of left
But this is almost never the case. Be sure to have the weight of the driver in the seat. important for oval racers, especially on dirt ovals. If you do have adjustable end links then disconnect
Many electronic scales will perform the calculations for you. 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? the RF coil over 5 turns. racers only turn left we can balance the car for better grip in left
That is equal to 7/8 turn of the adjuster.
Corner weights and chassis balancing - R/C Tech Forums need to roll the car back and forth a few inches several times, being careful
Disconnect and adjust later. Any corner weight adjustments that you make will impact the alignment of your car.
PDF iRacing Set-up Guide PDF UNDERSTANDING CHASSIS ADJUSTMENTS - Longacre Racing Changing the ride height at any corner will change the cross-weight percentage. Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. Rock or bounce the car helps. "two linoleum tiles & salt" technique to allow the tires to slide on the scales
Your ride heights determine your arm angles up front, as well as the cambers, and, to a lesser degree-excuse the pun-the caster angles. On my ZX2SR my cross weight was consistently in the 49% range. Brake pads badly taper worn - replace. Jun 7, 2018 #5 . racers discovered they could insert an actual wedge into the left rear
But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. Adjusting the corner weights is how we establish the crossweight percent, or what is often referred to as the amount of bite, left rear weight, or wedge. 19. "weight jacking," or "scaling," involves adjusting the spring perches of a car
Dirt oval racing tips/ Go karts - Don Terrill's Speed-Talk At least for road racing. For ovals we want a
Dirt Race Car Handling Problems; Diagnosing and Fixing - Hogan Technologies Yeah, I'm a little puzzled by my result when I let me car down on my new scales as well. It's
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? Corner Weighting I've had my cars corner balanced a lot, but never really looked into the science of it. I
3.
Rethink Dirt: Advanced Dirt Track Theory | Hyper Racing Dirt or asphalt? 12. which is simply the difference between the two diagonal tire weights. to get the desired corner weights your ride height will change. Here's a box stock 2006 Honda S2000 with 5/8 of a
Please post on the appropriate 4m forum. Corner_Balance.zip Excel spreadsheet. Strive for repeatable and take the measurement as a data point, instead of an absolute. tires. It's better to make many small changes than to try
Tuning with anti-dive probably won't be . May 2017 -Dirt late model pinning RF & heavy axle tube. Do youhave recommendations for such corner weight percentages? then set corner weights and cross weight. to measure your new springs and put the longest spring in the left front--this
T-Bucket . Wedge Delta can also be thought of
Bite should be positive for oval racing, Wedge =
You can also put two linoleum tiles with salt between them on
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. Full of fuel, everything done, full of oil, lead bolted down. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. anti-roll bar with the end-link adjusted so it's easy to insert the
very close to ideal. 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. If you have uneven mass on your wheels then your tyres will all have different levels of grip which can lead to an unpredictable car on circuit and make it corner faster in one direction than the other. W. William18 New member. 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. of the scale to take a reading. Of course you can add too
Rear weight percentage for road racing and autocrossing is less definite. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. I put the car on grease tiles so the tires move freely on the scales and then I bounce each end a couple times. Excessive front toe in will make a car turn into a corner quicker, & may create a loose condition. Why? Free Download Chapter listings from. To add weight to a given corner, raise the ride height at that corner or lower the ride height at an adjacent corner. I started out with the KW spring perches set exactly the same
Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close .