If you want to lower the ride height then retract both RF and
If one leg is longer or shorter than the others, the table will rock and thus be unstable. Oval Track. in the driver's seat to load the suspension. To keep things clear I call this added LR/RF weight Wedge
If you lower the ride height at a given corner, that corner will lose weight as will the diagonally opposite corner. Moving weight to the front of the kart will provide more front-end grip. With my KWV3 shocks I had to remove the wheel to adjust the
- can make your car dive like a dump truck or a block of wood on ice. Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. LF coil over 5 turns. The salt acts as tiny ball bearings and will allow the tires to
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? If most of the important turns on your
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! shouldn't match the front to the rear but your left front and right front shocks
Road racers can take a page out of the oval racing book and
Ask your chassis builder or establish what you want and decide that these will be what you run from now on. You can drop the front end slightly or raise the rear end for more aggressive turn-in. 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. pad capacity. extra weight is on the left rear and right front tires which gives them
I put the car on the scales and input the four corner
A jumbo ziploc bag prevents lube from escaping when not in use. 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). (CG) height by using this online calculator: CG Height
Always try to start with the track bars first. You can
Then move components like the battery or fuel cell. Oval
It would just automatically settle. Rock or bounce the car helps. That method keeps the ride heights close to the same. Do this at every wheel. Heres a. setup for a weekly show: 1. I'm anxious to see what Proform says about my experience. So let's study ride heights first. Caster and Caster split can be adjusted to find more speed and stability. 12. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . important for cars with upgraded (stiffer) sway bars because they can exert a
Air up the tires as they will roll through tech. the sway bars because they fail so often and the bars only added a couple of
Reduced stopping power with normal brake pedal: Pad fade - due either to unbedded new pads or to temperature beyond. Free Download Chapter listings from. (TVW LSP) - LF = 769D. These are your target weights which will yield a 50% Cross Weight: Left Front =
Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. Once you get the car up on the scales you'll
tiles) on the left front and 1 on the left rear to level the scales. I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. R. racing junky Member. May run 4 pole motors. When Wedge is balanced at
This is the arm length divided by the distance from the shock mount to the inner pivot line, squared. 5. T-Bucket . So, they don't care if the scales are level, they will get what they want from unlevel scales. I highly recommend using a laser level to confirm the 4 scales are level to one
So if you have 60% on the front , you should have 30% on each front wheel. want balanced turning in both directions. few inches several times on the scales before each reading though just for good
Then if it's for a particular road course, you will find several seconds optimizing for select turns and throwing any of the above methods out the window A friend's Chump Car found 2 sec at VIR making it turn right better than left. Check your tire pressure and bump it up to the hot pressure
If you want to lower the rear of the car then retract the LR
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. In almost all cases, the loss of cornering performance in one direction is greater than the gain in the other direction. All 4 scales must be within 1/8 of an inch. Unsure about autox. 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. renting/borrowing/buying some scales and corner balancing your car. 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. I've spent an hour this afternoon trying to do corner weights "on the cheap" using our IKEA kitchen scale (cost - 15.99 a few years ago) and three wooden blocks cut to the same height as the scale (38mm). 45. much Wedge Delta and make the handling worse. Once the corner balance is complete put someone in
The third thing I look for to make at the track dirt race car handling decisions is where the driver lifts the gas going into the corner, and the overall entry speed. In order to perform the set up routine the car needs to be completely ready to race. Your results might be different from mine. to measure your new springs and put the longest spring in the left front--this
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. 57.5" front and 59.625" rear. 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. that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. 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. The shock length as it is installed in the car at ride height. You need to follow distinct directions to set up your RC for a dirt oval. if you have any of the scales connected improperly (i.e. 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 dry)! CG Height Calculator, Cross Weight % =
turn to the RF simply to raise the ride height of the front of the car. center of gravity (CG) height by using this page:
The only way to change the static weight distribution percentages is to physically move weight around in the car. As with the table, the corresponding diagonal corner of the vehicle gets more of the car's weight. Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. Then just leave them attached. 2023 Motorsport Marketing. The front will show close to 60%. Step 1 - Determine Sprung Weight. values shown below are totally fictional. 6. Would be interesting to see how close to ideal I got it though, given how well it handles already. If you don't have adjustable end links on your anti-roll bars
With an oval track car turning to the left, weight will transfer from the inside to the outside. traction or bite in left turns. line above the scales and then stood on each scale and placed a ruler on the top
The cosine of 18 degrees is 0.95106, and that into 1.0 is 1.05146. There are several ways race teams adjust corner weight. important for oval racers, especially on dirt ovals. Today's oval
Took it to be corner weighted and it transformed the car in to a front runner that the drivers raved about. You can also put two linoleum tiles with salt between them on
Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . The crossweight percent will have changed to, say 55.4 percent. The first spreadsheet below is what I started with. what he means is he's adding weight to the left rear and right front
Once static weight percentages are set, work on cross-weight percentages. One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. Check static weight before working on cross-weight. All of these measurements are widened by the
But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. Excessive front toe in will make a car turn into a corner quicker, & may create a loose condition. Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. racers add "wedge" by adjusting the right rear spring perch--they
Before putting your car on the scales you need to power up
Well there is a bit more to it than that. The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. The total spring perch
I borrowed some scales to weigh my Terceltomorrow. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. Determine your ride heights. 5.00 front 8.00 back aren't too big unless you can get by with smaller and not lose traction. LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. are favoring the left rear tire for better acceleration out of left
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. My track width with CE28 17" x 9" wheels
You can also use this online calculator to compute your corner
Motor: 550 or 540 motors only. 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. racers discovered they could insert an actual wedge into the left rear
So, deviating from those numbers will mean you have a design other than what was intended for the car. are favoring the left rear tire for better acceleration out of left
Muscle Car. Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. 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. Conversely, if the car feels tight throughout the corner, raise both track bars. Oval racers favor left turns so they typically desire more weight on the right front and left rear tires. Full of fuel, everything done, full of oil, lead bolted down. positive Bite and positive Wedge Delta. When I weigh my cars I try not too overthink all this binding stuff. Take the cosine of that angle, divide it into 1.0 and then square it, or multiply it by itself. Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced. per wheel. Calculator, I used these scales to weigh the car:
And I cannot really move any weight around. 4 Establish the exact weight change in percent that a given spring height change will make and record that number. box in the "Ride Height" section of each spreadsheet. Measure control arm angles after each change. Ideal weight percentages: Front - 43-45% Left - 53-56% Cross - 52-54% What do these numbers mean? It has to, it's just the laws of physics. Always record the cross-weights and ride heights for reference at the race track in case changes are needed. I use 2x6 wood planks as ramps to drive the car onto
your scales. Afterward you need to adjust the settings to the correct maneuvers. adjustments were 1 turn to the right front and 3/4 turn to the left rear. Of course you can add too
(Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. Understanding corner weights. Corner Weight: (1/2 the front or rear weight) Use an accurate racecar scale that will weigh each corner of your car. decided to try 5 turns total of spring perch movement to balance the car. 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. 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. It's better to make many small changes than to try
Open timing on motor and esc. If we are talking of weighing a stock type vehicle, not a lot can be done since there are no adjustable parts. rear. to get the desired corner weights your ride height will change. My car is a 1987 Honda CRX, set up according toITC class rules. about 1/8" of wheel movement) to reduce the weight on the right front and left
This spreadsheet will also give you an estimated center of gravity height if
And what do you mean by "lots of bearings"? I'm off by 0.1% (see numbers on left side of the spreadsheet). We run a fixed chassis meaning no suspension and the Briggs lo206 so we aren't sliding it around the corner but tracking almost like an asphalt Kart. I can see binding throwing off each corners weight but the sum should be the same. A. An analogy which is commonly used is to imagine that the car is a four-legged table. That math gives us a percentage number to . Here's how we find the multipliers. Yep, old struts that are drained of fluid and have little to no resistance. If you get the car neutral in left turns, it oversteers in right turns. LR coil overs 2 1/2 turns. The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire then leave them connected. I don't like the lower weight ratings and plastic scale pads of proform. bite, a negative value means the Right Rear is favored. Scale Type: . ride heights after every change. Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. Now that we have the front-to-rear rake set, we adjust the side-to-side rake. and stock rear sway bars connected. < Enter your corner weights in pounds or kilos and click 'Calculate'. Guess I have to try it. I would imagine that disconnecting the shocks is only applicable to setups where the shock and spring are separate, like a lot of solid axle cars, or Mk2 Supras in my experience. of the scale to take a reading. Record each spring rate. you run on the track. Just make sure none of them are flat or wildly overinflated. How would you makesomething like that? 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. track are left turns then having more weight on the Right Front and Left Rear
12. On my ZX2SR my cross weight was consistently in the 49% range. Other than that you need to watch the suspensions. The roll center is an imaginary point around which the rear of the race car rolls. Choose a level spot in your setup area. You will never find a perfectly level spot at the track, so don't waste time looking, unless you can set up your scale pads and set up ramps level. anti-roll bars then leave them connected. typically not concerned with bite and wedge delta because they usually
I recommend you start with your car at your desired ride
I
them for the corner balance. Oval
each and retract the RF (Right Front) and LR 1 1/4 turns each. As the shopping cart is pushed forward the front wheels spin back and trail behind the caster line. I dropped my integra off at edge to have this done today. works well. Be sure to have the weight of the driver in the seat. Delta which is simply the difference between the two diagonal tire weights. 50% then Wedge Delta will be 0. For a car with a 17.5-inch lower control arm length and a ball joint-to-spring mount distance of 2.5 inches, you divide 17.5 by 15 (17.5-2.5) to get 1.1667 and then multiply that by itself to get 1.3611. I made a 4-scale system for my off-road cars. These weights are in ready to race form (including driver on board). Check your tire pressure and bump it up to the hot pressure
This is for a race prepped 1984 Audi 4000 quattro(2375lbs. Right handers vs left handers feel quite a bit different-I run out of suspension on right handers much more often, and on left handers the car loves having me hanging out over the inside of the contact patches working the corner. Hub stands are a great idea just for ease of access, but removing friction is an added benefit. 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. McMaster-Carr adjustable end links
Left Front and Right Rear but you'll have to test to find out what works best. It varies with weight removal, added. does not change when a driver is added. 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? Right Front tires. How big is the track? 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. It's critical that you set ride height in the same place each and every time you do it. 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. Intercomp SW500 EZ Weigh Scales. LF and RR (extend coil over), remove preload to RF and LR (shorten the coil
All of these factors play a huge part in what each corner of the car will weigh. Are they adjustable?
another. My car has solid/spherical bushings everywhere, so there should be very little bind from them. the driver seat and reconnect them so there's no preload on them. 2. I stretched my tires to get the RR right and now I'm . so the suspension can settle and unbind. A perfectly corner balanced car will handle the same when turning left and right, and will maximize the tire contact area on all four corners. Toe inn a 1/4 inch. I usually mark an even inch and write that inch number on the tape. you don't use Microsoft Excel. left to right. intentionally favor a turn direction. 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. For pure race cars this isnt a consideration. of its weight on the Left Front and Right Rear tires, and 50% on the Right Front
The car literally registered several hundred pounds less that what the weight finally settled at after I jumped up and down on the door sills for several minutes. I
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.