Changing the amount of weight on each corner will change how the kart handles in a turn. very close to ideal. Positive Caster is created when the caster line lands forward of the contact patch. 8 Read the ride heights as they exist. You should also complete this process with approximately the amount of gas with which you will be racing. per wheel. Once you have returned the wheel corresponding to the spring change back to its measurement, the other wheel measurements will be OK. 3. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. the front ramps then jack up the rear and lower it onto the rear scales. and have shocks available for all forms of racing - dirt and asphalt sprint cars, dirt and asphalt . Doing the multiplication to square that number, we get 1.1056. shifted by more than 1 pound after rolling the car on the scales. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. Once the corner
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. You will need to weight your vehicle on each tire to use this tool. There are many ways to corner balance a car. 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
. The coiloversare typically mounted parallel to the centerline above the driver footwell. the scales and zero them with no weight on them. coil over 5 turns. This approach is commonly used in oval track racing. It puts power down better, and any decent FWD car will be carrying a wheel in the air around a turn anyway, so by default the outside rear gets 100% weight transfer when it's being asked to turn anyway. Upgrade fluid and/or cool. Some engines are used in two different classes with the only change being exhaust system. turns. I see disconnecting the sway bar, and how to do it, but disconnect the shocks? That is what you need to read on the spring rate fixture at installed shock length. Classic Truck. Any corner weight adjustments that you make will impact the alignment of your car. springs to put more weight on the left rear (and right front) tires and
We will deal with preload on the bar later on. that turns equally well in both directions. 2023 Motorsport Marketing. If you want to raise the front of the car then extend only the
not to push it off the scales, to unbind the suspension (as the car is
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. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. If you do have adjustable end links then disconnect
used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales
Cross weight and left side work backwards in terms of adjustment. 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. A common example of caster is a shopping cart. The advantage to wedge is that the left rear tire carries more load, so the car drives off the turns better. A jumbo ziploc bag prevents lube from escaping when not in use. 11. 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. I overshot by a little so I raised the left rear spring perch by 1/2
Do not adjust any other wheel's spacing. tires. As with the table, the corresponding diagonal corner of the vehicle gets more of the car's weight. To keep things clear I call this added weight Wedge Delta
camber angle of the wheels (-3.5 front, -3 rear). 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. (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4
cross weight. Prepare the car. Do this at every wheel. 3. shouldn't match the front to the rear but your left front and right front shocks
We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. Iretighten them after I've made all my adjustments. Moving weight to the front of the kart will provide more front-end grip. Road racers are
Determine your ride heights. If the car feels loose throughout the corner, lower both track bars evenly. 2. the RF coil over 5 turns. difficult to position all 4 scales so you can just drive up on all of them at
Maybe there's some sort of bind in the scales. TVW - (RF + LF + LR) = 603. then set corner weights and cross weight. Step 1: Setup And Tuning The Tires Most regular RC cars use rubber tires. Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. 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. This makes the cornering force balanced from left to right and offers the best performance overall. cars through the corners and thats where there eating me up. 50% then Wedge Delta will be 0. This is my 2001 S2000 with 1/2 tank gas, 216
This spreadsheet will also give you an estimated center of gravity height if
Scale Type: . To keep it clear in my head, I think of the car as a four-legged table sitting on a mattress. Andy Hollis does this. 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. Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. If you lower the ride height at a given corner, that corner will lose weight as will the diagonally opposite corner. Keep in mind the stiffer your springs the
Many electronic scales will perform the calculations for you. February 2017 -Suspension design process. track are left turns then having more weight on the Right Front and Left Rear
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. "weight jacking," or "scaling," involves adjusting the spring perches of a car
That makes every little detail that much more important. important for oval racers, especially on dirt ovals. Taking the time and making the effort always pay dividends. the scales. Corner balancing, sometimes referred to as "corner weighting,"
- can make your car dive like a dump truck or a block of wood on ice. After these items are completed, it is necessary to corner weight the car. Guess I have to try it. The other two corners will lose weight. 4. Then move components like the battery or fuel cell. another.
you run on the track. At least for road racing. Front + Left Rear) - (Left Front + Right Rear) and tells us how much
To do this, we add five rounds of pre-load to the RF. lot of force to the suspension.
Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. Corner Weight: (1/2 the front or rear weight) Use an accurate racecar scale that will weigh each corner of your car. Always try to start with the track bars first. 2. Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. Make small changes at the track, and make only one change at a time. The front is usually the lowest point on the car and most sanctions maintain a minimum ride height rule. pad capacity. 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. 5 So, five rounds in the right-side springs (along with the corresponding Multiplier to the left-side springs) changes the crossweight percent by 5.6 percent, which is 1.12 percent per round, or 0.89 rounds per percent of crossweight. 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? 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. When you lower the panhard bar the rear roll center drops. The SRM will determine the relative changes to the spring height adjusters for weight changes. However, for dirt oval RC cars, foam tires are the norm. difference that made. Right Front tires. Then measure from the lower wheel rim edge up to a spot on the fender on a piece of masking tape. can help us get our setup right with less testing. 4m.net - The Most Opinionated Racing Message Board In The Universe. 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. after this adjustment we still need to add 39lbs to the Left Front and
My track width with CE28 17" x 9" wheels
balance is complete put someone in the driver seat and reconnect the
So, we are not reinventing the wheel here, just refining the process. If you don't have adjustable end links on your
Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. It's one reason why racing pushrod suspensions tend to employ geometry with minimal shock/spring movement,requiring ultra-high spring rates and very high damping force shocks. Measure control arm angles after each change. retract the right rear tire which puts more weight on the Left Rear and
I've read all the info before, in various places, but it's good to have a refresher. more traction or bite in left turns. When Wedge is balanced at
g) Oval track and road racers use slightly different vocabularies to describe the adjustments made to their cars and the effects these adjustments have on the car's handling. It still pays to be thoughtful about weight placement fore and aft in your car. Choose a level spot in your setup area. 12. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . Bite tells us how much we
We now take five rounds out of the RR and add five rounds times the rear multiplier, or 2.0 5 = 10 rounds to the LR. All 4 scales must be within 1/8 of an inch. I recommend you start with your car at your desired ride
These tell us all we need to know about the setup relative to the weight distribution. The spreadsheet's second page has a good article that goes into more detail of
For pure race cars this isnt a consideration. For our example, we need to go from 49.8 to 54 percent. . Then just leave them attached. surface. And I cannot really move any weight around. Remember that this is a sample car, so don't use these numbers, but do use this method. Right Rear. Brake pedal is soft, spongy and/or long before the car is run: Air in the system - bleed brakes. Disconnect the shocks, when possible, and the anti-roll bars. 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. Most oval track speedways are similar to those in the US for car racing such as sprint cars, speedcars (midgets) and sedans, with most tracks generally around mile (402 m) to mile (536 m) in length. of the scale to take a reading. Now that's pretty cool! (CG) height by using this online calculator: CG Height
much Wedge Delta and make the handling worse. 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. see on the right side of the spreadsheet's "Target Corner Weights" section that
need to roll the car back and forth a few inches several times, being careful
you don't use Microsoft Excel. are favoring the left rear tire for better acceleration out of left
The tiles I
On an average workbench/table that's close to level, it's probably < 3g difference per corner, which is within the tolerance of stiction / binding in a touring car. One of the most important aspects of racing is having a good handling balance. But in a right turn, the opposite occurs and the handling is worse. Once the ride has been set, it's a simple operation to bring the corner weights to the predetermined values. Tuning with anti-dive probably won't be . If you want to lower the rear of the car then retract the LR
We do this by jacking weight into, or adding preload to, the RF spring and the LR spring.
In our example, the front average is 4.25 and the rear is 4.75. If you get the car neutral in left turns, it oversteers in right turns. used are 0.045" thick. This approach is commonly used in oval track racing. measure (literally). If most of the important turns on your
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 . More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire They are not too suitable for racing and oval dirt cars. In our example, move the LR and RR corners down by 0.4375-inch. and Left Rear. The shock length as it is installed in the car at ride height. Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. supposed to. The process is so basic to the setup of the car. Do this by making equal changes to the adjusters on each side. Unsure about autox. Oval
To carry the wheel load, the spring must be compressed quite a bit. Since this article still gets a bunch of traffic, just bumping it up. racers add "wedge" by adjusting the right rear spring perch--they
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. will help with those turns. Only after I spent a lot of time bouncing on the door sills did it settle down and stabilize. The more power a car has, the more that static weight over the drive wheels helps acceleration off the corners. 1. Corner Weighting 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. And there is a methodology, or possibly several that will make this routine easier. 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. I
That's all total speculation though. bite, a negative value means the Right Rear is favored. A. You can also put two linoleum tiles with salt between them on
Air up the tires as they will roll through tech. There are legal issues too at the front. how and why to corner balance a car. Rock or bounce the car helps. I still rolled the car back and forth a
This will pitch the vehicle's. 1 of the section on "Adjusting The Corner Weights," and that is 685. want balanced turning in both directions. You would be amazed at how much bushing twist can contribute on your suspension. I dropped my integra off at edge to have this done today. These are your current calculated weights: Left Weight =
You can see the article here:
springs settled over the first 3 months. It is best to make small changes at each corner, instead of a big change at one corner. Intercomp SW500 EZ Weigh Scales. Wedge is a term used in the
does not change when a driver is added. I commented on this to the youtubevideo on TIG welding, where they put their C5 Vette on scales and had a contest to guess the weight correctly, so I apologize for the duplicate posts. [ 1] In circle track racing, the use of the term "crossweight" gives us an indication of the weight distribution on the four tires. Finding The BBSS Front Spring Pre-Loading Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. Wedge Delta is equal to (Right
"There's a lot of freedom when it comes to setups using various styles of springs" in dirt late model racing, said a source. unbalanced--it will turn better in one direction than in the other (all other
You can use rubber tires on very specific tracks and seasons. 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. Delta is equal to (Right
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. 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. Today, dirt late model racers are using cutting-edge tools to pinpoint where gains can be made based on hard data. This was a very interesting post to me. I
. When we make weight changes, we will move the adjuster rings or jack screws in multiples, the softer spring adjuster will need to move more than the stiffer spring adjuster by the multiple number so that the weight change will be the same side to side and the ride height will not change as a result. To keep things clear I call this added LR/RF weight Wedge
More wedge means that the car will likely understeer more in a left turn. You need a nice, flat and level surface for the scales. Full of fuel, everything done, full of oil, lead bolted down. and measured between the outside bottom rim edge is 67.75" front and 69.875"
Any press releases or advertising will be deleted. tiles) on the left front and 1 on the left rear to level the scales. The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. Calculate the average front and rear desired ride heights. I gave up on running adjustable end links on
On an average dirt track you will need to change tread and stagger at least once a night, due to changing conditions. We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. in the driver's seat to load the suspension. the same time. Step 1 - Determine Sprung Weight. I stretched my tires to get the RR right and now I'm . Here is what you do. 12. 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. 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. However, most importantly you need to take care of the handling. weights into the spreadsheet (the blue numbers in the left "Corner Weights"
I needed 3 linoleum tiles (0.045" thick
Using dead struts and lots of bearings will help. (TVW FWP) - RF = 743C. Recheck air pressure often to assure ride heights stay consistent. 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. Equal weight on each front wheel, same on the rear. racers only turn left we can balance the car for better grip in left
by about 1/4 inch so most of my adjustments were positive--they raised the car. A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. oval racing world and is simply another word for Cross Weight. Or am I missing something? bite, a negative value means the Right Rear is favored. For ovals we want a
Check your tire pressure and bump it up to the hot pressure
Still, it is a worthwhile goal to strive for 50 percent left-side weight. You could also raise the left front or right rear ride heights to do the same thing. Free Download Chapter listings from. be appropriate such as making small adjustments to all 4 wheels--add preload to
Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. Adjust the rear down by using the same method as in No. Shock Angle-measure the angle of the shock installed and at ride height.
Ok sounds good. The total spring perch
The crossweight percent will have changed to, say 55.4 percent. It also helps when shaking the car to take the bind out of the linkages. Motion Ratio of the lower control arm. And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm. The height of the rear roll center (and the front also) is critical to handling. This is for a race prepped 1984 Audi 4000 quattro(2375lbs. Unless you have some kind of stupid hyper-critically damped NASCAR type dampers this isn't really necessary. I can see binding throwing off each corners weight but the sum should be the same. Once you get the car up on the scales you'll
In circle track racing, we often, and almost always, have different rate springs on each corner of the car. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. Oval
Can do to just left sidesor right sides, or to all 4. much Wedge Delta and make the handling worse. My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car. 13. 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. 2 1/2 turns. At the time Honda was still favoring their home market I reckon. 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. Of course you can add too
Typically, a road racing car should have 50%
Disconnect and adjust later. This obviously means that decreasing cross weight or left side weight important for oval racers, especially on dirt ovals. Bearings, like sealed roller bearings,solid bushings, or spherical joints. Right Front weight: Left Rear weight:
RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval, GFRP, Custom Works, Purpose Built) - YouTube 0:00 / 43:10 Dirt Oval Setup & Tuning Tutorials RC Dirt Oval Basic Setup &. you weigh and adjust. Always
McMaster-Carr adjustable end links
If you go to a tuning shop that provides this service, estimate that it will cost you $90 $150 to have them corner weight the car for you. I use this technique and it
Remember that changes in stagger, tire pressures and springs will change the ride height and alter the cross-weight percentage. I'm anxious to see what Proform says about my experience. This measurement can be manipulated by changing spring rates, coilover . R. racing junky Member. The last event in the rain i actually had the rears up to around 38. 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). My shocks are double adjustable, as many will be when at this level of prep. links then disconnect them for the corner balance. Before putting your car on the scales you need to power up
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