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
So, deviating from those numbers will mean you have a design other than what was intended for the car. then leave them connected. Less fuel equals faster speeds. Right Front tires. 50% then Wedge Delta will be 0. If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. Changing the ride height at any corner will change the cross-weight percentage. Since this article still gets a bunch of traffic, just bumping it up. This spreadsheet will also give you an estimated center of gravity height if
The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire 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. over
A good starting point would be tank of gas. can help us get our setup right with less testing. Let's explore some ways to do this in an orderly and sensible way. after this adjustment we still need to add 39lbs to the Left Front and
11. Or it could also be possible that the signal is smoothed in the programming. You can also put two linoleum tiles with salt between them on
You need a nice, flat and level surface for the scales. 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. Your results might be different from mine. The first spreadsheet below is what I started with. upgrading our street stock suspension part 2 the rear end. Auto-Ware (Autoware Inc) auto racing reference library 4m.net - The Most Opinionated Racing Message Board In The Universe Delta which is simply the difference between the two diagonal tire weights. Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. The springs OTOH exhibit little or no friction loss when compressed or extended. Wedge Delta can also be thought of
The first is to use traditional lift-off oversteer. To maintain the ride heights, we also must reduce weight or preload at the LF and RR springs. 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. The other two corners will gain weight. I needed 3 tiles on the left front and 1 on the left rear
Open timing on motor and esc. 1 Establish the corner weights you think you need for your car. "Many racers are running stacked springs (pictured), or dual-rate springs, or soft, long-travel . How to Adjust iRacing Sprint Car Cross Weight AKA Wedge 3. it would help the car turn left and accelerate better. 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 Adjust the front up by 0.0625-inch and the rear down by 0.4375-inch. It was a good car. I used a laser level to project a horizontal
More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . Jacking weight will not alter the left side or the rear percentages. Mudboss Setup #3 - Traxxas Slash transmission setup and diff - YouTube What is Wedge in Dirt Racing? How Can it be Fixed? - Southern Reaceway Fans I recommend you start with your car at your desired ride
Calculate the average existing ride heights front and rear. stiff springs on your coil overs. Leebo's Corner. This can make maneuvering in traffic difficult, even dangerous. This will not change the left-side or rear weight percentages. Understanding How Weight Distribution Affects Your Race Car Put the car on ride height blocks without the shocks in the car and then measure the shock length from center of bolt to center of bolt. No, not as in the law, but in being legal in tech. You can also use this technique when adjusting your alignment and
You need to follow distinct directions to set up your RC for a dirt oval. Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . 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. 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. you run on the track. I still rolled the car back and forth a
You need: 1. And don't ever believe the track scales. Proforms are cheap scales. Just to confirm the theory I checked the corner weights with
Currently, dirt car racing involves a left-hand weight measurement of 53.5-55, along with a wedge between 75-125 pounds. So LF/LR = RF/RR is what you shoot for.
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. front left and
the RF coil over 5 turns. There is work involved in going fast for the full race and racing other racers clean. Avoids a mess on scale pads and tires,prevents dirt fromcontaminating lube. Today's oval
It's a lot of
things being equal). 8 Read the ride heights as they exist. on my garage floor for future reference. In April 2013 I corner balanced the S for the first time in
Corner weights and chassis balancing - R/C Tech Forums This obviously means that decreasing cross weight or left side weight You can also use this online calculator to compute your corner
They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. I needed 3 linoleum tiles (0.045" thick
50% then Wedge Delta will be 0. Oval
That seem like a lot. A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. Setup Routine - JOES Racing Products 10. The last event in the rain i actually had the rears up to around 38. I usually mark an even inch and write that inch number on the tape. When you adjust your coil overs
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. Once you get the car up on the scales you'll
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. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. car for a week to let the suspension settle: I decided to disconnect the front and rear sway bars to see what
You can
On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. The "ULTIMATE" Racing Car Chassis Setup Guide and Tutorial Steve Smith Autosports - Tech Tips PDF UNDERSTANDING CHASSIS ADJUSTMENTS - Longacre Racing I put the car on the scales and input the four corner
To find LR weight: positive Bite and positive Wedge Delta. You've mentioned "dead struts" a couple of times - what do you mean by that? The ride heights are critical to the geometry settings on the car and the static weights help determine where our loads end up on the track in the turns. Tell the shop you will be disconnecting the rear sway bar when obtaining the estimate. Handling Guide - RACING ON THE CHEAP Toe inn a 1/4 inch. will help with those turns. 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. If you moved only one point, then the problems begin. LR = left rear. Small angles can throw off your readings significantly. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. 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. I used a laser level to project a horizontal
LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. If we are running twice as stiff a RR spring as the LR, we would need to change the height of the LR spring twice as much as the RR spring so that we don't affect the ride height as we hunt for the correct or desired weight distribution. 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. Make sure the tires are centered on the scales. Check static weight before working on cross-weight. With my KWV3 shocks I had to remove the wheel to adjust the
The front will show close to 60%. A place where you can add in your Photo Galleries. Record these. 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. Commodore's Garage #19 - Crossweight - iRacing.com 2. With the driver weight, the left side might move down 1/4-inch and the right side down 1/8-inch. 5. The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. much Wedge Delta and make the handling worse. The following weights are with the front Comptech adjustable
To calculate cross-weight percentage, add the RF weight to the LR weight and divide the sum by the total weight of the car. 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. They are not too suitable for racing and oval dirt cars. lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille
In our example it is 18 degrees. That is equal to 7/8 turn of the adjuster. Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. Setting Up Your Traxxas Slash | Traxxas Thanks. rear. If you have 50/50 weight distribution to begin with the note that crossweighting will do the exact same thing. 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? %Right Weight =
anti-roll bars then leave them connected. 7. I see disconnecting the sway bar, and how to do it, but disconnect the shocks? very close to ideal. 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. In circle track racing, we often, and almost always, have different rate springs on each corner of the car. another. The only way to change the static weight distribution percentages is to physically move weight around in the car. 1. If you get the car neutral in left turns, it oversteers in right turns. However, for dirt oval RC cars, foam tires are the norm. Firstly, you need to balance out your RC. %, Bite =
important for oval racers, especially on dirt ovals. Motion Ratio of the lower control arm. The cosine of 18 degrees is 0.95106, and that into 1.0 is 1.05146. Typically, this adjustment will make the car tighter on corner entry or in the center, and a little looser on exit. 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. end-link into the anti-roll bar's hole. Weight Training: Everything You Need to Know About Race Car Weight You're better off not corner balancing the car than doing it on an unlevel
However, you can choose to use them. 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. 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. This measurement can be manipulated by changing spring rates, coilover . This approach is commonly used in oval track racing. Note the "Conditions and Changes Made"
Just make sure none of them are flat or wildly overinflated. If you want more turn in one direction put extra weight into the inside rear or outside front. 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.
Bite = Left Rear - Right Rear and a positive value means the
Lowering the cross weight does the opposite of raising the cross weight. Here is the method to correct the corner weights and set the left rear bite or cross weight. 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. of the scale to take a reading. It is best to get 50 percent left-side weight when possible. I have now added the ratios so I can visually see what's happening. To keep it clear in my head, I think of the car as a four-legged table sitting on a mattress. . over). are favoring the left rear tire for better acceleration out of left
turns. Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. the sway bars because they fail so often and the bars only added a couple of
For that level of caring, I wouldn't think too much about it. You can see the article here:
R. racing junky Member. Yeah, I'm a little puzzled by my result when I let me car down on my new scales as well. Keep in mind the stiffer your springs the
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). Here's how we find the multipliers. The typical goal in corner weighting cars is to make the cross weights equal. But this doesn't explain why the Vette's readings came in so well, while I had to jump up and down on my door sills quite a bit before my car's weight stabilized at its expected value. 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. To find RF weight: Dirt Track setup - heymow.com the front ramps then jack up the rear and lower it onto the rear scales. Ah, OK, thanks for the clarification. %
Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. That is why it gets tighter. Cross Weight % =
Bite tells us how much we
Keeping track of Bite and
For now, we don't want the bar to influence the ride height or the weights we set later on.
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