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. that turns equally well in both directions. Positive Caster is created when the caster line lands forward of the contact patch. Taking the time and making the effort always pay dividends. rear should be the same. Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. Calculate the average front and rear desired ride heights. Other than that you need to watch the suspensions. Road racers are
How NASCAR Wedge Adjustments Work | HowStuffWorks Remember that this is a sample car, so don't use these numbers, but do use this method. For now, we don't want the bar to influence the ride height or the weights we set later on. . Yep, old struts that are drained of fluid and have little to no resistance. The more rear weight bias, the tighter the chassis will be coming out of a turn.
Track Side Quick Reference - FMI Knowledge Base - FMI Racing The shock length as it is installed in the car at ride height. typically not concerned with bite and wedge delta because they usually
over). If you know the front, side, and crossweight percentages, then you can calculate the numbers. Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. 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. Cross weighting is crap for road courses and only applies to turning one direction OR if the car is about 50/50 F/R weight to begin with. In our example, move the LR and RR corners down by 0.4375-inch. 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. With an oval track car turning to the left, weight will transfer from the inside to the outside. Today's oval
can help us get our setup right with less testing. more important corner balancing becomes. track are left turns then having more weight on the Right Front and Left Rear
Oval
In oval racing you always run more weight on the LR. surface. Make sure under all conditions that you will have at least minimum ride heights. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up.
How To Corner Weight Your Car - Suspension Secrets 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.
The following weights are with the front Comptech adjustable
I dropped my integra off at edge to have this done today. Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. 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 RF coil over 5 turns. Full of fuel, everything done, full of oil, lead bolted down. Jun 7, 2018 #8 . right swapped). Equal weight on each front wheel, same on the rear. It was a good car. (corner weights) instead of moving shims above / below spindle? and measured between the outside bottom rim edge is 67.75" front and 69.875"
Well there is a bit more to it than that. Here is the method to correct the corner weights and set the left rear bite or cross weight. Brake pads badly taper worn - replace. Corner balancing, sometimes referred to as "corner weighting,"
You can also put two linoleum tiles with salt between them on
Matt Higgins Slash Setup / Tips | Welcome to Scale RC Racer the scales and zero them with no weight on them. We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. Unsure about autox. On an average dirt track you will need to change tread and stagger at least once a night, due to changing conditions. Check your tire pressure and bump it up to the hot pressure
13. Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. Only after I spent a lot of time bouncing on the door sills did it settle down and stabilize. Since I went to 800 front and 700lb rear springs over the winter I
1. The last event in the rain i actually had the rears up to around 38. A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. rear. Raising the rear end will also provide a little more on-power grip by keeping more weight directly above the rear tires during acceleration. 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 added the
I've actually lowered a miata a decent amount just by forcing the bushings around. Calculator, I used these scales to weigh the car:
That makes every little detail that much more important. 35 psi hot tire pressure target .
How to Properly Use a Penske Shock Tuning Guide to Optimize Your Measure control arm angles after each change. If you lower the ride height at a given corner, that corner will lose weight as will the diagonally opposite corner. For our example we use: LF 200, RF 250 - 250 200 = 1.25 multiplier for the front. Do youhave recommendations for such corner weight percentages?
Commodore's Garage #19 - Crossweight - iRacing.com works well. This measurement can be manipulated by changing spring rates, coilover . 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. You can also use this technique when adjusting your alignment and
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. % 50% is optimal, Wedge =
Here are some setup tips that will help you really get the most of of your Slash: > Keep it clean. You can lower the cross weight to help on tacky tracks. them for the corner balance. May run 4 pole motors. on the right front and left rear tires. Cross weight and left side work backwards in terms of adjustment. Most people find this out pretty quickly. 3) Reverse stagger: The opposite of stagger when your left side tires are .
Setting Up Your Traxxas Slash | Traxxas We do this by jacking weight into, or adding preload to, the RF spring and the LR spring. Do this by making equal changes to the adjusters on each side. 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. few inches several times on the scales before each reading though just for good
Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. links then disconnect them for the corner balance. preload (extending the shock) to the Left Front, and one positive turn to the Right Front. When I weigh my cars I try not too overthink all this binding stuff. The car is built on a jig for a particular ride height layout. If you don't have adjustable end links on your
Same goes for for swaybar endlinks. This will pitch the vehicle's. So, we are not reinventing the wheel here, just refining the process. 3. Dirt or asphalt? Always record the cross-weights and ride heights for reference at the race track in case changes are needed. The only way to change the static weight distribution percentages is to physically move weight around in the car. Classic Truck. Proforms are cheap scales. Just to confirm the theory I checked the corner weights with
Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. I
As an autocrosser I've always thought that cross weight should be set at 50% and be done with it. 4. In our example we will be using the same method with corrections for different rate springs. And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm.
The "ULTIMATE" Racing Car Chassis Setup Guide and Tutorial Just make sure none of them are flat or wildly overinflated. (TVW LSP) - LF = 769D. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . 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. 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. Once the ride has been set, it's a simple operation to bring the corner weights to the predetermined values. lowered onto the scales the tires will need to spread out to unbind the
the same time. Why? It would just automatically settle. bite, a negative value means the Right Rear is favored. There are many ways to corner balance a car. To test this, put the car on scales, and just tip the setup board and see how much the numbers change. 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. 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. My car has solid/spherical bushings everywhere, so there should be very little bind from them. But this is almost never the case. 10. it would help the car turn left and accelerate better. 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. Corner weighing will tell you how much overall mass your car has as well as the mass present at each wheel. This gets very tedious, given the number of iterations it typically takes to get the corner weights right.
Oval Set-up Black Book | IROAR - Radio Control Racing All 4 scales must be within 1/8 of an inch. For our example, we use LF 4.00, RF 4.50, LR 4.50, RR 5.00. Weight can be moved around at the track to fine tune the handling characteristics of the chassis. 8 Read the ride heights as they exist. 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. This allows a slightly lower rear stance, which provides a good weight transfer entering a corner. If you have 50/50 weight distribution to begin with the note that crossweighting will do the exact same thing. Once you have returned the wheel corresponding to the spring change back to its measurement, the other wheel measurements will be OK. 3. When Wedge is balanced at
weights and percentages and generates target wheel weights to achieve a 50%
want balanced turning in both directions. Search for: Recheck air pressure often to assure ride heights stay consistent. lot of force to the suspension. want balanced turning in both directions. Calculate the spring rate multiples. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . All of these measurements are widened by the
spring perch so I left my jacks in place between lifts and only put two lug nuts
Wheel Offset Changes. I had the same question. Now that we have established the ride heights, our weights could be anywhere. 11. 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. the sway bars because they fail so often and the bars only added a couple of
My track width with CE28 17" x 9" wheels
Right Front =
To increase left-side weight, move weight as far to the left as possible. The first spreadsheet below is what I started with. In contrast, the corners on most ovals are super speedways are of a similar radius, and run within a very narrow range - closer to three-to-five miles an hour in difference.
How To Be Fast With Front-Wheel Drive: An Expert Explains - Jalopnik A place where you can add in your Photo Galleries. 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. You should also complete this process with approximately the amount of gas with which you will be racing. Wedge is a term used in the
(CG) height by using this online calculator: CG Height
Front + Left Rear) - (Left Front + Right Rear) and tells us how much
(TVW FWP) - RF = 743C. Yeah, I'm a little puzzled by my result when I let me car down on my new scales as well. bite, a negative value means the Right Rear is favored. Doing the multiplication to square that number, we get 1.1056. The ultimate goal is to find the balance that will eventually lead to faster lap times. And what do you mean by "lots of bearings"? 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).
This was my first adjustment: Four turns of positive coil
For ovals we want a
Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? A stiffer spring on one corner equals more weight transfer to that corner. Today's oval
I recommend you start with your car at your desired ride
close to where I wanted it. Here is a screenshot with some random-ass corner weights. not to push it off the scales, to unbind the suspension (as the car is
see on the right side of the spreadsheet's "Target Corner Weights" section that
Delta which is simply the difference between the two diagonal tire weights. Free Download Chapter listings from. Once you get the car up on the scales you'll
I looked back and I don't think I've ever done an article on this subject and I can't understand why.
How to Adjust iRacing Sprint Car Cross Weight AKA Wedge First some baselines. In April 2013 I corner balanced the S for the first time in
Now that we have the front-to-rear rake set, we adjust the side-to-side rake. CG Height Calculator, Cross Weight % =
If it slows to 100rpm, the outside wheel will spin at 300rpm. For example, if you are racing the Briggs Light class at 305 pounds, your corner weights should be: LF = 68 pounds RF = 68 pounds 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. in left hand turns than in right turns. Wheel Load-We have already determined the wheel load we desire in No. 2. Move ballast first, since it's easier. difference that made. 57.5" front and 59.625" rear. I installed
Speaking of springs, it's a good idea
Leebo's Corner. A good starting point would be tank of gas.
Understanding corner weights | Articles | Grassroots Motorsports On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. April 2017 -Bracketing settings, 4WD high speed pavement vehicle. I was surprised how much these high rate
It's always possible that there's something wrong with my scales - I'll call their manufacturer and get their input an recommendations, and I'll let everybody know what they say. the scales and zero them with no weight on them. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF.
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