typically not concerned with bite and wedge delta because they usually
then set corner weights and cross weight. I dropped my integra off at edge to have this done today. Ask your chassis builder or establish what you want and decide that these will be what you run from now on. I didn't hunt for that missing 1 %. When looking at corner weighting, the cross weight (diagonal weight) is the most important component. Left Rear tire is carrying more weight so it will get more traction and
extra weight is on the left rear and right front tires which gives them more
work but in the end it's worth it. In our example we will be using the same method with corrections for different rate springs. I just back all of the damping off totally. to balance your car in one big step. There are legal issues too at the front. 5. And don't ever believe the track scales. Always try to start with the track bars first. 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). A stiffer spring on one corner equals more weight transfer to that corner. This keeps the ride heights as close to ideal as possible. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will be 50%. Wedge Delta and what values work best for certain tracks and conditions
2. In the above example, to go from 52 percent to 50 percent cross-weight, try lowering the right front and the left rear one-half turn on the weight jack bolt or spring perch while raising the left front and right rear the same amount. The first is to use traditional lift-off oversteer. The first spreadsheet below is what I started with. "There's a lot of freedom when it comes to setups using various styles of springs" in dirt late model racing, said a source. The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. traction or bite in left turns. scales are connected properly--you can really screw up your suspension settings
We had a good Miataset up for ST. Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. Battery: 2 cell lipo max want balanced turning in both directions. 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. Corner_Balance.zip, Excel Corner Balance Spreadsheet Screen Capture. Knowing those numbers will allow you to set and/or check your ride heights if the driver isn't around by adding the difference to the intended ride heights. 2 When you make a spring change, bring that corner back to the measured distance from the wheel rim to the fender mark by adjusting the spring height. 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. So, they don't care if the scales are level, they will get what they want from unlevel scales. 2. Classic Truck. Examine a modern push/pull rod suspension, particularly if it uses a crank link to transformthe Use those racing internet forums, and dont be timid about asking for some assistance! 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. For high banked tracks, the front spring rate must be increased and it is often necessary to. Recheck air pressure often to assure ride heights stay consistent. Make sure the tires are centered on the scales. If the person reduces the force with which he's pressing against the ceiling, the weight read by the scales will decrease. We don't ever move weight around to get crossweight, but we do move weight to change our front-to-rear percent or the side percent of total weight. This can make maneuvering in traffic difficult, even dangerous. 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? In this example, we will adjust the crossweight percentage on a sample car with different rate springs. Typically, a road racing car should have 50%
To favor right turns, put more weight on the
To make sure your spring changes don't upset your ride heights or crossweight percent, you need to mark your wheel spacing to the fenders. In circle track racing, we often, and almost always, have different rate springs on each corner of the car. Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or . turns. Corner balancing, sometimes referred to as "corner weighting,"
We have 4.1875 front and 5.1875 rear. Moving weight to the front of the kart will provide more front-end grip. Here's a box stock 2006 Honda S2000 with 5/8 of a
We do this by jacking weight into, or adding preload to, the RF spring and the LR spring. shouldn't match the front to the rear but your left front and right front shocks
You could also raise the left front or right rear ride heights to do the same thing. Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. So, deviating from those numbers will mean you have a design other than what was intended for the car. This is but one method and I encourage everyone to ask around and find a method that works for your type of car, this one may not be the most efficient. 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. looking forward to getting it back! Basically - after you finish the set up routine, the car goes in the hauler. It was a good car. But in a right turn, the opposite occurs and the handling is worse. Measuring from the center of the tires I got
The angles are another way to set the suspension for the desired ride height and cross-weight percentage. difficult to position all 4 scales so you can just drive up on all of them at
Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. Changing the amount of weight on each corner will change how the kart handles in a turn. In almost all cases, the loss of cornering performance in one direction is greater than the gain in the other direction. Brake pads badly taper worn - replace. 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. Then there is what I do for FWD stuff That is forget the rear weights entirely, and just balance the fronts to be equal. You can also estimate your car's
Corner weighting is huge. 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. 8 Read the ride heights as they exist. It's
the driver seat and reconnect them so there's no preload on them. car for a week to let the suspension settle: I decided to disconnect the front and rear sway bars to see what
I just run higher pressure for the street, I feel mine is pretty close as is. 2. "two linoleum tiles & salt" technique to allow the tires to slide on the scales
50% then Wedge Delta will be 0. Measure control arm angles after each change. These weights are in ready to race form (including driver on board). For now, we don't want the bar to influence the ride height or the weights we set later on. 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. It has to, it's just the laws of physics. Drag Racing. values shown below are totally fictional. To find RF weight: We also change the rear to correct the side-to-side rake by turning the RR adjuster up (to lower the corner) by 2.5 turns and the LR adjuster down (to raise that corner) by 2.5 turns. This approach is commonly used in oval track racing. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. Grassroots Motorsports Understanding Corner Weights
Taking the time and making the effort always pay dividends. I made a 4-scale system for my off-road cars. So if you have 60% on the front , you should have 30% on each front wheel.
Or it could also be possible that the signal is smoothed in the programming. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. Cross Weight or Wedge. 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. front left and
corner weight calculations: Corner_Balance.zip
Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. Record these. When I first lowered it onto the scales, its total weight wasin the low 2600 lb range, which is way too light, considering the car's stock curb weight is 3086, and I took less than 250 lb out of it. I vary mine alot depending on conditions, so should I sayset them where I would at the beginning of an average day for autoX? weights into the spreadsheet (the blue numbers in the left "Corner Weights"
I was booked for 100 laps split across four or five sessions. Intercomp SW500 EZ Weigh Scales. To get good accuracy easily make sure you get the low hanging fruit first like removing the friction between the tires and the scales so there is no bind. Equal weight on each front wheel, same on the rear. Wedge
If you think you need to make crossweight changes, remember the amount of change per adjuster number, in our case it was 7/8 turns per percent of crossweight at the right sides (left sides again are times the multiplier), and make even percent changes, such as a half percent or whole percent. The CG height
Other things to take into consideration are track conditions and weather changes. You can also use this online calculator to compute your corner
A. Iretighten them after I've made all my adjustments. The situation isfrustrating. On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. All rights reserved. Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. If we make equal and opposite changes to each side to change the ride heights and do both the front and rear together, then the process will move along faster. (CG) height by using this online calculator: CG Height
R. racing junky Member. Set them to hot pressures is the norm as I understand it. This was my first adjustment: Four turns of positive coil
< Enter your corner weights in pounds or kilos and click 'Calculate'. You can
if you have any of the scales connected improperly (i.e. turns to the Right Rear: I still needed more weight on the LF and RR so I added +4 to the LF: I still needed more so I added +2 to the RR and drove the
Front + Left Rear) - (Left Front + Right Rear) and tells us how much
your scales. track are left turns then having more weight on the Right Front and Left Rear
In order to perform the set up routine the car needs to be completely ready to race. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. Here is a screenshot with some random-ass corner weights. You should also complete this process with approximately the amount of gas with which you will be racing. Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. Doing the multiplication to square that number, we get 1.1056. 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. The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. - Use blocks the same height as your scale pads to move the car off the scales to make adjustments. Still, it is a worthwhile goal to strive for 50 percent left-side weight. Since I went to 800 front and 700lb rear springs over the winter I
Positive Caster is created when the caster line lands forward of the contact patch. Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. Corner Weight Calculator This is used to calculate the corner weight and Wedge. I
57.5" front and 59.625" rear. I installed
Delta which is simply the difference between the two diagonal tire weights. Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. per wheel.
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. Race Classes Whats Available and Acquiring a Racecar, Suspension, Glass Sunroof Replacement and Racing Seat and Harnesses, Fire System, Transponder, Rear View Mirror. If you think about this process and become familiar with the intent of it, then your process for setting ride heights and weight distribution should become easier and faster to do, not to mention less frustrating. Rock or bounce the car helps. More wedge means that the car will likely understeer more in a left turn. more traction or bite in left turns. You can lower the cross weight to help on tacky tracks.
June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . I highly recommend using a laser level to confirm the 4 scales are level to one
Corner weighting can be a complicated process for you to complete without someone who is experienced helping you. 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. Here's how we find the multipliers. racers add "wedge" by adjusting the right rear spring perch--they
To find RR weight: It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. This makes the cornering force balanced from left to right and offers the best performance overall. Road racers can take a page out of the oval racing book and
Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. Do this by making equal changes to the adjusters on each side. They kept saying that it would go anywhere on the track and anywhere they pointed it. That makes every little detail that much more important. Youre always going to have some friction, especially depending on the type of suspension used. started with the Left Front because I wanted to raise the ride height of the car
Our current setup is as follows - 270 lbs Car & Driver Cross Weight = 48% Rear Weight = 61% Left Side Weight = 51% LF = 56 lbs RF = 48 lbs LR = 82 lbs RR = 83 lbs
Prepare the car. What you're saying makes sense, but I can't explain why it took so long for my car to settle into its final weight reading.