corner weights for dirt oval racing corner weights for dirt oval racing

used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales Intercomp SW500 EZ Weigh Scales. car for a week to let the suspension settle: I decided to disconnect the front and rear sway bars to see what If you have uneven mass on your wheels then your tyres will all have different levels of grip which can lead to an unpredictable car on circuit and make it corner faster in one direction than the other. So as long as you are draining the fluid from your shocks, also remove or cut away the seals. I lowered the right front spring perch 1 full turn (equates to Ah, OK, thanks for the clarification. There is a reason for this order. 2. 5. . Bite tells us how much we Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. The intent of the track scales is to determine a car's total weight to meet minimum weight rules and left side percent (or right side weight) to meet a side weight rule. unbalanced--it will turn better in one direction than in the other (all other positive Bite and positive Wedge Delta. Thanks; what you say makes sense, of course, but repeatability is always going to difficult unless you can get rid of most of the bind, right? At the time Honda was still favoring their home market I reckon. Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. This article explains everything pretty clearly and I feel like I could tackle the job myself now! racers only turn left we can balance the car for better grip in left the front ramps then jack up the rear and lower it onto the rear scales. in left hand turns than in right turns. First off, you must maintain the legal ride height to pass tech. For ovals we want a Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. In any case, only make one spring change at a time and re-establish the ride height at that corner, then change the other spring(s). rear and tried again but I still needed more weight off the right front and left Recheck air pressure often to assure ride heights stay consistent. can help us get our setup right with less testing. Front + Left Rear) - (Left Front + Right Rear) and tells us how much Wedge Delta should be positive for oval racing. I didn't hunt for that missing 1 %. Calculate the average front and rear desired ride heights. On my ZX2SR my cross weight was consistently in the 49% range. bite, a negative value means the Right Rear is favored. The situation isfrustrating. Motion Ratio of the lower control arm. Rear weight percentage for road racing and autocrossing is less definite. But this is almost never the case. Your car may be designed to run different ride heights than these. ride heights after every change. W. William18 New member. Understanding corner weights. Or do you just mean an old, worn-out strut? I have now added the ratios so I can visually see what's happening. "weight jacking," or "scaling," involves adjusting the spring perches of a car Afterward you need to adjust the settings to the correct maneuvers. Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. coil over 5 turns. When you adjust your coil overs And I cannot really move any weight around. The CG height If your car's diagonal corner weights are not equal then its handling will be Now that we understand the value in maintaining ride heights, just what heights do we want? Are they non-adjustable? It would just automatically settle. Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. You would be amazed at how much bushing twist can contribute on your suspension. Andy Hollis does this. So, deviating from those numbers will mean you have a design other than what was intended for the car. Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car. I stretched my tires to get the RR right and now I'm . extra weight is on the left rear and right front tires which gives them One of the most important aspects of racing is having a good handling balance. In April 2013 I corner balanced the S for the first time in Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. Other than that you need to watch the suspensions. I put the car on the scales and input the four corner Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. 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 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. 2 1/2 turns. I started out with the KW spring perches set exactly the same Take care that the car does not accidently slide off the scale pads. spread when the car is lowered onto the scales. 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. Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or . In our example, move the LR and RR corners down by 0.4375-inch. It's better to make many small changes than to try 8 Read the ride heights as they exist. 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. If your car has coil over adjustable shocks you should consider it would help the car turn left and accelerate better. This adds pressure to that end of the car just like putting the paper wedge underneath the table leg. front left and 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. We had a good Miataset up for ST. 12. 2. That's all total speculation though. Toe inn a 1/4 inch. 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. Motors / ESC: Any 1/10th scale motor/esc combo allowed. decided to try 5 turns total of spring perch movement to balance the car. Shock Angle-measure the angle of the shock installed and at ride height. It varies with weight removal, added. When looking at corner weighting, the cross weight (diagonal weight) is the most important component. Adjustable end links are more turns. The car should be at minimum weight, using ballast as needed to make the proper weight. I created a Microsoft Excel spreadsheet do the following If you do have adjustable end For information on corner No, not as in the law, but in being legal in tech. be appropriate such as making small adjustments to all 4 wheels--add preload to 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. This will not change the left-side or rear weight percentages. For example, if your initial setup is 52 percent cross-weight, and you want 50 percent cross-weight, lowering the right front or left rear corner will decrease cross-weight percentage. 13. work but in the end it's worth it. shifted by more than 1 pound after rolling the car on the scales. 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. Road racers can take a page out of the oval racing book and If you don't have adjustable end links on your anti-roll bars 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. Some racers like to take matters into their own hands-and that's OK. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. Wedge Delta is equal to (Right So 2.5" springs and experimenting is the way to go- I think I know that much.. . We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. The salt acts as tiny ball bearings and will allow the tires to want balanced turning in both directions. 4m.net - The Most Opinionated Racing Message Board In The Universe. Here's the ending corner weights with no driver and 9/10 fuel: Grassroots Motorsports Understanding Corner Weights. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. 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. if you have any of the scales connected improperly (i.e. In our example, the front average is 4.25 and the rear is 4.75. I installed from a balanced Cross Weight. It's a lot of Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. The only way to change the static weight distribution percentages is to physically move weight around in the car. When a NASCAR crewchief says he's "adding wedge", works well. Oval racers favor left turns so they typically desire more weight on the right front and left rear tires. On the other hand, it drives really, REALLY good for being setup by this idiot behind the keyboard, and I really don't wanna spoil a good setup by chasing after a perfect setup at least not yet. The angles are another way to set the suspension for the desired ride height and cross-weight percentage. adjustment so I have a history of each adjustment. weights: Corner Weight Calculator if This also coveys other advantages, the short shock travel means that it can be shorter and lighter. 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. There are legal issues too at the front. Today's oval Corner Weighting The advantage to wedge is that the left rear tire carries more load, so the car drives off the turns better. The rear is 2.125" wider. 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. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. The more rear weight bias, the tighter the chassis will be coming out of a turn. Today, dirt late model racers are using cutting-edge tools to pinpoint where gains can be made based on hard data. Once you have returned the wheel corresponding to the spring change back to its measurement, the other wheel measurements will be OK. 3. You will have to repeat this every time you lower the car onto Bite and Wedge Delta are If the car feels loose throughout the corner, lower both track bars evenly. Set them to hot pressures is the norm as I understand it. per wheel. lot of force to the suspension. The LF needs to go up 0.3125 and the RF needs to go down the same amount. turning the front wheels to measure caster. [Up] [CornerBalanceCalculator] [CGHeightCalculator], This calculator takes your car's four wheel weights and calculates current Check your tire pressure and bump it up to the hot pressure of the scale to take a reading. In almost all cases, the loss of cornering performance in one direction is greater than the gain in the other direction. If one leg is longer or shorter than the others, the table will rock and thus be unstable. 3) Reverse stagger: The opposite of stagger when your left side tires are . So let's study ride heights first. Proforms are cheap scales. RC Oval racing is probably the easiest form of RC racing right, right? 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. The driver is optional based on No. retract the right rear tire which puts more weight on the Left Rear and To increase rear weight, move weight as far back as possible. For ovals we want a This obviously means that decreasing cross weight or left side weight of the scale to take a reading. Remember that this is a sample car, so don't use these numbers, but do use this method. 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. 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. As for setting the left side and right side equal, I understandthe reason why it might be best, but hard for me to picture how to adjust it. Since oval 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. I don't like the lower weight ratings and plastic scale pads of proform. If you want to raise the rear of the car then extend the RR 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. Grassroots Motorsports Understanding Corner Weights Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. A good starting point would be tank of gas. To find LF weight: 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). Bite tells us how much we LF coil over 5 turns. Cross Weight or Wedge. scales are connected properly--you can really screw up your suspension settings You will have to repeat this every time you lower the car onto Corner-Weight Distribution Bickel points out that corner-weight distribution refers to the amount of weight carried by diagonally opposed pairs of wheels. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will be 50%. see on the right side of the spreadsheet's "Target Corner Weights" section that 1) Tweak: Tweak is the amount of weight on the LR as opposed to the RR. That method keeps the ride heights close to the same. The more power a car has, the more that static weight over the drive wheels helps acceleration off the corners. racers discovered they could insert an actual wedge into the left rear Bite = Left Rear - Right Rear and a positive value means the The roll center is an imaginary point around which the rear of the race car rolls. Measure control arm angles after each change. However, most importantly you need to take care of the handling. Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. the scales. Equal weight on each front wheel, same on the rear. bite, a negative value means the Right Rear is favored. 57.5" front and 59.625" rear. Thinking about this a little, the weight measured by the scales is the sum of the force of gravity acting on the car's mass, and the force of the springs pressing downward. This spreadsheet will also give you an estimated center of gravity height if Record these. weights into the spreadsheet (the blue numbers in the left "Corner Weights"