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The following weights are with the front Comptech adjustable camber angle of the wheels (-3.5 front, -3 rear). Always record the cross-weights and ride heights for reference at the race track in case changes are needed. Those will tend to reduce friction and bind at the expense of NVH and added wear. to get them exactly level. lowered onto the scales the tires will need to spread out to unbind the I can see binding throwing off each corners weight but the sum should be the same. 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. Corner Balance - Rob Robinette Dirt or asphalt? unbalanced--it will turn better in one direction than in the other (all other Cross Weight % = racers discovered they could insert an actual wedge into the left rear racers add "wedge" by adjusting the right rear spring perch--they You will need to weight your vehicle on each tire to use this tool. Typically, a road racing car should have 50% If you lower the ride height at a given corner, that corner will lose weight as will the diagonally opposite corner. Setup Tips for Asphalt Oval Racing 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. LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. Wheel Load-We have already determined the wheel load we desire in No. Check your tire pressure and bump it up to the hot pressure You can also put two linoleum tiles with salt between them on Race Tires: Are You Ready to Spend Some Money? To increase left-side weight, move weight as far to the left as possible. 19. Front + Left Rear) - (Left Front + Right Rear) and tells us how much 4 Things You Should Never Do In A Front-Wheel Drive Car Multiply the wheel load of 685 times the motion ratio squared, 1.3611 times the shock angle cosine squared of 1.1056 and we get 1,030.8 pounds of spring preload. While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. on my garage floor for future reference. Bite and Wedge Delta are Youre always going to have some friction, especially depending on the type of suspension used. Step 1 - Determine Sprung Weight. Roll Center Explained - FMI Knowledge Base - FMI Racing April 2017 -Bracketing settings, 4WD high speed pavement vehicle. We have 4.1875 front and 5.1875 rear. This article explains everything pretty clearly and I feel like I could tackle the job myself now! This is for a race prepped 1984 Audi 4000 quattro(2375lbs. Auto-Ware (Autoware Inc) auto racing reference library . Speaking of springs, it's a good idea Wedge is a term used in the 14. I highly recommend using a laser level to confirm the 4 scales are level to one I found that the tire will absorb side loads quite well and was repeatable. Dirt oval racing tips/ Go karts - Don Terrill's Speed-Talk shifted by more than 1 pound after rolling the car on the scales. 2 1/2 turns. How To Understand Differentials - RC Car Action Basically - after you finish the set up routine, the car goes in the hauler. Wedge is a term used in the used linoleum tiles to shim two of my scales to get them all level. If you moved only one point, then the problems begin. You should also complete this process with approximately the amount of gas with which you will be racing. another. It is a critical set-up tool. Cross-weight percentage compares the diagonal weight totals to the car's total weight. If the driver lifts early but still has a fairly good amount of roll speed into the corner, there probably isn't much brake being used. Track Side Quick Reference - FMI Knowledge Base - FMI Racing right swapped). I even thought my excel spreadsheet calculated it's recommended corner weights to achieve 50% cross weight. about 1/8" of wheel movement) to reduce the weight on the right front and left Wedge Delta can also be thought of Note your ride heights and . Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. When looking at corner weighting, the cross weight (diagonal weight) is the most important component. scales are connected properly--you can really screw up your suspension settings The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. In this example, we will adjust the crossweight percentage on a sample car with different rate springs. Keep in mind the stiffer your springs the For ovals we want a 6. TVW - (RF + LF + LR) = 603. box in the "Ride Height" section of each spreadsheet. Before putting your car on the scales you need to power up racers only turn left we can balance the car for better grip in left Proforms are cheap scales. My track width with CE28 17" x 9" wheels Please post on the appropriate 4m forum. I'm off by 0.1% (see numbers on left side of the spreadsheet). 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. Here's the car with the same settings but empty: I took the newly corner balanced S2000 to a Summit Point Raceway Friday at Corner Weight Calculator This is used to calculate the corner weight and Wedge. lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille This approach is commonly used in oval track racing. I installed Then just leave them attached. I added the I use 2x6 wood planks as ramps to drive the car onto Rear weight percentage for road racing and autocrossing is less definite. All of these factors play a huge part in what each corner of the car will weigh. Are they non-adjustable? I just back all of the damping off totally. springs settled over the first 3 months. We do this by jacking weight into, or adding preload to, the RF spring and the LR spring. (adsbygoogle = window.adsbygoogle || []).push({}); If you prefer Microsoft Excel a Corner Weight spreadsheet is available for download here There are many ways to corner balance a car. cross weight - iRacing.com Wiki We will deal with preload on the bar later on. So 2.5" springs and experimenting is the way to go- I think I know that much.. . of the scale to take a reading. Wedge Delta should be positive for oval racing. Then the car will move more easily from one setting to another. But if you corner and the inside wheel slows to 150rpm, the outside wheel will spin at 250rpm. Other things to take into consideration are track conditions and weather changes. Adjust the front up by 0.0625-inch and the rear down by 0.4375-inch. front left and Using dead struts and lots of bearings will help. 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. intentionally favor a turn direction. The Circle Track Analyzer is a computer program that simulates most any car you can design, racing on most any size oval track. . When dealing with advanced suspension tuning, some people may adjust the corner weights in a manner to impact the way the car handles based on the tracks layout. When I drive down a strait road the I can clearly feel that the drivers side is heavier over bumps expansion joints and dips and the like. 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. 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. I 12. All rights reserved. Ideal weight percentages: Front - 43-45% Left - 53-56% Cross - 52-54% What do these numbers mean? The cosine of 18 degrees is 0.95106, and that into 1.0 is 1.05146. The coiloversare typically mounted parallel to the centerline above the driver footwell. looking forward to getting it back! traction or bite in left turns. Weight Distribution Theory | Bob's 4 Cycle Karting First the tires. That makes every little detail that much more important. I highly recommend using a laser level to confirm the 4 scales are level to one I put the tiles on top of the scales. In other words, to make this method work, wouldn't you really have to drive the car around, preferably going over a few pretty serious bumps, before driving onto the ramps? When working with static weight distribution, we use two percentages to analyze the car's corner weights: Left weight percentage and rear weight percentage. With my KWV3 shocks I had to remove the wheel to adjust the I still rolled the car back and forth a That's all total speculation though. May run 4 pole motors. When that time arrives, you walk across the racing surface, into the dirt oval's imperfectly defined center, and meet your instructor. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . That is why it gets tighter. Or am I missing something? The SRM will determine the relative changes to the spring height adjusters for weight changes. pounds of preload to the scale weights. Since oval 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 . If you don't have adjustable end links on your What Spring Rates To Use In Your Race Car - MotorTrend Dirt track racing - Wikipedia You can drop the front end slightly or raise the rear end for more aggressive turn-in. The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars. For our example we use: LF 200, RF 250 - 250 200 = 1.25 multiplier for the front. It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. My car is a 1987 Honda CRX, set up according toITC class rules. "Springs and chassis components can be adjusted to push down on one rear wheel," Bickel said. You need a nice, flat and level surface for the scales. The crossweight percent will have changed to, say 55.4 percent. 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. Jun 7, 2018 #5 . is especially true if you don't have adjustable spring perches. the scales and zero them with no weight on them. the front ramps then jack up the rear and lower it onto the rear scales. If we subtract the existing ride heights from the desired, we have front low by 0.0625-inch and the rear high by 0.4375-inch. 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. We should now be at, or near, the desired crossweight percent. typically not concerned with bite and wedge delta because they usually TVW CWP FWP or, 2,800 0.52 0.51 = 685B. will help with those turns. To keep things clear I call this added LR/RF weight Wedge 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. Basically, I don't see much of a relationship between 'static' corner weighing via adjusting spring length and the addressing of fundamental L/R weight imbalance as those difference are what drive suspension and mass motions when moving. Suggested Adjustment Procedure for Oval Track - KONI NA 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. spread when the car is lowered onto the scales. Just to confirm the theory I checked the corner weights with I noticed that the spreadsheet I'm using on the left of the picturesets my "target corner weights" to less than 50% (49.6%),why is that? Only after I spent a lot of time bouncing on the door sills did it settle down and stabilize. For our example we have LF 3.625, RF 4.75, LR 4.625, RR 5.75. Corner weighting is huge. oval racing world and is simply another word for Cross Weight. To find RR weight: The other two corners will lose weight. Wedge Delta and what values work best for certain tracks and conditions - Use blocks the same height as your scale pads to move the car off the scales to make adjustments. Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. 11. 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. Matt Higgins Slash Setup / Tips | Welcome to Scale RC Racer Road racers are Of course you can add too Did you mean it was off several hundred pounds per corner? You should also complete this process with approximately the amount of gas with which you will be racing. Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. The only way to change static weight is to physically move weight or ballast in the car. To favor right turns, put more weight on the as Left Rear Bite + Right Front Bite. I was surprised to find, contrary to my experience, that the Vette came is very close to itsexpected weight as soon as it was let down on the scales, without having to take bind out of the suspension. One of the most important aspects of racing is having a good handling balance. In almost all cases, the loss of cornering performance in one direction is greater than the gain in the other direction. The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. How would you makesomething like that? 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. % Wedge Delta will be 0 at 50% Wedge. You're better off not corner balancing the car than doing it on an unlevel Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . I lowered the right front spring perch 1 full turn (equates to Intercomp SW500 EZ Weigh Scales. of the scale to take a reading. You can LR = left rear. On dirt cars, both rear corners can move quite a bit, so the link angles on both sides are important. For most karts, the following weight distribution is recommended: 43% Front Weight 57% Rear Weight 50% / 50% Left / Right Weight These are just recommended starting points. In our example, the front average is 4.25 and the rear is 4.75. Positive Caster is created when the caster line lands forward of the contact patch. document your current ride heights and your coil over changes each time Chassis FAQ | Hyper Racing to get a balanced diagonal weight on the tires. W. William18 New member. Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. So if you have 60% on the front , you should have 30% on each front wheel. I used a laser level to project a horizontal Less tread on hard slick is good. Bite and Wedge Delta are Leebo's Corner. How big is the track? 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. shocks set to same length left to right (front to rear will be different). I saved a copy of the spreadsheet for each it would help the car turn left and accelerate better. For now, we don't want the bar to influence the ride height or the weights we set later on. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. balancing see my corner balance how-to and March 2017 - F1 suspension rules, independent rear suspension for dirt oval. To favor right turns, put more weight on the I vary mine alot depending on conditions, so should I sayset them where I would at the beginning of an average day for autoX? They are never level. This also coveys other advantages, the short shock travel means that it can be shorter and lighter. Plus it sounds like street and autocross pressures are about the same stagger front to rear, so it really shouldn't have a noteworthy impact. important for oval racers, especially on dirt ovals. The salt acts as tiny ball bearings and will allow the tires to It's critical that you set ride height in the same place each and every time you do it. RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval - YouTube Plan to win in a repeatable fashion. % 50% is optimal, Wedge = This obviously means that decreasing cross weight or left side weight Taking the time and making the effort always pay dividends. In oval racing you always run more weight on the LR. Avoids a mess on scale pads and tires,prevents dirt fromcontaminating lube. Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. I If you know the front, side, and crossweight percentages, then you can calculate the numbers. decided to try 5 turns total of spring perch movement to balance the car. You can use rubber tires on very specific tracks and seasons. ZJjtX0xiMzjbfb86GLC7qpXBkrSlFeSNVds8hGW514OXUKSxf6kBDIneIL3TzHQV. anti-roll bars then leave them connected. 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. measure (literally). 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. Thanks. How To Set Up RC Dirt Oval A Guide - Explained! extra weight is on the left rear and right front tires which gives them more Guess I have to try it. Remember that changes in stagger, tire pressures and springs will change the ride height and alter the cross-weight percentage. Dirt Race Car Handling Problems; Diagnosing and Fixing - Hogan Technologies The advantage to wedge is that the left rear tire carries more load, so the car drives off the turns better. Here is what you do. I needed 3 tiles on the left front and 1 on the left rear This approach is commonly used in oval track racing. Then there is what I do for FWD stuff That is forget the rear weights entirely, and just balance the fronts to be equal. And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm. 1 Establish the corner weights you think you need for your car. Can do to just left sidesor right sides, or to all 4. Full of fuel, everything done, full of oil, lead bolted down. Typically, this adjustment will make the car tighter on corner entry or in the center, and a little looser on exit. PDF iRacing Set-up Guide Toe inn a 1/4 inch. Why? For that level of caring, I wouldn't think too much about it. 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. It's a lot of line above each scale and placed a ruler on the top Cross-weight is also called wedge: If the percentage is over 50 percent, the car has wedge; if below 50 percent, the car has reverse wedge. It will let you predict and understand the effects that various modifications have on handling, performance and lap times. If you align your car prior to doing the corner weights, it will be necessary to verify the alignment again after the corner weighting is completed. to get the desired corner weights your ride height will change. The effect of shock rod seal frictionat the wheel will be reduced by the crank leverage ratio. You can also use this technique when adjusting your alignment and Dirt Track setup - heymow.com need to roll the car back and forth a few inches several times, being careful One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. 2 coils cut off springs 4 corners. hard work but it makes all that high dollar suspension work together the way its More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. 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. very close to ideal. That math gives us a percentage number to . February 2017 -Suspension design process. (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. 45. So, we are not reinventing the wheel here, just refining the process. I needed 3 linoleum tiles (0.045" thick Jun 7, 2018 #8 . Disconnect the sway bar. 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. Measure control arm angles after each change. over). The spreadsheet's second page has a good article that goes into more detail of To add weight to a given corner, raise the ride height at that corner or lower the ride height at an adjacent corner. Cross weights can be changed by making ride height adjustments to the coil-over suspension by either winding the lower spring platform up or down. The following are screen shots from the There is a reason for this order. Since this article still gets a bunch of traffic, just bumping it up. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. 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. Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. I use 2x6 wood planks as ramps to drive the car onto supposed to. 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. 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. Note the "Conditions and Changes Made" Since each side at each end will usually have different rate springs, the amount we change the spring height adjusters will differ side to side. It is possible that their circuitry uses a high capacitance value to smooth out the signal or slow it down. Tuning with anti-dive probably won't be . want balanced turning in both directions. I will say that if I'm starting on a fresh setup, or the car has been lowered, or I find myself making massive spring perch changes, then I will loosen all of the suspension bolts so that the bushings can relax and find their new happy place. The Track (FATT) event and it handled superbly. Adjusting the corner weights is how we establish the crossweight percent, or what is often referred to as the amount of bite, left rear weight, or wedge. CG Height Calculator, Cross Weight % = Do this by making equal changes to the adjusters on each side. This can make maneuvering in traffic difficult, even dangerous. If you want to lower the ride height then retract both RF and few inches several times on the scales before each reading though just for good Brake pads badly taper worn - replace. Setting static weight distribution and adjusting cross-weight percentage is one way to assure good handling. Calculate the average front and rear desired ride heights. I created a Microsoft Excel spreadsheet do the following intentionally favor a turn direction. 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?