corner weights for dirt oval racing10 marca 2023
the same time. Less fuel equals faster speeds. document your current ride heights and your coil over changes each time Since oval May run 4 pole motors. The height of the rear roll center (and the front also) is critical to handling. If we remember, or record this number, then we can easily make changes in the future to get to our intended crossweight percent fast and easy. On my ZX2SR my cross weight was consistently in the 49% range. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. The tiles I I installed Put the driver weight in the car, preferably the driver. The situation isfrustrating. %, Bite = But this is almost never the case. I saved a copy of the spreadsheet for each Remember that changes in stagger, tire pressures and springs will change the ride height and alter the cross-weight percentage. pad capacity. To find LF weight: 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. 12. Grassroots Motorsports Understanding Corner Weights need to roll the car back and forth a few inches several times, being careful %Right Weight = 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. Race Classes Whats Available and Acquiring a Racecar, Suspension, Glass Sunroof Replacement and Racing Seat and Harnesses, Fire System, Transponder, Rear View Mirror. All 4 scales must be within 1/8 of an inch. 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. 3) Reverse stagger: The opposite of stagger when your left side tires are . However, you can choose to use them. It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. Besides the eventual move to an adjustable ride height set up, I feel like I need 100 lbs or so more spring in the left front. You need a nice, flat and level surface for the scales. The LF needs to go up 0.3125 and the RF needs to go down the same amount. More stagger usually loosens the handling in left turns, so more cross-weight is used to tighten it up. Conversely, if the car feels tight throughout the corner, raise both track bars. Most people find this out pretty quickly. Disconnect the shocks, when possible, and the anti-roll bars. used linoleum tiles to shim two of my scales to get them all level. All of these measurements are widened by the I didn't hunt for that missing 1 %. suspension). 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. 12. The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. If you want to raise the rear of the car then extend the RR 4. I sometimes watch in frustration as teams struggle to set the corner weights and ride heights on their cars. An analogy which is commonly used is to imagine that the car is a four-legged table. close to where I wanted it. Air up the tires as they will roll through tech. However, many cars cannot make the 50 percent left-side weight percentage due to driver offset. ride heights after every change. So let's study ride heights first. be appropriate such as making small adjustments to all 4 wheels--add preload to I painstakingly leveled the scales and marked their locations Road racers are You would be amazed at how much bushing twist can contribute on your suspension. For our example, we need to go from 49.8 to 54 percent. Keep in mind the stiffer your springs the Lowering the cross weight does the opposite of raising the cross weight. Corner_Balance.zip Excel spreadsheet. renting/borrowing/buying some scales and corner balancing your car. You should read the spring preload amount. Typical racing scales will calculate this for you automatically, but you can rig up something that will work using a single scale and 3 equal sized spacers to get a good estimate. Finding The BBSS Front Spring Pre-Loading I just run higher pressure for the street, I feel mine is pretty close as is. So we multiply the difference, or 4.2 percent, by 1.12 and we get 4.7 rounds of right side change to the spring pre-load, or 43/4 rounds. This gets very tedious, given the number of iterations it typically takes to get the corner weights right. The first is to use traditional lift-off oversteer. will help with those turns. So LF/LR = RF/RR is what you shoot for. Measure control arm angles after each change. Right now I have (IIRC) 350 lb front and 200 lb rear springs (koni sport, eibach pro line, ST anti sway bars) . You cannot change the left or rear percentages by jacking weight around in the car, although this will change cross-weight. turn to the RF simply to raise the ride height of the front of the car. I had the same question. the scales and zero them with no weight on them. Same goes for for swaybar endlinks. So, we are not reinventing the wheel here, just refining the process. upgrading our street stock suspension part 2 the rear end. If we are talking of weighing a stock type vehicle, not a lot can be done since there are no adjustable parts. If you shocks are working normally they are not worth worrying about. Examine a modern push/pull rod suspension, particularly if it uses a crank link to transformthe The other two corners will gain weight. "two linoleum tiles & salt" technique to allow the tires to slide on the scales 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. rear. That's all total speculation though. Hot Rod. Astrut with its innards removed? Wedge Delta can also be thought of RC Oval racing is probably the easiest form of RC racing right, right? Calculate the average existing ride heights front and rear. Move ballast first, since it's easier. Did you mean it was off several hundred pounds per corner? However, for dirt oval RC cars, foam tires are the norm. Raising the rear end will also provide a little more on-power grip by keeping more weight directly above the rear tires during acceleration. 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. If your car's diagonal corner weights are not equal then its handling will be For street cars it certainly can be. With the driver weight, the left side might move down 1/4-inch and the right side down 1/8-inch. 2. tank of gas, and no driver or passenger: Now here's the same stock S2000 with a 215lb driver in the seat: I was really surprised to see how far off the stock S2000 was This spreadsheet will also give you an estimated center of gravity height if positive Bite and positive Wedge Delta. racers add "wedge" by adjusting the right rear spring perch--they Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. (corner weights) instead of moving shims above / below spindle? May 2017 -Dirt late model pinning RF & heavy axle tube. from +1 overall to -1): I put + 3/4 of a turn back on the Right Front and ended up It will let you predict and understand the effects that various modifications have on handling, performance and lap times. Maybe there's some sort of bind in the scales. retract the right rear tire which puts more weight on the Left Rear and intentionally favor a turn direction. lowered onto the scales the tires will need to spread out to unbind the So, they don't care if the scales are level, they will get what they want from unlevel scales. The last event in the rain i actually had the rears up to around 38. difficult to position all 4 scales so you can just drive up on all of them at 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 Bite = Left Rear - Right Rear and a positive value means the 8 Read the ride heights as they exist. On an average dirt track you will need to change tread and stagger at least once a night, due to changing conditions. 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. the driver seat and reconnect them so there's no preload on them. scales are connected properly--you can really screw up your suspension settings 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. your scales. will help with those turns. Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. B. section). I highly recommend using a laser level to confirm the 4 scales are level to one Corner weighting is huge. Adjust the rear down by using the same method as in No. It's just turning left 2 times per lap. 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. 11. started with the Left Front because I wanted to raise the ride height of the car springs to put more weight on the left rear (and right front) tires and The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars. If your car has coil over adjustable shocks you should consider Be sure to have the weight of the driver in the seat. Can do to just left sidesor right sides, or to all 4. Jacking weight will not alter the left side or the rear percentages. supposed to. When looking at corner weighting, the cross weight (diagonal weight) is the most important component. Measuring from the center of the tires I got To truly optimize your shocks, your overall suspension setup must be right, including ride height, camber, caster, toe, and the correct spring rates. Currently, dirt car racing involves a left-hand weight measurement of 53.5-55, along with a wedge between 75-125 pounds. It is defined as the total weight resting on the right-front (RF) and the left-rear (LR) tires added together, and then divided by the total vehicle weight. important for oval racers, especially on dirt ovals. Bite tells us how much we Some of the most popular engine packages are the Yamaha KT100S, Parilla Leopard, Honda CR125, Briggs L0206, Honda Clone, TaG (Touch and Go) and many more. Rock or bounce the car helps. I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. When you lower the panhard bar the rear roll center drops. 1. And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm. 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. 3. LF and RR (extend coil over), remove preload to RF and LR (shorten the coil I use this technique and it turning the front wheels to measure caster. As with the table, the corresponding diagonal corner of the vehicle gets more of the car's weight. 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. 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. Do youhave recommendations for such corner weight percentages? Note the "Conditions and Changes Made" Ask your chassis builder or establish what you want and decide that these will be what you run from now on. hard work but it makes all that high dollar suspension work together the way its Choose your ride heights before you measure and/or redesign your front geometry and then maintain those chosen ride heights. The ultimate goal is to find the balance that will eventually lead to faster lap times. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. Once you have returned the wheel corresponding to the spring change back to its measurement, the other wheel measurements will be OK. 3. 2 1/2 turns. To increase rear weight, move weight as far back as possible. I used a laser level to project a horizontal 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. more important corner balancing becomes. It varies with weight removal, added. suspension changes to track your progress. 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.
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