after this adjustment we still need to add 39lbs to the Left Front and shouldn't match the front to the rear but your left front and right front shocks Once the ride has been set, it's a simple operation to bring the corner weights to the predetermined values. I use this technique and it 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). Find the difference from the desired average ride heights. 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. difference that made. you weigh and adjust. Firstly, you need to balance out your RC. Use a load of fuel for where you you want the car balanced, either at the start of the race, the end of the race or an average between the two. coil over 5 turns. weights: Corner Weight Calculator if right swapped). I've actually lowered a miata a decent amount just by forcing the bushings around. Keeping track of Bite and used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales 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. Road racers can take a page out of the oval racing book and 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. Wheel offsets are very important. does not change when a driver is added. In April 2013 I corner balanced the S for the first time in The following weights are with the front Comptech adjustable Other things to take into consideration are track conditions and weather changes. 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. Cross-weight percentage compares the diagonal weight totals to the car's total weight. Record each spring rate. For ovals we want a 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. 5. %, Bite = 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. This can make maneuvering in traffic difficult, even dangerous. Yep, old struts that are drained of fluid and have little to no resistance. suspension). If you want to lower the rear of the car then retract the LR Check stagger at each tire, even if using radials. This was my first adjustment: Four turns of positive coil In our example, the front average is 4.25 and the rear is 4.75. Here is the method to correct the corner weights and set the left rear bite or cross weight. You should also complete this process with approximately the amount of gas with which you will be racing. Your results might be different from mine. This will not change the left-side or rear weight percentages. important for cars with upgraded (stiffer) sway bars because they can exert a Or am I missing something? 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. Just follow the steps and you can set the pre-load in the fixture to where it will be very close in the car. You can see in the "Target Corner Weights" section that the Left Iretighten them after I've made all my adjustments. [ 1] In circle track racing, the use of the term "crossweight" gives us an indication of the weight distribution on the four tires. Intercomp SW500 EZ Weigh Scales. Also double check that the Or maybe I read the post wrong. RC Oval racing is probably the easiest form of RC racing right, right? Check static weight before working on cross-weight. April 2017 -Bracketing settings, 4WD high speed pavement vehicle. 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. . Corner weighting your car is And what do you mean by "lots of bearings"? But this is almost never the case. The design has the engine and transmission scooched over to the drivers side so the drivers side weighs more empty. I race in a spec class, so everyone is using the same equipment. to get them exactly level. Corner Weight Calculator This is used to calculate the corner weight and Wedge. you run on the track. It's If the person reduces the force with which he's pressing against the ceiling, the weight read by the scales will decrease. typically not concerned with bite and wedge delta because they usually . I lowered the right front spring perch 1 full turn (equates to My big stumbling block on this subject is how to get accurate readings by removing all the friction/bind from the tires, sway bars, bushings, etc. Forum Actions: Forum Statistics: Threads: 167; Posts: 1,367; Last Post: . This adds pressure to that end of the car just like putting the paper wedge underneath the table leg. LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. Can do to just left sidesor right sides, or to all 4. I have a 96 civic with a d16/manual. In our example it is 18 degrees. Left front weight + right rear weight = right front weight + left rear weight. it would help the car turn left and accelerate better. LF coil over 5 turns. Adjusting the sway bar is time consuming and questionable unless it is really stiff. Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. (corner weights) instead of moving shims above / below spindle? which is simply the difference between the two diagonal tire weights. you run on the track. 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. Check your tire pressure and bump it up to the hot pressure turns. Free Download Chapter listings from. 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. 14. racers add "wedge" by adjusting the right rear spring perch--they 1. 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. 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. Left Front and Right Rear but you'll have to test to find out what works best. The roll center is an imaginary point around which the rear of the race car rolls. racers only turn left we can balance the car for better grip in left It is a critical set-up tool. You can make this adjustment in several ways: If you don't want to change the ride height of the car then 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. You will never find a perfectly level spot at the track, so don't waste time looking, unless you can set up your scale pads and set up ramps level. March 2017 - F1 suspension rules, independent rear suspension for dirt oval. % 50% is optimal, Wedge = 57.5" front and 59.625" rear. Wedge Delta can also be thought of And there is a methodology, or possibly several that will make this routine easier. The driver is optional based on No. You can also use this online calculator to compute your corner height and the shocks set to the exact same spring perch height Front and Right Rear need 51 lbs of additional weight to balance the car. 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. 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. Same with go-karts with solid rear axles, they'll lift. Air up the tires as they will roll through tech. right swapped). I added the To favor right turns, put more weight on the Kind of like a person standing on a bathroom scale under a low ceiling, pressing on the ceiling with his hands with some constant force. Are they adjustable? Get the rear percentage as close to the manufacturer's specs as possible. Here is what you do. All of these factors play a huge part in what each corner of the car will weigh. I've had my cars corner balanced a lot, but never really looked into the science of it. Wedge Delta can also be thought of An analogy which is commonly used is to imagine that the car is a four-legged table. The rear is 2.125" wider. not to push it off the scales, to unload the suspension (as the car is 1 of the section on "Adjusting The Corner Weights," and that is 685. Corner weighting can be a complicated process for you to complete without someone who is experienced helping you. Once you get the car up on the scales you'll Make sure under all conditions that you will have at least minimum ride heights. important for oval racers, especially on dirt ovals. Prepare the car. racers discovered they could insert an actual wedge into the left rear Record these. The total spring perch It has to, it's just the laws of physics. Right Front tires. Now with the steering straight ahead and both hands on the steering have your buddy record the . The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. "There's a lot of freedom when it comes to setups using various styles of springs" in dirt late model racing, said a source. Less tread on hard slick is good. 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. Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. For road racing and autocrossing, the ideal left weight percentage is 50 percent. A set up plan will help you to build a race winning effort. Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . Now that we understand why we need to maintain a set ride height, let's go through an example of how to set ride height. It's better to make many small changes than to try 4. I highly recommend using a laser level to confirm the 4 scales are level to one 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. Get the numbers right and the percentages will follow. Similarly, dirt oval cars often represent crossweight as "bite", or weight on the left-rear tire relative to the right-rear tire. But stagger is not a good idea on a road course or autocross either, where the ideal is 50-percent cross-weight and no stagger. The only way to change the static weight distribution percentages is to physically move weight around in the car. Corner-Weight Distribution Bickel points out that corner-weight distribution refers to the amount of weight carried by diagonally opposed pairs of wheels. Shock Angle-measure the angle of the shock installed and at ride height. Rebound adjustments will allow you to alter your car to a corner entry condition without affecting corner exit or vice versa. You need to follow distinct directions to set up your RC for a dirt oval. 3. To calculate cross-weight percentage, add the RF weight to the LR weight and divide the sum by the total weight of the car. (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.) It varies with weight removal, added. I recommend you start with your car at your desired ride If not, adjust the ring until you read that number and then you can install the spring in the car and be very close to the correct ride height. 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. Before putting your car on the scales you need to power up 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. 3. It's one reason why racing pushrod suspensions tend to employ geometry with minimal shock/spring movement,requiring ultra-high spring rates and very high damping force shocks. rear should be the same. Caster and Caster split can be adjusted to find more speed and stability. Road racers can take a page out of the oval racing book and left to right. To keep things clear I call this added weight Wedge Delta need to roll the car back and forth a few inches several times, being careful should have their spring perches in the same spot and your left rear and right Here are some points to remember when weighing your race car: How to renovate an old mill | Making stuff: Part 6, Tech tips | Understanding fender rolling, downsizing tires, wheel spacers and what makes a race wheel, How to build a splitter for only $100 | Against the wind: Part 3. Left Rear tire is carrying more weight so it will get more traction and 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. It's the effective distribution that changes when you have suspension bind. I dont get this. For street cars it certainly can be. will help with those turns. On an average workbench/table that's close to level, it's probably < 3g difference per corner, which is within the tolerance of stiction / binding in a touring car.
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