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#1 Posted : Thursday, November 17, 2016 4:52:16 PM(UTC)

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Does anyone offer scale stands for scaling a car to keep it perfectly level like karts do? How does everyone typically scale?
Mike Dicely  
#2 Posted : Friday, November 18, 2016 6:55:16 AM(UTC)
Mike Dicely

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Most micro sprint guys do not scale their cars. But when we scale a car we just do it on a level part of the shop floor, Here is a bit I wrote about scaling in a rant a while back.

Remember that scaling only tells us a small part of the story. It tells us how fast the car is when it is sitting still, like in the garage. It does not tell us anything about what the car is going to do once we turn the car, this is when all the weight transfers and factors like center of gravity height, roll centers, tire offsets, and spring rates come into play. But if you want to scale the car this is what I recommend. Always scale the chassis with the driver sitting in it. Also, keep the same amount of fuel in the tank, unhook the shocks if you have a torsion car, and set the tire pressures to race ready levels.

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). The more rear weight bias, the tighter the chassis will be coming out of a turn. For the 600cc chassis, 61-68% works best. Calculate the cross bite by adding the RF and LR and dividing by the total weight of the chassis. Look for about 42%-48% in the 600cc. Increasing cross bite will tighten the chassis coming off the turn on small tracks. For winged racing too much cross weight will loosen the car the whole way around the turn due to overloading the LR and creating more LR than RR weight. If you're confused about this concept, read my "Rethink Dirt" paper in the tech department of this website.

Scaling the chassis can be useful in detecting binds in the chassis caused by bent or bad rod ends, bent shocks, bent axles, bent frames, or axles out of square. First scale the new chassis after the set-up procedure is complete and record all the numbers and the exact set up you used. Then, after each race, put the chassis back to that set-up and rescale the chassis and compare the numbers, if they are more than 4 pounds off (per corner), then something has changed.
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