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I sorta disagree with the statement about drag racing chassis and circle track being completely different. After all, roundy round is nothing more than two drag strips connected at each end. Both types of competitions try to do the same thing, race down the straights.
Heres what I have found:
Drive shaft torque in the counter clockwise rotation will want to pull up on the right rear because it attempts to take the whole axle with it. Even though the right rear is more loaded with weight the car, the car still want's to drive off the left rear causing the car to go right. How do you explain this? The axle will twist to the right side on launch, this loads the the right rear, the weight of the chassis will push the right rear down. You would think this would counteract the tendency to unevenly distribute the weight to one side or another but the key is, that with an open differential,(which circle trackers never use) the tire with the least amount of traction will get the most power, hence a 1/8 mile burnout. In this case your right, you would add a round of wedge or preload to the right rear to get the car to launch straight. However, the bags or screw jacks or whatever are intended to increase weight on the right rear to counteract the torque twisting of the drive shaft, assumes the rear end is located with some sort of leaf spring or coil over. But, if the rear is either a IRS or a four link, the transfer of weight doesn't happen the same. With a four link rear, the axle doesn't twist in the same direction as rotational torque of the drive shaft.
My knowledge was being applied to a different type of suspension. You can beat me if ya want
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