[Hog]

Just some general observations about the last couple pages

After a few burnouts all these numbers go out the window, esp. on soft tires. Then factor in tire growth due to the centripetal/centrifugal force changes at speed, tire pressure while driving, the effects of wheel alignment on tire heating, type of gas the tire is inflated, plus the manufacturing tolerances of the tires themselves, even tread squirm could be thrown into the convo.

This why there is a "fudge factor" built into any modern ABS or stability system. Accuracy has its place.

IMO If you are going to go through the trouble of a ring/pinion change, you might as well make it worthwhile.

The usual course of engine modification will move the power/torque corves to the right oi the graph, with highly modified engine making less torque at lower rpms. This would necessitate lower gearing to allow for driving below the torque.
More power=more revs(N/A)=more gear (all else equal)