I played around in another thread with mathematically determining where a car should be time wise on 1/4 mile run. I had a chance to drive this car myself giving me more information than you normally have on a car you have yet to buy. As I thought more deeply about my calculations, I became interested in estimating characteristics of a car modified to a new engine that I can not drive based on data commonly available about all vehicles. I'll make a new post for each step I take on this endeavor. I have a feeling it will take days.