As someone put it on here before:
40% driver
60% car
or is it the other way around? Its all down to how badly you punish your car on a 1/4 mile drag race anyway. I was really literally obliterating my car yesterday racing a modded 3-series BMW (white leather interior) maybe a 328 or something, but it wasnt slow. I had to resort to full-throttle gear changes to pull away from the bugger and only really managed to in 5th gear, although - it was in gear acceleration and not from a standstill - id have done better racing from slower speeds, i.e. 2nd gear from 3000 rpm upwards. Still toasted him and he flashed me and i did a hazards acknowledgement etc. I think he was trying to impress his girlfriend - no nooky for him then!