The rule of thumb is.....every 100 lbs is equal to .1 second and 1 mph at the drag strip.
So 500 lbs = .5 seconds and 5 mph
Another thing....every tenth knocked off the 60 foot time is anywhere from .15 - .2 on the other end.
Unfortunately....Contours do not launch well at all.
Another rule of thumb is every 10 wheel HP is equal to .1 and 1 mph.
