What is the relationship between a car's horse power, torque, weight and speed? After some some searching and experimenting I found some pages that gave bits and pieces (I found one I really like and am linking to it below). While there is no substitute for an actual road test, this formula seems to work pretty well for figuring out the the quarter mile time and how fast it'll be going: Speed at 1/4 mile point  = 220 * (HP / Weight) ^.3138 Quarter Mile time = 6.9446 X (weig...