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					Originally Posted by Adam
					
				 Drag racers have a rule of thumb I've heard a few times.  A 100lb loss is =  to 10 hp gain on an average passenger automobile.  Either one resulting in approximately a .1 sec improvement in a 1/4 mile run. 10lbs isn't very significant at all and would be roughly equivalent to 1 hp in terms of acceleration. | 
	
 
Probably pretty accurate.  The good news is losing weight also improves braking distance, grip levels, cornering speeds, and suspension movement.  On a tight road course 100 lbs weight loss might be worth 1/2 sec.  Your mileage may vary.