How much horsepower would a high performance car need to run the speed of sound arrive before the sound of its engine arrives? assuming 4514 lb curb weight assume no wind assume no driveline losses of vehicle travelling at the speed of sound (760 mph - 1116.4ft/sec) what you need to know: hp fsum x v/hp f drag 1/2 pv*2 cda f rolling resistance crr x weight f sum f drag +f rolling resistance cd .398 a 26.72 fta2 crr .015 p.002377 slugs/ft 3