Can 6000 watt electric motor power a car?

Well 1 horsepower is about 750 watts so 6000 watts is 8 horsepower. If you had 8 horsepower running to each of the four wheels ( 24,000 watts ) in direct drive with no efficiency loss do to transmission gearing and removed the engine and transmission then you be able to drive a light weight body like a geo metro. Also the type of engine you are using would be important for a car you should really look at 3 phase ac induction so you would be able to climb hills. Car hub motors are starting to enter the market they have the motor inside the rim and I have been seeing those at 8 hp at 899+. 1 company actually makes 160 hp hub motors for cars. but those cost 10k + each