acctually horsepower = torque x (rpm/5250)
and the reason they made this horsepower caculation is ebcasue it measure the cars ability to accelrate the fastest wtih the right gearing. It does not factor in weight but a 2 cars that both weigh 2000lbs one wtih 200hp and 150 lbs torque the other with 150 hp and 200 blbs of torque if both were geared as best as possible the 200 hp car would win it is about the horsepower as long as gearing is tuned to it