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Physics 101, Fluids 101, and Thermo 101

Aerodynamic drag increases as frontal cross section increases, as drag coefficient (a measure of the vehicle's aerodynamic "slickness") increases, or as the SQUARE of the velocity increases.

Horsepower is a measurement of power (the rate of doing work.) Work is a measurement of energy expended (a force applied over a distance.) Torque is a essentially a measurement of force (how hard the engine can turn the tranny output shaft.)

Horsepower and torque are not directly related. If they were related mathmatically, it would be apparent on dyno curves.

So...

A vehicle's top speed is limited by where the horsepower, torque, and drag curves all cross.
 
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