Snowman,
Torque is what moves the (weight) car, it can be measured, HP is just a calculation of torque x engine speed.
If your torque is in the lower RPM range (max. boost) then you need to gear the car higher to use the torque made at that point of time.
A turbo has a flat torque curve and allows the engine to flow more air and makes it think it has a larger intake port therefore turning more RPM.
Harry
