[scottj]

The formula is this simple: Build as much torque as possible in the rpm range you intend to run.

But...

400 lb/ft average torque from 2500-4500 rpm will not accelerate as quickly as 400 lb/ft average torque from 5500-7500 rpm.

If rpm range is not a concern, then the higher an rpm you can make a given amount of torque the faster you will accelerate.

The problem is, rpm is always a concern... which takes me back to my opening statement