The ’97 put down 420 hp at 2,850 rpm and 788 lb-ft at 2,750 rpm. The reason for the high-rpm torque peak is fuel-based:
For bottom-end safety, a lot of fuel was pulled back via tuning. A more progressive fueling curve leads to a more progressive torque curve. Lots of low rpm torque and cylinder pressure can kill a stock 7.3L’s short block.
This allowed me a good starting point, as the truck made 420 hp at just 30 psi of boost. With some more aggressive fueling and hitting 40 psi, who knows how much hp is left on the table. But we’re going to find out in the coming weeks. We’ve only scratched the surface of what the 238/80s are capable of…
-30 psi boost
-1,400* EGT peak (same as with the old Stage 1’s)
-Made 400 hp or better from 2,700 rpm to 3,200 rpm
-Made 700 lb-ft or better from 2,475 rpm to 3,100 rpm
*First and foremost however, a set of traction bars are needed. It was hard watching the axle wrap and seeing the pinion angle change so drastically back there.