To better understand the effects of Relative Air Density on your engine's performance,
I highly recommend Richard
Shelquist's Denisty Altitude & Engine Tuning calculators.
If you assume 15-to-20% driveline efficiency losses, that would put the crank horsepower
@ 231-to-247 hp, or about a 2.5X increase in power and torque. A
fairly broad torque curve and relatively flat power band are present. Gear
changes at 5000 - 5200 RPM drop the engine speed into a range delivering
255+ ft-lb of torque at the wheels!
BTW, the dyno numbers came in
about 5-to-8% higher than I had expected, based on the calculations I had run
using the TurboFast -
TurboCalc from Ray Hall Turbocharging. More than likely the drivetrain
losses on the dyno are lower than 20% and/or the volumetric efficiency of the engine
is greater than 85%. BFSC is also likely to be below 0.50 lbs/hr. And remember
maximum boost was 11.9 PSI. Increasing boost pressure to a relatively conservative 14.7 PSI will provide an estimated additional
+20 bhp @ 4400 RPM on the dyno rollers.