okay, did the dyno tuning on monday. they worked on the truck almost an entire day (from 6 am to 3:30 pm). I got exactly what I asked - lots of power at my cruising RPMs: between 1300 and 1400 RPM. I drove back from Toronto to Guelph, and this is not the same truck I drove from Guelph to Toronto
The increase doesn't look that much on paper, but they really put the joy back into the driving. I'm going back on the road on thursday and will report on how this extra horsepower will affect my fuel mileage.
Here's some technical info from the dyno report.
RPM 1,188; 1,419; 1,634; 1809;
Fuel GPH 21.2; 24.5; 25; 26.7;
Old HP 436; 509; 501; 501;
NEW HP 442; 547; 538; 540;
Wheel 1 400; 477; 452; 425; old HP at the wheels
WHEEL 2 405; 516; 462; 437; new HP at the wheels
I'll be crusing at 1325 rpm which according to a graph attached to the dyno report, should give me about 475 hp (450 at the wheels).
The truck has 2004 Cat C15 Acert (dual turbo), 3.73 rears, 18913 tranny, 2000 lb-ft torque LIPE clutch, low pro 295 yokohoma tires. 1325 RPM makes me cruise at 58 MPH.