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Could the lower torque be partly because you ran the bigger housing at the dyno? I do know that 6.2 and 6.5 Chevys do tend to have higher horsepower compared to torque when they are built up a bit too. Could it also be the cam profile maybe?

Plus more fuel will light that turbo quicker too which also could help mpg as well as power.

Heath Diesel sells a towing cam that would allow it to breathe even better down low. I just tend to think the stock cams can definitely be improved on. As far as adding more fuel, remember the mileage is controlled by your foot. You should be able to achieve 20mpg even with it turned up more IMO...

That's a decent amount of boost. Now all you need is some more fuel and some head studs. To push up power further. And maybe a cam swap. :D

Nice numbers. What is your max boost with the new housing now?

Hey you might call Ken over at Dps Performance. They are mounting Db4 pumps on Ford 6.9/7.3 trucks. Right now he is producing a 150cc pump that is pretty reliable as a daily driver. He also has a few 180cc pumps out too iirc. NMB2s idi had enough fuel to make 292/614 with the 150cc pump on an...