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Just Say NO to .90 A/R exhaust housings on 6.7 Cummins....
and also, why not to put the 87mm turbine wheel option on a 467.7 sized turbo.
On our chassis dyno - a 6.7 Cummins with 100% overs and a 10mm CP3 with a 5Blade 468 / 83 / T-4 1.00 we see 750 to 800 range of power. This size charger is a 95 to 100 pound a minute turbo (glow tested withaT04 1.10 A/R exhaust housing).
On the car, 10 pounds per minute equals 100 hp of capability as a rule of thumb.
In the diesel application, from what we have experienced; it's closer to 10.5 to 11 lbs. per 100 hp on a diesel (depending on the builds efficiency).
15% for drive train losses. The math says you will be about right at 770 to 800 hoursepower at the tire max effort. Keep in mind, some dyno calibrations are a bit more generious