That is very true. Just remember that the 6.9/7.3 has a 21.5 to 1 compression ratio. Too much boost will lift the head, blow a head gasket, and/or cause other damage to the rotation assembly. These motors are not made to handle 30lb of boost, that's why they (at least mine) have waste gates, or turbos made to only produce so much boost (because of the area of the exhaust and compressor wheel).
To truely boost these engines, you realy must use lower compression and turbo ready pistons and rods. That's why Cummins can be boosted beyound belief, low compression, and (have you ever seen the size of a Cummins pistion, rod and crank, holy crap, the crank weighs 150lb's by itself) and monster built rods, pistons, and crank. Even above 50lb's Cummins must use larger head bolts, and sometime ring the heads, but the stock rods, pistons, and crank can handle over 1000hp/1000lb's of torque. No other light truck diesel engine can claim that.
Marq
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1990 Ford F-250 4X4:
7.3 IDI with 120K on the clock:
ATS Turbo with waste gate:
Stage One Injectors (Oregon Injector Service):
Complete Return Fuel Kit (Oregon Injector Service):
DB2 Pump, cranked up with Cold Advance wired permanently on:
4” down pipe, 4” straight through exhaust stopping between cab and bed (no **** on my stuff):
Torque Converter Lock Up Switch (On/Off/Lock-Up):
E4OD Line Pressure Controller (adjusted to fast/firm shifts):
4” lift w/Rancho shocks:
Big Fat Tires on custom rims:
Tows 1985 fully loaded heavy 28 foot RV (my house) everywhere: