So for 600-650 RWHP, stock injectors, and stock bottom end, we are going to recommend turbo's capable of 800-900 RWHP?
To believe that you increase compressor size 12-15mm over stock, turbine size 21mm over stock, and increase rotating mass by the pounds and not add any additional fueling mods to offset it, will yield good results without serious sacrifice is ignorant. It is not opinion, its not magic, its not who builds better turbos, its science and math. You increase the size and rotating weight, but don't increase the energy to drive it, it will be slower to spool in every situation, especially under load, and will take longer to peak.
AUSDMAX: Pick a turbo for the power range you want to operate in. A stock fuel system, whether LB7, LLY, LBZ, or LMM is only going to supply enough mm3, cubes, or actual quantity of fuel for 575-625 RWHP, regardless if you have 63mm Turbo or a 83mm turbo. Diesels are simple they make power with fuel and air. With a limited amount of fuel (mm3) an excess of air, is not going to make more power. With a single, an excess of air do to an oversized turbo, will cost low end response, poor "lugging" characteristics under load, and a peak number at a higher less accessible RPM. The difference between a 63 & 83mm turbo is the shape of the curve vs rpm. TURBOS SHAPE CURVES, not tuning, not injectors. Its the turbos job to determine where and when you have power. A larger turbo WILL move the curve right on the graph, incrementally with size, pushing your "power band" further and further out of your normal RPM operating window. Its math not opinion! The bigger the turbo, the longer the delay, BUT the bigger the hit when it lites.
Caleb
