In the automotive aftermarket, most of these factors are already pre-determined by the OEM's and cannot be changed. So parts are designed to increase one or maybe two of the characteristics, but the overall engine remains the same. Injectors, for example, in the automotive aftermarket are designed for horsepower and perhaps some for fuel economy, but most if not all are not trying to stay within a certain emission level. It is in the automotive aftermarket that differences in engines become truly apparent and making power out of them; we start to find hurdles or road blocks that must be dealt with before proceeding.
Over the years we have been watching and participating in this market and have learned quite a few things. This series of stories is meant to act as a basis for you to build upon, and by no means are the only way to 500, 750 or 1,000 horsepower. These are just good old-fashioned reliable methods.
Never is this more true than with the 7.3L Power Stroke engines. Even injectors of the same cc will yield different results with this engine. So lets start by explaining the differences within the 7.3L Power Stroke family.