Quote:
Originally Posted by Coheed
hp is related to mass flow rate, not boost. a slightly larger turbo will make more hp on a given psi.
larger turbos have better flow characteristics and provide higher VE and scavenging. All with less retained heat, lower intake temps, and less tendency for knock in most cases.
A knock limit on a GT25 may be 6psi, but upgrade to a GT30r and you may find that 8-10psi is safe.
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Yes, but that isn't the point of what I said. Setup A set to 3 psi makes X hp. Setup A set to 6 psi makes Y hp. In basically any case assuming good tunes, 6 psi on setup A will make more power than 3.
So to a point there is reason to spout off hp guesses, because obviously there is a limit to how far we can push this engine in reasonably stock form. But, shift what you consider a reasonable safety of margin, up the boost a hair, and you are making a different level of hp.