Quote:
Originally Posted by rusty959
Im not sure why we would take bets on hp... with fi hp is related to how much boost, and how much boost is easily changed. However with this setup the limiting factor may be how much can be wrung out before too much knock etc becomes a problem.
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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.