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It's all in engine management, which will provide you w/ fuel management, proper timing, and tuning capability. From there the sky is the limit. If your trying to run your factory ecu w/ vafc "hack" I'd keep it around 7 psi.
Originally posted by ragerized i wouldnt go more than 5lbs on a stock engine. its all in building the engine up...
lies i've been running 8 daily for a whole freaking year and i'm fine. Just get to a dyno and make sure your A/F is good. I've known people to run 8-10 daily for over two years before any damage.