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personaly id start with 10-12 and take it from there
engines are alot more finiky when u give em more and more boost, tuning is an art there, also an engine will make the most power right before it blows up. so take that in and chew on it..
see im stupid and dont know what the best thing is i still run stock managment but dont take after me i have been doing this for a few years now, there are tricks that only time will teach you.
so the engine (obviously if tuned properly) will take 15 psi?
Can i run anymore or should i run less?
a stock b18c can take 300-350whp regardless of psi as different size turbo's will push different amounts of cfm. even if it take 20psi to make those numbers.