Well, of course, it is not “’nuff said”.
Boost is not the deciding factor. Mass airflow is. Boost is, to some degree, an arbitrary number. So, it is dangerous to give advice based on this incomplete snapshot. 15 PSI is a totally different animal depending on if it is coming out of a T-3 or a GT3788r. Plenty of motors have gone to pieces at 9 PSI on a small turbo. - Jeff Abrams - <mailto:[email protected]> [email protected] - www.mazdamaniac.com From: [email protected] [mailto:[email protected]] Sent: Tuesday, July 27, 2010 9:48 PM To: Jeff Abrams Cc: [email protected] Subject: RE: Stock 1.6l w/FM2 kit, mechanical limits with regard to boost and advance? i dont build or race miata's, but I did have a turbo 1.6 with the "prehistoric package" of j&s knock guard, afpr etc. and got it to 11.5psi boost (117psi rail pressure) at normal timing because the knock guard pulled timing so fast at the high det rpms, it worked. i should have never touched that car after that. it was quick and reliable. but because of the J&S, detonation was hardly a factor. i had a turbo'd miata friend coming to my house whose piston broke due to detonation he didnt hear. from all the discussion over the almost 15 years i have followed this, 15psi is where it gets dicey. things start happening fast, and tuning is trickier. maybe its not science and maybe you dont like the order that i assemble my words, and hey if you get a chuckle, no charge. but i maintain that you need to be careful when applying a turbocharger anyway. and after the mid teens on boost, with these engines, you need to get real careful. my advice to a noob would be to inch your way up like I did, and think about risk/return after 14-15 psi. nuff said
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