How much boost can i push safely with stock twins with 850's 850's crate motor. kinda newb question i know.

 

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14 psi and thats pushing it (the turbo's reliability)

thewird

 

so even with new 99spec turbos is what i was told, not rebuilt only 14 pounds?

 

There's not much difference between 93 and 99 turbo's, they're just a little more effiecient but not much. BNR's were actually designed to run higher boost. However, since the 99's were designed with taking a little more boost maybe 15 PSi? Anyone else have some input?

thewird

 

Even with new turbos, 14psi is pushing it, they just don't flow enough air. Also, 14psi is pushing it for pump gas too, unless you combat that somehow.

 

Dont waste your money on 99 turbos, no one has proven they make any significant difference to this date. If you are upgrading go with the BNRs as they are the only ones worth the coin.

 

14 PSi is perfectly fine for pump gas, even 91 octane.

thewird