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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
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Originally Posted by turbobrat930 View Post
I agree, compressor surge is a bad thing...... but the 930 does this in stock form, and vents the metered air back in before the the air is still metered.
You are correct. Venting that already metered air to atmosphere in a CIS fueled system will cause pig rich conditions when shifting. With EFI, not an issue.

With that said, many of us are using the updated BOV's in place of the recirculation valve that comes stock with CIS 930's, but we're still plumbing the boost air charge back to the front of the turbo so as not to generate the pig richies.
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 03-02-2010, 06:25 PM
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