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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
Posts: 3,899
I'm still scratching my head - waiting for an ah-ha moment - that clearly points to your boost issue (which seems to mysteriously have gone away). Assuming no plumbing leaks and validated WG functioning correctly and no issues with the turbo itself, a zero boost condition points to the boost recirulation valve maybe sticking open. Did you ever pull it apart? (spring loaded piston that's built in to the left side of the secondary intake manifold which sits on top of the primary intake manifold). Fueling can cause low boost, but zero boost...probably not without other symptoms showing up.

Anyway, to your question. If you do indeed have a "special" turbo, hang on to it with your life! To realize it's full potential, yes an aftermarket larger IC is called for. You'll end up with a colder, denser air charge which equates to reduced chances of detonation and more HP. You will notice the difference.

Shop around a bit for IC's. You can go with a short neck that will bolt right up with no modifications, or go with a long neck that allows you to remove the boost recirculation manifold for weight reduction and faster spool-up of the turbo, but this does require a couple other things (like a BOV and 964 elbow to mount it to).

Used IC's can usually be had for around $750 to $1000, new are probably in the $1500 range. Good performance investment that along with a good turbo and free-flowing exhaust will make a huge difference in performance.
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 04-14-2012, 06:27 AM
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