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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
Posts: 3,849
Quote:
Originally Posted by wwest View Post

Improve the MPG...??

Wire the turbo wastegate(s) wide open and mill the heads to get the CR of a N/A engine.
Hey now, there's a concept I never considered....a simple conversion back to a N/A engine! Who needs a stinkin' turbo gas-guzzler anyway.

I will add this: Properly tuned with some supportive add-on gizzmos, a person can get 20mpg just tooling down the road. If mileage under those mild conditions is crap, look somewhere else (such as state of tune, AFR's and/or driving habits).

As to plugs, NGK are a fine choice but the Iridium version I think isn't so friendly with forced induction (I don't know that for a fact, just thought I had read that somewhere). I use NGK racing plugs R5671A-8 gapped to .040 with MSD ignition. Work fine for me. Plus, I have my ignition timing way advanced over stock and run AFR's at about 14.2 steady state down the road. Both help me obtain decent mpg.
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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 08-31-2010, 10:50 AM
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