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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
Posts: 3,776

Why would it matter the plugs you use, whether EFI or stock CIS? Both systems are injecting controlled rates of fuel. EFI just gives you more accurate control under a broad range of conditons. If you've had good experiences with plugs prior to your EFI conversion, then stay with logical reason to change in my mind.

I used to use the W4CS...they were fine but maybe a touch cold for my liking. I have since switched to NGK race plugs R5671A7 (thought they were a little hot) and now am trying R5671A8 heat range. I like them just fine.
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, 01:43 PM
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