Thread: 3% CO on LM-1
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mark houghton mark houghton is offline
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Originally Posted by 911nut View Post
Adjusting the mixture screw changes how much of the slits on the control plunger are exposed in the control plunger barrel, which routes fuel to the distribution chambers. End result is that more or less fuel is is flowed to all injectors for a given deflection of the air flow plate.
Boy oh boy, has this topic been hashed out a zillion times before. For what it's worth, general consensus is that the mixture screw has only a small impact on AFR's across the band. Larger impacts are the result of WUR control pressure settings and ambient temperatures. If, for example, you're too lean at cruise or under boost, no amount of screwing in that mixture screw will solve the problem.

Set your CO%/AFR at idle using the screw, and set it at or near 3% for best idle to low end power response. Start there, listeng to and feel how she runs, and adjust as needed. So much also depends on how stock your motor is.
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 11-21-2009, 11:24 AM
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