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After the next project
 
x98boardwell's Avatar
 
Join Date: Sep 2006
Location: Central Valley, CA
Posts: 1,522
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Idle Mixture

Brian,

When you say idle mixture... are you referring to the DWUR or is there another adjustment on all cars for that?

I realize their is a basic mixture next to the fuel distributor with an allen wrench but if someone were to adjust, the O2 sensor should auto adjust it back to compensate... correct? Just wanted to know what you were referring to and if normal (old style WUR) cars could change that mixture curve at all.

Someone said I could lightly tap on the fuel distributor where Leask makes it adjustable but I was never sure what that would do and if it went to far then I have to take it apart.

Thanks,
Bryan
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Previous cars:
2007 GT3, 2006 Cayenne TTS, 1991 928 S4, 1987 930, 1975 914 2.0, 1989 944 Turbo S, 1991 964 Targa, 1991 964 Convert, 2004 996TT Convertible, 550-6 Spyder with a 2.4 liter twin plug "S-spec'd motor"
Current cars: 2012 Cayenne TT, 1997 993TT, 1984 Jeep Grand Wagoneer, 94' 928 GTS, VW GTI
Old 03-11-2010, 06:41 AM
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Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
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Yes I was referring to the idle fuel mixture adjustment located on the air meter assembly by the fuel head. No Lambda controls as those are disabled and CO adjusted to 3%. That CO level will change of course as you move toward 14:1 AFR at idle. Good place to start.
I have not kept up with the Digi-WUR thread so don't know exactly how this version works. I think it is safe to assume that idle mixture is still controlled by the fuel head which would set the baseline for the entire fuel curve. This needs to be confirmed by the dig-WUR folks of course.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 03-11-2010, 10:54 AM
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cycling has-been
 
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Join Date: Sep 2004
Location: Jersey Shore
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cool..... so I'm not the only one who gets grease on their pajamas
bill k
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Old 03-12-2010, 12:20 PM
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