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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,255
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Thing is; rich is rich, and 11:1 is drowning in gas rich. This is why it has to be an anomaly reading. The idle should oscillate at that level. I also set the idle by ear then check the AFR as a reference. Idle mixture directly affects the entire operating range so if the mixture is 14.5:1 at cruise it is unlikely to actually be 11:1 at idle. The typical range I see is 12:1 on the low end and 13.5:1 on the high end. Either way the engine does have a sweet spot at idle and that is where it should be set.
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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 07-24-2017, 05:39 PM
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