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Jeff Higgins Jeff Higgins is offline
Join Date: Mar 2004
Location: Higgs Field
Posts: 18,436
I'm sorry Marlon, I could have been a bit more clear. 12.5:1 to 13:1 is as lean as I will let it go under any load, at any RPM, at any throttle position. So, full throttle high RPM, part throttle going up a hill - no difference, I consider that my limit. In setting mine up under this parameter, I accepted the fact that under some conditions (low RPM full throttle), it would go a bit richer, like as rich as 10.5:1. This is, however, for an exceedingly brief instant, and it will only do this if I "allow" it to happen by being lazy on the gear shift.

Trailing throttle is a different story. Even though I have removed the decell cut off solenoid, I still see A/F ratios well over 18:1 when I am, say, coasting down a hill on the freeway or something. Just as soon as I even think about tickling the throttle, however, the A/F returns immediately to a proper range to be under load.
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
Old 09-24-2020, 05:10 PM
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