Inconsistent a/f with emu - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-02-2008, 11:02 PM   #1
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Join Date: May 2007
Location: Auburn, CA
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Default Inconsistent a/f with emu

I have had a problem with inconsistent afr for a while. So I thought an O2 clamp might help. I installed an O2 clamp this weekend and gave it a try. See attached log.

Note: I'm using a Motorola MPX4250AP MAP sensor, but selecting GReddy. (16.5 Greddy = 2.60 Volts = 6.8 PSI).

For example, the A and B markers are about the same RPM and PSI, but the I/J duty cycle is 70.4 versus 73.8 and the AFR is 12.2 versus 11.3.
Is this something that an O2 clamp can fix if I just keep trying different clamp voltages, (current clamp voltage is 400 mV)? I can't make my I/J map richer to help the area around 757.60 sec, because it is already too rich at 765.60 sec. Any help would be much appreciated.

Hear is the .EM2 file,

Last edited by OldAndInTheWay; 01-02-2008 at 11:15 PM.
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