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Old 12-20-2009, 02:17 PM   #1
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Default Drifting Idle AFRs

I am having an interesting issue. When I start my car, the idle will be at maybe 15:1, then slowly gets richer to about the mid 13's, and after I beat on it a little, it will move all the way to the low 11's. Attached is a short datalog and my tune. Am I missing something here?

My setup: Stock Injectors, DIY MS1 Standalone, LC-1.
Attached Files
File Type: msq 2009-12-05_20.01.38.msq (31.8 KB, 94 views)
File Type: zip 2009-12-20_12.43.22.zip (176.6 KB, 46 views)
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Old 12-21-2009, 02:28 PM   #2
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I see you're idling at around 900 RPM and 25 kPa. Try making all four cells in that area the same value and see if that improves things.
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Old 12-22-2009, 09:45 PM   #3
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Making the four cells around idle all the same helped a bit, but it did not completely solve the issue. I think part of the issue at this point is IAT heatsoak. Idling with tuner studio open, I saw the MAT rise to over 130F, on a 60F day. This car still has the stock airbox & sensor.

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