General > Naturally Aspirated Tuning

NA m5x AFRs

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ding:
Just looking to get an idea of what people are seeing at idle.  I've seemed to get my idle under control, and I have my m52 with 21s and a 3.5 maf up and running but I'm seeing around 17.0 afr at warmed up idle.   I was running super rich with a turner chip and my 3.0 maf, but my maf might have been bad.

bmwstudent:
When I first installed my new exhaust I had a small leak near the wide band sensor and it was causing me to have a lean reading just off idle. I fit a new clamp at the leaking joint and the problem went away. Not sure if this could be your issue but I was surprised to see that much of a change from just a leak at the header collector( my sensor is just in front of the leak 2-3"). But if it's an accurate reading I would be worried, 17.0, that's pretty lean.

millerperformance:
17 at idle is not a big deal unless you can feel, or hear the car struggling. turn your O2 sensor off and see where AFR goes naturally. A bad O2 sensor and or O2 sensor heater relay can cause strange issues.

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