It's completely normal. The engine is not even under any load.
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This is a discussion on Stage 2 AFR Question within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I just tuned my 2011 wrx to stage 2 and I am concerned that it is running too lean at ...
I just tuned my 2011 wrx to stage 2 and I am concerned that it is running too lean at idle. I have noticed that when I put the clutch in and the engine is idling as I am rolling (at approx 2k rpm), the air fuel ratio is a constant 20.4. As the rpms drop to about 700 the AFR drops to around 14.5 but it pauses at 20.4 for a few seconds before dropping. Is this cause for concern having the AFR so lean? It seems to be ok at other areas from what I can tell. The mods that I have are Cobb SF intake, Invidia catted downpipe, and Nameless Performance muffler delete. I am running the stage 2+ low wastegate OTS map. I am noob when it comes to data logging and monitoring so sorry if this is a dumb question. Any input would be greatly appreciated.