| have noticed that my AF is lean until 3500 rpms then it fattens up and smoothes out from there under higher boost and rpms. This is with stock turbos and injectors as well as with Nismo 555's and GMS 550 turbos. Seems as though I have seen other dynos here with similar AF charts as well. This was all with a tailpipe sniffer, I know closer to the exhaust manifold is more accurate. I have probably dynoed my car 9 or 10 times with similar charts. The big difference between a sheet I am looking at and yours is I am 11.5 to 1 by 4500 and you don't seem to get to a safe spot until close to 6000 rpm. What was your base timing? Did you listen for detonation? I know some dynos will have headphones that will cancel out other noises and make it easier to pick up the sound of detonation try that next time as well.
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