Like almost everyone these days I log AFRs. Well this weekend on my first weekend on my refreshed motor I had some really weird AFRs. Normally I set my AFRs to fall a little bit from 13 to 12.7-12.8 but this weekend I could not get them to be consistent lap to lap. The curve is usually the same shape but not the same level but after reviewing the data there are a few outliers where the curve started higher and then jumped down.
Things I know
1) This was my first race on this motor since the refresh and I changed a few things so I ran the AFM flat(ART tuned) rather than pointing down like I normally do.
2) My Fuel pressure seems steady at 43 psi(tested in garage, don't log it)
3) I have a FPR from advanced autosport and kept adding FP to be safe
4) I have not checked the fuel pump, sock or filter yet
5) Battery Voltage was a little low but above 13
6) Water temps in the 170-175, Intake temps 150ish(90F outside)
7) Timing was set to 14
8) Injectors have 10 weekends on them
9) Innovate LC-1, logged with Race Technology DL1, Free air calibrated and seems ok.
10) I have one ticking lifter that hasn't cleared yet.
Anyone seen this before?