Mystery, I'm running stock injectors (top DC about 75%) and after I installed my cam, and altered the BLM cell boundries to fit the new RPM/MAP. I found using Datamaster Histogram for a few logging cycles that my lower engine load , BLM cells 0-4 were on the pink (richer) side and as I moved up in engine load the cells went white (normal) then moved towards the green (lean) to where cell 15 was averaging low 130's. BLM cell 16 was almost red in the 115's. Since I was not rich OR lean across the board, I ruled out fueling (pump/injectors), O2's or a sensor failure. I agree w/you, I would not recommend changing MAF or cylinder trims if BLM cells are consistent is one direction. That's usually fixed by a general fueling management adjustment. In my case I dropped the individual cylinder fuel trim multipliers for idle a couple of percent for all cylinders, and dropped the off idle trims (3%-14.7% TPS) a bit less. Then added a percent or so to the high AFGS MAF table. Re-logged and then additionally dropped low AFGS MAF table cells just a little bit on the pink cells. Back then I was trying to understand why the cam and RR's caused it.. somehow the burn got dirtier at the low end and more efficient at the higher end. I'm running stock heads, so maybe there's was not ample air flow at the higher MAP, my idle is 700 RPM, MAP around 49. Or could be the burn efficiency at low end changed w/the increased cam overlap (214/228 112 LSA). Been meaning to do a VE tune some day, to see how far off it is, but it's low in my priorities right now, probably get bitten if my MAS dies on me some day and PCM reverts to SD. That's a reason I stated to OP, if anyone loaded my tune they would probably run crappier than before they started.
I'm Bob.. 1994 Z28, A4, Stall, CAI, Cam, RR's, 342 rear, LT's , CatBack, Tuned
Last edited by bobdec; 12-05-2012 at 04:07 PM.