I am trying to tune lately since I finally have pretty much everything the way it is supposed to be. Anyway, I get the a/f ratios just about right and then 2-3 pulls later, I am way rich again.

Here is a quick 2nd and 3rd gear pull:

4420 +6.5 4.2 103 20 00 rich +26.3 44.4 +23.7 -7.0 ECU. 3.3
4351 +5.1 4.1 106 60 00 rich -2.2 48.3 +16.0 -7.0 ECU. 3.3
4623 +10.6 4.4 105 80 00 rich +18.9 57.0 +14.5 -7.0 ECU. 3.4
4782 +16.1 4.4 104 90 00 rich +17.3 64.7 +14.1 -6.9 ECU. 3.5
4982 +19.6 4.5 105 100 00 rich +20.4 71.3 +14.5 -6.5 ECU. 3.7
5175 +20.4 4.6 104 100 00 rich +22.2 73.4 +14.5 -6.5 ECU. 3.7
5473 +21.4 4.7 104 100 00 rich +22.8 76.7 +14.5 -6.5 ECU. 3.7
5602 +21.4 4.7 104 100 00 rich +23.6 70.4 +14.5 -6.5 ECU. 3.7
5920 +21.4 4.7 105 100 00 rich +24.7 75.0 +14.5 -6.5 ECU. 3.9
6071 +21.6 4.8 102 100 00 rich +24.7 74.8 +14.8 -6.5 ECU. 3.9
6265 +21.2 4.9 110 100 00 rich +28.5 75.9 +15.5 -6.5 ECU. 4.0
6373 +21.8 4.7 103 100 00 rich +30.9 83.9 +15.5 -6.5 ECU. 3.8
5973 +18.8 4.4 0 80 00 rich +5.6 46.6 +22.5 -6.5 ECU. 3.1
5464 +13.5 4.1 104 30 00 rich +11.6 56.7 +22.5 -7.5 ECU. 3.4
4880 +11.6 4.5 111 30 00 rich +23.2 57.6 +20.9 -7.0 ECU. 3.4
4734 +9.2 4.3 104 60 00 rich +20.3 59.5 +15.7 -7.1 ECU. 3.5
4782 +11.6 4.5 105 80 00 rich +18.5 60.7 +14.5 -6.9 ECU. 3.5
4990 +17.4 4.7 110 100 00 rich +20.9 68.0 +14.3 -6.7 ECU. 3.6
4880 +19.0 4.6 105 100 00 rich +17.5 70.0 +14.5 -6.5 ECU. 3.5
5120 +21.8 4.9 114 100 00 rich +21.3 74.6 +14.5 -6.5 ECU. 3.6
5224 +22.9 4.8 109 100 00 rich +22.9 74.3 +14.5 -6.5 ECU. 3.8
5376 +22.5 4.6 105 100 00 rich +23.6 74.1 +14.5 -6.5 ECU. 3.7
5367 +22.7 4.7 105 100 00 rich +23.6 74.3 +14.5 -6.5 ECU. 3.7
5473 +21.2 4.8 107 90 00 rich +24.7 69.8 +14.5 -6.5 ECU. 3.7
5688 +21.0 4.7 105 100 00 rich +25.3 77.0 +14.5 -6.5 ECU. 4.0
5621 +21.4 4.8 108 100 00 rich +25.7 73.5 +14.5 -6.5 ECU. 3.7
5787 +21.4 4.7 104 100 00 rich +25.4 72.1 +14.5 -6.5 ECU. 3.7
5767 +16.3 4.2 0 50 00 rich +6.3 38.6 +22.5 -7.5 ECU. 3.0

I have never pulled 4.9V until I recently installed the APS inlet and I think that has something to do with the ratios.

Can anyone offer any suggestions?

Mod list is as follows:
2.5l with p&P 2.0l heads
TEC 50lb 8cm^2 turbo
APS Hard Inlet
FMIC
UTEC
Modded stock injectors
TurboXS 3" TBE
P&P Stock headers
Alky injection 50/50 mix - wasn't used during the pulls

I'm not a super-duper tuner or anything, but your pulls are short and seeing a lot of fluctuation in MAFv. I would do longer pulls and smooth out the tune if you continue to see waves.

Also, you could go to a larger MAF housing, but I wouldn't worry about it until you were consistently hitting 4.8-4.9 unless you want to drop the cash.

you should do a pull in 4th gear so boost becomes more constant, because with these pulls you may just be seeing a slight boost spike putting you at 4.9v

Eric

Well, my ebc is set to 22psi and the pull is somewhat inconsistent since the afrs go way rich and casue the car to hesitate slightly...almost bucking.