Getting started on my MAF Scaling

When I first plugged in the stock Sti ecu to my WRX, I was constantly getting the error code P0171 (System Too Lean). %he main reason for this is that my MAF scaling table was way off.

I read on the Net that the WRX stock intake is 65mm. Since the APS CAI is 70mm, this works out to an increase of 1.1 (70/65 = 1.1). So what I did was to increase the MAFv scale by 1.1 from the stock values.

Having dones this, I did my first log using williaty's method and here are the final corrections I got:

MAFv Mean Mode
0.94, ,
0.98, 16.41 ,
1.02, 14.26 ,
1.05, 15.31 ,
1.09, 15.14 , 18.75
1.13, 18.01 , 19.53
1.17, 18.54 , 16.4
1.21, 18.69 , 19.53
1.25, 18.52 , 18.75
1.29, 17.59 , 18.75
1.33, 16.79 , 17.18
1.37, 17.50 , 17.96
1.41, 16.42 , 17.96
1.48, 8.725 , 6.25
1.56, 12.54 , 11.72
1.64, 12.60 , 9.37
1.72, 13.98 , 13.28
1.8 , 17.77 , 18.75
1.88, 20.20 , 18.75
1.95, 20.78 , 22.65
2.03, 19.87 , 19.53
2.11, 17.26 , 14.84
2.19, 16.63 , 16.4
2.27, 13.91 , 12.5
2.34, 12.49 , 12.5
2.42, 10.47 , 9.37

As you can see, at this point, my MAF table is still way off (corrections are mostly > 15%).

Luckily someone (airboy) on nasioc pointed me to someone who has a similar intake and has the calibration data: http://www.iwsti.com/forums/cobb-street-tuner/54421-aps-70mm-cai-intake-calibration.html

I compared my corrections with the calibration data in that link that I found that I'm not that far off, so I guess I am doing ok. in fact, after a reflash with the new corrections and the car runs much better, hardly any P0171.

Here's a screenshot of my calibrations up to 9 iterations I did using williaty's method: