Short report

It's a while now that I changed the IFR table and the tune is still OK.
LTFT change a little depending on wheater conditions (go a little positive when cold) but that's OK.
What I did was log for LTFT, fuel trim cell and MAP.
LTFT are averaged, MAP is rounded to the next MAP value in the IFT table.
I used only cells 0-19.
I then put LTFT ans MAP in a pivot table (Excel).
The result is a correction in % of the specific IFR value.

So far so good!
I used to tweak the MAF table but never with good results. At least not as good as only changing the IFT table.
A side effect of changing the MAF table is a wrong G/cyl value which affect timing also!!!
I used to reduce the MAF values to adjust fueling: less G/sec means less G/cyl and in general higher timing than necessary (PING!)

Here the actual IFR curve: an untypical shape, but LTFT are now +/- 2% with an average of almost zero

Stefano