ecu fuel trim

[jondee86]

My ECU (Adaptronic) has a learn function that adjusts fuel in each cell
according to a target AFR table. Once it has "tuned" a reasonable number
of cells, I manually smooth any widely varying cells, and also fill in some
of the "un-tuned" cells = interpolation by eye Then, I use data logging
to verify that my auto-trim values are not excessive (running closed loop
with an LC-1).

If you only have open loop control, you will need to set up the high load,
high rpm part of your map on the rich side, and manually trim the cells
after data logging as you do now. FWIW with ITB's on my 16V I found that
the top end of the map is fairly planar. The bottom end had most of the dips
and ridges.

Cheers... jondee86