[philminotti]

Not sure how your system works, but with the FAST XFI 2.0 system, changing the AFR table does not directly change the actual AFR. If O2 correction is on, the ECU will attempt to adjust the VE table on the fly to try to match the actual AFR to the setting in the table. If O2 correction isn't on, the actual AFR is strictly a function of the VE table, not the AFR table. The ratio of the actual AFR to the table value at that operating point is the lambda value. Now, if learning is enabled, the ECU will not only try to make the actual AFR agree with the table, it will reprogram the VE table, thus saving the on-the-fly O2 corrections. For self learning to occur, O2 correction must be enabled and certain other parameters must be met. Remember, if O2 correction is disabled, changing the AFR table does exactly nothing to the actual AFR. That's the job of the VE table.