[vristang]

Also, some clarification is in order for how the computer "learns"

The computer is not creating new values in any of the fuel tables.

However, when the computer sees consitantly rich/lean readings from the O2s, a multiplier is created. This multiplier is commonly referred to as the KAMRF (Keep Alive Memory Reference).
The KAMRF is then multiplied against the injector pulsewidth that is calculated.
If a lean condition exists the KAMRF will increase to greater than 1. A KAMRF of 1.08 will increase the injector pulsewidth by 8%.
A KAMRF of .98 will decrease the injector pulsewidth by 2%.
A KAMRF of 1.00 will obviously make no change to the injector PW.

The only value that changes is the KAMRF.

A KAMRF is calculated for engine load and engine speed.
This means that the KAMRF for 1800rpm/20% load, will not necessarrily be the same as 2500rpm/25% load.

There is an upper limit of 12-15% (depending on who you ask). Beyond this point the computer cannot compensate for rich/lean conditions.
I suspect that with your friends air meter you are maxing out your KAMRFs, but still not hitting stoich.

jason