Edelbrock Pro-Tuner, User Manual

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the indicator is below the green band, it indicates that the system is "taking out" airflow
and the values in the map are too high. The
LEARN / LEARN INACTIVE LED will light
when the ECU is actively adapting.
Typically, adaptation will take several minutes to "hone in" at different steady state loads
and speeds before it is complete. (You can let the system adapt it out, or manually
change the VE map to bring the error down.) The system will only adapt when the engine
is in a steady state operating condition. This provides the most accurate adaptation and
eliminates error due to excessive MAF tube length. Many cells of the VE map may never
be 100% adapted since they are loads and speeds that are very seldom reached in "real
world" situations; or do so only for a moment. (i.e. high RPM with no load or very low
RPM with very high load). Very often you end up with a "football" shaped area of
adaptation, since that's where the engine spends almost all of its time during normal
operation. This is why a VE map should be manually smoothed with reasonable values in
the corners and overall map if the MAF sensor is going to be removed after initial tuning,
and even if it will remain on the engine permanently. If the MAF sensor is kept on engine
and enabled; VE adaptation will continue indefinitely.