Edelbrock 3670 User Manual - page 212

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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.