Quote:
Originally Posted by mastertech86
there isnt a moment when the ecu is not in self learning mode, its always tuning. thats cause it has to take into account weather change, altitude, fuel grade usage, etc...ppl only disconnect the battery cause its a faster way of resetting all the tuning the ecu stored in its memory also known as learned values, but that being said this isnt always the best way to do things as i personally always like to see how the ecu is correcting its values based on mods i do but there are other times where doing the battery disconnect is the way to go.
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I always disconnect before adding a new modification so the ECU can learn fresh; problem is that (on the WRX anyways) it always learns back to stock or "safer" regardless, without a tune anyway.