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it can also learn shift times slightly. driving the car really hard after resetting tunes the shift to change a lil later in the rev range and vice versa
You don't need to reset the ECU or have a tune to alter shift points - just press the power button and that delays the shifts same as a tune.
The power button doesnt have the same effect as a tune. If so, why would people be wasting money on getting their car tuned? When you get a tune it makes the car have a bit more grunt and also delays the shifts..The power button only delays the shifts and gives a little bit more power. Does not do the same thing as a tune though.
I've always been told that after you do the reset, start the car and hold it at 3000rpm for the first 8 seconds so it can do the air/fuel mixture calculation.