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I have an Impreza Wagon Rally Car which has an AlcaTek ECU running Anti-Lag & Launch Control.
I use a latching switch to activate the Launch Control and unless I physically depress the switch after launching, the car is locked in 4WD. I only discovered this after fitting a DCCD Gearbox and Diff Controller and noticed that all the lights remain illuminated.
I thought that Launch Control was de-activated after a certain speed, As far as I am aware, a Momentary Latching Switch will not activate the Launch Control system.