The only problem with a wide open throttle switch is you could potential hit WOT at say 2000rpms and you probably wouldnt want water spraying then.
But that is a good idea, I could make a contact switch that mounts to the throttle plate, although I still think that will be slow tho, the turbo reacts very quickly over 3000rpms.
I still think an electronic injector is the way to go... hmmm... I had a fifth injector on my last car, no reason that wouldnt work with water...
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