Hi,
Im using a megasquirt ECU, it can be programed to have one driver output that controls the fuel injectors and the other to control water injection, fully mappable for both. Im actually using both outputs to control 2 sets of fuel injectors in sequential mode. Im reprogramming the ecu to switch on water at set points, i.e. boost, Manifold air temp, revs. There are many people reprogramming this system for specialist applications and im sure that one of them would suit your needs. It cost me under ?300 to build including a wideband lambda sensor,
Phil
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