How does a water injection system work?
The system is powered by a 100-psi high-volume water pump that is triggered by a pressure switch attached to the intake manifold. It can be set to activate from just over 0-psi to over 10 psi (3 psi is a good point). Once activated, the system pulls water from the windshield washer tank using an adapter supplied in the kit and injects it through a stainless nozzle which is usually installed in the intake (supercharger) elbow (about 6 inches before the throttle body). Higher end systems have their own water tank, some of which are pressurized. The nozzle is a precision device which meters the water in gallons per hour. It resembles a 1/2 inch ball bearing cut in half with a hole in it. A 12 or gal/hr nozzle should be sufficient for most applications, but a 15 gal/hr is good for higher boost levels. The water comes out under very high pressure as a fine mist in a conical shape, and is immediately pushed into the engine by the output of the supercharger. In the tank is a mixture of distil
