With said pump, is there a controller as well? Is there a voltage regulator to feed the pump or will the output vary with system voltages? Does the system require a pressure regulator of any kind? What calculations are you using/will you use to establish flow volume & pressure?

I am interested in H2O injection as well in FL for the same reasons. A DIY kit is well worth the R&D.

From the MS Manual:

http://msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual.htm#waterinj

When the manifold boost level (detected by the MAP sensor) and engine RPM are above the set values in Megatune and the Manifold Air Temperature is above the set value, the Pump is turned on via X2 for a V2.2 pcb or JS0 for a V3 pcb. X3 (JS1 for a V3 pcb) is pulsed at the same rate as injector CH #2 (this can be used to drive a fast acting solenoid). The theory being that if a water nozzle is selected to give a 15% flow rate of the total of the injectors flow rate then it follows that it should naturally give the right amount of water. So if your total injector flow is 2000cc/min (all of your injector flow rates added together) then a 300cc/min nozzle would give you 15% water to fuel ratio, which is a good starting point. i.e. 15% of 2000cc of fuel = 300cc of water.
The Manifold Air Temp is ignored once the water has turned on as this should reduce vertually straight away with the water evaperating in the air. The water system doesn't turn off again untill boost pressure or RPM has dropped below the set levels.

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2012 2500HD LML