The original section was meant to discuss mixtures of water with other coolants like methanol. I am moving to a better matched section.
That is quite a bit of water from a static flow potential system, to use for a layer of det suppression safety. You may find that it bogs your engine down without some additional fuel or timing work.
A static flow system will inject more water per intake stroke at the point that it engages than it does at redline. And the differential in water weight per intake stroke is greater than the higher load the engine is under in the midrange.
To address this without complicating your system I would consider a smaller jet if you aren't planning on tuning your fuel leaner than you are considering. 5gph is about as much as I would consider based on your discussion so far.
I would look to start the injection at about 10 psi.
Your engine will bog at the lower end of the range will likely bog down some. Advance the timing a degree or two in the lower range first. Then reduce fueling until the engine no longer bogs down at the lower end.
Work your way up the rpm range in this manner.
I wouldn't be surprised if your fueling looks something along the lines of 12.5:1 at the point of engagement tapering down 11.5:1 at red line.
If you only reduce fuel to the point where it is not bogging down any longer you should still be a far way from det. With det cans you would likely find you could lean out a another half point of AFR even and get some more power prior to hearing any det.
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