Philip
As your engine is using a Paxton supercharger boost is about the only trigger you need for activation. Boost will come on consistant with rpm. If you are only going to use 6psi turn water flow on at 2psi increase water flow propotional to fuel.
On a 3.5 liter engine with 6psi boost the normal jet size is 0.7 to 0.8 when increaseing boost to 10-11psi you may have to use two 0.8's and enough flow to keep up. You should alway make sure your system can put too much in. If it can not make the car stumble there is not enough water volume for proper tuning. All pump lose flow with time so make sure it is over built.
One of the great advantages of water injection is you can get very aggresive with the timing at 6psi. You should not have to retard but one or two degrees from stock if things are tuned correctly
One method of tuning is to not use water. get your fuel map and timing correct for the setup, then add water and increase timing.
Increasing timing will show a slight increase in O2 reading.
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Brad
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