I hope we’re not derailing the OPs thread but I run a Snow’s water/meth (50/50) injection system PWM controlled with a solid state relay from my ECU which allows me to ramp up the amount of WM as boost rises. I have a
#3 nozzle at the intake elbow (3GPH)
and #10 at the turbo housing. I turn on the spray at about 7psi and 40% duty cycle and ramp to 100% at about 14psi.