Hi Mike,
With my setup, I have the water tank in the trunk, and the pump right next to the fuel pump controller (under backseat arm rest), with extra sound dampaning all over the under side of that panel, so the pump is lower than the tank etc.
I dont run a accumulator because the pump is in the back, so all the piping from the back to the front is basicly the accumulator (a good 2m-3m length in my case).
you could use a water flow meter (or 2 - the other pump) on the dash and keep an eye on it (prob the least you can do), I am planning of using a flow meter connected to my w/i controller so it will know if the flow drops from what It would normally be at that rpm/boost.
the 2 hsv sounds good, only other thing would be put a check valve(15 psi crack pressure) on the end of each nossle, this keeps good pressure (15 psi) in the line from the hsv to each nossle so your get a better spray at lower hsv duty cycles.
the 3d map stuff is ideal, so you can inject more at the high tourqe area's and more control over the injection, should get away with 1 output to drive them too as both sides should basicly be the same injection amount as long as the ecu can handle the 2 injectors on the same output line (should have load information in the documentation with ecu).
you really do want seperate fuel/timming maps for w/i running and not running. this is very ecu dependant. I do this with the stock ecu, but I have highly modded it, I use an external trigger - ie - a switch at the moment, but soon also with low water flow/level detection.
Hope thats some help
Cheers
Ryan
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