so are you saying on a NA engine, leave water injection alone? or would i be wasting my time?
untill now i've been concentration on the wai,
here's a picture of the new setup
the airbox has a vacuum opperated valve that toggles between wai and cai intake, but only at startup, so i think there's a thermostat somewhere in the throttle body where the vacuum hooks up.
i initially used a pvc tube to hold open the WAI valve but it melted and got distorted so the valve closed again. this new version is made from aluminium, but it's also makes for more opening than before, wich hurts acceleration, so prehaps i have to scale it down a bit. ideally i'd like to retain the throttle link trough the engine vacuum the the wai would close gradually under increased throttle pressure.
on the other hand this setup opens both intakes so should reduce intake restriction also.