tried searching but cant get a good answer. my max boost is 15psi. I want to be safe and got all the water/meth setup. but not sure at what psi I should be to starting to spray. any input will be helpful.

 

single stage ? 5 psi is what would go with.. without over thinking it.
however i prefer a pwm system. it starts at 1 psi as dunno 2 ms? and ramps up with boost and rpm.

 

There's a lot of factors that determine when you want The water-methanol injection to stage in Example turbo size/ efficiency me Generally you want it where Or just before your highest temperatures Example If my Turbo starts to Begin to build a considerable amount of heat at 10 psi I'll on it on about 8 I've had a few customers car is where I had it come it in later around 12-15 .... Granted I didn't look but I'm only guessing that you're running a stock FC turbo in which case The HT 18 Gets really hot above 12 PSI I'd likely have a come in about 10psi If it's a true mix of water methanol than be prepared for it to run richer Based on the concentration of water and methanol

 

13bt s5, stock ports, gt35r, 720/1600cc,

 

You don't need to run water inj. on that turbo with that setup provided you stay below 15-18 psi. You can, as said above, have it come on with a fixed nozzle at 10 psi, or a PWM setup from 1-2 psi on up.

This really is not the section to be asking about this. There is an entire sub-forum about this.

Auxiliary Injection - RX7Club.com

 

Doesn't hurt as a safeguard and a steamcleaner. Its good for the engine. reduce combustion temps and housing warp, and safeguard against **** fuel. I have mine coming on early about 4-5psi. Its the older AEM controller and 330cc nozzle. If you've got it might as well use it.

 

^ all I want to hear. lol