Water/Methanol Injection FAQ

[pcampbell]

Random but I finally measured my water meth output at the nozzle.
I tried DO3, 4 and 5 nozzles with my old Snow 40220A pump, which is a 300 psi pump but I understand they turn it down to something like 200(?) psi from the factory. Either way it's at the factory setting.

So very simple, DO3 was 150ml a minute
DO4 was 200 ml a minute
DO5 was 250 ml a minute.

Honestly I'm not sure what the right size nozzle is. I was getting bogged down definitely with both #5 and also #4 if I recall right. I don't remember the full details of when I had it coming on initially. I'm using the 3 now but it seems too small on paper...

Any thoughts as to these flow rates?
Is there a guideline of water meth flow rate compared to fuel flow rate or air flow rate?

* Registered users of the site do not see these ads.

[pcampbell]

Any thoughts on max power we can do on 93 octane + say 50/50 water meth (I'm assuming a stock casting head EJ25 4 cylinder here and not revving to the moon)? Can we make 400, 450, 500? My guess is the limit is somewhere in the 400s . Thoughts?

[Homemade WRX]

Originally Posted by pcampbell

Any thoughts on max power we can do on 93 octane + say 50/50 water meth (I'm assuming a stock casting head EJ25 4 cylinder here and not revving to the moon)? Can we make 400, 450, 500? My guess is the limit is somewhere in the 400s . Thoughts?

I mean with a large enough turbo and enough revs....

Assuming you're on a respectable turbo, intercooler and good injectors; I'd say probably 450-500 assuming 7k redline and nothing fancy. Also depends on dyno.