I see a lot of pros quoting numbers similar to this. I used to run 11.5AFR with about 22* timing; the leaner tune with less timing seems to be making a LOT more power. Which makes perfect sense to me.[quote]

There's a 10 page post on tuners on water vs meth.. And the rep from devils own was in discussion. By the end he actually convinced himself that water/alcohol was a better choice.

I've always believed that if your just running a ton of boost and power on a built engine.. Where the engine isn't the limit , then meth is a better choice. It raises the octane level to suppress knock so you can run more timing and boost.

Water injection is more for running your engine past its limit. Eliminating knock so you can run way more boost and then tune for max power.

I think this is why people say max your tune out before you add meth. But with water.. You just add water and then raise boost and tune the car.

I'm more comfortable with water.. And I don't think I'll need more fuel any way. Not planning on making more then 32psi on my stock block.

Keep in mind.. Paul's car makes about 700hp

http://www.dsmtuners.com/threads/ask-your-water-alcohol-injection-questions-here.256772/

This is the circuit I made. I ran a wire off the pump side of the over pressure switch. This wire runs to a pressure switch by the nozzle with an inline dash light. When the nozzle sees 35psi+ fluid pressure the pressure switch turns on the light. If not enough pressure, the light doesn't turn on.

So if there is too much pressure, the pump shuts off and so does the light.

Then I have a relay inline this circuit, that activates the idle switch pin. This switches to Aux maps.

So when egr turns on water injection. The fail safe wire activates the dash light and the aux map.

So if nozzle clogs. Light goes out.. Switches to base map..

Hose comes undone.. Light goes out Switches to base map

Run tank empty.. Light goes out Switches to base map.



So far it works well.. But I stripped the threads in my check valve so it's on hold till spring. I was running 7g nozzle .. 5 parts water 2 parts meth. Didn't seem to effect the a/f but dropped temps everywhere and eliminated knock at 25psi and 14°timing.