water/methanol cooling question

[Chavy]

Methanol stoich is 6.4 vs. gasoline at 14.7....so 11.1 on gasoline equals going rich whereas depending on how much meth is going in vs. gasoline....hard to say where the 11.1 lies (but probably not as bad as you are thinking). Bottom line you are adding for performance so whatever yields you that. I tune without the meth/water to pe of 11.5, then increase spark in adder table for cooler temps. I don't worry with the resulting AFR during injection unless it goes lean since I don't have a precise way to know what my new mixture is. Of course there maybe some experts herein that have some good ideas on that or other so I am all eyes. cheers

[1fastchevy]

Oh shit my head hurts now.


G/L

[jetmech]

Methanol stoich is 6.4 vs. gasoline at 14.7....so 11.1 on gasoline equals going rich whereas depending on how much meth is going in vs. gasoline....hard to say where the 11.1 lies (but probably not as bad as you are thinking). Bottom line you are adding for performance so whatever yields you that. I tune without the meth/water to pe of 11.5, then increase spark in adder table for cooler temps. I don't worry with the resulting AFR during injection unless it goes lean since I don't have a precise way to know what my new mixture is. Of course there maybe some experts herein that have some good ideas on that or other so I am all eyes. cheers

Interesting. I'm still using the MAF's IAT sensor so my ecm isn't picking up the drop in temp from the water/meth. I know it would help to relocate the IAT after the meth nozzle but right now I'm only concerned with my AFR at 12ish pounds of boost. I understand what you are saying about the tuning and I agree. I did the same thing. I tuned without the meth, then switched it on. Although the stoich AFR for meth and gasoline are different, the wideband still gives you a pretty good idea of where the AFR is. To be honest tho, I'm just looking for cooling so for now, pure water will do the trick. Thanks for the input dude

[SCIV]

Doesn't the water vaporize? What happens to the oxygen molecule? So even water adds more oxygen, so it could lean the mixture?

[Chavy]

I believe in vaporization the strength of the Hydrogen bonds stablizes the molecular equation and maintains the two hydrogen to one oxygen atom ratio. And if for some reason the one oxygen atom was released there would be two hydrogen atoms now available for combustion, hydrogen being highly combustible and having high thermal conductive properties (and a mute point since it don't happen like that). In reality, the water vapor ends up going out your tailpipe and becoming condensate along the way as it does. IMO the engine stumbles on too much water due to other reasons (like drowning in water and not enough oxygen). The biggest risk I know of to lean in meth injection is if someone tuned an enrichment table for meth and then their meth failed.

[jetmech]

Well so far, I'm running really strong on pure water. I understand the chemistry of the situation but, again, I'm just looking for cooling. Besides, water/meth systems use high pressure and a nozzle with a very small orifice in order to spray a fine mist which helps vaporize the liquid quickly.