Quote Originally Posted by Chavy View Post
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