meth injection
 

I have been using meth injection for about 10 yrs know with good results.
Since I have changed over to EFI , the meth is not atomizing to vapor and is screwing up my TPMS sensor. Took it off and it is filled with water. I have the meth injector on the out pipe of the intercooler right above the throttle body. I was thinking of moving it to the intake pipe of the intercooler , so it has a little more time to turn to vapor. What do you meth guys think and does anyone else have this problem.
Thanks John

Individual, higher atomization nozzles, positioned above each intake valve. More complicated, but you gain added quench, and keep the extra oxygen from the alcohol out of the AF sensing channel. Assuming you are running meth/water mix, given pooling. Any thoughts on pure meth?

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Doesn't so much sound like an issue with methanol injection as it does your throttle body and or TPS. If your throttle shaft seals pass that much vacuum/boost that methanol is spraying out, I'd address that first. Last... TPS should be weather proof as it's in the engine bay, maybe time for replacement anyhow. I'm using methanol injection sprayed pre-turbo and no issues here although it hasn't been together this way for more than a year.


EDIT: I missed that little tidbit where you mentioned considering moving the methanol spray nozzle to the inlet side of the intercooler. DO NOT use this location for methanol injection as it guarantees condensing of the water/meth mix as it diffuses through the intercooler core. Worse yet, you've made your intercooler useless as you've cooled the air down before entering the core and the temperature difference between charge air and ambient is now minimal reducing efficiency. Always spray after intercooling.

When/how much boost is your injection settings? Is it "all-in" at a set pressure on/off style or does it modulate output based on boost/load?

They say it's bad for your teeth! heh-heh...

Everyone has their own preference but I always try to spray upstream of the intake air temp sensor if at all possible so that I can quantify if the system is working or not. When IAT's get out of whack from it not turning on (and my last controller failed me several times...) things get reeled back in safely. I can look back in the logs and see intake temp rise, timing get pulled, and boost controller duty cycle get reduced anytime temps go over 140.

Also on the pure methanol stance, water is what has the most latent heat vaporization so you get less cooling with pure methanol. In addition, in pure form it's incredibly flammable and burns clear. Worse yet, it's pure fuel so you either run quite rich and lose power when it kicks on or you tune more aggressively timing wise and lean out the tune to compensate but then what happens when it doesn't activate? You're already over the line.


But think of all the wrenching you'll get done in a fraction of the time! :cool: