anyone have an alcohol vapor injector?? my dad had one hooked up on his blazer back in the day that was setup for mud drag racing.. he thinks it might work pretty well on the xj too.. i recently found this company Devilsown

http://www.alcohol-injection.com/uni...stage-1-8.html

what do you guys think?

It doesn't inject a vapor. It just squirts water and or meth into your intake manifold.

I have been through three or four of them on my Neon and come to the realization that they are more trouble than they are worth. Whenever you need it to work it doesn't. Sometimes it sprays when you don't want it to. Nozzles get clogged. Lines pop off. Pumps die. The controller craps out. It's always some ****.

you sure? damn i thought that it vaporized in the little storage tank nd got sprayed as a fine mist into the manifold constantly..

Yeah. You have a tank, some people just use their washer fluid reservior. Then it goes from that through a hard vinyl hose into a pump. The pump is either 150-250PSI usually. The pump then forces the water/meth mix through a nozzle that "atomizes" it as it sprays it into your intake path. If you look at it spraying, it really just looks like one of those misters that you see at Disney World in the summer. It's definitely not a vapor. It would soak your hand if you held it in front of it.

Mostly see this on deisel trucks to reduce egt's when running lots of boost, or high compression on a gasser. Snowperformance also has water meth injection systems, just not sure if this would do jack on a 4.0?

ohhh okay i gotchya. so, even if its setup right...you still dont think its worth doing to an xj?

For a production engine, you don't really need it. I've used them with forced induction (particularly with turbocharged applications running greater than 14psig of boost) to offset the increased intake temperature due to air compression, but it's not something you're going to find useful on N/A production engines. Don't bother.

It's not a bad idea - used properly. It can also be useful for high-compression engines (if you effectively fog the water/MeOH mix!) and it will work better than the EGR system can hope to, simply because it won't crap things up with carbon.

In fact, it has the effect of loosening carbon deposits in the chambers and blowing them out the tailpipe, which keeps "hot spots" down (carbon deposits - especially once they become "hard" deposits - can retain heat and glow red-hot - leading to preignition and/or detonation. Oops.)

But, I just wouldn't bother doing it on a production engine - especially a low-compression engine, like ours.

It will also richen your A/F ratio up around .5 to a whole point. Probably more on a N/A motor. Just a waste of money, really.