What size pulley and when to start spraying meth?

[chrisrexmandie]

Im just about to finish up my install of my AEM meth injection kit. I was wondering at what psi should it start to spray and at what psi should it be set to full power? I am currently running a stock pulley and was wondering what size I could drop down to now that I have the meth injection.

Engine Mods:
CAI
180 stat
Front power log
3 inch downpipe
Autolite 104's
Self modified zzp tune
EGR Delete

 

[Scottydoggs]

i always wanted to meth up a non intercooled set up. id think you could do a 3.2, just watch your not maxing out the injectors, 3.2 on a ic made 8.5 psi and my stock injectors were getting close to max. went to 42's. more boost you have, more injector you need. 3.2 would likely get you around 13-15 psi. where my 42's maxed out on the ic with a 2.8 pulley. ( ic and ported lim lowers the boost.)

i started to spray at 6 psi, max at 10 psi and used the largest jet they give ya out of the 3.

id drop the wot timing to say 10, so it cant knock on ya when your leaning the maf out. i had to take some out of the 3-7000 area, then took a lot more from 7000 up to 10500. to get the afr to a mid 12, this will take more then one try to get right.

then spray it see where the afr gets down to, you want low to mid 11's. once the afr is right on the wb, ( you may have to maf tune some more after spraying the meth.) start adding timing back. i was able to get 21 wot out of mine. you might get less timing due to having more boost.

keep us posted, id love to see where this leads.