Quote Originally Posted by fri3dchick3n View Post
Hey guys. According to my AEM WB I am running 10.4-10.9 AFR at WOT. Ive had trouble finding a GTP AFR range so im asking you guys if this seems normal?

Mods are: 3.5 MPS, SD Headers, Shift Kit, Intake. Meth but its OFF currently.
10.4 is very rich. 10.9 is rich, but not that far off. I like low 11s AFR for a non-charge cooled roots blower car like yours. With an intercooler, mid-high 11s are OK.

Also note that you are going to be richer still (generally by .5 AFR, but it depends on nozzle size and water/meth ratio) when the meth is flowing.

I'd take a good look at your fueling and make some changes. I don't like that your AFR fluctuates by .5 at WOT (that's way too much) and wonder if you have a mechanical fuel delivery issue (dirty filter, weak pump) or a tune issue (MAF not dialed in). Is it getting richer or leaner during a pull? Once you get AFR to not fluctuate so much I'd lean it out to the low 11 range.