Originally Posted by mutydog
ok, do you think that a fmu would work ok with a stock fuel pump? or will that kill it? also, i have a narrowband air/fuel ratio gauge, and it shows it pegging rich at WOT......but i probably shouldnt trust a narrowband, huh?
but also, my egts stay lower than stock at wot(around 1250 degrees), and that leads me to believe that i have enough fuel. what do you think? oh, and what year of impreza do you have? do you know exactly what your air/fuel ratio is at wot with a 8-1 plate?
Well first thing i would do is upgrade your fuel pump. That stock one isn't efficient enough. See how it runs, then buy an fmu. Narrowbands really aren't accurate. I have a 96 impreza ej22e. I don't know the af ratio but did extensively research on other builds that tells me i have a safe af ratio. I might get a wideband one of these days.