Originally Posted by NSFW
What MAP sensor are you using? I ask because the stock MAP sensor maxes out around 22 or 23 psi.
I have an ATP 3076, with IWG, Hallman MBC, and an AEM 3.5-bar MAP sensor, and I have been running 22psi for months. I had it tuned for 25psi for a little while, and I didn't have any trouble getting there.
I get about the same boost taper that you do - boost drops about 1.5psi between 4000 RPM and 7000 RPM. I've been told that an EWG would fix that, but it doesn't really bother me.
I am running the IWG actuator that came with the turbo. If I remember right, I get 12psi with the MBC turned all the way out (min boost). But it's been a long time since I actually checked.
Its not my map sensor. My boost gauge reads 22 psi as well as my netbook with the actuator wired shut. ATP is really leaning on the inlet not being a 3"
What inlet do you have NSFW?