I searched for this but just didnt find an anwser, so hopefully someone can help me out. so, i put a manual boost controller on my car not to long ago, i started out just turning it up little by little but i didnt notice a difference in boost. so i maxed the boost controller out and went for a test drive to see if it was working. i only came out with two more pounds of boost with the boost controller maxed out. later i found out i have vaccum leaks, so what i am wondering is if this is only the vaccum leaks keeping me from raising the boost or if it could be something different and even more major. by the way, i know it is not the boost controller because i took it off my buddies car when he got a new one and it worked fine on his car.
