I got a ball and spring manual boost controller from ebay. i put it in.. and it seems the minimal boost i can get is 15 psi. I want to run 11 because I have a t25. Any comments on why it's doing this?.. is there any way i can alter the boost controller?
I bought one on ebaY as well and I was having a similar problem. I just cut the spring so it was a little shorter and it worked perfectly after that. You can also get a softer spring and it will do the same thing.