i bet that you're getting boost creep. meaning that your wastegate can't bypass enough exhaust gases to regulate the boost to your 11psi setting.

also, 2.5" for 11psi.. 3" might get the exhaust pressure down enough to make that wastegate work.

 

i don't have that jb welded barb on my charge pipe anymore.
i got the small hole i meade in the charge pipe welded and now i have the wastegate hooked upto the compressor housing. i'm gonna try using zip ties on all my vacuum hose
connections that's the only thing that i can think of.

 

try to add a spring on the wastegate to force it to come back this should help you

 

check your couplers...leaking boost somwhere..My friend had that too.

 

This is why internal wastegats suck dick, I'd upgrade to a external.

And a 3.0in dp isnt going to make a difference on the boost.

 

is the hole on an internal wastegate actuator suppose to let out the air in the WG so the spring could close the WG fast?

 

i'm starting to think that the spring in the wastegate isn't strong enough to close the WG at 10-11psi since it's a 6psi stock waste gate.

 

better start looking at this then:

https://www.homemadeturbo.com/forum/...;threadid=2952 - lowering boost (carb spring, jeff)