SNogaro4

overboosting, especially in between shifts. I am running a MBC only.

Lately, my car has seemed sluggish in the mid rpms and once I hit about 5k it takes on like normal. Just pressure tested, no boost leaks.

I saw a spike of 26psi recently and back down to normal in between a 2nd to 3rd shift.

Also, the other day under WOT, I was only able to build 8-10 psi, but when I shifted, back up to 22psi.

I can see and feel the boost fluttering between 6-10psi, back and forth, at 1/4 to 1/2 throttle.

Any one have ideas? From searching I think it might be torn wastegate lines. Thanks.

BeeRock::Riding Red

what diverter valves are you running

SNogaro4

710N's, just replaced. That was my first thought too.

nyet

pressure test. Post logs.

nyet

torn wastegate lines would cause overboost

SNogaro4

Did a pressure test already. What blocks?

audiKP

did you pressure text the WG lines themselves? or just from the Y-Pipe?

SNogaro4

Havent got to test the WG lines yet.

audiKP

my guess is you'll find your problem when you do.

pitchS4

MBC only will boost flutter when operating properly