Got another minor gremlin,
For a long time my car has had a weird boost fluctuation at part throttle and low boost. It happens at any speed but needs just enough load in the primary turbo rev range to be coming onto boost.
The issue can be easily reproduced during highway driving up a long hill. If I gradually accelerate or hold speed it will fluctuate up and down 2 or 3 psi every second or so. It's not a dramatic effect but is noticeable.
Throttle position (about 20%) and boost level (0-5psi) need to be just right. That's why I notice it on hills as it's not often you drive steadily in that boost range. Any extra or less throttle causes it to stop. If I continue to hold the throttle steady it will just keep pulsing until I need to slow down, as it tends to pick up speed.
I had hoped a retune would solve it, but alas it seems to be mechanical or sensor related. On the logs I can see the secondary waste gate opening and closing in sequence as it happens. I assume the secondary waste gate refers to the ECV and correct me if I'm wrong but this model uses the ECV for boost control. I know if I block off the positive ECV port the fluctuations don't happen. The ECV is now ported but it did do this on a stock one too.