Hello guys. I have D15Z6 with Eaton M65 that is pushing 0.4bar. Whenever im driving normally up to 4kRPM my blow off can let air go out without higher problem BUT! when im at red line and im gonna leave car on gear to stay on high RPMs my blow off cant handle it when throttle body is closed and it is pushing air where the compressor is sucking air and i have to push clutch to no make aby boost. Compressor is working left side and BOV is fake Greddy RZ style.

 

What is happening on high rpm ?
The blow off vaccumm hose gets air after the throttle body?
Do you have pictures?

 

Has trouble opening under high boost conditions? Yeah, post pictures of how the hose is connected and where it goes.

 

I'm curious how you are running a blow off valve on a positive displacement supercharger. Can you post pictures of your setup?