BNR S3 No boost at low rpm's

Hello,
i just installed my bnr s3 and i'm running intro one issue. My stock turbo ran without any issues on 300hp.

it barley makes 3-4 psi under 4000rpm. after that it goes as it should go from 2500rpm.

Grimmspeed boost controller (stock map sensor atm, tunner said it's not important for now) and all supporting mods are installed.

It peaks at 19PSI after 5500rpm.

I checked the WG, Turbo itself, Lines, Leaks etc..

The tune is good, there are no issues there at all.
I unplugged the EBCS wbcs already, it should create overboost but it acts the same. it doesn't matter if plugged in or not.

WG opened at 0.6 bar, now i've tightened it to 1.1 bar. Same issue.

I'm asking myself if anyone ever had this issue and any fix for it.


Logs are in the 3rd gear.

 

Do you have an exhaust leak

Is the wastegate able to close fully?

 

Check your catalytic converter, could be fucked and blocking the exhaust flow.

 

I'm straightpiped i'll check.

And yes the WG closes fully.

 

I don't have any.