[SOLVED] Low boost and slow spool

Checked for boost leaks now and nothing to be found... So last 2 options are the tune and the turbo. Gonna wait for the tune

 

alright he didnt want to take the risk to see if it fails cause the turbo is just acting weird so need to replace the turbo....

 

I already did a smoke test and a boost leak test and no result. I got ahold of Fux. A german tuner. He told me there is a bit of a clean up in ignition and timing and something with the AFR was not correct. He sees there is like a restrictor in the tune that may causes the slow spool and slow boost. He is adding boost and i got more boost. In the negative boost it spools up REALLY fast!! like 1 tap on the gas and im boosting. Above the that it seems its still a bit struggling... to be continued

 

Ever figure this out? Having the same issue

 

Yes i figured it out! After i removed the turbo to place the cst4 i inspected the housing and it seems like the exhaust side wheel is rebuild wrongly. They put in a wheel from a BNR S4 instead of a s1. Thats how it could not boost properly.