I have two rs turbos and both of then have wrong connected hose on amal valve. and both cars boost 0.3 bar. when I recconect amal like on photo, boost is normal.

I mean, hose which must go from turbo to "C" on amal valve, ex owner connect it to W.

Karlos: If I am you, will get one amal from friend just to try, because maybe someone "work" on your valve and maybe valve dont do they work...