Boost dropping off?

[Oranoco]

I've found when giving my A4 a bit of right foot the boost peaks at about 0.8bar and once in 2nd and third tails right back to 0.4. Soggy wastegate actuator perhaps?

If it was one of my old Fords that's the route I'd take but the Audi has the N75 valve to control things so don't want to go swapping bits out without being sure.

 

[Blue_Thunder]

Sounds like a boost leak.

 

[AUDI TURBO]

check dump vlave and pipe etc i had VERY simalr problem with my 14 when first got it after replacing pipes, clips, dumpvlave, odd gaskets replaced ht 8psi and held like it should