2001 allroad 2.7t
ive replaced the diverter valves and done a pressure test, couldn't find anything leaking except i could hear a bubbling noise around the driver side turbo. 034 motorsports said they found a small coolant leak in the turbo but it wasn't anything to worry about. does that sound right?

turbo lag is super bad, i press the gas and it barely moves for the first 2 seconds or so and then i lose all power by about 3k rpms. no check engine light

anyways, i disconnected the n75 valve today and the car drove exactly the same as when its connected. any other ideas on things to check? i want to get a smoke machine as that seems to be the best way to test.

034 motorsports did a vag com scan and only found a couple valve body soft codes for the tranny.

 

Check intake boot going to throttle body in the front for a tear in the back side of the boot they are known for this. If there is no tear in the boot then check boost pressures if boost pressures are not where they should be pull turbo intake pipe and check the play of the impeller and if the lay is very excessive then replace the turbo.

 

i checked the boot and its fine. i make about 7-11lbs of boost, the passenger side turbo seems to chirp a little louder than driver, hopefully that doesnt mean that is catching and grinding or anything

 

I'm talking about the two 3-inch "h" shaped hoses, at the end of the Y pipe. They also connect to the Diverter Valves...and that is often where they fail - creating a honking sound, while accelerating, somewhere between 3000-4100rpm. In fact, these will fail well before you blow out the robust 710n DVs. At full boost - the "h" hose @the DV inlet literally inflates the hose like a balloon, the tight hose clamp cuts into the seating area and boost is lost, just under the clamp band....similar to that of the throttle body boot.