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RE: 5kCSQ Overboost problem
Only one thing - the port on the wastegate won't hold pressure or vacuum...
perhaps I have a problem with the wastegate.
An empirical observation from my UrQ. Try as I might, I can build
neither significant pressure nor vacuum on the manifold-side of my UrQ's
wastegate, using my little hand pump. Yet if I connect to the atmospheric
reference port, it will hold pressure/vacuum all day long. (And the waste-
gate operates just fine.) I have concluded that the Audi wastegates some-
how flow ("consume") gas as part of their operation. Which would explain
the monster 8 or 9mm hose connection to the wastegate, vs the tiny 4-or-so
mm atmospere port . . .
How did you seal the turbo and you might have one or more exhaust valves open.....