[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

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 . . .