losing boost

Jeremiah Curry jercurry at comcast.net
Tue Apr 1 20:43:02 EST 2003

huh, boost should stay up as the revs climb?  I was always under the
impression that it is supposed to fall off.  Mine does, do I need a new
vavle as well?  If so should I use the forge valve instead of stock?


-----Original Message-----
From: 200q20v-admin at audifans.com [mailto:200q20v-admin at audifans.com]On
Behalf Of Alilio, Allan
Sent: Monday, March 31, 2003 8:20 PM
To: 200q20v at audifans.com
Subject: re: losing boost

Allan, Your Bypass Valve is blown. Granted, it could be something else but
its a VERY common problem on the Audi 20vt motors and most Audi Turbo motors
for that matter. You can replace it with stock or you can put something
better in like a Forge Valve or similar. Maybe some others can describe how
to test you BPV to see if its good or not. But thats where I'd start.
l8r Todd

Looks like that was the problem.  I threw on a bypass valve from a Saab it
was also a bosch but  I heard it was upgrade to the 200 bypass valve.
Anyway under WOT now it maintains 1.7 bar all the way to redline.



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