Honking Bypass valves?

[C1J1Miller at aol.com]

Javad:
Bet you used a generic bosch bypass valve, and not the one spec'd for the 
audi 20vt (200q20v, s4/6), which has a reinforced diaphram.
Good details, pics, discussion, part numbers here:
http://www.sjmautotechnik.com/20vboost.html#hoset
and more here:
http://members.aol.com/c1j1miller/engine.html#Bypass valve

hth, chris miller, windham nh, c1j1miller at aol.com




A few months back I put a Bosch type Bypass valve in 80qt.  I have it 
rigged in a stock type installation.  Ever since installing it, I get this 
"honking" sound between 0 and 5 psi or so, or only at part throttle.  At WOT 
the sound is not there, and above 5 psi or so it goes away.
    My feeling is that the valve is cracking open, and in doing so lets a 
small amount of air past the diaphram, causing it to resonate and flap-making 
the resonating honking sound.  Have any of you ever experienced this problem? 
 It makes part throttle driving  very annoying, it feels like there is 
something wrong with the car, when I know there is not.  TIA,
Javad Shadzi
80 quattro turbo