[urq] Turbo/wastegate whistle: how and why?

[DGraber460 at aol.com]

In a message dated 12/29/2004 2:16:10 P.M. Mountain Standard Time,  
urq at moregraphics.nl writes:

Where  exactly does the loud whistling noise under boost come from? i.e. how 
is it  technically possible for the turbo making such noise?

Could a shot WG  diaphragm causing this whistle? I know I only have 0,45 bar 
/ 150 BHP and the  whistling noise is getting louder each month...

Also, could a wrong or  wrong adjusted WG spring cause the turbo to whistle?

Any  thoughts?

Thanks

Regards,
Maurits

1986 GV (Swiss WR)  with 200K km original turbo/wastegate...
1985 CGT KV
1982 GL  DD




I've had my share of whistles from the "land of triple K", and found most  of 
them usually in a hose or joint of some sort. My most frequent offender  has 
been the rear section of the intake manifold to the head (3 times). I have  
not heard of a diaphragm whistling, but I suppose it might. Another usual  
suspect is the turbo to intake manifold hose. They are expensive, hard to get,  and 
most have not been renewed in 20 years. Mine split just below the port  that 
splits off to the IM spaghetti hose farm. It was totally undetectable  without 
doing a pressure test.
HTH 
 
Dennis
Denver