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

[Robert Pastore]

Check to make sure the throttle body mixture adjustment screw is still
there.  I've lost mine more than once and the sound is a very pure whistle.
Bob   

-----Original Message-----
From: Brandon Rogers [mailto:brogers at terrix.com]
Sent: Monday, January 03, 2005 11:38 AM
To: Maurits Jonkergouw; Audifans
Subject: Re: [urq] Turbo/wastegate whistle: how and why?


Sounds like you have a serious vacuum leak.  It could come from any number
of places.  Best thing to do is pressurize the intake system and you will
likely find it easily.  For a visual - I'd first check:

1.  turbo to IC hose
2.  IC to IM hose
3.  1.5 inch (apprx length) 90 degree bend hose at back of head to valve
cover breather

But seriously - just pressurize it and the leak will manifest itself.

Brandon

----- Original Message ----- 
From: "Maurits Jonkergouw" <urq at moregraphics.nl>
To: "Audifans" <urq at audifans.com>
Sent: Wednesday, December 29, 2004 2:14 PM
Subject: [urq] Turbo/wastegate whistle: how and why?


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
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