[urq] Turbo/wastegate whistle: how and why?
Pasqualoni, James E
james.pasqualoni at gs.com
Thu Dec 30 10:40:49 EST 2004
My sense is it's the wg diaphragm. I recently installed a stiffer wg spring
w/ecu mod on my 86 5k tq, increasing boost from 11 to 15 psi, and
immediately, I heard the whistle while boost was building. Opened up the
wg, pulled out the diaphragm, and it was slightly torn around a few of the
stud holes. I haven't replaced it yet, as I'm not seeing any over-boost
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
Of DGraber460 at aol.com
Sent: Thursday, December 30, 2004 10:26 AM
To: urq at moregraphics.nl; urq at audifans.com
Subject: Re: [urq] Turbo/wastegate whistle: how and why?
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?
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
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
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
doing a pressure test.
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