[Vwdiesel] garrett turbo disassembly complete

[Area31 Research Facility]

My '91 Jetta with 1.6TD has a turbo that can be heard faintly from a small
hole in the vertical cast iron downpipe that goes from the turbo to the
toilet bowl flange.  The hole is about 10 inches after the turbo and does
not make much noise but the turbo has just the right volume so you can hear
it spool up or twitter IMO.  I suspect that when I seal the hole I won't be
able to hear the turbo and that will be a problem for me as I like the sound
as it helps tell me what the engine is doing and how it is handling loads,
plus I think it sounds cool. ;)  I am prepared to install an audio
transducer (microphone) to pick up the turbo whine to restore it if it goes
away with the exhaust system final repair.  How and where I can mic the
sound is not clear yet.  An ordinary mic won't last if stuffed in an exhaust
pipe near the engine. Perhaps I need a piezo sensor of some sort. I wonder
if a car knock sensor will act as an audio microphone?  Ideas are welcomed.

Rob

----- Original Message -----
From: <LBaird119 at aol.com>
To: <vwdiesel at vwfans.com>
Sent: Saturday, July 16, 2005 4:46 PM
Subject: Re: [Vwdiesel] garrett turbo disassembly complete


> >...How do you know when a turbo is bad?
>
>   It sucks oil, made a funny noise ONCE and now there's no power,
> bearings have end/thrust play, compressor or impeller is chewed up.
>
> > >My latest Q is very quiet on spoolup (not that I've done much testing
on
> > it
> > >as I've put it in storage for a couple of months)My current driver has
a
> > faint
> > >whistle on spoolup and when standing behind it the exhaust sounds like
one
> > >of those '70's fishtail exhaust warbles(8^D)
> > >It's not changed in 3 years or so.
> > >About 6 years ago I sat in my first diesel Quantum; but I didn't  buy
it
> > because >the turbo
> > >whistled so loudly that you had to keep the window shut and the seller
said
> > it was >normal!
> >
>   Probably was "norma" for that car.  It has a lot to do with the exhaust,
> a little to do with the intake and a little to do with how "clean" the
edges
> are on the compressor wheel it seems.
>   Some you hear, some you don't and some you can hear only if
> you listen to the tailpipe.  Put a "cut-out" exhaust close to the
> engine, you'll hear it!  ;-)
>      Loren
>
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