the s1 lives (in 720p)

[NIck Miller]

You actually can get a garrett bb turbo rebuilt. Its just not endorsed by
garrett, as they want to sell you a whole chra.  We have a miata running a
rebuilt 2560 (after 70k mi of use) and its on its 20000th mile now.  There
is a small shop in midcal who does it, former garrett employee that went
indy.
On Nov 14, 2011 10:01 AM, "Cody Forbes" <cody at 5000tq.com> wrote:

> There are turbo shops all over with the capability to rebuild, but note
> that Garrett ball bearing turbos can not be rebuilt. The shop disassembles
> the turbo and replaces all seals and any work bearings. At that time
> they'll also advise of wear or damage to the turbine and compressor. Mine
> was done by a shop friendly to my business for about $400 IIRC.
>
> -Cody (mobile)
>
> On Nov 14, 2011, at 11:18 AM, dgraber460 at aol.com wrote:
>
> > Cody;
> > How did you have rebuild your turbo?
> > What is a fair price to do so?
> >
> > Dennis
> > Denver
> >
> >
> > -----Original Message-----
> > From: Cody Forbes <cody at 5000tq.com>
> > To: Ti Kan <ti at amb.org>; Jay M <jaybird002 at msn.com>
> > Cc: dave.eaton <dave.eaton at clear.net.nz>; quattro <quattro at audifans.com>
> > Sent: Sun, Nov 13, 2011 9:08 pm
> > Subject: Re: the s1 lives (in 720p)
> >
> > Sorry, but that is a common misconception. The only noise a wastegate
> makes
> > is a loud exhaust noise (unmuffled by the turbo) and that’s only at full
> > boost when it's opening to regulate boost. When you close the throttle
> the
> > wastegate closes and has no ability to make any sort of noises. The
> chirping
> > is from the intake of the turbo, it's compressor surge from having too
> small
> > of or a total lack of charge pipe pressure relief like a blow off valve
> or
> > recirc valve. Old school race cars ran with no blow off valves because
> the
> > technology wasn't well developed and the valves of the day sucked, plus
> they
> > could use the high pressure pulse of air during a compressor surge to
> help
> > re-fill the intake manifold when the throttle was opened. Porsche's race
> > cars starting at the 934 then up to and including the 1997 GT1 did not
> use
> > blow off or recirc valves.
> >
> > Here's a video of my car making the same noises, but at a higher
> frequency
> > due to a smaller turbo with less intertia:
> > http://www.youtube.com/user/5000TQ#p/u/51/e27WT5-BnKg
> >
> > Testing on my car with a data acquisition system has shown pressure
> spikes
> > near 50psi in the intake tract when the throttle is closed and a
> mesurable
> > reduction of lag between shifts WHEN YOU SHIFT FAST, but a huuuge
> increase
> > in lag when you shift casually or even moderately quick. Turbo life is
> > supposed to be reduced, but I wouldn't know - I had mine rebuilt as a
> > precaution after about 20,000 miles of abuse and am soon to be
> approaching
> > that mark again.
> >
> > -Cody
> >
> >
> >
> > -----Original Message-----
> > From: Ti Kan
> > Sent: Sunday, November 13, 2011 9:59 PM
> > To: Jay M
> > Cc: <dave.eaton at clear.net.nz> ; <quattro at audifans.com>
> > Subject: Re: the s1 lives (in 720p)
> >
> > The chirping sound is of the turbo wastegate dumping boost.  That's a
> > signature sound of Audi turbo race engines of that era, not only on the
> > rally cars but also the 1988  200tq Trans Am and 1989 90tq IMSA GTO.
> >
> > -Ti
> > --
> > Sent from my commlock
> >
> >
> > On Nov 13, 2011, at 6:18 PM, Jay M <jaybird002 at msn.com> wrote:
> >
> > >
> > > Nice bit of driving!. That car produces some interesting sounds as
> heard
> > > by the video. Thanks.
> > >
> > >
> > >> Date: Mon, 14 Nov 2011 14:02:43 +1300
> > >> Subject: the s1 lives (in 720p)
> > >> From: dave.eaton at clear.net.nz
> > >> To: quattro at audifans.com
> > >>
> > >> http://www.youtube.com/watch?feature=player_embedded&v=_onMjruyzd0
> > >>
> > >> love the uphill power slidesŠ.
> > >>
> > >> dave
> > >> '08 rs6 avant
> > >> '04 allroad tdi
> > >>
> > >>
> > >> _______________________________________________
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