the s1 lives (in 720p)

[Cody Forbes]

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
> >>
> >>
> >> _______________________________________________
> >> quattro mailing list
> >> http://www.audifans.com/mailman/listinfo/quattro
> >> http://www.audifans.com/kb/List_information
> >
> > _______________________________________________
> > quattro mailing list
> > http://www.audifans.com/mailman/listinfo/quattro
> > http://www.audifans.com/kb/List_information
> _______________________________________________
> quattro mailing list
> http://www.audifans.com/mailman/listinfo/quattro
> http://www.audifans.com/kb/List_information 
> 
> _______________________________________________
> quattro mailing list
> http://www.audifans.com/mailman/listinfo/quattro
> http://www.audifans.com/kb/List_information