the s1 lives (in 720p)

[dgraber460 at aol.com]

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 
s a loud exhaust noise (unmuffled by the turbo) and that’s only at full 
oost when it's opening to regulate boost. When you close the throttle the 
astegate closes and has no ability to make any sort of noises. The chirping 
s from the intake of the turbo, it's compressor surge from having too small 
f or a total lack of charge pipe pressure relief like a blow off valve or 
ecirc valve. Old school race cars ran with no blow off valves because the 
echnology wasn't well developed and the valves of the day sucked, plus they 
ould use the high pressure pulse of air during a compressor surge to help 
e-fill the intake manifold when the throttle was opened. Porsche's race 
ars starting at the 934 then up to and including the 1997 GT1 did not use 
low off or recirc valves.
Here's a video of my car making the same noises, but at a higher frequency 
ue to a smaller turbo with less intertia:
ttp://www.youtube.com/user/5000TQ#p/u/51/e27WT5-BnKg
Testing on my car with a data acquisition system has shown pressure spikes 
ear 50psi in the intake tract when the throttle is closed and a mesurable 
eduction of lag between shifts WHEN YOU SHIFT FAST, but a huuuge increase 
n lag when you shift casually or even moderately quick. Turbo life is 
upposed to be reduced, but I wouldn't know - I had mine rebuilt as a 
recaution after about 20,000 miles of abuse and am soon to be approaching 
hat mark again.
-Cody

-----Original Message----- 
rom: Ti Kan
ent: Sunday, November 13, 2011 9:59 PM
o: Jay M
c: <dave.eaton at clear.net.nz> ; <quattro at audifans.com>
ubject: Re: the s1 lives (in 720p)
The chirping sound is of the turbo wastegate dumping boost.  That's a 
ignature sound of Audi turbo race engines of that era, not only on the 
ally cars but also the 1988  200tq Trans Am and 1989 90tq IMSA GTO.
-Ti
- 
ent from my commlock

n 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

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