[Biturbos4] All causes to turbo failures known?

California Fields cfields72 at hotmail.com
Wed May 5 15:04:51 EDT 2004

Keman - regarding your #2 point below (getting boost gauge to monitor turbo 
boost). Are you suggesting that an overboost/overspin situation would be 
apparent by seeing boost spikes? What if there's a boost leak? Won't the 
turbos overspin in that scenerio but still show normal (or even reduced) 
boost? If so, I don't know if the gauge will help.


>From: "Keman" <keman at interwolf.net>
>To: "Josef Hebenstreit" 
<josef.hebenstreit at hispeed.ch>,<biturbos4 at audifans.com>
>Subject: Re: [Biturbos4] All causes to turbo failures known?
>Date: Tue, 4 May 2004 20:30:30 -0400
> >> I have a S4 2,7 Biturbo/1999 and about 160.000 km. The 
> >> pushed the performance to 310hp instead of 265hp. Even though 
I put
> >> my car to the service on a regular basis a turbo failure was
> >> inevitable!
>What kind of failure?
> >> 1)    Wear
>With infrequent oilchanges and poor quality oil, a turbos bearings can
>certainly wear out. They don't have to, Gerret for example will tell you
>that their turbos will outlast any engine you attach them to so long as
>nothing breaks that controls the turbo.
> >> 2)    Boost leak causes over-spinning of the turbo -> rpm 
to high ->
> >> mechanical breakdown
>IMO there's your #1 cause. I highly recommend a good boost gauge .. I've 
>one since 10k miles, even though my S4 still isn't chipped.

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