A4 back on the road

[Robert Mangas]

   If turbine damage leads to wheel/shaft/bearing failure then the 
compressor can come apart if it contacts the housing at 50k+rpm.  Since 
that's on the intake side, anything downstream can get hosed.

>From: "TM" <t44tq at mindspring.com>
>To: "'Brett Dikeman'" <brett at cloud9.net>
>CC: quattro at audifans.com
>Subject: RE: A4 back on the road
>Date: Mon, 24 Nov 2003 11:38:40 -0500
>
>Brett-
>What is it going to kill if the turbo fails? Only thing I can
>think of is damage to the cat. I really don't want to spend another
>$1.5k to fix the turbo if possible.
>
>Taka
>
>-----Original Message-----
>From: Brett Dikeman [mailto:brett at cloud9.net]
>Sent: Saturday, November 22, 2003 12:44 PM
>To: TM
>Cc: quattro at audifans.com
>Subject: Re: A4 back on the road
>
>
> >  The turbo impeller got nicked, but didn't lose any blades, we'll
> >see if the turbo
> >will last.
>
>Apologies if anyone else covered this-
>
>The impeller must be replaced if there's any visible damage- and the
>entire assembly dynamically rebalanced.  Each component balanced, and
>then the whole assembly balanced together in a specific static
>alignment(ie, when it's reassembled in the turbo housing, must be
>exactly the same way).  Reman unit might end up being cheaper, or
>given the number of people upgrading these things, a used unit.
>
>Turbos are unforgiving of being unbalanced; they spin at over 50,000
>rpms- if you're lucky, it will give terrible performance, destroy its
>bearings and seize without taking anything else with it.  If you're
>not...
>
>B
>--
>----
>"They that give up essential liberty to obtain temporary
>safety deserve neither liberty nor safety." - Ben Franklin
>http://www.users.cloud9.net/~brett/
>
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