[Biturbos4] Turbo questions

Quincy Chiang b5quattro at shaw.ca
Tue Aug 9 14:41:28 EDT 2005

Also the tight packaging of the engine bay doesn't help either.  The immense amount of heat generated by the turbos can'd dissipate quickly and it's trapped in the engine bay.


----- Original Message -----
From: Steven Lin <steven at juniper.net>
Date: Tuesday, August 9, 2005 12:11 pm
Subject: Re: [Biturbos4] Turbo questions

> Robert Bullivant writes:
> > What gives with Audi's turbos and their apparent lack of staying
> > power?
> It's not so much the turbos themselves but all the associated
> plumbing.  There are a quite number of weak points, including the
> Throttle-Body-Boot (TBB), F-Hose (MY2000 only), By-Pass Valves (BPV),
> Intercooler endcaps, and the previously mentioned oil return lines.
> Except for the oil return lines, failures in any of the other areas
> often results in a boost leak, which can lead to overspinning of
> turbos.  That's usually when your turbos go bye-bye.
> There also seem to be some number of occurrences of FOD (Foreign
> Object Damage), where something is sucked into the turbos.  This
> usually results in a more violent form of turbo death, with big clouds
> of smoke.  I'm not quite as familiar with the actual causes of FOD.
> -- 
> Steven
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