[BiturboS4] S4 Blown Turbos - Update - Audi's Preliminary Diagnosis

Michael Kuriger michael at isuzu-mods.com
Thu Apr 17 10:15:49 EDT 2003

impellers also break off when a dv or torn throttle body boot are left
unfixed.  since the boost will leak out, the wastegates will stay closed
and allow the turbos to overspin.  so if you have upgraded these parts
that should be a good thing.  Another thing that can blow them is
putting on a free flowing exhaust.  this releases backpressure that is
engineered into the system in order to throttle the turbos and prevent
overspin.  Since you have a totally stock s4, these are not the cause
for your problem but just wanted to let others know.

My 2001 S4 is up to about 13,000 miles already and has a giac x chip and
awe duel exhaust.  I'm planning to put on the bigger turbos soon as well
once I figure out how to install them.


j y wrote:

>To The List,
>Well, I made that visit to my local Audi dealer today
>and I must admit, it was like going to the doctor to
>get a flu shot. You don't want that BIG needle headed
>your way - cause u know it's gonna hurt.
>To make a long story short - the official Audi
>diagnosis is blown impellers (spelling?) - both
>They have no clue as to how this could happen and want
>to break down the engine. They speculate that
>something got into the intake system but cannot figure
>out how it could have gotten by the intercoolers and
>damage both impellers. The siren (like a police car)
>sound that I hear are the distorted impellers
>according to the Audi tech.
>I inquired whether this impeller damage could have
>been as a result of excessive heat causing warpage and
>breaking off of the impeller blade(s) on the turbos?
>He would not say yes/or no. His answer was the same
>"need to break down the engine and investigate."
>Since there have been documented problems with the oil
>inlets on Y2K and early 2001 S4s - I figured that
>excessive heat damage due to inadequate oil flow was a
>potential culprit.
>Anyway, "the 'ballpark' estimate to replace two turbos
>with direct replacements + labor will about $6500"
>according to the Service Mgr.
>Again, the Service Mgr said "Audi's policy is to go
>50/50 with customers out of warranty as goodwill." He
>said "that Audi's rationale behind this is a
>pro-rating based on a 100k mi expected engine life."
>Thus, I have 52k mi  on my S4 - so Audi considers my
>engine to be 50% depreciated based on a 100k mi
>I understand this but I still have a personal problem
>if the damaged impellers are a result of excessive
>heat or manufacturer's defect.
>I left my S4 at the dealer and said "that I would
>think about Audi's 50/50 offer." I will be asking for
>something in writing from the dealership confirming
>this 50/50 proposition.
>On another note, I replaced the Stratmosphere DVs with
>the OEM Bosch DVs before going to the dealer. Well,
>they noticed that the DVs had been swapped out -
>beause the OEM clamps on the Bosch DVs cannot be
>gotten in the aftermkt and I didn't keep the orginal
>OEM clamps.
>So, no OEM clamps on the Bosch DVs leaves one open for
>questioning at the dealer. Regardless, this little
>incident did not change their proposal to me.
>Do you Yahoo!?
>The New Yahoo! Search - Faster. Easier. Bingo
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>BiturboS4 at audifans.com

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