Thanks for input on S4 Avant

[Ti Kan]

TM writes:
> Mike-
> There are a few points that you need to keep a close eye on with the
> 2.7T engine:
> 
> Throttle Body Boot (the infamous TBB)- apparently, these tear quite
> often, although current S4 owners are not certain whether this is due
> to the old design hose clamps (not used on current production) or if
> the boot itself is just a bad design.

The problem hose is commonly called the "F" hose due to its shape.
On newer production S4s there is no longer such a hose.

> Bypass valves- the factory Bosch valves seem to fail with regularity
> on the 2.7T, so you should keep an eye on them or simply replace them
> with the Forge, Bailey or TurboXS valves, of which it appears that
> everyone has had good experiences with.

Same goes with the 1.8T engines, but many people are also running with
the stock bypass valves with no problems...  If this car is just going to
be a grocery getter with the occasional spirited drive I would not worry
too much about it.

> As these cars don't have afterrun pumps, make sure you run the car
> gently and let the turbos cool down before you shut the car off.

These cars do have an afterrun system, but its activation threshold is
apparently much higher.  I have never heard mine run, but others on the
BiturboS4 mailing list have.

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
-- 
    ///  Ti Kan                Vorsprung durch Technik
   ///   AMB Research Laboratories, Sunnyvale, CA. USA
  ///    ti at amb.org
 //////  http://www.amb.org/ti/
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