Theory LONG: Audi Warranty issues, AoA was: Car fax

[Dan DiBiase]

Well, that's interesting... Fortunately, the last mile to my house, I must
drive slowly since it is through heavily child-infested neighborhoods! But
guess I need to stop sitting around in my driveway when I get home.

Dan D
'04 A4 1.8T q MT-6
Central NJ USA
--- Phil Payne <quattro at isham-research.com> wrote:
> > Steve, good point regarding cooling down the turbo. I generally sit in
> my
> > driveway for about 45 seconds to a minute (depending on the amount of
> time
> > I have driven the car) and at least wait for the turbo to spool down
> (I
> > can hear it doing that if I have been driving for a while and/or
> driving
> > hard) - then wait a bit longer.
> 
> EXACTLY the wrong thing to do.
> 
> Despite all the crap about oil-cooled turbos and water-cooled turbos,
> all Audi turbos are
> actually air-cooled.  Oil has almost no cooling effect, and serious
> water flow through the
> later models' water jackets (only around the bearing) doesn't start
> until some time after the
> ignition has been switched off.
> 
> You need airflow to cool the turbo, and there is no airflow if the car
> is stationary - except
> the paltry contribution of the alternator fan.
> 
> The correct procedure is to drive the last mile or so at the very least
> without using WoT - a
> steady tootle along is preferable.  When you come to a halt, switch the
> engine off immediately
> or it will start to heat up again.
> 
> And if you mess around with bits and pieces like dump valves, make sure
> they don't impede the
> airflow to the turbo and exhaust manifold.
> 
> --
>   Phil Payne
>   http://www.isham-research.com
>   +44 7785 302 803
> 
> _______________________________________________
> quattro mailing list
> quattro at audifans.com
> http://www.audifans.com/mailman/listinfo/quattro


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