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Re: It's better when it's cold outside ...
> Does your ur-Quattro really have the capability for the brain to control
> the boost level? Most are 100% mechanically controlled.....
There's a small switchover valve that gates either inlet manifold pressure or
air inlet vacuum into the back of the wastegate. It's described (in an
underbonnet sticker) as an "Elektroumschaltventil" - one diagram I found in the
archives on swiss describes it as a "computer controlled valve". It has VERY
carefully colour-coded hoses - marked in red and blue.
The surging I experienced yesterday and today is entirely consistent with this
valve being cycled by "the computer".
On a related topic, I've been promised a COMPLETE maintenance archive on
microfiche for GBP35 - GBP50.
Sievers Consulting UK
Vice Chair, UK Computer Measurement Group
Phone +44 385 302803
Fax/BBS +44 1536 723021