Re: Boost gauge problems

["Fred Munro" <munrof@isys.ca>]

Good point Bob. Taka said he had a VDO boost gauge, and these gauges show
atmospheric as 0. The gauge shows psig of boost or inches of vacuum from the
0 point.

Fred Munro
'94 S4  91k km

----- Original Message -----
From: Robert Myers <rmyers@inetone.net>
To: Fred Munro <munrof@isys.ca>; TM <mizutanit@mindspring.com>; Quattro List
<quattro@audifans.com>
Sent: Saturday, October 30, 1999 8:21 PM
Subject: Re: Boost gauge problems


> A word of caution here.  The manifold pressure of the engine while not
> running will be some fairly close approximation of 1 atmosphere or 1 bar
> (it depends on the barometric pressure at that particular time and
> location).  Whether the gauge might need re-zeroing or re-oneing [:-)]
> depends on the actual gauge and whether it reads in bar (absolute) or psig
> or whatever.
>
> At 07:56 PM 10/30/1999 -0400, Fred Munro wrote:
> >What does the gauge read with the engine off? Is it right on 0 or offset
to
> >the vacuum side? If it is not on 0, you will have to re-zero the gauge.
> >
> >Fred Munro
> >'94 S4  91k km
> >
> >----- Original Message -----
> >From: TM <mizutanit@mindspring.com>
> >To: Quattro List <quattro@audifans.com>
> >Sent: Saturday, October 30, 1999 4:19 PM
> >Subject: Boost gauge problems
> >
> >
> >> Hi listers,
> >> I have a VDO boost gauge in my A4 1.8T. I recently removed the gauge to
> >> paint the gauge housing, unhooking the two electrical wires and
unscrewing
> >> the vacuum line. Ever since doing that, I get a much lower reading.
> >>
> >> Is there a "recalibration" or some sort of reset necessary when
> >reinstalling
> >> the gauge? I checked for leaks, and I don't seem to find any leaks. The
> >> line has a threaded coupling that is sealed with Teflon tape.
> >>
> >> For whatever reason, I think the gauge is reading about 5 psi low- I
get
> >> about 22 vacuum at idle when I used to read about 20, and max boost now
> >> only goes to 15 when it used to overboost to about 20 psi.
> >>
> >> Any help diagnosing/fixing this problem is greatly appreciated.
> >>
> >> Thanks,
> >> Taka Mizutani
> >> 99.5 A4 Avant 1.8TQMS
> >>
> >>
> >
> >
> >
> ___
>    Bob
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