[200q20v] RE: [s-cars] Oil Pressure

[Calvin & Diana Craig]

Rob,
	I would believe this if it wasn't for the fact that in almost every other
S4 I have ever driven it read 0 when the engine was off and the ignition was
on, plus I see no reason Audi would have switched gauge implementations as
it would have cost money rather than saved it.  Also my gauge stays with the
1 Bar offset and as such is just off the scale when cruising at 75 MPH which
renders the gauge pretty much useless, which BTW, is what I think most
electrical oil pressure gauges are, just a little better than idiot lights.
Most likely explanation is crappy gauge or sending unit.
--Calvin Craig
Parker, CO
'92 S4
'91 200 TQ
'89 200 TQW
'72 Formula Firebird

-----Original Message-----
From: Rob Pecsar [mailto:rpecsar at pacbell.net]
Sent: Sunday, December 16, 2001 10:09 AM
To: Calvin & Diana Craig
Cc: Martin, Gary G; '200q20v'; 'AUDI S Cars Discussion List'
Subject: Re: [s-cars] Oil Pressure


I spent a few years in medical engineering (pneumatic) and the type of gauge
difference may be explainable:

It might be that the S4 gauge measures in absolute pressure (that's why it
reads 1 bar
with engine off, just like your boost gauge - our atmosphere is at 1 bar),
and the 200
measures in differential pressure...if true, then the 200 will read zero
with the
engine off. These two approaches to measuring pressure are typical for gauge
manufacturers.

FWIW,

Rob Pecsar
'92 S4



Calvin & Diana Craig wrote:

> Gary,
>         I have oil pressure gauges in my '89 200, 91 '200 and '92 S4 that
all read
> something different, and one gauge that I know for sure is off in the S4
> because it reads 1 Bar without the engine on, my belief is these gauges,
or
> sending units as I'm not sure which is wrong, were not high on the list of
> accuracy priorities in the design.  If you are really worried get a
> mechanical gauge and check for sure.
> --Calvin Craig
> Parker, CO
> '92 S4
> '91 200 TQ
> '89 200 TQW
> '72 Formula Firebird
>
> -----Original Message-----
> From: Martin, Gary G [mailto:MartinGG at aetna.com]
> Sent: Saturday, December 15, 2001 4:25 PM
> To: '200q20v'; 'AUDI S Cars Discussion List'
> Subject: [s-cars] Oil Pressure
>
> Just curious about this. My 94 S4 runs about 4 bar, with 10w30 at cruising
> 3000RPM, fully warmed up.. My 200 20V runs about 3 bar under same
> conditions. Same engine, why different oil pressure? Curious as to what
> other 20V owners have for oil pressure.
>
> Curious Gary
> 94 UrS4
> 91 200 TQA
>
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