pardon my ignorance

[ricematthews]

Welcome as a rookie shade tree mechanic.  We've all been there!

To add to the previous response:

1 bar equals about 14 psi.  It is a common unit of measurement used for both
turbo "boost" and oil pressure on these cars.

In determining total turbo "boost", you must first subtract atmospheric
pressure from the equation (about 1 bar +/-).  Thus a boost gauge reading of
1.4 bar really equals 0.4 bar or about 5.6 psi of "boost".  Boost gauge
readings below about 1.0 bar are indicators of manifold vacuum.

Bar measurements are also comon on Audi oil pressure gauges.  Same unit
conversion into psi.

Although some may disagree, as someone new to working on cars, I would
suggest a Haynes manual over the Bentley.  The Bentleys are more detailed,
but they also generally assume a higher level of competency (they are the
"official" shop manuals).  Haynes manuals tend to explain things in more
simple terms, plus they are usually available for about $12.95 at Pep Boys
and they do make one for the Type 44 Audi 5000 (don't know if it covers
turbo models or not).  When you need a high level of detail or a good wiring
diagram, the Bentleys are usually more help.

-Mark Rice

Message: 1
Date: Wed, 20 Mar 2002 20:52:07 -0500
To: Randberg at aol.com, quattro at audifans.com
From: Kneale Brownson <knotnook at traverse.com>
Subject: Re: pardon my ignorance


Check out Scott Mockry's wonderfully resourceful Audi repairs
website:  http://www.sjmautotechnik.com/

Short answers are that bar is "metric" for pressure measurement and it gets
applied to the amount of pressure under which your fuel/air mixture gets
pushed into the engine by the turbo, while  chip generally refers to part
of the engine control unit electronics hidden in the outer side of the
passenger footwell.  The ECU reads info from a number of sensors and uses
that data to determine fuel flow, among other things.

If you're going to work on these cars, you'd be advised to obtain the
Bentley repair manuals.


At 05:36 PM 03/20/2002 -0500, Randberg at aol.com wrote:

>I am working on 2 Audi 5000's One is an 85 non turbo and the other is an 86
>5000s turbo but as a hack non mechanic who will take anything apart some
>terms are Greek to me. BAR (ie 1.2 Bar) What does it refer to and what
should
>I be looking for on my turbo? Two other terms Boost and Chip.?? My torbo
has
>no relays in the fuse box under the hood. What should I have and where are
>they located. (I don't have the correct cover on the fusebox. Thanks