200 boost

[Phil Haag]

Gee, everyone has a different number for "normal" boost on a 200TQ.  Mine 
runs 1.4 on the gauge, all stock 200.  Oh and by the way a normally 
aspirated engine under hard acceleration exhbits very low "small" vacuum, 
not a large vacuum.  Highest vacuum is under deceleration and idle 
conditions. Wide open throttle causes a large drop in manifold vac.  As a 
matter of fact vacuum gauges, marked as fuel economy gauges were popular on 
various cars some decades ago. They used vacuum to denote fuel savings.  The 
high vacuum part of the gauge was marked good fuel ecnonomy, and low vac, 
poor fuel economy.  And of course on a boosted engine max performance is 
with highest manifold pressure.

Phil Haag
1990 Audi 200 TQA


>From: "Phillips, Kevin" <kevin.phillips at barco.com>
>To: "'Michael Pederson'" <mlped at uswest.net>,        "Beatty, Robert"  
><BeattyR at ummhc.org>, quattro at audifans.com
>Subject: RE: 200 boost
>Date: Thu, 16 Nov 2000 15:57:17 +0100
>
>The correct readings are around 1.2-1.3 under hard acceleration in 2nd/3rd
>gears. With engine off and ignition on you will see 0.9-1.0 i.e. one
>atmosphere. On deceleration it will drop to 0.2-0.3.
>Remember in a normally aspirated engine under hard acceleration you would
>see a large vacuum so the fact that you see any pressure over 0.2 means the
>turbo is blowing like the wolf in the 3 pigs story.
>
>Kevin Phillips  1990 200TQ, 1995 900SET.
>BARCO Graphics Integration Team
>40 Westover Road
>Ludlow MA 01056
>kevin.phillips at barco.com
>
>  -----Original Message-----
>From: 	Michael Pederson [mailto:mlped at uswest.net]
>Sent:	Wednesday, November 15, 2000 23:36
>To:	Beatty, Robert; quattro at audifans.com
>Subject:	RE: 200 boost
>
>Rob -
>
>Does the gage read "1" or "0" when you turn the car's electrical system on?
>If it reads "1" with the ignition on, but the engine off, I'd agree with
>you,
>but if it reads "0" then I would think at 1.2bar the car's gage is showing
>absolute manifold pressure, i.e. actual boost.
>
>Shouldn't be too hard to tell if cross checked with a SOP gage ("seat of 
>the
>pants.")
>The difference between 17+ lbs of boost vs. a little less than 3lbs is
>something
>most of us should be able to feel in the small of the back.  My memory
>begins to
>fail me, but I thought when my old 91 200TQ's gage got to .8 I was seeing
>some
>improvement in forward motion.  Unfortunately the Audi dropped the dash
>boost gage
>display, along with the rest of the trip computer functions in 1993 on the
>Urs4's.
>
>-----Original Message-----
>From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
>Behalf Of Beatty, Robert
>Sent: Thursday, November 16, 2000 3:14 PM
>To: 'cobram at juno.com'; ckrug at laf.cioe.com
>Cc: quattro at audifans.com
>Subject: RE: 200 boost
>
>
>Dont forget the 1st 14.7 lbs of your 17.4 is ambient air pressure at sea
>level so in effect he has 2.9 lbs of boost... which isnt much.. :)
>
>Rob
>

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