Date: Mon, 27 Mar 2000 22:07:50 -0800
Reply-To: David Marshall <vanagon@VOLKSWAGEN.ORG>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David Marshall <vanagon@VOLKSWAGEN.ORG>
Subject: Re: David Marshal. Why did this mod increase my fuel economy?
In-Reply-To: <aa.3030182.2611922e@aol.com>
Content-Type: text/plain; charset="us-ascii"
I would say the statement of the engine gets more air and things get leaned
out would be un-true in this case. CIS as you may already know is a very
precise metering system. If anything the engine would see a richer
mixture at full throttle due to the vacuum operated Audi 5000 warm-up
regulator. A mixture of 1.5% is well within spec of a plain jane CIS
system and is just slightly richer than the happy 14.7:1 air:fuel ratio
which is a happy medium between economy and power. A value of 1.5% CO
brings you just shy of the 12.5:1 ratio for maximum power, this also brings
the Hydro Carbons up, which is what the smog police don't want to see. The
value of 1.5% is the factory spec for the 1979 Audi Fox (manual) that the
fuel distributor came from.
On the post script, I have yet to see a 4 cylinder to 5 cylinder adaption
plate for the Audi 5000s. I would dig into the Audi 4000 bin and take the
bellhousing and flywheel from a mid 80s 4 cylinder - *should* be a bolt up
- the flywheel is the only really big concern here.
At 11:42 PM 27/03/2000 EST, Michael Modl wrote:
>In a message dated 3/27/00 6:16:28 AM Pacific Standard Time,
>lindgre@ONLINE.NO writes:
>
><< So, why did things get better with a throttle that opens quicker? Not
>that
> > I am complaining! >>
>
>Simple. You have the CO set at 1.5, which is too rich. It should be around .4
>CO at idle. That is what a lambda ECU would hold it at if you had a O2 sensor
>in your fuel injection system. Who knows what your CO is at cruising speeds,
>probably higher. Your car WAS simply running too rich. Now you have the extra
>air that it needs requiring less throttle for more power. See ya, Michael
> 87 quattro
> 87 syncro
>
>PS, David, is there an adapter plate for TDI engine to mate up to an Audi
>Quattro 5000 5 speed trans. I'm assuming there is if an inline 4 will bolt up
>to a vanagon transmission and with the 5 cyl conversion kit available with an
>adapter plate to bolt the 5 cyl to the vanagon trans. What are your thoughts?
> Thanks.
>
>
-- David Marshall - - Quesnel, BC, Canada --
-- 78 VW Rabbit, 80 VW Caddy, 84 VW Westie, 85 VW Cabriolet --
-- 87 Audi 5000 Quattro, 88 2.0L VW Syncro Double Cab --
-- David's Volkswagen Home Page http://www.volkswagen.org --
-- Fast Forward Autobahn Sport Tuning http://www.fastforward.ca --
-- david@volkswagen.org (pmail) or vanagon@volkswagen.org (list) --
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