Date:         Thu, 28 Oct 1999 22:00:17 -0700
Reply-To:     David Marshall <vanagon@VOLKSWAGEN.ORG>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Marshall <vanagon@VOLKSWAGEN.ORG>
Subject:      Re: Mileage at altitude - responses/experiences requested
Comments: To: John Rodgers <inua@SCOTT.NET>
In-Reply-To:  <38191F31.ABE8BA5E@scott.net>
Content-Type: text/plain; charset="us-ascii"

The CIS-E systems found in the 85 thru 89 Golf GTI / Jetta GLI and 1.8L 16V
engines have a plug for an altitude sensor.  North Americia VWs had this
plug empty, but it was used in Europe.

At 10:14 PM 28/10/1999 -0600, John Rodgers wrote:
>Ken, that would be correct.
>
>At altitude that air density becomes less and less in relation to the
amount of
>fuel going through the engine, so fuel air mixture goes to the rich side, you
>get incomplete combustion and a loss of power is the consequence. There
may be
>some automatic mixture adjustment built into the F/I but it is probably small
>and the limits are reached very quickly if its there at all.
>
>As you may well know, fuel injectiojn systems and some of the big carburetors
>on piston type Aircraft powerplants have auto-mixture controls, and smaller
>aircraft have manual mixture controls that can be operated from the cockpit.
>Never saw an automotive vehicle so equipped.
>
>John Rodgers
>
>KENWILFY@AOL.COM wrote:
>
>> I don't know about better mileage but I experienced power loss and rich
>> running going over the Sierra Nevadas a couple summers ago.  I think it was
>> 12,000 ft or maybe a bit more.
>>
>> Ken Wilford
>> http://www.vanagain.com
>> John 3:16
>> Office (856)-765-1583
>> Shop (856)-327-0027
>> Fax   (856)-327-2242
>
>

--   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      --
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