Date: Sat, 15 Jan 2000 11:08:20 -0500
Reply-To: EMZ <vw4x4@FYI.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: EMZ <vw4x4@FYI.NET>
Subject: Re: Engine management (manual control of mixture)
In-Reply-To: <38808741.B0C1404A@sympatico.ca>
Content-Type: TEXT/PLAIN; charset=US-ASCII
The ECU has a internal resistor network that does this. It works
this way until it is overcome by an external item, (the O2 sensor).
It was setup this way, for use in contries where there was no
regulations for emissions, hence, they would leave out the O2 sensor
and cat. This is axually the same principle of old TTL logic in computers.
You can simplly achieve this by unplugging the O2 sensor. Will kill your
CAT. in no time.
Eric 86-VW4x4
vw4x4@fyi.net 72-240z
Pittsburgh, PA USA 1936-Chrysler
On Sat, 15 Jan 2000, Lawrence Johnson wrote:
> Kenneth,
> You could disconnect the OXS and plug in a potentiometer with an AA battery.
> By varying the potentiometer, you vary the voltage between 0 & 1 volt. This
> way you could lie to the ECU telling it that the engine is running too lean
> (near 0 volts) or too rich (near 1 volt). Automatically, the ECU would vary
> the FI cycle to enrich or lean respectively. You could connect the OXS to a
> voltmeter and read how rich or lean the engine is really running.
> It ain't elegant but its cheap.
> -Larry
> PS. This would not be kind to your Catalytic Converter
>
> kenneth d lewis wrote:
>
> > David;
> > David;
> > I have given this idea some thought. It should be a pretty simple
> > circuit, a single, adjustable gain, opamp to massage the output of the
> > O2 sensor. Setting the gain below one should enrich the mixture and
> > versa-visa. I would want to install some sort of device to let me know
> > when I am starting to destroy the engine. Maybe an exhaust temperature
> > gauge.
> >
> > Drive Safely & Good Luck
> > Ken Lewis<Kernersville,NC>86 VW crewcab;60 356B Coupe
> > For Sale: 61 AustinHealey Sprite(not Bugeye);Daily driver $2500
> >
> > On Fri, 14 Jan 2000 20:30:13 -0800 David Marshall
> > <vanagon@VOLKSWAGEN.ORG> writes:
> > >I have been toying with the idea of making a black box that would
> > >allow the
> > >driver to control the mixture of the engine. (If you are with the
> > >EPA,
> > >please hit delete!)
> >
> > ________________________________________________________________
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