Correct A:F Ratio @ WOT?

[Bruce]

Why not just run open loop?.  then pick the AFRs you want to run.
Might wind up being alot easier then what your looking to do.  Some of the
ecms are real picky about transistion times, and expected changes for BL
changes.

BTW, not all cars run at 14.7:1 in closed loop.

There are reasons for GM to inventory 100s of O2 sensors.  If they were so
simple and universal, one would work for everything
Bruce





From: "Jon Davis" <jfdavis at epix.net>
Subject: Re: Correct A:F Ratio @ WOT?
> I don't want to measure the output of the O2... I can do that with my DMM.
I
> am going to make a circuit that adds an offset to the output of the sensor
> to tell some lies to the ECU. I wanted to know the esr so I could make the
> output of my offset circuit mimic the sensor better. Guess I'll just shoot
> for 100k and call it good enough. When I measured the output of my O2
during
> closed loop cruise, the average was .56 V which seems a little rich.
> Jon Davis

> ----- Original Message -----
> From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
> To: <diy_efi at diy-efi.org>
> Sent: Tuesday, October 02, 2001 4:50 AM
> Subject: Re: Correct A:F Ratio @ WOT?
>
>
> > Jon Davis tapped away at the keyboard with:
> > > I have wondered about real vs. indicated AFR... some mods on my
> > > car seem to do real well for about a week, but the power slowly
> > > disappears over time. I wondered if I was changing the combustion
> > > and screwing up the self-learn in my ECU. I thought about making a
> > > circuit with a variable offset on the O2 sensor, to tell some fibs
> > > to the ECU and see what happens. Anyone know the esr of an oxygen
> > > sensor offhand, around 100k?
> >
> > It may be "broken" if you try to run a resistance measuring current
> > of any magnitude through it for any length of time.
> >
> > One measures the output voltage into a high impedance (>1Mohm).
> > The ECU is probably looking for the switching voltage about 0.45
> > volts, which is equivalent to stoich.
>
>
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