Correct A:F Ratio @ WOT?

[Jon Davis]

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?

TIA,

Jon Davis

----- Original Message -----
From: "Stephen Webb" <swebb at netlab.uky.edu>
To: <diy_efi at diy-efi.org>
Sent: Monday, October 01, 2001 11:19 PM
Subject: RE: Correct A:F Ratio @ WOT?


> gradient") cause lower voltages.  Changing timing can change the
> combustion, and burn more or less of the mixture, leaving less or more
> oxygen in the exhuast.  The "indicated" AFR (inferred from exhuast oxygen
> content) will thus stray from the actual AFR input.
>
> Maybe that's why people say O2 sensor AFR gauges are a poor way to tune.

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