O2 sensor idea

[Ken Kelly]

Roger,

The GM PCM only looks at crossings of 14.7 AFM, that is why
they are only calibrated at that point. As soon as you go to
Wide open throttle the PCM ignores the O2 sensor. If the O2
sensor was linear from 14.7 to 12.0 AFR, You could rewrite
the software, so it would stay in closed loop, but it would
be a major rewrite.

		Ken

Roger Heflin wrote:
> 
> Ok, so each O2 sensor varies greatly (even from the same
> manufacturer), so what about taking a wide ratio O2 sensor, and
> rigging a circuit in front of it to make the wide ratio look like a
> normal O2 sensor to the computer?   This would allow the computer to
> work correctly, and also mean that we would be able to properly (and
> reliably) use the O2 sensor for tuning?
> 
> I would thing the circuit would probably need a pic with a D/A and a
> A/D and do a table lookup to properly make a wide ratio look like a
> normal O2 sensor.
> 
>  Thoughs/Ideas?
> 
>                         Roger