diy-wb works!

[rr]

The cal resistor varies a great deal on a sensor to sensor basis. Else
we would not have bothered to use it in the UEGO controller circuit.
The sensors vary as much as +- 15% at the end points. The facory
reads each sensor at a rich point and a lean point, then selects the
proper calibration resistor.

Well, I agree, relative to use in leaded fuels: 100 hrs is good. Relative
to unleaded fuels, not so good.

BobR.


Kevin _ wrote:

> My understanding was the production sensors all came with the same cal
> resistor.  The $1000 sensor (or whatever it costs) that is sold to go along
> with the lab-grade boxes like the Horiba (sp?) and the like are individually
> calibrated.  I thought the Honda production version was more generic.  Can
> anybody confirm or deny this?
>
> I'll check through the archives about cal gases.
>
> And what do you mean "kill an O2 sensor about as fast as anything" ?  I
> think 100 hours is a fantastic lifespan for a sensor in leaded gas!  I know
> it doesn't sound like much time, but that makes this sensor one of the
> cheaper parts of maintaining a race car.  I had used narrow-band switching
> sensors in the past just to see if I was rich or lean and then EGT to make a
> guess at A/F.  I never got more than a few hours out of a narrow-band sensor
> in a leaded environment before output began falling.
>
> Kevin
>
> >Actually the sensors are calibrated at the factory. There is a resistor
> >in the connector that is tied into the DIY-WB output circuit. There
> >were some posts listing cal gases that can be used for calibration
> >and testing purposes. And yes, lead will kill an O2 sensor about as
> >fast as anything, except maybe silicone
> >
> >BobR.

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