Miatapower List Archive

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Mail From: "Jason Cuadra" <(email redacted)>


I mean, the O2 sensor voltage jumps very suddenly as it goes from slightly
lean to slightly rich, and the rich and lean ends are compressed. There's a
picture way at the bottom of the link below. Moving coil meters by
themselves will swing in proportion to voltage, so by itself, the AF ratio
numbers shouldn't be evenly spaced.

Now if the Westach AF gauge has a "linearizing" circuit, then it's truly
excellent.

fortunecity.com/marina/pontoon/3/miata/fuel_cct/fuel_cct.html


>From: "Ed Cheal" <(email redacted)>
>
>Its marked with A/F ratio, and it does an excellent job of dealing with
>this
>nonlinearity (which is exactly the point). Instead of getting wide swings
>when the ECU is in closed loop at cruise (like you get from "A/F" gauges
>that really are just showing O2 sensor voltage directly), you just get
>*small* wiggles around stoich A/F ratio. Of course, the gauge is just
>converting O2 voltage to A/F ratio, which in reality is a function of
>sensor
>temp (and other variables), so it still isn't the "true" A/F ratio. -Ed
>


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This read-only message was archived from a public mail list.
Mail From: "Ray Ayala" <(email redacted)>


Yes, the analog A/F meter is a lot like the OEM coolant temp gauge in that
it squeezes out that 'unnecessary' region of operation.

----- Original Message -----
From: "Jason Cuadra" <(email redacted)>
To: <(email redacted)>; <(email redacted)>
Sent: Tuesday, January 30, 2001 6:08 AM
Subject: RE: westach af gauge


>
> I mean, the O2 sensor voltage jumps very suddenly as it goes from slightly
> lean to slightly rich, and the rich and lean ends are compressed. There's
a
> picture way at the bottom of the link below. Moving coil meters by
> themselves will swing in proportion to voltage, so by itself, the AF ratio
> numbers shouldn't be evenly spaced.
>
> Now if the Westach AF gauge has a "linearizing" circuit, then it's truly
> excellent.
>
> fortunecity.com/marina/pontoon/3/miata/fuel_cct/fuel_cct.html
>
>
> >From: "Ed Cheal" <(email redacted)>
> >
> >Its marked with A/F ratio, and it does an excellent job of dealing with
> >this
> >nonlinearity (which is exactly the point). Instead of getting wide swings
> >when the ECU is in closed loop at cruise (like you get from "A/F" gauges
> >that really are just showing O2 sensor voltage directly), you just get
> >*small* wiggles around stoich A/F ratio. Of course, the gauge is just
> >converting O2 voltage to A/F ratio, which in reality is a function of
> >sensor
> >temp (and other variables), so it still isn't the "true" A/F ratio. -Ed
> >
>
>
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>
>