UEGO and alcohol

[Bruce Plecan]

But, might lull them into thinking timing is a constant.
Yep, your accurate, and that is concise, just when talkinga bout AFR and
multi fuels or changing fuels, timing is an imprtant concideration, and
folks tend to gloss over things some
Bruce


> Yup.  Maybe if people were convinced/coerced into thinking along the lines
> of of "Lambda" values (instead of gasoline A/F values), then the message
> might possibly sink home.  Stoich is stoich, no matter the fuel, in the
> presence of an NTK/NGK sensor.  Lambda = 0.8 is then fairly meaningful to
> the task at hand.......
>
>
> Walt.
>
>
>
> > At 8:29 PM 9/24/00, Jeff Bromberger wrote:
> > >I'm looking to tune WOT w/nitrous and alcohol, so i need something much
> > >richer than stoich. My question is basically whether or not the sensor
> will
> > >reflect the actual ratios of liquid fuel to air or not. Accel claims
that
> > >you need "a true wideband sensor to tune alcohol because it's out of
the
> > >range of the 5-wire sensors like SpeedPro uses"... this is more or less
> what
> > >i was trying to verify. If the alcohol appeared as 6:1 (vs. 12:1 for
gas)
> > >then this would make sense...
> >
> > Maybe if I say it again, you will hear what I am trying to tell you. An
> NTK
> > UEGO sensor will see stoich as stoich, no matter what fuel you are
> running,
> > so long as the fuel doesn't foul the sensor. 14.7:1 is stoich for a
> typical
> > GASOLINE. 6: 1 is stoich for methanol. 8:1 is about where stoich is for
> > ethanol. A UEGO controller, such as EGOR, or the NTK "blue box" will
give
> > exactly the same voltage output at the stoich mixture for any given
fuel,
> > REGARDLESS of whether stoich happens at 14.7 to 1, 6 to 1 or 8 to 1!!
The
> > voltage will vary one way as the mixture goes rich of stoich, and the
> other
> > way as the mixture goes lean of stoich.
> >
> > With methanol fuel, I would bet that a UEGO would work OK down to as
rich
> > as about 4.2 to 1.
> >
> > BUT--if you have a UEGO METER with a digital output---you will get
screwy
> > numbers out of it unless it (the numbers that correspond to a particular
> > output voltage) is recalibrated for whatever fuel is being used.
> >
> > For instance--if you are using a digital UEGO meter which is calibrated
> for
> > gasoline on an alky motor, I would bet on it reading 12.0 to 1 when the
> > mixture was really about 4.9 to 1 !
> >
> > Greg
> > >
> > >
> > >> It's a matter of calibration, Jeff. The sensor/driver/meter will read
> > >> stoich wherever the alchohol mixture is stoich, and rich and lean to
> > >either
> > >> side of it. The only question is--what number will the meter give you
> when
> > >> you are where???
> > >>
> > >> The actual VOLTAGE output from the sensor/driver will be the same at
> > >stoich
> > >> for alky as it would be for stoich for gasoline, etc.
> > >>
>
>
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