[Diy_efi] WBO2 and AFR

[Fehn, Ron G]

Gary:  new to this stuff.  pulse width = the time injector is open?  is
that correct?  so on my WB is see 14.3 in CL on 10% ethanol.  i will
assume lambda is then reading = 1.0.  correct?  the NB 02 adjusts A/F to
stoich or lambda 1.0?  if i run non oxy fuel nb02 will adjust A/F to
14.7 and that is what i "should" see on WB and lambda 1.0?  so injector
PW will change based upon what fuel per the feedback from NB02 to ECU.
now in my tuning program i can adjust my "constant" for stoich to a
range.  it was set at 14.7.  should i set it 14.2 for 10% ethanol fuel
which i run?  anyone comment.  correct my errors!

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
On Behalf Of Adam Wade
Sent: Wednesday, July 06, 2005 11:00 PM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] WBO2 and AFR


--- gary <gas- at charter.net> wrote:

> Trick question.  It is of no consequence, as you
> would tune using Lambda.

That wasn't the question, however.  The question was,
with the same pulse width, what would an O2 sensor
read comparing the two fuels.  It would read leaner
with the same pulse width using 10% ethanol blend, as
the partial pressure of the oxygen would be higher. 
No one said anything about tuning.

Do all fuels have the exact same partial pressure of
oxygen at lambda=1?  I would suspect this is not the
case, and the further you got from lambda=1, the less
sure you could be of your AFR from taking an O2 sensor reading.

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