[Diy_efi] WBO2 and AFR

[Fehn, Ron G]

OK.  how about a 10% ethanol blend gas vs the good non ethanol stuff?
does running ethanol blend result in a richer or leaner reading on WB
and why?  talking EFI here with NB02 sensor input to ECU.
-----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 1:13 PM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] WBO2 and AFR


--- Tim Marsteiner <tmarstei at yahoo.com> wrote:

> As you retard ignition the AFR reading gets leaner!
> If you tune with retarded ignition you will end up
> being rich. This is not insignificant!

*ding*  Give the man a cigar.

An O2 sensor, WB or otherwise, gives partial pressure
of O2 in the exhaust.  Retarding the ignition timing
means less complete combustion (when retarded notably
from MBT), which means more HC *and* more O2 in the
exhaust.  If you're just measuring partial pressure of
O2, then your O2 sensor will "tell" you you just got
leaner, when this is not, in fact, the case.

The key to using data usefully is knowing what they
will (and will not!) tell you.

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| "It was like an emergency ward after a great catastrophe; it  |
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