[Diy_efi] WBO2 and AFR

Fehn, Ron G RFEHN
Wed Jul 6 18:36:51 UTC 2005


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.

| 82 Honda CX500 Turbo (Cassandra)  90 Kwak Zephyr 550 (Daphne) |
| "It was like an emergency ward after a great catastrophe; it  |
|   didn't matter what race or class the victims belonged to.   |
|  They were all given the same miracle drug, which was coffee. |
|   The catastrophe in this case, of course, was that the sun   |
|     had come up again."                    -Kurt Vonnegut     |
| M/C Fuel Inj. Hndbk. @ Amazon.com -  http://tinyurl.com/6o3ze |

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://lists.diy-efi.org/mailman/listinfo/diy_efi
__________________________________________________________________
If you do not want to receive future unsolicited commercial email 
advertisements or promotions from American Family you may opt-out
by visiting the following website:
<https://www3.dncsolution.com/SSL/DNESolution/OptOutCode/OptOut.aspx?el=5 >
Note: After opting-out, you may receive emails that you have
specifically requested from American Family.  If you are a current
American Family customer, you may still receive transactional emails
regarding your existing policies or accounts with American Family.
American Family Mutual Insurance Company and its affiliates utilize
the PossibleNow DNESolution to administer this email opt-out process.




More information about the Diy_efi mailing list