[Diy_efi] RE: Diy_efi digest, Vol 1 #413 - 12 msgs

[A6intruder]

I understand that the 4-gas gives more info than a WB, but for those that
don't have access to a 4-gas a WB can still be very useful.

Below you discuss that the WB changes as you change timing at a given data
point.  Of course it does, the WB is only reporting what it observes.  If
you change timing from "way-off-rich" to "optimum" you will see the WB
report a leaning A/F trend as it should, you just improved combustion by
changing the timing, not the actual A/F.  Now you will have to decide if
your resulting do have to change A/F again to achieve your A/F goal.

My only point of entering the discussion is for those without a 4-gas not to
discount the usefulness of a WB.  You DO have to understand what it is
actually telling you and tune accordingly.

Thanks for a great discussion thread, this one has been very interesting!

Daniel R. Nicoson
Equipment Exchange Company
Phone:  (814) 774-0888
Fax:      (814) 774-0880

-----Original Message-----
From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org]On Behalf
Of Adam Wade
Sent: Tuesday, December 17, 2002 2:54 PM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] RE: Diy_efi digest, Vol 1 #413 - 12 msgs

--- Dave Dahlgren <ddahlgren at snet.net> wrote:

> Over the last 20 years I have not found this to be
> true at all.

.

> The NTK wide band will read richer with the same
> amount of fuel and if timing is advanced to optimal
> it indicates leaner to the point I am tempted to add
> more fuel.

Which is why I don't use an O2 sensor of any sort for
tuning on a dyno.  While it is a fine toold for what
it is, it cannot give nearly the depth of data that a
four-gas analyzer can.  It won't indicate rich or lean
if the timing is not optimal.  In fact, with training
in what to look for, it is possible to see when a
single cylinder is rich or lean from the rest
(although you cannot tell which one unless you have
probe ports in each runner of the exhaust manifold.

=====
| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
|   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
| "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     |

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