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

Programmer nwester at eidnet.org
Wed Dec 18 19:19:22 GMT 2002


Having never actually used a wideband (we're 4 gas equipped shop and
eddybrake dyno), I couldn't tell you the difference. Being able to watch CO
and HC does have it's advantages--and I really love tuning on my eddybrake
machine. The nice thing about the Sun450 is not only the AFR curve, but you
can watch everything graphically as you're on the dyno. I don't like the
time lag, but I also don't tune in real time--that'd put the drivetrain and
engine under unnecessary loads at WOT. There's a lot of values you have to
keep an eye on when tuning...and I honestly don't see how you can do a good
tune on an inertia machine--but that's just me. If I had an inertia
dyno--I'd have to learn to tune with it, right ?

Lyndon ; )

----- Original Message -----
From: "A6intruder" <A6intruder at adelphia.net>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, December 18, 2002 7:35 AM
Subject: RE: [Diy_efi] RE: Diy_efi digest, Vol 1 #413 - 12 msgs


>
> 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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