EGOR

[Bruce Plecan]

Personnally, I like the idea of continuos (as fast as possible sampling)
data logging of the WB,  if you can display it in scope fashion, then you
can identify if there  is a lean or rich cylinder,  not which one, but
knowing there is a problem will lead you to an answer.
   ie, if you see the above pull one plug wire, repeat the datalogging, and
then you probably could go thru the firing order to see where the problem
lays.
   Part of what is so neat with the BW is so far it looks to be totally
independent of where it is in the system.  Being indepenent of exhuast heat
is the key here.   thou when being used for ecm controll I would mount it
close to the oem location incase the ecm is looking for a timed feedback on
injector PW changes.
   Bruce



> Using an O scope on Bruce's WBO2, which was mounted at the end of the
tailpipe, we
> were able to see cylinder to cylinder O2 variations in the exhaust stream.
By
> increasing the sampling rate of the scope, we were able to watch the
overall trend
> of the individual cylinders as they travelled from rich to lean across the
standard
> O2 sensor's threshold voltage.  If the expensive meter you saw displays a
flat line
> at any point, my limited experience leads me to believe the display
reflects a
> filtered or averaged sensor signal.
> Shannen

> Richard Wakeling wrote:
> > Hi Bruce,
> >     When you were testing your WB prototype, where did you have the
sensor
> > placed?  Was it at the end of the tail pipe? When you are in closed loop
was it
> > able to display the typical rich/lean oscillations?   The reason I ask
is about
> > a week ago I had the opportunity to have a look at one of the Aussie WB
so
> > called professional Uego meters. Cost about $3500 inc GST. The guy I
spoke to
> > was telling me how accurate their tool was and said that it sampled 21
times per
> > second.
> >     What puzzles me is he was very happy to point out that at 14.7:1
(closed
> > loop) his display would show a nice straight line meaning for him his
tool was
> > displaying the correct result. I would of thought that if they had gone
to the
> > trouble of sampling 21 times per second we should see some oscillation
during
> > closed loop. He could not explain to me a satisfactory reason and I am
still
> > puzzled. One explanation was that because he had the sensor at the tail
pipe any
> > oscillations would be lost. Does this mean that his tool is not capable
of
> > detecting quick lean transitions that normally would be displayed on our
factory
> > O2?
> >     Question to all you people who use, own WB meters. What do you see
during
> > closed loop mode at the tail pipe?
> > Cheers Richard.

> > Bruce Plecan wrote:
> > > Got one right here.
> > > One of the prototype, first 3.
> > > Ran it in parrarel, with a NTK WB and was at least as good.
> > > The Bare unit is very fast responding.  Using a scope actually gave
the best
> > > results for steady state viewing.   I'm using a slow sample rate DVM
for in
> > > car work.   Was easy to see the individual cyl firings at 3K rpm..
It also
> > > was real close to the commanded AFR the ecm was seeking, in my GN
(under
> > > boost even <g>).
> > > There is an update (to the wiring), and continuning work on it.   Thou
at
> > > this time, just limited to 2 people.
> > > No boards yet.
> > > As I recall, paying premium prices for all the bits was $35.
> > > > Has any one built this wide band EGOR unit and has any feedback to
how
> > > well
> > > > it works?
> > > > What do you estimate the total cost of parts would be to build it?
> > > > Did you build all in house or did you send out some of it to be
> > > fabricated:
> > > > the board, etching, etc.
> > > > Thanks.
> > > > Steve

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org