EGOR

[Shannen Durphey]

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
> >
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