O2 / Lambda Sensor Data

[Bruce Plecan]

If you trying to tune a Hi Po engine I suggest you really make an attempt at
reading plugs, not being able to can get really expensive.   Mixture is just
half of what a plug tells you.
Bruce
   To all, save the BW, on the name calling.


From: "Huw Scourfield" <huw.scourfield at lineone.net>
> Bruce, you're an arse ! This guy is giving the list his honest opinion on
> his findings, and all you can do is be condescending. At least I can
> understand what this guy is writing, most of your stuff takes 2 or 3 reads
> to make sense, even the one-liners! Give the guy a break Bruce, not
everyone
> can read spark plugs to .1 AFR, no-one is questioning your experience or
> knowledge, but be a little more understanding , eh?
>     Huw

> From: Bruce Plecan nacelp at bright.net
> Subject: Re: O2 / Lambda Sensor Data
> > > I come from an applied physics upbringing and I know 2 cars is not
> ideal,
> > > but it's better than 1!
> >
> > I fail to see where that is an excuse for giving out poor info..
> >
> >  As long as you keep the sensor roughly at the same
> > > temperature for DIY use I think it's fine, it may not be absolute but
it
> > can
> > > measure the presence of more of less fuel, even off stoichiometric. I
> hope
> > > to get a thermocouple in there soon to monitor the temperature.
> >
> > Might read further and see that backpressure can also play a role.
> > Also, not all sensors switch over at .5v.
> >
> > > I wouldn't know how to read the plugs accurately and the only trouble
is
> > you
> > > can't read the plugs while they are still in the engine :-) One
> advantage
> > I
> > > didn't mention is that the WOT map curve isn't perfectly flat. I guess
> it
> > > takes into account the volume efficiency of the engine. The standard
> curve
> > > shape gave a wobbly mixture across the range(read from the mixture
> meter),
> > > we re-shaped the curve to give a constant mixture reading throughout
the
> > rev
> > > range.
> > >
> > > I'll be the first to admit I don't know the ins and outs of engine
> tuning.
> >
> > And you want to give advise?.
> >
> > > I'm just a evening hobbyist, but the car feels better now, and
hopefully
> > > will give a few more ponies at the rolling road (at 60quid a throw I
> can't
> > > afford to tune it on the rolling road itself, and besides it fun to
have
> a
> > > go yourself)
> >
> > And remember, Buttometer readings are meaningless.
> > Bruce
> > >
> > >
> > > Will
> > >
> > > P.S. I've searched the archives, there is lots of info and I learnt a
> lot,
> > > without the people on the list I wouldn't have got to this stage, I
just
> > > thought I would put some hand on experience back.
> > >
> > > -----Original Message-----
> > > From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> > > Behalf Of Bruce Plecan
> > > Sent: 25 April 2001 22:31
> > > To: diy_efi at diy-efi.org
> > > Subject: Re: O2 / Lambda Sensor Data
> > >
> > >
> > >
> > > 2 cars is hardly enough to start making universal generalizations.
> > > If you would care to read the archives you'll find out alot more about
> > them.
> > > If you repeated your experiments by reading the plugs you'd have saved
> > more,
> > > and been more accurate
> > > Bruce
> > >
> > > <snip>


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