Adding another O2 sensor

[rr]

Steve,

There may be some additional items to check in your quest for AFR from
BPW. Have you checked the 'raw' bpw values to see how accurate the
diacom software is? The other is the actual bpw itself. A bpw of 2 msec
won't give 2 msec worth of fuel. There is the opening time to contend with.

Food for thought,

BobR.

Marteney, Steven J. wrote:

> I kinda started drawing the conclusion that they were indeed pretty good
> when switching.  It's a rather clever solution to get a non-ideal product to
> work, and work well.  I've been banging on the list about AFR and O2
> inaccuracies thinking that my car is lying to me.  Still investigating.
> Went through all my Diacom data since day 1 and the calculated AFR is
> consistently 12.5:1 +/- 0.3.  The interesting thing is the calculated AFR is
> gradually rising as the gas mileage also rises.  I'm going to attempt this
> weekend to do the same highway test on my friend's bone-stock IROC (with a
> new MAF sensor.)
>
> Still playing!
> Steve
>
> -----Original Message-----
> From: Bruce Plecan [mailto:nacelp at bright.net]
> Sent: Friday, November 03, 2000 2:33 PM
> To: gmecm at diy-efi.org
> Subject: Re: Adding another O2 sensor
>
> They are at least as fast if not more so then the oem ones.
> Remember the ecm is shooting for a 14.7:1  AVERAGE, do it hammers things
> real rich and lean.
> The oem one's ******errors****** is when folks try to read them as a WB.
> They develope cross counts at the same rate as the oems, from what I can
> see.
> At the Powwow we had a scope on the WB and you could see the individual
> cylinder firings, and how they swung rich lean.
> Bruce
>
> > Any comparisons to a wideband to show how GOOD they are at measuring
> 14.7:1
> > in switch-mode?  Are they extremely good at it, or still full of error?
> > Steve
> >
> > -----Original Message-----
> > From: Bruce Plecan [mailto:nacelp at bright.net]
> > Sent: Thursday, November 02, 2000 12:40 AM
> > To: gmecm at diy-efi.org
> > Subject: Re: Adding another O2 sensor
> >
> >
> > IF, all your doing is reading side to side for 14.7:1 comparisons, Sure
> why
> > not.  The oem  sensors are of a switching type.  They are not meant to be
> > WBs.
> > Bruce

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