NB-O2 sensors suck! was Re: another wiring question

[jtoomasson at yahoo.com (Jeff Toomasson)]

Dan B. - does NB = Normal Band (as opposed to Wide Band...)?

thx, JT
----- Original Message ----- 
From: "Dan Bubb" <jdbubb@ix.netcom.com>
To: "Drew Teague" <roccnroll@hotmail.com>; <scirocco-l@scirocco.org>;
<sad_rocc@yahoo.com>
Sent: Thursday, May 15, 2003 11:31 AM
Subject: NB-O2 sensors suck! was Re: another wiring question


> Let me rephrase:
> It's only accurate at stoichiometric.
> It's informative about whether your engine is running rich or lean.
> It's useless at telling you how rich or lean. i.e. neither accurate nor
> precise more than a couple tens of an A/F ratio away from stoichiometric.
> The last line is just my opinion although it is a commonly held opinion
> among those tuning aftermarket EFI. As an example, it would be a bad
mistake
> to attempt to tune a turbo engine using just a standard NB-O2 sensor!
> Dan(the other Dan)
>
> ----- Original Message -----
> From: "Drew Teague" <roccnroll@hotmail.com>
> To: <jdbubb@ix.netcom.com>; <scirocco-l@scirocco.org>;
<sad_rocc@yahoo.com>
> Sent: Thursday, May 15, 2003 2:03 PM
> Subject: Re: another wiring question
>
>
> > >Also, you shouldn't expect too much as far as accuracy from this gauge.
> It
> > >will accurately tell you if you're at stoichiometric or whether you are
> > >rich or lean, but it really will give you no idea HOW rich or lean. As
an
> > >example, if you were running open loop and at 15.5:1 while cruising
down
> > >the highway (which the engine would be totally happy with) the gauge
> would
> > >indicate dead lean. Very little accuracy on the lean side and not much
> > >better on the rich side.
> > >Dan (the other Dan)
> > >
> >
> > So, in other words, it _is_ very accurate, just not *precise*  :)
> >
> >
> > **Drew Teague**
> > Harrisburg, PA
> >
> > '84 8v Rocco --  "Bruise"
> > '85 BMW 318i
> >
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>
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