O2 sensor bias

[Clare Snyder]

Greg Hermann wrote:
> 
> >>Ok this isn't really true of an O2 sensor, but just pretend for a
> >minute.
> >>What you want, roughly, is an O2 sensor who's output crosses >through
> >the 450mv range at say 16:1 rather than 14.7:1.
> >
> >A question that has remained unanswered in my head for many years now is
> >if the O2 sensor outputs 0.45v at 14.7 mix,  what is the mix ratio when
> >it outputs 0.8v? or 0.9v? or 0.2v?  Does anyone have a graph of a common
> >O2 sensor characteristic of Voutput vs Fuel ratio? I have searched for
> >Bosch data on this but have never seen it.
> 
> Yes I do. In the Accel EMIC Training Manual (don't ask!) on page 1-5 , Fig
> 1.3B presents a graph of the output vs. lambda of whatever Bosch 3 wire
> sensor it is that Accel sells with their EFI kits. "Output voltage switches
> rapidly from 200--800 mv" at lambda =1 (14.7:1). Looking at the graph, the
> output is down to  100 mv by 15:1
> and up to 900 mv by 14.4:1. It is nearly a vertical line between 200 and
> 800 mv, at 14.7:1, as they claim. (The far rich and far lean ends of the
> curve are at 950 and 50 mv, respectively.) Basically, you are playing with
> yourself to try to use a standard O2 sensor to try to control anywhere but
> at 14.7:1 with this  shape output profile.
> 
> On the other hand, I also have voltage vs. lambda output curves for five
> different models of the NGK/NTK 5 wire, wide band O2 sensor controllera.
> With this puppy, you can control to any lambda ratio you want, and they
> show data indicating that it is quick enough to pick up a random misfire
> AFTER the CAT! Unfortunately, retail on one of these is $600 or so,
> including the control box. God knows where to get them at any kind of a
> discount, I don't---maybe one of you does???
> 
> Regards, Greg
Without the box, you can get them from Honda for about $300 US
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                           Clare Snyder
                         Waterloo, Ontario