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Fw: Wide band O2 ????



Thank you sir! 

On the note of how quickly the WBO2 sensors work, I was thinking they would be 
faster, but I just assumed it...  I shall have to look at this very closely, 
perhaps put one on my car, with a hot lead switched with the FI system to 
run...  Did I read earlier in this thread, that I cannot use this on an older 
system, are they compatbile doing it the way that I have written it up here?

TIA

David

Quoting Adrian <adrian.culda@sympatico.ca>:

> Well Wide bands work on a different system than the old narrow band
> sensors.
> They are far more accurate due to the stable operating temperature. Not
> only that but the latency of the narrow band O2 sensor is about 0.5 (~2
> samples/sec.)second compared to the wide band which is 0.03 (~25-30
> samples/sec.)!!!
> 
> How the O2 Sensor Works 
> 
> The oxygen sensor detects oxygen in the exhaust in a way similar to a
> battery cell. Platinum layers on the inside and outside of the probe act
> as electrodes. Zirconium dioxide between the layers of platinum acts as
> an electrolyte. The inside layer of platinum is exposed to the air in
> the engine bay, the outer layer is exposed to the exhaust. When the O2
> sensor is hot it generates positive voltage between the two layers of
> platinum. Negatively charged oxygen ions in the exhaust are attracted to
> the platinum and reduce the voltage that the Engine Control Unit and
> air/fuel gauge reads. 
> 
> That's why a rich mixture = higher voltage from the sensor (more gas =
> fewer negative O2 ions to drop the voltage). Just remember "L=L", Lean =
> Low voltage. You can attach a Volt Ohm meter (black to ground, red to
> the O2 sensor) to monitor your engine's air/fuel ratio. I suggest you
> have a co-pilot read the voltage while you accelerate at full throttle. 
> 
> The 3 wire sensors are used to give power and ground to pre-heat the
> sensor so it starts working quicker and it has no effect after the
> sensor gets warmed up. 
> 
> 
> 
> Adrian C.
> Project Scirocco R2.oT - "The Turbocharged 16Valves of Fire Breathing
> Fury"
> ( 2.0L 16V T66 )
>  
> 
> -----Original Message-----
> From: scirocco-l-bounces@scirocco.org
> [mailto:scirocco-l-bounces@scirocco.org] On Behalf Of
> mr.utility@highstream.net
> Sent: October 24, 2003 11:29 AM
> To: Dan Bubb
> Cc: scirocco-l@scirocco.org; Ron Pieper
> Subject: Re: Fw: Wide band O2 ????
> 
> Quoting Dan Bubb <jdbubb@ix.netcom.com>:
> 
> 
> > 1. control the current to it's heater to maintain the sensor
> temperature in a
> > narrow band despite exhaust heat input (or lack thereof) 
> 
> > Dan
> > 
> > 
> 
> 
> Correct me if I am wrong, but the only time the heater is used is at
> initial 
> start-up, when the sensor is cold?  I was under the impression that that
> was 
> the only time the heater is used, to further diminish emissions when the
> O2 is 
> cold and not yet able to function completely....
> 
> David
> 
> 
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