Wideband O2 sensor placement

[S2central.net]

Found this tonight while doing some hunting...

http://wbo2.com/lsu/lsuinstal.pdf

Interesting recommendations for turbo'd cars - see point 4 on page 2.

Are they being really fussy about this ?

I know plenty of people who have fitted WB-O2 sensor in location of factory lambda probe but not heard of any great issues resulting from that.

[EspenW]

Found this tonight while doing some hunting...

http://wbo2.com/lsu/lsuinstal.pdf

Interesting recommendations for turbo'd cars - see point 4 on page 2.

Are they being really fussy about this ?

I know plenty of people who have fitted WB-O2 sensor in location of factory lambda probe but not heard of any great issues resulting from that.

Stock location is not a good idea. Possible heat damage, shortened life and possible flawed readings. I had the bung welded in at the inlet of the driver side CAT.
Also, by keeping the narrowband, you can keep an eye on the calibration of the wideband, as it should fluctuate around 14.7:1 at low load.

[dubmeister]

turbo'd cars - see point 4 on page 2.

Always been told to fit wideband on turbo motors further down the pipe, have seen quite a few widebands fitted in the stock location that have been fooked by heat......
VW 1.8ts use a narrowband before and a wideband after the cat................

[Rocco]

narrowband and wideband.... ,one day i will understund perfectly wich it´s the meanig translated to Spanish

[Smiley]

Stock location is not a good idea. Possible heat damage, shortened life and possible flawed readings. I had the bung welded in at the inlet of the driver side CAT.

Is there enough space to mount the probe vertically? Is it possible to mount it further away (way front heading turbo) somewhere on the single pipe? or in the Y?

[Rusty]

D'oh! Just had a separate bung welded in near the OE position.

[EspenW]

D'oh! Just had a separate bung welded in near the OE position.

No problem, get an Innovate HBX-1 bung extender. That will keep the sensor much cooler

[S2central.net]

'Bung extender' - tremendous !

[Nj]

Rocco - don't worry, I haven't a clue what's happening in English

[Rusty]

No problem, get an Innovate HBX-1 bung extender. That will keep the sensor much cooler

Erm, just did a quick search, 80GBP, surely not?

[Jamo]

It costs $89 so seems a bit steep!

[Rusty]

Suppose if it doubles the life of the WB02 then it pays for itself. Still a bit of a rip off tho for some machined metal. Shame I'm not at work, could have made a few of those for nice price.

[S2central.net]

To clarify...

The narrowband lambda sensor is what our cars gave from the factory. It gives the ECU a useful indication of oxygen content in the exhaust as a means of determining how lean or rich the mixture is. This type of sensor has a fairly limited sensitivity - it is good enough for ECU to perform mixture adaptation - but doesn't have quick enough response time and behaviour for a real-time air fuel ratio (AFR) measurement. This is why the 'wideband' O2 sensors exist - they offer greater accuracy for AFR measurements... Some types are now used on new cars for more exotic ECU, but it is this type of O2 sensor we need for monitoring AFR.

Some WBO2 sensors (or their controllers) provide an output to the ECU which simulates the signal from narrowband/factory sensor - this is useful when fitting WBO2 sensor in the location used by the factory sensor - which is what started me to consider if that was ideal.

[Jamo]

Slow2 runs a wideband sensor with a narrowband output to the Motronics ecu with no problems.

[S2central.net]

Thats on Zeitronix - works well... Also is controllable if you want to skew the narrowband reading into the ECU so that it modulates around a slightly leaner or richer AFR if you wish... WIth care you could run slightly lean at cruise all the time and save buckets of fuel... I mean slightly lean - like running at 14.8 or 14.9 instead of 14.7 - thats unlikely to cause any nasty effects on the engine but would result in saved fuel. At WOT this signal gets ignored of course and so we want nice richness for good power. I *really* like the Zeitronix setup because of this potential - it could pay for itself rather quickly - in theory anyway.