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Old 01-22-2010, 09:22 AM   #1
Franko
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Chapter/Region: E. Canada
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Default Stock o2 reading concerns.

Ive got a wideband in my other car that I will be borrowing once summer rolls around again and the cars come out of storage. In the meantime last summer I checked out what the stock o2 reads under full load, Its at 11.8.. Now I have heard that the stock o2 is way off and now Im concerned that the engine could be too lean.

I have a keen ear for detonation and I have not heard any. Im always listening for it.

Thoughts on the 11.8 reading on the stock o2?
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Old 01-22-2010, 09:55 AM   #2
quazimoto
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Why don't you just worry about it once you have put the wideband on the car and go by that info? If you search you will find plenty of info on the stock O2 sensor.
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Old 01-22-2010, 01:38 PM   #3
rkramer
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the ecu ignores the stock o2 sensor 100% at WOT. if the ecu ignores it, it is safe for you to ignore it also. (as you figured out, not really accurate outside of closed loop conditions)
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Old 01-22-2010, 07:18 PM   #4
NSFW
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Check this out: http://www.iwsti.com/forums/cobb-str...lots-data.html

However, if you have an aftermarket downpipe with a bung between the turbo and the cat, you can put the stock sensor there. This gets it out of the high EGBP of the up-pipe, and allows it to read much closer to reality. However it still won't read lower than 11.1 or so. I've done this and so have a few other people.

Note that this may only apply to cars with 32-bit ECUs. I have heard that the sensor used by the 16-bit ECUs is the same, but I've also heard that it's different, so I dunno.
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