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Old 03-29-2005, 04:24 AM   #1
bugeyes
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Default differences in o2 sensors

My standalone ecu states it requires a "bosch wide band sensor" and goes on to stipulate bosch part number. Problem is these sensors are dam expansive. The ecu doesnt need the o2 sensor but its an option which allows datalogging and indication of mixture.
The standard subaru sensor is a narrow band I think.
For the purposes of datalogging and adjusting my mixture (a rough guide for mixture). I have connected a multimeter to the signal and it does seem to switch between 0 to 1V.
I admit it may not be as accurate as the wide band but why cant I use it for a rough guide.
What are the differences between sensors apart from some having heaters to get them working quicker on cold starts.
Of course the oem 02 sensor if free as its sitting there now just plugging the hole in the exhaust doing nothing.
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Old 03-29-2005, 10:17 AM   #2
Jon [in CT]
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It'd be helpful to know which ECU you're using and the Bosch part number it wants.
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Old 03-29-2005, 06:46 PM   #3
hippy
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Clicky.... I dunno if your ems can use the less expensive sensor, but you can get a wbo2 sensor for $30. I wouldn't use the stock sensor to try to tune from. It might read downto 12 to 1 a/f ratio(maybe even a little richer), but from what i've heard it was only really ment to be accurate when close to 14.7 to 1.

peace
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Old 03-29-2005, 07:59 PM   #4
bugeyes
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Quote:
Originally Posted by Jon [in CT]
It'd be helpful to know which ECU you're using and the Bosch part number it wants.
I'm running an EMS 8860 ecu. It stipulates it requires bosch wide band sensor part number- 0 258 104 002.
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Old 03-29-2005, 09:43 PM   #5
Jon [in CT]
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Quote:
Originally Posted by bugeyes
I'm running an EMS 8860 ecu. It stipulates it requires bosch wide band sensor part number- 0 258 104 002.
That's a Bosch LSM 11 and you're right, they are expensive and hard to find. They are a very highly calibrated switching 0-1V O2 sensor. I think you should get decent results by using the stock rear 02 sensor on your 2001 WRX, although I haven't read about anyone who's tried that with your EMS 8860 ECU.

The front sensor on a 2001 bugeye WRX is typically mounted in the RH exhaust manifold/collector. It's a widerange A/F sensor that isn't compatible with an LSM 11. It should be removed because it will be ruined if left unpowered in the exhaust stream. If you have an STi and its O2 sensor is mounted just downstream from the turbo in the downpipe, then use that one with your ECU.
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Old 03-29-2005, 09:53 PM   #6
AaronWRX
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sorry for the thread jack...

this looks like a bosch wb02 sensor for 60 bux:
http://store.summitracing.com/defaul...=KeywordSearch

It it really is a Bosch LSU 4.2 I think ill pick up a couple spares.
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Old 03-29-2005, 09:53 PM   #7
Jon [in CT]
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Quote:
Originally Posted by bugeyes
I'm running an EMS 8860 ecu. It stipulates it requires bosch wide band sensor part number- 0 258 104 002.
That's a Bosch LSM 11 and you're right, they are expensive and hard to find. They are a very highly calibrated switching 0-1V O2 sensor. I think you should get decent results by using the stock rear 02 sensor on your 2001 WRX, although I haven't read about anyone who's tried that with your EMS 8860 ECU.

The front sensor on a 2001 bugeye WRX is typically mounted in the RH exhaust manifold/collector. It's a widerange A/F sensor that isn't compatible with an LSM 11. It should be removed because it will be ruined if left unpowered in the exhaust stream. If you have an STi and its O2 sensor is mounted just downstream from the turbo in the downpipe, then use that one with your ECU.

P.S. You should confirm your results with a wideband A/F meter.
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