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Old 07-19-2002, 06:28 PM   #1
Scooby Guru
Member#: 15543
Join Date: Feb 2002
Location: san francisco, ca
90BJ Legacy LS ABS
AWD 946 Rio Red Jpn built

Default High resolution or wide voltage range O2 sensor?

I dont see much mention of this but I have had this mod in my head on my list of todo items. Now its getting close to the time that I actually start installing some of this stuff. Heres my question

Ive been thinking about getting a 5 volt oxygen sensor, subaru oem or aftermarket, and having an exhaust shop add a mounting location for it. I would then power it and buy a meter for it so I could tune the car and monitor the ratio without effecting the ECU or using the somewhat limited low voltage model that is stock on most older subaru.

What would be the best option cost wise for the sensor itself?

Who makes a 5 volt A/F meter? Im not into looks. Smaller the better. Actually if someone could post specs Id rather just use a volt meter!

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Old 07-19-2002, 07:18 PM   #2
Bob O
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Member#: 1502
Join Date: May 2000
Chapter/Region: MAIC
Location: Felton, PA, USA
2000 2.5RS & SV1kS


This has been kicked around before, but I think the wide band sensors are not simply wider band, at least in terms of 0-5V being larger than 0-1V. At least from the Subaru manual the signal curve from the wideband sensor on the 00's, is all about current vs a/f. I'm not sure on the specifics but almost all wideband meters are super expensive, like 1k (the one from Blitz comes to mind). I can't figure out for the life of me what voodoo they are doing in those boxes to come up with costs like that. Now if you could get a signal to a/f response graph with numbers on it (the Sube manual graph has no #'s) you could easily track the important signal info and correlate it to a/f. IIRC no one has done this cheaply yet.

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Old 07-19-2002, 10:52 PM   #3
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Join Date: Aug 2000
Location: Spokane, WA

There are two DIY WB-O2 projects that I know of. Both will cost <$200 total, including the sensor. Check out http://www.diy-efi.org/diy_efi/projects/diy_wb/ and http://www.techedge.com.au/vehicle/wbo2/default.htm. The second one also has a provision for connecing a LCD to show the current A/F ratio. These are just as good as the Blitz or any other meter(same sensor, in fact).

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