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Old 10-18-2000, 09:59 AM   #1

Member#: 922
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
16 WRX (white)
04 FXT (red)

Post Wide-band A/F Guages?

I called Autometer and they don't make anything. From my understanding the wide-band O2 sensor operates in the 0-5V range versus the normal O2 sensor range of 0-1V.

Now theoretically you could make something to cut the voltage in 1/5th going into a guage and this should result in the same reading as a normal O2 sensor, right?

The only problem this may cause is less voltage being read by the ECU, but I'm not positive on that one since I don't know electronics too well.

Also for those of you interested, I found <a href="http://www.students.tut.fi/~eppu/dev/EGO-bar.html" target="_blank">this link</a> in an old thread explaining how to make your own A/F ratio meter with simple electronics. Makes me wonder if there isn't a chip out there to do the same from 0-5V as that one does to 0-1V.

BTW, my point behind this thread is wondering if there are pre-made guages for us wide-band O2 people that don't cost an arm and a leg.

[This message has been edited by 8Complex (edited October 18, 2000).]
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Old 10-18-2000, 10:25 AM   #2
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Join Date: Aug 1999
Location: New York
2004 Forester XT
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So in theory, if I connect a resistor that decreases the voltage by 80% inline to the A/F meter, my meter should work. Correct me if I am smoking crack again.

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Old 10-18-2000, 10:44 AM   #3
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Join Date: Jun 2000
Location: Austin, TX
2008 STI


Since this issue is coming up again, let me repost this thread: http://www.i-club.com/ubb-files/Foru...ML/003366.html

If you guys have any ideas on the results, please let me know.
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Old 10-18-2000, 11:51 AM   #4
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Location: Markham, Ontario, Canada
1994 Legacy Turbo


I posted that link to http://www.students.tut.fi/~eppu/dev/EGO-bar.html a couple of days ago. You can use the same National Semiconductor LM3914 for a 5 volt signal. In fact, the ciruit diagram is given in the LM3914 data sheet (http://www.national.com/ds/LM/LM3914.pdf) on page 2.

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