Are A/F ratio gauges junk.
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This is a discussion on Are A/F ratio gauges junk. within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; I was going to get one but had to people tell me they are very reliable....

  1. #1
    Registered User bigwrxguy's Avatar
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    Are A/F ratio gauges junk.

    I was going to get one but had to people tell me they are very reliable.

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  3. #2
    Registered User rpfride's Avatar
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    Reread youre thread. Youre question doesnt make sense.
    But ,most, a/f gauges for the wrx do not work well/unreliable/inaccurate (ig,autometer) b/c you need a wide band O2 sensorfor the rex.
    They are not "junk" and infact are one of the more important gauges one should have. You just have to spend alittle $ to get a good one.

  4. #3
    Registered User bigwrxguy's Avatar
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    I was going to get a A/F gauge but had two people tell me they are not very reliable.

    I must have been on crack when I wrote the first post.

  5. #4
    Registered User Quack's Avatar
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    Quote Originally Posted by bigwrxguy
    I was going to get a A/F gauge but had two people tell me they are not very reliable.

    I must have been on crack when I wrote the first post.
    if you are to get a A/F guage, get a wideband.

  6. #5
    Registered User cail's Avatar
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    If you want it to be reliable, you need to get a wideband A/F meter like Quack said (to plug it on the front oxygen sensor).

    If you get a narrow band A/F meter, you will need to plug it on the rear oxygen sensor and the reading won't be as good as it would be with the front sensor.

    Or you can do like me and build your own meter...taking the signal from the front oxygen sensor....total build cost...less than 20$

  7. #6
    Registered User Quack's Avatar
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    Quote Originally Posted by cail
    Or you can do like me and build your own meter...taking the signal from the front oxygen sensor....total build cost...less than 20$
    details...

  8. #7
    Registered User cail's Avatar
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    The signal coming out of a narrow band oxygen sensor is 0-1V
    The signal coming out of a wideband oxygen sensor is 0-5V
    This is the reason why you can't use the wideband sensor with a normal A/F meter.

    The signal from the wideband oxygen sensor goes into the ECU on the connector B137 on pin 19 (the wire is white and the B137 connector is the bigger)

    So, knowing where the signal is, it was easy to read it.
    I took a LM3914, which is a DOT / Bar display driver. (
    HTML Code:
    http://cache.national.com/ds/LM/LM3914.pdf
    )
    I did some modifications to the circuit on the page 2.
    It's working fine. I wait for a fiberglass plate to insert it under my radio
    HTML Code:
    http://public.fotki.com/cail/divers/dvc00525.html
    This is only the circuit. I'll post pic of the final product as soon as i get my plate

  9. #8
    Registered User cail's Avatar
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    here is the final product

    A/F meter

  10. #9
    Registered User Racenut's Avatar
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    Nice job

    Looks like a fun project.

    So you just tapped into the factory O2 sensor right?

  11. #10
    Registered User cail's Avatar
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    Quote Originally Posted by Racenut3.0
    Nice job

    Looks like a fun project.

    So you just tapped into the factory O2 sensor right?
    Right...even if some people say it is not accurate

  12. #11
    Registered User Racenut's Avatar
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    Well, an LED indicator isn't exactly accurate, but I'm not going to use it for tuning, just would like to have some way of knowing if things get a little stupid

  13. #12
    Registered User boosted scoob's Avatar
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    Quote Originally Posted by cail
    The signal from the wideband oxygen sensor goes into the ECU on the connector B137 on pin 19 (the wire is white and the B137 connector is the bigger)
    Do you know the signal wire for the narrow band o2 sensor (rear one)? Will a regualr 0-1V o2 sensor work exactly with the rear o2 sensor?
    02 WRX - XS Power header/UP/TBE, XS Power FMIC, MBC@15psi, Ported TD04L, Perrin shortram, Alum Radiator - 13.35@101
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  14. #13
    Registered User bjbrad85's Avatar
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    Just wondering if you heard that A/F gauges (like the ones in boostedscoob's avatar) were unreliable or, all A/F gauges in general, including needle style ones. Im considering a defi d-series A/F gauge (needle style) in my GVR4 so like you, Id rather not spend the $$$ on something thats going to turn out being cosmetic. Sorry, dont mean to hijack
    Hey baby, wanna go pick up some groceries?

  15. #14
    Registered User WRXcelration's Avatar
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    any gauge is better than no gauge
    05 STI

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