A/F ratio gauge
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This is a discussion on A/F ratio gauge within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; Hey sorry i'm a newb, but i just bought an 02 wrx and it came with an apexi auto timer ...

  1. #1
    Registered User
    Join Date
    Mar 2006

    A/F ratio gauge

    Hey sorry i'm a newb, but i just bought an 02 wrx and it came with an apexi auto timer (turbo timer). I was just wondering how to acurately read the information that it gives. When i'm on the A/F/ O2 mode it gives number between .2 and .95 and i was wondering what they meant. When its on the A/F it gives numbers like 14.6 or something. So if anyone could help me with the interpretation, like what are normal readings and what do they mean, that would help. Sorry if this is the wrong forum to post this in. Thanks.

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  3. #2
    Registered User Kush's Avatar
    Join Date
    Mar 2006
    Westchester, New York
    I could be wrong, so someone correct me if I am, but I believe those o2 sensor readings are measuring voltage. It should fluctuate for a few minutes from around .3 to around 1 volt while it's still in open loop after you start your motor, and then level out to .3-.6 after everything warms up and it enters closed loop (after the engine heats up). Anywhere from .3 to .6 is normal in closed loop, anything below .3 is pretty lean, above .6 is pretty rich.

    "ideal" a/f ratio is 14.7:1, but different manufacturers run their cars differently, some even as lean as 16:1 - not sure what subarus usually read. Probably anything around 14-15 is alright.
    Last edited by Kush; 03-19-2006 at 05:06 PM.
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