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The Truth About A/F Ratio Gauges

Discussion in 'ECU's, Electronics, and Tuning' started by PBE9699, Oct 6, 2003.

  1. PBE9699

    PBE9699 Member

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    Ok I've been hearing a lot of things these days about A/F Ratio Gauges. People have been telling me don't buy an AutoMeter gauge because its all fancy display and flashing lights and they lie anyway. They say at wide open throttle instead of reading the actual input from the sensors it simply displays the data from the fuel map in the ECU; something about a closed loop circuit being responsible. They also say the most accurate A/F Ratio Gauge that uses stock sensors is the GReddy... is this true?
    To all the Electronics Gurus out there please help me. I'm going to buy one of these babies and I need to know which is the best to buy. Thanks for all Feedback
     
  2. CRX-YEM

    CRX-YEM Super Moderator Moderator VIP

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    if your looking for dead nuts real most accurate data from an A/F gage then the only one you should be looking into is a wideband O2 sensor.

    if you're looking to get kinda an idea , a half ass estimate than go the cheap route and spend $35 on the Autometer gage, at best it will give you a very rough estimate that if under hard throttle if your rich or lean.
     
  3. PBE9699

    PBE9699 Member

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    Hmmm I heard that The Wideband O2 sensors are HELLA expensive and the sensor doesn't last very long as its usually used for dyno tuning and not meant to keep on your car all the time... how true is this? Well anyway I also heard that a better way to ascertain your A/F ratio is buy using an EGT gauge... how true is this? And if so how does it work? I'm guessing the Hotter your EGT's the richer the ratio is?
     
  4. PBE9699

    PBE9699 Member

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    If I do Decide to buy and EGT gauge, which manufacturer should I go with? AutoMeter, GReddy, HKS... ? All opinions welcome
     
  5. PBE9699

    PBE9699 Member

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    Anyone else out there care to shed some light on this topic?
     
  6. pills_PMD

    pills_PMD Super Moderator

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    get a VX wideband

    there was a guy on H-T who made kits a while back
    i dont know if he still does.. do a search there for "VX wideband"
     
  7. AllMotorMonster

    AllMotorMonster Senior Member

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    1- Aftermarket A/F ratios are limited in that they only read what the ECU is reading up until the ECU goes in to closed loop where the A/F gauge then reads max. Since stock 02 sensors are not good for tuning compared with wideband 02 sensors.

    2- EGT's are great if you know HOW to read what you're looking at.

    3- Wideband 02's such as Tech-Edge and FJO are somewhat costly and true, they should not be run at all times.

    If you're looking for a cute light that goes blink blink, buy a autometer or whatever....

    If you're looking for a great TUNING tool that will be used from time to time, invest in a good wideband 02 sensor and display kit.
     
  8. liquid00meth

    liquid00meth Senior Member

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    EGTs heat up when are you running lean, not rich, by the way.
     
  9. kell211

    kell211 Member

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    isn't it possible that running rich can heat up exhaust? if you have unburnt gas left in the combustion chamber, wouldn't it then get ignited or partially ignited on the way out the exhaust. therefore uping the temp?
     
  10. AllMotorMonster

    AllMotorMonster Senior Member

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    Negative ghost rider.....


    Lean = Hotter

    Rich = Cooler
     
  11. PBE9699

    PBE9699 Member

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    Thanks for all the Info guys, i think i'm going with the cheaper yet more accurate route, The EGT gauge... which would you fellahs recommend? i hear the GReddy is pretty good. And can anyone give a crash course in interpreting the EGT gauge?
     
  12. radnulb

    radnulb Senior Member

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    FWIW, the newest generation of widebands that use the Bosch LSU4 sensor are worth considering as a long-term solution. The LSU4 sensor can be had online for ~$35, making it cheaper than a OEM 4wire from autozone (at least around here).

    http://www.pgmfi.org/phorum/read.php?f=5&i=3700&t=3700 for more discussion of new options available.
     
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