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  1. #1

    anyone with a MTX-L A/F gauge?

    im running like 13.4 at WOT???? Why when you calibrate it read O2 @ 22.4 shouldn't it be 21.0??? Im running a C3 with R1 where should my A/F be? I was thinking low 12's high 11's. Is there something that needs to be programed on this gauge????


  2. #2
    dhoad's Avatar
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    22.4 is the right number when free air calibration.
    13.4 is too lean at WOT. should be in 11.8-12.2 range to be safe if you are running extended periods at WOT

  3. #3
    Why would I be so lean with R1 and C3?

  4. #4
    dhoad's Avatar
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    Quote Originally Posted by gashog301 View Post
    Why would I be so lean with R1 and C3?
    Don't know why you would be lean but I would call RD and ask. Seems like the R1 is designed for 8450rpm and c3 wheel.
    What RPM are you seeing 13.4? Perhaps if you are 8450 the ECU is pulling fuel as you are at the limiter.

  5. #5
    mjh3ides's Avatar
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    Yep, it looks like that's how that gauge reads when calibrated. I wonder why it defaults to the upper limit instead of showing an actual reading (should be 20.9)?

    Again, the display should ‘sweep’, but instead of an error, the display will display
    “Htr”. This indicates that the sensor is being heated up to operating temperature.
    After 30-60 seconds, the display will switch from “Htr” to “CAL”, indicating that the
    sensor is being calibrated. A few seconds later, your MTX-L will begin displaying
    AFR. Since the sensor is in free air, the gauge will default to the upper limit of 22.4.
    The calibration procedure has completed and the system is now ready for use.
    http://www.innovatemotorsports.com/s...Manual_1.1.pdf

  6. #6
    Not on limiter at all, just over 8000rpms and about 11psi of boost.

  7. #7
    OK talked to glen at R/D, going to send ecu back and get a R3. He said it works much better with the C3. I just wish I knew that from the start.

  8. #8
    dhoad's Avatar
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    Quote Originally Posted by gashog301 View Post
    OK talked to glen at R/D, going to send ecu back and get a R3. He said it works much better with the C3. I just wish I knew that from the start.
    Good choice, the acceleration with the R3 is great and the fueling map is almost enough for the ET 15.5 wheel running with safe AFR till 8300

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