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Thread: AFR

  1. #1
    spouk3's Avatar
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    Question AFR

    Hi guys,

    Sorry, another thread about AFR but can't find the info... I am running a V-Tech reflash (8375 AGR 402) on my RXT-260 2012 ...

    Can someone give me AFR range I should get... I have a FPR set at 58 PSI ... Here's the info I found.

    IDLE: ~ 12.5
    MID: ~ 13.5 - 14.0
    WOT: ~ 11.7 - 12.2

    Is this correct? V-Tech says I need 14.0 - 14.7 at IDLE ... I'm confused...


  2. #2
    actually 13-5, 14 is ok on idle.
    If you stay at 12.5 then you can have start issues and take off issues, plugs go bad.
    Its very easy to change this in the editor.
    Just reduce fuel a bit in the idle area.

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    imp0ster's Avatar
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    14 to 3.5k rpms, slope down to 13.5 by 5000rpms and continue the slope down to 13 by 6k then end up at 12.2 @ 8300 with an X-SC

    pull 4% below 2k and go from there

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  6. #4
    spouk3's Avatar
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    Quote Originally Posted by imp0ster View Post
    14 to 3.5k rpms, slope down to 13.5 by 5000rpms and continue the slope down to 13 by 6k then end up at 12.2 @ 8300 with an X-SC
    So IDLE at 14.0 14.7 is OK.

  7. #5
    imp0ster's Avatar
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    Quote Originally Posted by spouk3 View Post
    Quote Originally Posted by imp0ster View Post
    14 to 3.5k rpms, slope down to 13.5 by 5000rpms and continue the slope down to 13 by 6k then end up at 12.2 @ 8300 with an X-SC
    So IDLE at 14.0 14.7 is OK.
    I'd keep it between 14 and 14.5. I ran 14.5 at idle and droped to 14 by 5k with my X

  8. #6
    imp0ster's Avatar
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    BTW looking at an AFR gauge is not too accurate. You could be catching a blip of this AFR or that AFR. You need to be reading a log so you can see and track true AFR vs throttle then make an accurate decision on where to pull or add fuel

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    spouk3's Avatar
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    Yeah, I know ... But it looks like you can't connect the 0-5v from my MTX-L to the V-Tech Datalogger at the moment ... And I don't want to always disconnect my O2 sensor from the gauge because of the calibration process...

  10. #8
    imp0ster's Avatar
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    I'm in the same boat but until you know your tune is spot on you need to be using the datalogger.

  11. #9
    spouk3's Avatar
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    Why each time I start a new thread on this forum I end up with -500$ in my wallet :P LOL

    I should order the datalogger and leave my O2 Sensor on the datalogger until there's a way to connect the 0-5v ... V-Tech was saying it's a matter of software...

  12. #10
    spouk3's Avatar
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    I have another question, can I adjust the Idle afr on the hose? If not why?

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