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  1. #1

    AFR for dummies, help please....

    Some of you may have read through my winter mods project, but I'll quickly give you an overview.

    I have a 2012 RXT-X260 aS that I am fitting;

    Vtech 8350 tune
    Riva 4" air
    Riva FPR
    Catch can
    removal of intake arrestor
    Gen3
    SRZ 15/21a
    SS wr
    New Riva grate - was going to be R&D but changed after your reviews
    Thru hull exhaust

    At this stage I plan to stop at this (the words of many a seasoned modder I feel!).

    I am looking for hole shot, acceleration over absolute top speed.

    So I need help understanding AFR's please.

    I will set my AFR to 58psi and plan to use the rack standard Vtech 8350 tune (which I'm told favours 58psi).

    I feel from you guys in the know, I should at least keep an eye on my AFR's even if I don't log them.

    Therefore, my question. If I tap an O2 sensor into the manifold and hook up say a basic Innovate DB monitor, what will the pretty numbers tell me and what would I do with that information?

    Sounds stupid, but I need an AFR for Dummies overview.

    If it goes below X do this, if it is not more than Y do this and the perfect number is this, etc etc.

    To me, I get that you are measuring the mixture, but too lean or too rich what numbers are these and what should I do when I see them? panic? Pull the DESS off? Ignore?

    Take it easy on me, I'm trying to learn but from a 'real world' perspective.

    My plan was to upload the Vtech map and set FPR to 58psi and close the seat!

    Cheers


  2. #2
    boost junkie skidoochris's Avatar
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    you don't need to know the perfect numbers
    all you need to know what is the safe zone for the fuel your using
    87 fuel does not have the same safe zone as 93 octane
    afr numbers can and do change every day and even in the same day
    so perfect tune (afr) today may be in the unsafe zone tomorow

  3. #3
    Quote Originally Posted by skidoochris View Post
    you don't need to know the perfect numbers
    all you need to know what is the safe zone for the fuel your using
    87 fuel does not have the same safe zone as 93 octane
    Sounds like a good starting point - a "safe zone" or range.

    I'm living and riding in Stockholm, Sweden. I run 95 octane as we don't have anything else apart from 98 or E85 (nasty for ski's).

  4. #4
    stuckmoto's Avatar
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    General #'s - 14 to 13.5 @ idle
    13.5 - 13 up to 6000rpm/ boost
    12.5 - 12 6000 to WOT
    Some run 11.5 to 12 @WOT.
    Hope this helps

  5. #5
    boost junkie skidoochris's Avatar
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    95 ron Europe is only 91 here in the us
    if you have 98 (93 us octane) that is the fuel you should be using
    IMO 12 up is not safe zone with 95ron
    low 12s may never damage your motor, but the ecu may be pulling timing (lower power)
    about 12.2 afr is usually the peak power for gas
    Last edited by skidoochris; 10-20-2013 at 06:36 PM.

  6. #6
    Moderator Snoman's Avatar
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    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  8. #7
    Quote Originally Posted by Snoman View Post
    Pretty, we like pretty!

    So, what is this? Is this my perfect target scenario based on my set-up & fuel?

    Or is this a typical set of targets? Or is it your data log?

    Assuming that it's my new best friend then I could set in a Vtech logger, record my actuals, import into mapeditor and 'Autotune' to achieve these targets. Asuuming that this is always a moving target based on external air / water temps, correct?

    But the bottom line being, a set of data looking identical as the above is the utopia position? (again, assuming a rec rider looking for hole shot, punch, smooth firing etc).

    Am I close to understanding?

  9. #8
    boost junkie skidoochris's Avatar
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    IMO you shoot for those safe numbers with the fuel you have been using

  10. #9
    Moderator Snoman's Avatar
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    Quote Originally Posted by tornado34 View Post
    Quote Originally Posted by Snoman View Post
    Pretty, we like pretty!

    So, what is this? Is this my perfect target scenario based on my set-up & fuel?

    Or is this a typical set of targets? Or is it your data log?

    Assuming that it's my new best friend then I could set in a Vtech logger, record my actuals, import into mapeditor and 'Autotune' to achieve these targets. Asuuming that this is always a moving target based on external air / water temps, correct?

    But the bottom line being, a set of data looking identical as the above is the utopia position? (again, assuming a rec rider looking for hole shot, punch, smooth firing etc).

    Am I close to understanding?

    This is just a guideline table for your AFRs...those numbers in the table are close to what you want in a safe manner

  11. #10
    imp0ster's Avatar
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    I run 14 all the way to 3800 with 0 issues. If you want to be even safer make sure that Gen 3 of yours isn't leaking then give it its own water supply

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