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  1. #1
    Ski Hacks MG's Avatar
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    Question . . . 13.6:1 AFR at WOT

    Dropped the ski in today for a sanity check and it was pretty chilly. Air temps 52-55 and water temps, mid-upper 40's, maybe low 50's. Rode around for a few minutes to warm up and decided to make a few short WOT passes after about 15 minutes (under 5-6 seconds each). At WOT, I was seeing 13.6:1 on the AEM Wideband. Seems a little on the lean side for my liking but what kind of affect does cold water and air temps have on the AFR's in these skis? I believe I was seeing 12:2 - 12.5 in the fall.

    PS, running a C3-11 at approx. 14-15psi.


  2. #2
    Slamdcoop0428's Avatar
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    Little on the lean side?? That's leaner then my NA vette. I don't care what it is boosted setups should be 11.4-11.8 for the chance of filling up with sub par fuel.

  3. #3
    lets race.... mikeFZR's Avatar
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    That is super lean. AFR at WOT should be 11.8-12.2 to be safe IMO. Surely there are some pro tuners who can safely push the limits, but it's not worth wrecking your engine.

  4. #4
    Most boosted skis that I tune get set up 13 AFR at 0 boost, fading to 11.8 at 15 psi and if they are big boost, about 11.5

    The racers are willing to go to about 12.6 at 15 lbs but I tend to get nervous at that point. I much prefer knock detection at this boost level. If there is any pattern of the ECU pulling timing timing, I always test better fuel and then give the owner the choice of how to deal with it.

    I never get involved unless the ski has full time data logging.

    Hope this helps

    Andy

  5. #5
    Mod less, ride more! troyheb's Avatar
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    What was your rpm @ wot?

  6. #6
    Ski Hacks MG's Avatar
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    8650ish

  7. #7
    Mod less, ride more! troyheb's Avatar
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    Quote Originally Posted by CCW View Post
    8650ish
    The higher you rev, the richer you need to be.

  8. #8
    Chupacobra's Avatar
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    Could be your o2 taking a shit. Try recalibrating the gauge


  9. #9
    hdlefler's Avatar
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    You get leaner during the winter time and you would need to adjust your afr's. I bet your rpms went up 200 rpm. 13.6 is not good. Be careful.

  10. #10
    Ski Hacks MG's Avatar
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    I knew it would lean out some.

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