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  1. #1
    stuckmoto's Avatar
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    AFR while motor is under load around 5K

    As title states - wondering what the target AFR should be around 5-6K while the motor is under load(towing). I was pulling a tube Sunday and wondering if my normal AFR (not on boost) is enough.
    Does it matter if you're just cruising or pulling a heavy load(Yes I was breaking the rules and towing three teenagers)?


  2. #2
    About 13 AFR at 5000 and no boost. Fading to 12.2 AFR at WOT and full boost.

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  4. #3
    Here is the fuel map off one of my tunes.

    http://www.ncs-stl.com/pc5wb/StockRxpxFuelAfrMap4.PNG

    Andy

  5. #4
    AtoMIC_OraNGE greenbullet's Avatar
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    I run 13.5 - 13.7 at 5-6500

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    AtoMIC_OraNGE greenbullet's Avatar
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    Quote Originally Posted by greenbullet View Post
    I run 13.5 - 13.7 at 5-6500
    im also running a begi too so at 6 k it will go rich and start to pull fuel

  7. #6
    GRF + DashPac:) seadoo02xp's Avatar
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    Quote Originally Posted by greenbullet View Post
    I run 13.5 - 13.7 at 5-6500
    Me too

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  9. #7
    warsawspeedfreak's Avatar
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    If you have v-tech...curiosity killed the cat I know, but where are you at right now across the board? Are you asking because you are worried? Better to find out if your fuel pressure is set okay or needs an adjustment up or down.

  10. #8
    At those sorts of revs, you will start getting into boost fairly easily. 13.7 AFR is rather lean for my taste. Keep in mind that detonation will kill a motor real quick. These motors have timing retard but.....

    Andy

  11. #9
    stuckmoto's Avatar
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    Quote Originally Posted by warsawspeedfreak View Post
    If you have v-tech...curiosity killed the cat I know, but where are you at right now across the board? Are you asking because you are worried? Better to find out if your fuel pressure is set okay or needs an adjustment up or down.
    I am somewhere between 12.8 - 13.5( It varies with RPM and which tune/psi I'm running). Just wondered if on the high side like 13.5 was enough when you're towing with a constant load. Or doesn't it matter load/no load?

  12. #10
    The oil squirters under the pistons and the detonation retard may be saving your butt on this one.

    Andy

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