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  1. #1
    Swedish Viking Craigo's Avatar
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    Running Rich @ 7000RPM and UP

    Can somebody get me some advice on how to get my AFR UP! Ever since I installed my Walbro fuel pump - I can't get the AFRs below 10.9 @ 7000rpm and above... I know this sounds silly - "well, turn the fuel pressure down"! - right?

    I'm currently running a stock ECU with the Walbro fuel pump, 42lb Bosch injectors and a Riva RRFPR (without the boost reference line attached). Everything runs good and the AFRs stay safe if I'm at 58lbs of fuel pressure - UNTIL - I hit the 7000 RPM range. My ski is running great, then I see the AFR drop to 10.9 @ around 7000 RPM, then, the ski gets "stuck"... It wasn't like that when I ran my stock fuel pump!!!

    I'm thinking of installing the stock 38lb injectors and dropping the fuel pressure or re-installing my stock fuel pump - but I'm afraid of leaning it out in the mid-range. I've also been running the RUDE fuel controller - which doesn't seem to help... WTF?

    It goes from 13.3AFR @ 6000rpm to 10.9AFR @ 7000RPM and I can't get past 7100rpms - presumably, because it's running too much fuel up top...? If I keep pushing the throttle down after 7000rpm the AFRs get even richer - say 10.6 ...

    Any help would be helpful.

    Thanks,

    Craigo


  2. #2
    Mothman's Avatar
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    Try hooking the reference line up and dropping base pressure. Ya never know.
    Good luck!

  3. #3
    shrabber's Avatar
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    What boost you running?

  4. #4
    Bob 1tommygunner1927's Avatar
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    Put the stock fuel pump back in.......maybe the walbro is defective.

  5. #5
    boost junkie skidoochris's Avatar
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    my 05 ecu went into over boost/rev limiter at only about 10psi about 7000+ rpms and went pig rich

  6. #6
    AtoMIC_OraNGE greenbullet's Avatar
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    begi......is needed

  7. #7
    alex29573's Avatar
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    Iat sensor?

  8. #8
    mikelytle1077's Avatar
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    Don't you have the rude controller ? Anything around 10 afr tends to sputter and not build revs

  9. #9
    iron head's Avatar
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    air temp or map sensor

  10. #10
    monaroman76's Avatar
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    Something else is up here Craigo, 10.9:1 afr will definitely effect power output, but not to the extent where you will not be able to go past 7100 rpms. I used to turn my ski to 8000 rpms no problem @ 10.8:1 WOT before installing a RRFPR. I don't believe it has anything to do with the fuel pump, or else it would go lean, not rich.

    I'd be looking into the s/c, where is the slip set at?

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