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  1. #1

    AFR's rich at idle, lean at WOT. Help!

    Hey guys, I've been doing a lot of research on tunes and I think I've sold myself on a V-tech. Before I pull the trigger I want to make sure I'm barking up the right tree.. Unfortunately, as you'll see below I bought a ski with many unknowns and am trying to sort things out.

    Here's what's happening: At idle my AFR is about 10 or less and at WOT it jumps to about 15.. It has a RRFPR and the only way I can get the AFR at idle to be 12 or more is if I crank the pressure down to 20psi or so, then obviously it's much leaner at WOT...
    The ski has a reflashed ECU (bought it this way) and I'm thinkng that this is the cause of the issue. I don't know who reflashed it or what the maps looks like. Seller never came through with build sheets of any sort..

    Here's what it is:

    06 RXT
    50 lb injectors (flow 43-57 when tested)
    RRFPR
    X charger? See this link, i was told it was a mini ride when I bought the ski. http://www.greenhulk.net/forums/showthread.php?t=218447
    XS power intercooler
    15/20 impeller
    83mm pump nozzle
    Through hull exhaust

    Do you feel this is an ECU issue? If so is my best option V-tech or do I get a reflash from Riva?


  2. #2
    Try hooking up the RRFPR to the intake manifold. That will change things.

  3. #3
    Quote Originally Posted by whittlebeast View Post
    Try hooking up the RRFPR to the intake manifold. That will change things.
    RRFPR is hooked up to the intake manifold and working properly.

  4. #4
    Quote Originally Posted by d rabbit View Post
    Quote Originally Posted by whittlebeast View Post
    Try hooking up the RRFPR to the intake manifold. That will change things.
    RRFPR is hooked up to the intake manifold and working properly.
    Sounds like something is serious amiss.

    I never tune anything anymore without serious data logging.

    Andy

  5. #5
    ncdoo's Avatar
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    The RRFPR should raise the fuel pressure 1 psi for every pound of boost, which will richen the air/fuel mixture and drop your AFRs.

  6. #6
    ncdoo's Avatar
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    How do you know the RRFPR is working properly?

  7. #7
    I monitored it while riding, seems to rise about 10 Psi at 10 lbs of boost.

  8. #8
    AtoMIC_OraNGE greenbullet's Avatar
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    Run it static. 60 lbs at idle and start there. on the regulator. Use a one way check valve on the regulator. This will lean out your idle and up to about 5000. Once into the boost the regulator will act like a normal fpr and not rise This is what I've just done with my custom 9200 80lb Ecu and it fixed my issues and runs great ! Just my 2 cents but worth a try. This way the check valve will pull fuel in the idles like a rrfpr will do but without a ref line hooked up. Once Into boost it will give you the fuel you need based on your fueling needs

  9. #9
    boost junkie skidoochris's Avatar
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    buy a cmd and then you can get them all right

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  11. #10
    Quote Originally Posted by greenbullet View Post
    Run it static. 60 lbs at idle and start there. on the regulator. Use a one way check valve on the regulator. This will lean out your idle and up to about 5000. Once into the boost the regulator will act like a normal fpr and not rise This is what I've just done with my custom 9200 80lb Ecu and it fixed my issues and runs great ! Just my 2 cents but worth a try. This way the check valve will pull fuel in the idles like a rrfpr will do but without a ref line hooked up. Once Into boost it will give you the fuel you need based on your fueling needs
    You're saying to put a check valve in the reference line so that it only reads vaccum and not boost? This makes good sense but the vaccum isn't going pull the pressure down enough to make it idle at 11-12.. The only way I've seen any acceptable AFR at idle is at about 20psi...

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