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  1. #1
    2000 GPRXP 4tec shooter98xpl's Avatar
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    AFR reading Lean condition?

    I have a 2005 rxt motor with a X charger, 42 lb injectors, External Intercooler, Riva fuel pressure regulator (set at 60), warlboro fuel pump. Using an AEM gauge to read the air fuel ratio. Using a 45 degree attachment at the exhaust. According to the website, the 45 degree attachment is not suppose to hurt the reading. I don't have the O2 sensor directly in the manifold. I have the hose attached from the regulator to the side of the air intake via a block off and nipple.
    The readings I get are 11 at idle, 12 around midrange and then it gets to 13 and steadily climbs to 13.9 at wot. I have turned up the regulator, turned down, doesn't make a difference. The ski just started to surge on top end the last time out. The week prior I did have the exhaust hose (water) pop off and by the time I realized it, it was already heated up. But ski was still doing the same thing before this. boost readings are pretty dead on for the x charger, 10 lbs of boost at 8100 rpms. Any suggestions on the readings?
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  2. #2
    Moderator beerdart's Avatar
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    Are you on the limiter that would throw off your WOT AFR's

  3. #3
    Eric Ocman's Avatar
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    Using boost ref line?

  4. #4
    2000 GPRXP 4tec shooter98xpl's Avatar
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    BD it would do it at 8000 as well. Around 8000 rpms it was at 13 on the gauge. You remember that innovative adapter you had posted up, well I am using that. I am wondering since the 02 sensor is not all the way in if my readings would have been off, but according to the site, it won't affect it as it will still pick up the fuel in the exhaust.
    Ocman if your talking about the line that comes out the regulator and goes to the air intake, the small line, then yes I am running that as well.
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  5. #5
    Eric Ocman's Avatar
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    Can you see if your fuel pressure Is rising with boost?

  6. #6
    2000 GPRXP 4tec shooter98xpl's Avatar
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    Yes it does, I looked at that as well. It goes up to around 65 66.
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  7. #7
    Eric Ocman's Avatar
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    Quote Originally Posted by shooter98xpl View Post
    Yes it does, I looked at that as well. It goes up to around 65 66.
    SHOOTER
    If your fuel pressure is rising and your afr is not changing then imo you may have an injector issue. Do you have another set to try?

  8. #8
    2000 GPRXP 4tec shooter98xpl's Avatar
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    Just sent the injectors out cause I thought it was a possibilty as well. I got them cleaned and they are on their way back to me. Heres another question that you might be able to answer for me. If I don't want to run a fuel pressure regulator, is there another set of injectors I can run on this ski besides the 42's?
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  9. #9
    Eric Ocman's Avatar
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    Quote Originally Posted by shooter98xpl View Post
    Just sent the injectors out cause I thought it was a possibilty as well. I got them cleaned and they are on their way back to me. Heres another question that you might be able to answer for me. If I don't want to run a fuel pressure regulator, is there another set of injectors I can run on this ski besides the 42's?
    SHOOTER
    Yep, Bosch 48s but you need to keep your adjustable regulator bro. You will need the flexibility when u upgrade further. This is a gprxp right?

  10. #10
    2000 GPRXP 4tec shooter98xpl's Avatar
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    Yes its a gprxp. I wondered about going to the 48's as I know seadoo likes to run their skis on the edge. I wondered if they did the same with the 4 tecs. The motor is completely stock. I was just trying to make it a 255 hp ski so I set it up like it was a rxpx.

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