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  1. #1
    skigolfnut's Avatar
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    Fuel injector question

    I was wondering with my current set up what max rpms could I get, without getting lean?

    I was able to run 8600 rpms this summer with no problems, but I wanted to bump my rev-limiter to get a little more for closed course racing,
    Right now with the current rules I have to use any stock injector that seadoo puts on an X ski,


    My current set up is the folloiwng:
    06 RXP- ET-137 charger-rrfpr-innovate AFR gauge-bosh real green 42's --EX-IC- new Walbro fuel pump--rotax racing exu for 8650, 08-water box and mid pipe set up, supertech valve train upgrade


  2. #2
    mac_man_luke's Avatar
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    they put 48s in the iControl skis but dont think they are backwards compatible?

    Cant just bump the fuel pressure a bit more?

  3. #3
    jbombino's Avatar
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    Fuel injector question

    Quote Originally Posted by mac_man_luke View Post
    they put 48s in the iControl skis but dont think they are backwards compatible?

    Cant just bump the fuel pressure a bit more?
    The are not compatible, e connectors are different

  4. #4
    boost junkie skidoochris's Avatar
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    Connector adaptors are available
    but you can buy Bosch 48 with ev1 plugs
    Never heard of e, do you mean uscar/ev6?

  5. #5
    rangermtb5's Avatar
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    Fuel injector question

    Prob meant to say electrical connectors are different.

  6. #6
    skigolfnut's Avatar
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    seadoo02xp sent me this today,

    With an ET-137 and 48# injectors you should be just fine, you may need to adjust fuel pressure a tad but as long as the rising rate reference line is connected you shouldn't have any issues at that rpm, stock 48 injectors will fuel a Riva xxx o around 8800 rpm with no issues, it does fall off a little past that but that is a larger charger than you have and that was approaching 16 psi boost. as long as your valve-train is set up for it I wouldn't be afraid to set the limiter at 8800-9000 with that setup,
    And with 42's you should be good, as long you watch afr's you will be OK, you should have enough room to compensate with a RRFPR.

  7. #7
    West Texas RXP skoepp's Avatar
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    48,s would be best if you could run them.

  8. #8
    R88ory RXP's Avatar
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    Quote Originally Posted by skigolfnut View Post
    I was wondering with my current set up what max rpms could I get, without getting lean?

    I was able to run 8600 rpms this summer with no problems, but I wanted to bump my rev-limiter to get a little more for closed course racing,
    Right now with the current rules I have to use any stock injector that seadoo puts on an X ski,


    My current set up is the folloiwng:
    06 RXP- ET-137 charger-rrfpr-innovate AFR gauge-bosh real green 42's --EX-IC- new Walbro fuel pump--rotax racing exu for 8650, 08-water box and mid pipe set up, supertech valve train upgrade
    Think its one of those things you are just going to have to test, I think you could run the begi dual regulator setup within the rules which would allow you to fully adjust the fuel pressure over the whole rev range and get it right, but you are going to need to be quite high at WOT probably over 75psi, maybe you will need a different fuel pump too.

    I have heard of 8800 being run in stock class on the 42s but thats with less boost then you, also on stock fuel pressure tho.

    Good luck.

  9. #9
    R88ory RXP's Avatar
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    Looks like you can go to 48s in ltd...

  10. #10
    From what I have seen on data logs coming off a totally stock 2012 bike, these motors a flat out of injector duty cycle. A rising rate FPR may get you a little more dynamic range but I have not tested it.

    This would require at least a CMD to retune the bike if you go this direction.

    see http://www.ncs-stl.com/pc5wb/2012Sea...ingGraphed.png

    Andy

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