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  1. #1
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    Need opinions on what size injectors

    I have a 05 Rxp. Stock bottom end, supertech valve springs retainers.. 137 +4 wheel. 4 inch kanaflex intake. I have a rrfpr with 42s. But the ecu I just bought is mapped for 8400 rpms and 50psi injectors. Do you guys think I can keep the 42s and just bump up the fuel pressure ?


  2. #2
    PWC Addict lilman573's Avatar
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    Do you have a way to monitor afr's? If not, you are playing with fire. Besides, how would you know what to up the pressure to?

  3. #3
    42s are to small for that charger and rpm . I was on the stock ecu and a 137 and out of injector

  4. #4
    I will not tune any blown Seadoo without at least 60s and I prefer VT1100s that are more like 90s on a standard 45 psi test.

    My 50 were maxed out stock on a cool day.

    Andy

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    AtoMIC_OraNGE greenbullet's Avatar
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    137 can be run on 50s but your fuel pressure is in the upper 70s I ran a Riva Ecu in 50 a duel reg setup and a 137 few years back. Ran fine. Only thing is the fuel preasure was in the upper 70s at wot. But that's my own findings. These skis have been out since 04 and they didn't have all the fancy tuning devices that there are now. I ran 2 years like that and now throw more boost to my ski and still 82+ on a stock 200+ hr bottom end

    IF anything upgrade your fuel pump to walbro 255 .
    You will need a way to monitor those Afrs with that Ecu and a fpr static and base your fuel pressure to the Afr once tested. What map or Ecu tune is it?

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    Yea I have a air fuel
    gauge with the O2 in j pipe so I can monitor it. So use are saying deff sell the 42s and go higher

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    AtoMIC_OraNGE greenbullet's Avatar
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    Quote Originally Posted by Seadoo1xp View Post
    Yea I have a air fuel
    gauge with the O2 in j pipe so I can monitor it. So use are saying deff sell the 42s and go higher
    yes. Go bosch 50 BUT you either need to go with a duel regulator setup like a fpr and a begI. That way you can fine tune your afr. But try it first and see

  8. #8
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    What's a duel setup ? I have a fuel pressure reg

  9. #9
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    Map or tune I think is called vtech... Basically mapped the ecu for 50psi injectors. 137 wheel. 4inxh intake

  10. #10
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by Seadoo1xp View Post
    the ecu I just bought is mapped for 8400 rpms and 50psi injectors. Do you guys think I can keep the 42s and just bump up the fuel pressure ?
    No, you will need to run the injectors the ECU was mapped for
    http://www.4-tecperformance.com/inde...oducts_id=1155

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