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  1. #1
    WBoulton's Avatar
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    what else should I add? My 07 RXP winter project.....

    I bought an 07 RXP at the end of last season for a smoken deal. Rode it twice and decided it was to slow. So far I've picked up and X charger with an ET137 wheel and spacer and a riva grate. things I'll be picking up/doing in the next few weeks are xs intercooler, oiler mod, home made thru hull exhaust, wide band 02, 4in intake, nozzles, prop, fuel pressure regulator, and what ever injectors I'm gonna need. so basicly, what injectors do you guys think I'm gonna need? seems like its a toss up between 42s and 48s, leaning towards 42s. what prop do I need? Also is their anything else I need to add to this list? This is a rec ski I use on the river and down the shore in the summer. I don't wanna be messing with it all the time and I'm looking for 78-80mph out of it with a killer hole shot.


  2. #2

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    Imo you should go with a 15/20R prop...as far as injector the 48s sound really good to me if not use 50s...

  3. #3
    oklagp1200r's Avatar
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    I think you will need 50's or bigger on the injectors and a 15/20R impeller!

  4. #4
    b_dolla44's Avatar
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    my honest opion is if your looking for a relible 80 mph ski minic the riva stg 3 kit... cheepest way is to look for used parts... the money you spent on the RRFPR, ET charger, wide band, a/f guage, ect.. you could buy a used x charger 400ish, complete fizzle ic kit 400, used riva ecu $500-$700, new riva valvetrain $500ish,used 15/20r $175ish bla bla bla...this way you won't have to worry about A/F's and RRFPR's....just my 2cents....

  5. #5
    WBoulton's Avatar
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    the ET137 is an X charger, just has a spacer and different wheel. I probably have a LC1 and gauge laying around also. no interested in the ecu right now. I figure if I want more next year I'll do a ecu and ride plate.

  6. #6
    Sayers's Avatar
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    If your not going with the ECU you will most likely need to prop it, otherwise your going to be on the limiter with the mods your suggesting. In any case as stated you best to upgrade the prop for best performance.

    IMO its always good to have AFR monitoring so you know exaxtly whats going on. If you are upgrading the fuel system you might consider a Walbro GSS 342 and one of Danny's billet fuel rails (for piece of mind). With the fuel rail and boost referance hooked onto the RRFPR you may be fine with the 42"s.

  7. #7
    R88ory RXP's Avatar
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    Quote Originally Posted by Sayers View Post
    If your not going with the ECU you will most likely need to prop it, otherwise your going to be on the limiter with the mods your suggesting. In any case as stated you best to upgrade the prop for best performance.

    IMO its always good to have AFR monitoring so you know exaxtly whats going on. If you are upgrading the fuel system you might consider a Walbro GSS 342 and one of Danny's billet fuel rails (for piece of mind). With the fuel rail and boost referance hooked onto the RRFPR you may be fine with the 42"s.
    I dont think 42s are enough for this charger, I was running a stock X charger and was running 70psi on 42s to get 11.5-11.7.

    I think the 48s will be the ticket then adjust the RRFPR so the top end is correct.

    R88

  8. #8
    Eric Ocman's Avatar
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    Yep, Go ahead and Get Bosch 48's bro. They will also work fine with a Riva ECU when you decide to make the jump up.

  9. #9
    masta2000's Avatar
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    15/22 in my opinion, it's what i used on my rude1 with stock ecu

  10. #10
    Sayers's Avatar
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    Quote Originally Posted by R88ory RXP View Post
    I dont think 42s are enough for this charger, I was running a stock X charger and was running 70psi on 42s to get 11.5-11.7.

    I think the 48s will be the ticket then adjust the RRFPR so the top end is correct.

    R88
    True that. The safer money would be to go staraight for the 48's. As others said they will also work with an ECU upgrade if you go that direction.

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