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  1. #1
    !!!! wave jumper !!!! 05_RXP's Avatar
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    x charger and 42's

    he guys i got a couple questions. my charger is getting to the point that it should have a rebuild. so the cheapest and easiest route for me to go is the x and 42's. my question for you guys that are running the x, 42s, and riva stage one kit. what should i see for speed? i have gotten some pretty good predictions but i want to see if anyone has a actual gps speed rating. my next question for that is should i just pitch the 14/19 or should i go to the 15/20 with that set up?


  2. #2
    SJL Custom's Avatar
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    If your not planning on running an external intercooler, then you wouldnt need the 42s. I would pitch the prop you have now and only get a 15/20 if you get an external intercooler.

  3. #3
    Water4fire's Avatar
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    It really all depends on set up. I have got just X SCer and 42's to run 77 on a RXP.... How.
    Well Open loop and Riva ride plate, and a Riva rear air. SKi ran down right awesome.

  4. #4
    Quote Originally Posted by SJL Custom View Post
    If your not planning on running an external intercooler, then you wouldnt need the 42s.
    Are you sure about that?.....I was under the impression that an S3 was the largest wheel you can run w/o more fuel on a stock IC.

  5. #5
    Site Admin Green Hulk's Avatar
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    To run an X charger with the stock intercooler I recommend 42 lb injectors to keep your air/fuel ratio safe
    If at any point you choose to run an after market external intercooler then you will also need a rising rate fuel pressure regulator and the 42's

    With either scenario you will want to use a 15/20R impeller.

  6. #6
    SJL Custom's Avatar
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    i know of an 04 rxt running an x charger, xs cooler and lc1 and his AFRs are more than safe across the entire rpm band. Thats with the stock 38s and no rising rate.

  7. #7
    mrbtd's Avatar
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    Quote Originally Posted by SJL Custom View Post
    i know of an 04 rxt running an x charger, xs cooler and lc1 and his AFRs are more than safe across the entire rpm band. Thats with the stock 38s and no rising rate.
    Only on stock intake

  8. #8
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    I ran that setup with great results but went with a riva 15/19 which I have for sale now cause I'm going to a rude charger

  9. #9
    !!!! wave jumper !!!! 05_RXP's Avatar
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    well i am going with the charger and injectors to be safe and see the gains then over the winter i plan on doing the i/c. my next question is how do the x's run the external intercooler and x charger with no rrfpr. in theory could i have my ecu re mapped to the same as an x or use an x ecu?

  10. #10
    AtoMIC_OraNGE greenbullet's Avatar
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    your ecu is fine if you go rrfpr.... you can use stock ecu .. if you want rotax or riva you need valve train upgrade......

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