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  1. #1
    07BRPRXP's Avatar
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    What mph should I be hitting?

    Current mods:
    07 Rxp 215
    fizzle 4" intake
    X charger
    42lb injectors (green)
    R&d intake grate
    Greddy Bov

    Mods coming:
    fizzle ext. intercooler
    Shorten j pipe 1 3/4"
    tdr water box/riva thru hull pipe
    pro series opas block offs
    Reverse bucket trim

    THANKS ANY INFO IS GREATLY APPRECIATED...


  2. #2
    07BRPRXP's Avatar
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    Also should I change prop or wait till I put et137 charger later...

  3. #3
    pete71's Avatar
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    Add bigger injectors with ext. intercooler

  4. #4
    07BRPRXP's Avatar
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    How come? Doesn't the stock X come with these 42's with factory ext. cooler?

  5. #5
    pete71's Avatar
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    Nope 48's

  6. #6
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    Quote Originally Posted by 07BRPRXP View Post
    How come? Doesn't the stock X come with these 42's with factory ext. cooler?
    Yes 42 lbs for x charger with a flashed ecu or rrfpr and stock ecu. 48's will be rich on bottom end and very possibly lean on top without a rrfpr or fuel controller

  7. #7
    Having Fun jp1300r's Avatar
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    Quote Originally Posted by 07BRPRXP View Post
    How come? Doesn't the stock X come with these 42's with factory ext. cooler?
    The X ECU is mapped a little different than a RXP ECU. Many guys on here just running 42's and RRFPR ok with X SCer, EXT. I/C and stock RXP ECU. Get a MTX-L to monitor AFRs though to know if you are tuned ok.

    With what you have should be 70-74mph depending on your overall set up. I would say 73-74mph if everything is good.

  8. #8
    07BRPRXP's Avatar
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    Quote Originally Posted by jp1300r View Post
    Quote Originally Posted by 07BRPRXP View Post
    How come? Doesn't the stock X come with these 42's with factory ext. cooler?
    The X ECU is mapped a little different than a RXP ECU. Many guys on here just running 42's and RRFPR ok with X SCer, EXT. I/C and stock RXP ECU. Get a MTX-L to monitor AFRs though to know if you are tuned ok.

    With what you have should be 70-74mph depending on your overall set up. I would say 73-74mph if everything is good.
    Awesome, sounds great! Still getting all parts together from sunken ski.. Why do some people say 48's or even 50's though??? Thanks!

  9. #9
    RXPJAY's Avatar
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    With the 137 you will need the 48's. You should be fine with 42's on the x. I run 42's with the et127 with no issue. AFR's are good. When all your mods are done, you have the the exact mods minus the different wheel and the best i've seen was 77.4 @ 8160rpm. As stated, buy the insurrance package, an AFR gauge!!!

  10. #10
    07BRPRXP's Avatar
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    Quote Originally Posted by RXPJAY View Post
    With the 137 you will need the 48's. You should be fine with 42's on the x. I run 42's with the et127 with no issue. AFR's are good. When all your mods are done, you have the the exact mods minus the different wheel and the best i've seen was 77.4 @ 8160rpm. As stated, buy the insurrance package, an AFR gauge!!!

    Thanks for all the help guys! I'm hoping to hit 80mph but I guess 77-78 will do for now! lol

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