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  1. #1
    gp1800r's Avatar
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    Question 2012 RXPX RPM problem

    Hi this is my first post on greenhulk but I need some help with my MODED RXP-X 260. I have a V-tech tune on it right now to rev 9000 rpm and I'm only getting to 8500 rpm am running a 15/20r solas prop with an ET 65-140 & 60lb injectors. I was wondering what do you guys think if I switch out the nozzle for an 85mm or 87mm? I know of a few ppl running with 14/19 and 15/19 props but I'm a big fan of the 15/20's. Some ppl have told me that the 15/20 is to big and the new RXPX can't push them bcz of the new hull design. I don't want to believe that. I just want to get more RPM's. Would like to get some feed back from every1 to see which set up would work best. I ride my ski in salt water and I'm looking to get the most outta the SC


  2. #2
    Water4fire's Avatar
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    My SKi with a 15-19 turns 9100rpm's and thats with a 2Rude. WIth as 15-22 it tuns 8500, so I believe you need to pay attention to some fine details as it seams you are low somewhere. Check your slip on your SCer. Check for boost leaks, What does your air intake look like and what thermostat?
    Oh yea, did you pitch block your prop? NO prop I have ever bought was correct!

  3. #3
    Aussiepauly's Avatar
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    Exactly as water4fire said, you have something wrong, with your mods, that 15/20 should be at 9000+!

  4. #4
    CHAD IBADTON's Avatar
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  5. #5
    C Doo's Avatar
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    u need to do more than just charger & injectors to spin that prop more than 8600... IMO

  6. #6
    Water4fire's Avatar
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    Quote Originally Posted by C Doo View Post
    u need to do more than just charger & injectors to spin that prop more than 8600... IMO
    Do you have a big SCer? A 68-140 and I am sure he did a air intake. Mine fricking smokes a 15-20 with a 2rude. SO you are in correct. Try his set up out and you will see. Hell I turned my 15-22r 8500 with my 2rude and thats a big prop.

  7. #7
    C Doo's Avatar
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    Quote Originally Posted by Water4fire View Post
    Quote Originally Posted by C Doo View Post
    u need to do more than just charger & injectors to spin that prop more than 8600... IMO
    Do you have a big SCer? A 68-140 and I am sure he did a air intake. Mine fricking smokes a 15-20 with a 2rude. SO you are in correct. Try his set up out and you will see. Hell I turned my 15-22r 8500 with my 2rude and thats a big prop.
    i am running a ET 137 + 4mm, at 8650, on a 15/20R and it get there in the blink of an eye... but i have done a fair bit of work around it. charger alone is best bang for buck, but u need a few more bits to compliment it to get it running right.

    but thats just my 2c... plus I am on the other side of the globe to u guys. we seem to get lower rpm and top speed with same mods as u USA guys

  8. #8
    C Doo's Avatar
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    first thing get your afr dialed in...

  9. #9
    Water4fire's Avatar
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    A ET +4mm is in no way a 68-140 bro. Sorry Im not at all tring to beat you down, but your +4 is great it is just not a 68-140. Period, so like mentioned do you have a big SCer? You do not need much. I have a air intake, 2rude, Riva valvetrain, Fizzle HE IC, Athena ECU and a prop. I turn 8500 with a 22 and he has a bit of a bigger SCer. I smoke a 15-20. Its a joke. PERIOD! too small a prop unless I like 9100rmps all the time.

  10. #10
    C Doo's Avatar
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    but if he is running too rich he will not be seeing full power...

    plus we all know how great the stock ICs and pipework are...

    Also his 15/20 might not really be a 20... some are way out from solas

    Not trying to get into a pissing match here mate. I do have a 3 rude sitting on my shelf but have been getting the ET dialled in first... I will be testing the 3 rude very soon. rather looking forward to it! So yes, i do have a big SC, its just not yet spinning

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