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  1. #1
    koftis's Avatar
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    Which Impeller is suitable for modified RXP-X?????

    Hi all,

    I just wanted to ask for your advice. I have an RXP-X with the following stuff:
    1)Rotax Racing Impeler with spacer
    2)Rotax Racing thermostat
    3)Rotax Racing Pump with 83 mm ring
    4)4 inch fizzle kit
    5)Work grate
    6)Solas 15/22 impeler
    7)Riva block offs
    Riva sponsors
    9)Stock Injectors with Stock ECU

    I use it on the sea and i have seen 73.5 GPS. The next step i am going to do is put:

    1)Rotax Retainers
    2)Rotax racing head gasket
    3)Modify the throttle body (acctually Malte is doing that for me )
    4)Choose between the Rotax racing ECU with 8800 rev limiter or the new Motec ECU with 8600 limiter.
    5)Rad 4 Racing Torque Plate.

    In order to reach this RPM i need to change the impeller and i was thinking of putting either the Solas SRX 14/19 or the Solas 15/20. I talked with Malte and he thinks together with me that the 15/20 is most suitable. Can anybody advise me which is best from the two?


  2. #2
    West Texas RXP skoepp's Avatar
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    I would go with the 15/20 or even better yet, test your new setup with your 15/22 and see what your rpms are at, then depitch the 15/22 to put your rpms spot on.

    It is not nescessary to buy a new 15/20 if you have someone that can repitch your 15/22.

  3. #3
    koftis's Avatar
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    Malte is going to repitch that for me cause he knows best. But we can not repitch it too much because the hydrodynamics of it its going to be destroyed.

    In order to reach these RPM with the specific pump we need to change to a different impeler. Thats why i was thinking of 15/20 but i was not quite sure.

  4. #4

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    Re: Which Impeller is suitable for modified RXP-X?????

    15/22 should be the same as a 15/20 ... Just has more pitch is all...

    Solas doesn't make a 15/22.....


    Sent from my iPhone using Tapatalk

  5. #5
    sp_RXP_GR's Avatar
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    kostas my friend, i would go with the 15/20 with the 16 veins pump.
    Tell malte to send you also the special pump cone!!!!!
    if you need 8800 ecu i have one.i also have 8650...
    just give me a call

  6. #6
    koftis's Avatar
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    Quote Originally Posted by pdxrealtor View Post
    15/22 should be the same as a 15/20 ... Just has more pitch is all...

    Solas doesn't make a 15/22.....


    Sent from my iPhone using Tapatalk
    Solas does make 15/22 impeler. I have it and i got it form Jerry.Its very good. Here is the link: http://www.4-tecperformance.com/inde...roducts_id=734

  7. #7
    koftis's Avatar
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    Quote Originally Posted by sp_RXP_GR View Post
    kostas my friend, i would go with the 15/20 with the 16 veins pump.
    Tell malte to send you also the special pump cone!!!!!
    if you need 8800 ecu i have one.i also have 8650...
    just give me a call
    Sotiri, i remeber that you told me that you have both ECU. For the impeler i dont know which one i will choose. I will have to test both to see which one is better when i will put the ECU on. Regarding now the ECU i am thinking of putting the MOTEC cause it has many features and the most important is that i can reprograme it and used it to any other pwc!!!

    Also, if i decide to put the Rotax Racing ECU 8800 i will have to use as you know the lightweigh valves together with the reatainers. It is a must if you go higher than 8700 RPM. Malte told me that together with my mechanic and someone who owned a black RXP...... Thats why i was thinking of getting the Motec.

    For the Rotax Racing pump that i have Malte has send me the cone as well. I dont know if there is any different one.

  8. #8

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    Quote Originally Posted by koftis View Post
    Solas does make 15/22 impeler. I have it and i got it form Jerry.Its very good. Here is the link: http://www.4-tecperformance.com/inde...roducts_id=734
    From what I understand, the current 15/22 is just a repitched 15/20-- the casting and root angles are the same-- meaning the 15/22 can be pitched to a 15/20 by the right person w/ the right tools.

  9. #9

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    Quote Originally Posted by jim View Post
    From what I understand, the current 15/22 is just a repitched 15/20-- the casting and root angles are the same-- meaning the 15/22 can be pitched to a 15/20 by the right person w/ the right tools.
    Correct... that impeller is sold in Jerry's store from RIVA, RIVA buys them from solas and tweaks them.

    They do the same thing with SKAT impellers... they add the "R" after the pitch number because they are ---super accurate--

    Jerry or someone else will correct me if I'm wrong...

  10. #10
    If the R means accurate, then my 15/21 is not accurate because when I went from the 21 to the 22R, my rpm's went up. I thought I would pick up a little top end and lower the revs with the 22. Turns out the 22 is a good warm weather prop and I think I'll get the 21 re-pitched to use for a cool prop. These P-X's sure are great machines.

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