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  1. #1
    Jkmike's Avatar
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    Impeller Advice Needed RXT-X 260 w/ 300 XXX 142 Charger Conversion

    Hey Yaw,

    I could use a bit of impeller/prop pitch advice. I am running a RXT-X 260 with a 300 XXX 142 Charger conversion and a fully built motor (See my sig for details). I am currently running a Solas SRZ-CD 15/20R impeller in a Solas 159 Pump with a Lucky 13 Cone (Only using Red Spacer). Currently I am only seeing a max loaded RPM of 8700 but i want to be closer to a max of 9300-9500 RPM.

    What would yaw recommend I go for as far as impeller & pitch? I would prefer to either purchase a new impeller entirely or send mine out to have it professionally rep itched and balanced.


  2. #2
    DR2006RXP's Avatar
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    What afr is it running and any way to log it , maybe itís not doing full boost ?

  3. #3
    Bob 1tommygunner1927's Avatar
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    Try some 1/2" spacers to raise the grab handle/seat and do not use the storage bucket. The S3 hull needs more air!

  4. #4
    ptscon's Avatar
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    Something is not right about those RPMs, should be higher. Remove the lucky13 cone.


  5. #5
    ncdoo's Avatar
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    Quote Originally Posted by ptscon View Post
    Something is not right about those RPMs, should be higher. Remove the lucky13 cone.
    Sometimes the L13 just doesn't live up to its name.

  6. #6
    Jkmike's Avatar
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    Quote Originally Posted by DR2006RXP View Post
    What afr is it running and any way to log it , maybe it’s not doing full boost ?

    I have a Maptuner X with data logging, and i did extensive logging and tuning last season. As for my afr i am around 11.8 to 12.0 at 8700 rpms and 18.8 psi of boost. Riva claims the 142 should be making 18.5 psi at 8500 rpm so I'm pretty close.

    This is one of my final logs from last season.
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  7. #7
    Jkmike's Avatar
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    Quote Originally Posted by 1tommygunner1927 View Post
    Try some 1/2" spacers to raise the grab handle/seat and do not use the storage bucket. The S3 hull needs more air!
    That's definitely worth a shot with the seat spacers. But short of just removing the storage bucket for testing on purely flat water, i wouldn't want to ride without it. I almost always have to go through chop at some point where i ride and that would make it way to easy for water to get in.

    However, i do have 4 2" Flow Rite vents installed in the ski. 2 under the rear grab handle and 2 up where the cover for the back of the gauge cluster is.

  8. #8
    Jkmike's Avatar
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    Quote Originally Posted by ptscon View Post
    Something is not right about those RPMs, should be higher. Remove the lucky13 cone.
    I agree about the RPMs. These are about the same RPMs i was seeing when i had the 68-140 charger installed, although i will say that the performance throughout the rest of the RPM range was greatly improved by the 142 charger. I will try switching back to the stock cone and see if that makes a difference.

  9. #9
    ptscon's Avatar
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    For reference, when I was still running 159 impeller on my 260 with ET135 and a cam I was seeing 8900+ RPM using Solas 15/19.

  10. #10
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by 1tommygunner1927 View Post
    Try some 1/2" spacers to raise the grab handle/seat and do not use the storage bucket. The S3 hull needs more air!
    Quote Originally Posted by Jkmike View Post
    That's definitely worth a shot with the seat spacers. But short of just removing the storage bucket for testing on purely flat water, i wouldn't want to ride without it. I almost always have to go through chop at some point where i ride and that would make it way to easy for water to get in.

    However, i do have 4 2" Flow Rite vents installed in the ski. 2 under the rear grab handle and 2 up where the cover for the back of the gauge cluster is.

    It will be a noticeable difference without the storage bucket in place. Try it when water conditions allow.

    Are you able to log knock? WOT timing may be too high causing knock and reduced WOT rpm/speed.

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