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  1. #1
    shhr's Avatar
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    RPM`s down new prop

    I changed props on my 05 RXT stage 2 B-KIT and took it for a test

    when I first hit the water my R`s were at 8000-8050 then on the second run they went down to 79-7950 after I ran it for a hour then my R`s went down to 7800-7850 and boost was just over 10 Jerry shimed my SC and it has less than 3 hours, temp today was 85

    do I need to check the SC for slip
    should I just take some pitch out of prop
    I would love to try the headers to really see if I gain RPM`s over the GH box but I would hate to spend that money and not pick up enough R`s

    or I have the Riva ECU if I add the ECU will it give me enough additinal power to turn the prop

    I am close to getting my 05 where I want it just need some help on what to do next


  2. #2
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by shhr View Post
    I changed props on my 05 RXT stage 2 B-KIT and took it for a test

    when I first hit the water my R`s were at 8000-8050 then on the second run they went down to 79-7950 after I ran it for a hour then my R`s went down to 7800-7850 and boost was just over 10 Jerry shimed my SC and it has less than 3 hours, temp today was 85

    do I need to check the SC for slip
    should I just take some pitch out of prop
    I would love to try the headers to really see if I gain RPM`s over the GH box but I would hate to spend that money and not pick up enough R`s

    or I have the Riva ECU if I add the ECU will it give me enough additinal power to turn the prop

    I am close to getting my 05 where I want it just need some help on what to do next
    what prop ?

  3. #3
    shhr's Avatar
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    the new 15/22

    if the x ski`s can turn this then my 05 should be able to really turn it with the B-Kit

  4. #4
    EZ Dock of Long Island Shibby1485's Avatar
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    sounds like a boost leak??

    rpms incrementally DROPPING with each pass...

    10psi with a b-kit at 8000 rpms?

    doesn't add up, something is amiss

  5. #5

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    I bet some heat fade is involved/ boost leak/ clutch slipage.

  6. #6
    shhr's Avatar
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    Hey Shibby

    the 10 PSI was when the R`s were 7800-7850

    my first pass at 8000 my boost was 11.3

    with the other prop I was at 8150 with 11.8-12

  7. #7
    shhr's Avatar
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    does anyone have a extra Rude charger that I could test. I would pay all shipping and some extra as i really want to test the Rude on my set up

  8. #8
    Quote Originally Posted by shhr View Post
    do I need to check the SC for slip

    Thats what I would do before anything else

  9. #9
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by shhr View Post
    Hey Shibby

    the 10 PSI was when the R`s were 7800-7850

    my first pass at 8000 my boost was 11.3

    with the other prop I was at 8150 with 11.8-12
    SHHR your numbers are correct in my opinion. I see that with 7,800 rpm I am in the 10. to 10.5 psi. When turning 8,000 I am arround 11. 4 and with 8,100 close or at 12.0. just my .02

  10. #10
    lextoy's Avatar
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    isnt it usuallly necessary to check the SC slip after it breaks in, lets say at 5 hrs or so???
    it makes sense that it has worn in and is slipping , just needs to be retorqued.
    then should be good to go for a while???
    or is this not standard procedure for a newly rebuilt SC...

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