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  1. #1
    gp1200rider's Avatar
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    New pistons from Wiseco 10.1 Ratio

    Any thought from motor builders On these new Pistons from wiseco 10.1 ratio ,I know some people on here are running Cp 9.5/1 ratio etc , Im wondering how good these would be with low boost less than 15lbs
    any thoughts

    http://www.wiseco.com/PDFs/SeaDooRXP1500.pdf


  2. #2
    imp0ster's Avatar
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    the added heat is not worth the measly power gain you'll see IMO. You usually up the compression to make up for the inefficiency of your power adder. In the case of a ET wheel, it's not that inefficient. You run more of a risk of a chipped/destroyed piston.

  3. #3
    boost junkie skidoochris's Avatar
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    10:1 will work no problem but the timing for pump fuel maybe a big problem
    the power increase will be most noticeable off boost
    if I would have know about them I would have tried them
    I have ran 11:1 with a turbo before....its all in the tune

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  5. #4
    westy's Avatar
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    Quote Originally Posted by skidoochris View Post
    10:1 will work no problem but the timing for pump fuel maybe a big problem
    the power increase will be most noticeable off boost
    if I would have know about them I would have tried them
    ....its all in the tune
    +1

  6. #5
    imp0ster's Avatar
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    11:1 on these engines? I ran 9.5:1 JE Forged in my TVS 2.3 powered 3.8 @ 17lbs and had to drop to 16* of timing from the 8.4 pistons at 20 degrees. I saw about 7whp increase. on a 3.8L.

  7. #6
    boost junkie skidoochris's Avatar
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    as I said the power off boost is what is improved
    I am also not recommending 11:1 but I run e-85 so its not a problem for me
    if you dump in race fuel you may have been able to run the same or higher timing for max hp

  8. #7
    Mothman's Avatar
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    Click image for larger version. 

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    8.4:1 stock
    9.5:1 Riva
    11:1 CP

    The 10:1 must have a small pocket. Any pics?

  9. #8
    gp1200rider's Avatar
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    Good info 11.1 Cp ? theres a pic of it on the PDF file above

  10. #9
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    CP will make any ratio you want.

  11. #10
    Mothman's Avatar
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    It won't open for me.
    Yep, 11:1's. If my ride decides to start, I'll let you guys know how they perform. lol
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