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  1. #1
    Rustymuscle's Avatar
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    Video: RIVA Racing Spins Yamaha SVHO to 9,000RPM, Makes 375HP On Pump Gas



    Yamaha’s Super Vortex High Output 1,812cc four-cylinder 4-stroke was a power-maker, but to what degree remained somewhat of a trade secret. (We’ve received “unofficial” results that the SVHO in factory trim makes anywhere between 258 and 264 horsepower.)

    While impressive, the real question is what is the SVHO capable of. For that, Scheffield has the answer, “Our target RPM with the [RIVA] Stage 2 SVHO kits is 8,300 for the FZ models, and 8,400 for the FX models.” Yet, for this particular test, Scheffield and crew wondered what the SVHO could do on pump gas (91 octane) at 9,000.

    The post Video: RIVA Racing Spins Yamaha SVHO to 9,000RPM, Makes 375HP On Pump Gas appeared first on The Watercraft Journal.


    More at WatercraftJournal.Com


  2. #2
    Ale's Avatar
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    I think it's on stock wheel...
    no one knows boost pressure at 9000 rpm?

    I'm triing to verify accuracy of this site...
    http://www.mk5cortinaestate.co.uk/calculator3.php
    1812cc 9000rpm 14 psi ... hp calculated by this site is 375hp
    it could be right !

  3. #3
    LugNutLS1's Avatar
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    9000 rpm stock svho wheel will make closer to 18.5-19 psi

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  5. #4
    shrabber's Avatar
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    Not even close!!!! Stock wheel at 9k is 16-17 psi motec, I posted all the info before. That is with stock Cams!!!

    If you don't change the cams You can put a ET24 and not see over 17 psi with a SVHO!!!!!!!

    There is a reason Yamaha went to this restrictive setup!!!

  6. #5
    LugNutLS1's Avatar
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    Going off this curve seems within reason. I seen 14psi at 8150 on stock cam. Going to see tomorrow 8600+ on sho cam and record results

    18 lb @ 8800.
    17 @ 8600.
    15.35 @ 8300
    13.92 @ 8000

  7. #6
    Ale's Avatar
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    Quote Originally Posted by LugNutLS1 View Post
    9000 rpm stock svho wheel will make closer to 18.5-19 psi
    19 PSI at 9000 could be 440 hp

  8. #7
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    Quote Originally Posted by LugNutLS1 View Post
    Going off this curve seems within reason. I seen 14psi at 8150 on stock cam. Going to see tomorrow 8600+ on sho cam and record results

    18 lb @ 8800.
    17 @ 8600.
    15.35 @ 8300
    13.92 @ 8000



    hp calculation...


    18 lb @ 8800. 417 hp
    17 @ 8600. 395 hp
    15.35 @ 8300 362 hp
    13.92 @ 8000 332 hp

  9. #8
    Ale's Avatar
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    Quote Originally Posted by shrabber View Post
    Not even close!!!! Stock wheel at 9k is 16-17 psi motec, I posted all the info before. That is with stock Cams!!!

    If you don't change the cams You can put a ET24 and not see over 17 psi with a SVHO!!!!!!!

    There is a reason Yamaha went to this restrictive setup!!!


    9000 16.5 psi .......... 407 hp (web calculation)

  10. #9
    shrabber's Avatar
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    Quote Originally Posted by LugNutLS1 View Post
    Going off this curve seems within reason. I seen 14psi at 8150 on stock cam. Going to see tomorrow 8600+ on sho cam and record results

    18 lb @ 8800.
    17 @ 8600.
    15.35 @ 8300
    13.92 @ 8000
    Sho cam.... You will net better results!!! I think The stock SVHO WHEEL CAN PRODUCE 17-18 psi at 9k with proper cam setup, and tunning

    I'm going to try it tommorow!! With my supercharger with Modified front housing

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