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  1. #1
    Resident Jicky Jack Jeff C's Avatar
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    Supercharged sleds getting 220 hp from Supercharger

    How come a Yammie Apex Snowmobile 900CC supercharged can build 220 hp on pump gas, and our 1500 CC Seadoos are only building 215 HP?

    600 more CC's on the SeaDoo, and producing the same HP?

    Why?


  2. #2
    Moderator boataddict's Avatar
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    It would be interesting to check the torque on both motors. i am guessing that the doo would be much higher.

  3. #3
    Prohibido usuario
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    More than likely torque. The snomobile has a transmission.

  4. #4
    JeffC, that's a modded Apex correct?

    I'd love to ride that sled though.


    You ever ride the Apex, Apex GT, or Apex RTX? I wonder how they ride? My uncle has the Yami Nytro, but I haven't rode it yet.

  5. #5
    Resident Jicky Jack Jeff C's Avatar
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    Red face

    Quote Originally Posted by RXPkid View Post
    JeffC, that's a modded Apex correct?

    I'd love to ride that sled though.


    You ever ride the Apex, Apex GT, or Apex RTX? I wonder how they ride? My uncle has the Yami Nytro, but I haven't rode it yet.

    I got a buddy with an APEX turbo. 260 HP monster!

    Rode it out in Idaho in the mountains last year. You could literally go almost anywhere you wanted if you had balls big enough. It took some getting used to, as your track was wheelieing up the mountain with about 1/4th of it touching the snow.

    I got into trouble a few times going much higher than I really should have, and I lost my bailout position on the hill and only had one choice but to keep going and make it to the top or stop, flip over backwards and have the sled roll for about 2,000 feet. I made it but my legs were wobbly for about an hour afterwards. It was an all or nothing scenario.

    Never had gotten into that predicament on my 99' Summit 670 HO. Not enough HP up at 10,000 feet to go high enough to get into that much trouble.

  6. #6
    Resident Jicky Jack Jeff C's Avatar
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    If anyone wants to see how these turbo yammies go up in the mountains click on this link and watch the Thunderstruck 4, 4.5, and 5 teasers.

    I have met these guys, rode with a few of them, and most of them are completely nuts!

    http://bigskyx.com/bsx_video_gallery.html

  7. #7
    Resident Jicky Jack Jeff C's Avatar
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    Here is a dyno sheet. What do you make of this?


  8. #8
    Legend in my own mind Sirhc7897's Avatar
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    Their tq is much lower and their rpms much higher...

    Extrapolate their hp and tq numbers between 8000-8100 (where the doo motors are running for the most part) and you will see picture...

    They're building big hp through rpms and the doo can't do it because of the pump efficiency issue...

  9. #9
    Resident Jicky Jack Jeff C's Avatar
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    Quote Originally Posted by Sirhc7897 View Post
    Their tq is much lower and their rpms much higher...

    Extrapolate their hp and tq numbers between 8000-8100 (where the doo motors are running for the most part) and you will see picture...

    They're building big hp through rpms and the doo can't do it because of the pump efficiency issue...

    So at 8000 rpm's it looks like the yammie is putting out +-180 HP on a 900 CC motor.

    A 1500 CC motor should be right around 300 HP at the same RPM's then right?

    180 hp X
    900CC 1500 CC

    Cross multiply that and divide it comes in at 300 HP at 8,000 rpm's.......

    Or can't I take that leap of logic?

    Yammie motor = .2 hp per cc @8,000 rpms
    Seadoo motor = .14 hp per cc @ 8,000 rpm's

    29% more power per CC........

    What am I not realizing here? Someone hit me on the head!!!
    Last edited by Jeff C; 10-25-2006 at 04:56 PM.

  10. #10
    captain obvious Lurker's Avatar
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    Quote Originally Posted by Jeff C View Post
    So at 8000 rpm's it looks like the yammie is putting out +-180 HP on a 900 CC motor.

    A 1500 CC motor should be right around 300 HP at the same RPM's then right?

    180 hp X
    900CC 1500 CC

    Cross multiply that and divide it comes in at 300 HP at 8,000 rpm's.......

    Or can't I take that leap of logic?

    Yammie motor = .2 hp per cc @8,000 rpms
    Seadoo motor = .14 hp per cc @ 8,000 rpm's

    29% more power per CC........

    What am I not realizing here? Someone hit me on the head!!!
    You are missing a lot of the other variables, temperatures, boost pressures, computer mapping, ect.

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