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Thread: Speed Calculator

  1. #11
    Join Date
    Jun 2005
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    Illinois
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    4,104
    Originally posted by exrider008
    stock gearing on a 400ex is 15/38 right?
    si
    406ex - January '13 QOTM

  2. #12
    Join Date
    Jun 2004
    Location
    Madison, WI
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    1,644
    Originally posted by BlasterEaten250
    i guess if you add a new rev limiter to a 400 you can go 81 mph.
    Yup, on the project 450R Harlen put a vortex ignition (+1000 RPM) on and he gained 11 mph measured by a dyno.
    Research Assistant
    Engine Research Center
    University of Wisconsin-Madison
    Department of Mechanical Engineering

    2003 400ex
    2005 Arctic Cat F7 EFI

  3. #13
    Join Date
    Dec 2005
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    franklin tn
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    that's all fine and well, but somewhere along the lines you have to have the horsepower available at the given rpm to overcome wind resistance, rolling resistance, and friction (assuming that you are running on flat ground.)

  4. #14
    Join Date
    Jan 2006
    Location
    Martinsville,IN
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    Originally posted by spent21
    that's all fine and well, but somewhere along the lines you have to have the horsepower available at the given rpm to overcome wind resistance, rolling resistance, and friction (assuming that you are running on flat ground.)
    Yeah. theres a lot of variables.

    BTW, when it asks for how tall the tire is, is it front or back, or does it make a difference?

    The fronts on my Raptor are 20s but the backs are 19s.

  5. #15
    Join Date
    Jan 2006
    Location
    ionia,michigan
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    422
    Originally posted by spent21
    that's all fine and well, but somewhere along the lines you have to have the horsepower available at the given rpm to overcome wind resistance, rolling resistance, and friction (assuming that you are running on flat ground.)
    yeppers,theoritical speed and real world speed are just a bit different.
    05 400ex 2mm over,11.5:1 or so,a little head work,sparks x-6,flexx,frame work,subframe work,rewired custom wire harness(electronics on airbox),custom reverse system, tapered bearings in rear,Elka triple,comp/rebound,+3 burgard and orange electrical tape on a cheap dura-break aahhmm durablue posi-lock nut. and a few other things....

  6. #16
    Join Date
    Aug 2005
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    baton rouge
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    the calculator assumes you have enough power to pull the gearing tha you use. if you give a 100hp motor the same gearing as an xr50, then the top speed will still be the same. and the rear tire are the only ones that make a difference, bigger tires = taller gearing

  7. #17
    Join Date
    Jun 2004
    Location
    Madison, WI
    Posts
    1,644
    Originally posted by Quad Boy 660r
    Yeah. theres a lot of variables.

    BTW, when it asks for how tall the tire is, is it front or back, or does it make a difference?

    The fronts on my Raptor are 20s but the backs are 19s.
    It wants your rear tire height.
    Research Assistant
    Engine Research Center
    University of Wisconsin-Madison
    Department of Mechanical Engineering

    2003 400ex
    2005 Arctic Cat F7 EFI

  8. #18
    Join Date
    Apr 2005
    Location
    KC, Missouri
    Posts
    5,225
    Originally posted by 300exrider15
    can u do that for a 300 ex
    Use the "generic calculator" link at the bottom of the page and fill it out using the first window to setup for a stock 300ex. Then from there just change tire sizes and sprocket sizes for a comparison.
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    Brandon -O||||O-
    1998 Honda TRX300EX (330)

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