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  1. #1
    Join Date
    Mar 2016
    Posts
    19

    Default Adding Top End MPH - 89 Supra Comp

    I'm looking to add 2 MPH to my current top speed of 42 MPH. I'd love to get to 44-45 MPH but i don't know if it's possible... Acme is telling me I may gain 1/2 MPH with a Reverse output 1442 larger prop but not sure that is worth the additional investment. Any other suggestions? I appreciate any direction or insight that you could provide - Thank you

    1989 Supra Comp
    Ford 351 – Windsor Engine
    Reverse output (I think)
    Transmission is the 1.23:1
    4200 RPM’s fully open with current Acme propeller set up
    42MPH Top Speed with Current Acme propeller set up
    Current Prop: Acme 598 13 x 14V R1 37M

  2. #2
    Join Date
    Jul 2010
    Location
    N.W. Suburbs Chicago, IL
    Posts
    2,307

    Default

    Are you trying to barefoot? 42MPH is plenty fast for these hull types. I know mine can hit 44-45 but those last few MPHs get rather “exciting.”
    '86 Comp TS6M - Reborn 2016
    Riding a HO Sports CX Ski

  3. #3
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
    Posts
    2,742

    Default

    You can try waxing the bottom . Overtons used to sell a super slick wax for hull bottoms, It is very tough to get those last couple MPH.

  4. #4
    Join Date
    Mar 2016
    Posts
    19

    Default

    Quote Originally Posted by Jetlink View Post
    Are you trying to barefoot? 42MPH is plenty fast for these hull types. I know mine can hit 44-45 but those last few MPHs get rather “exciting.”
    Yes, 42 MPH is fast enough to barefoot for me but 1 or 2 MPH would be more comfortable for one foots. I do understand the "exciting" part of 44-45 MPH... When I stand up the speed will drop to 42 or 43 MPH which is where I would really like to be.

  5. #5
    Join Date
    Mar 2016
    Posts
    19

    Default

    Quote Originally Posted by michael hunter View Post
    You can try waxing the bottom . Overtons used to sell a super slick wax for hull bottoms, It is very tough to get those last couple MPH.
    Thanks, I'll take a look at this option...

  6. #6
    Join Date
    Feb 2004
    Location
    Northwest Missouri, St. Joseph
    Posts
    88

    Default

    I put some GT-40P heads, a Performer RPM manifold, and Pertronix ignition, on mine and I gasket matched the mating surfaces.
    Got it up to 44-45 mph, not much gain, but it really sounds good!
    agetech
    89 Comp
    Restored to "Better than New"

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