Freestyle 300sx/750 conversion. What Impeller???

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  1. #1
    Resident Guru sportsfreak29's Avatar
    Join Date
    Oct 2011
    Midland, Tx.

    Freestyle 300sx/750 conversion. What Impeller???

    Need some advice on which impeller to use.

    Ski specs:
    300sx hull.
    Rhaas 750 pump beta kit with trim.
    SP 750sx engine with a #20 cylinder ported for somewhere closer to freestyle than Rec.
    Ported cases.
    Dual 40mm SXR carbs.
    185 psi compression with re-machined OP swirl head.
    Advent ignition and lightened flywheel.
    New Factory Pipe 650sx, Limited or Mod or PJS 750 modded to fit. (Not sure which exhaust will be used but planning to test all 3.)

    Looking for a BOB build and want the best bottom end possible.

    Any suggestions on a choice of impeller for this monster?
    If you're not crashing, then you're not trying!!!

    '90 650sx, full mod with all the bells and whistles.
    '84 JS550/650 pump swap with Viper 9000 motor.
    '93 550sx with a 650sx motor and Rhass pump kit.
    '81 JS440, full mod 550 PP motor. '
    '93 300sx/750 SP BOB.

    Special thanks to Chris Newmiller, the guys at Prowatercraft Racing, Rhaas Products, and Mitchell at M&M Marine!

  2. #2 Is My Home Away From Home Rushford_Ripper's Avatar
    Join Date
    Dec 2009

    Re: Freestyle 300sx/750 conversion. What Impeller???

    Hooker 9/15, ran one in my BOB with 701 62t/b-pipe and pump cone, it was a great setup
    Last edited by Rushford_Ripper; 02-01-2018 at 05:07 PM.

  3. #3
    Resident Guru
    Join Date
    Sep 2015
    Northern Michigan

    Re: Freestyle 300sx/750 conversion. What Impeller???

    I would go 10/16 hooker, I had it on my nearly identical set up. Look at water injection, there is a huge amount of low end to be had with a single line plumbed in near the end of the elbow.
    Last edited by Hydro-Mike; 02-02-2018 at 06:20 PM.

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