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  1. #1

    Advice on 12 rxpx and speed and RPMS

    Okay 12 rxpx, 4 inch intake, 8250 vtech tune and 15/20R prop. I am getting 71 consistently Rpm is solid at 7800 with spikes up to 8200. But mostly solid at 7800 when hitting 71-72 mph.

    Do i need a repitch? if i repitch will i get a few more Mph?

  2. #2

    Join Date
    Aug 2010
    I was in the same boat as you...started with the 8350 tune and best speed of 71.5 at 8340-8360 rpm. Added an untouched 15/20r and rpm dropped to 7800 with speed of 72. Added a 4 inch intake and picked up 150 rpm and a little speed. Sent the prop to Eric at speed freaks and he repitched it...end result was 8300-8340 rpm at 75 mph. Eric said prop pitch was all over the place...I think he repitched it to a 12.5/19.

  3. #3
    Mod less, ride more! troyheb's Avatar
    Join Date
    Jul 2007
    Nederland, Texas
    Quote Originally Posted by budman5201 View Post
    Do i need a repitch? if i repitch will i get a few more Mph?
    Yes. Yes.

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