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  1. #1

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    RPM/Elevation what's yours?

    Hello,

    I was wondering what RPM you guys/gals show at different elevations?

    Mods or Stock?

    Mine is a 2004 RXP 215 I/C S/C

    intake grate, through hull exhaust, opas Block offs, Sponsons.

    At 1500 ft I'm turning 7750-7800 RPM.


  2. #2
    West Texas RXP skoepp's Avatar
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    You want get many replies to your questions as 95% of those on this forum are below 500 ft.
    My experience is aprox 100 rpm for every 900 -1000 ft of elevation.

    You don't have to believe me but I ride at 2200 ft and have run same setup at 500 ft several times and have the data to back it up.

    Just to give you an idea my friends drag car runs 9.1 at 3200 ft. At 500 ft he runs 8.60's.

    All you need is some pitch taken out of your prop or take the time to go closer to the coast and you will see the difference.

    If you go back and read my thread it took me forever and arm and leg to break 80 on stock ecu..
    now days that is nothing but I was really chasing 82 MPH.

  3. #3

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    I believe you i was just trying to see what others had. I'm ordering a Solas 14/19r and a power filter kit to gain some back.

  4. #4
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    More than likely... that 14/19 is gonna be pitched a little high for your set-up-elevation. You may loose even more rpm with that prop over stock.

  5. #5
    West Texas RXP skoepp's Avatar
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    Sorry, didn't mean to come off as a JA.


    I would have to go back thru my data but I think I was running a S3 sc whell with riva front air when I was running the 14/19.

    You first might try taking some pitch out of the trailing edge of prop OEM.
    I'm talking very little tweaking on tailend.
    1.5-2 mm.


    The 1yw4/19 will take more HP to pull as you know.
    It can be reworked to run on your boat but will take more then some fine tuning to the end of blades.
    It can work good but will take a pitch on up the blades to work.
    That means more then most need to attempt.

    Maybe someone out your wat can let you test a 14/19?
    If your OEM prop us true I m guessing 7600 rpm with 14/19.

  6. #6

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    Quote Originally Posted by BigDaddyRXP View Post
    More than likely... that 14/19 is gonna be pitched a little high for your set-up-elevation. You may loose even more rpm with that prop over stock.
    You think I should just do the intake?

    Is there supposed to be some water in the center of the hull under the engine?

  7. #7
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by jdmctr View Post
    You think I should just do the intake?


    Yes and tweak the prop.


    Is there supposed to be some water in the center of the hull under the engine?
    Some.
    But should not be alot with OEM bailers.
    How much when you load your boat and pull the plugs?
    How many hours on that 04.
    If is a decent amount the carbon ring is probably worn.

  8. #8
    JT jpt7779's Avatar
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    skoepp is definitely the Hulk site HIGH Altitude expert on RXP's - period! I highly recommend you send your detailed information to Erik at SpeedFreeks Racing, he will do his magic on your impeller and I guarantee you will be pleased!

  9. #9

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    Quote Originally Posted by skoepp View Post
    Some.
    But should not be alot with OEM bailers.
    How much when you load your boat and pull the plugs?
    How many hours on that 04.
    If is a decent amount the carbon ring is probably worn.
    it has about 62 hours on it... When i open the plugs not much maybe like 1-3 table spoons if that. I think the water might be when i washed out the battery area lol I think it's right in the middle of the hull its not full where it's touching the engine. I would say about a cup maybe

  10. #10
    West Texas RXP skoepp's Avatar
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    +1 on the speed freeks part but not sure about the other.

    If you do invest in a pitch from a pro I would reccomend to send them a solas prop.
    Not worth spending the money on OEM prop. Does not hold shape as good and root angle on solas will out holeshot the OEM prop.
    In that case, buy a 14/19, run it, record rpm, send to Erik with data and when you get it back grin from ear to ear.

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