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Thread: rpms

  1. #1
    achavanne3's Avatar
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    rpms

    I know we get this a lot BUT... i have an 06 rxp 215 that never reaches the 8100 rpms but gauge says 69 mph.. GPS im reading 65 mph at 6700 rpms. My rpms never vary they are constant at full throttle. I have read multiple posts with same thing and i get different answers. My friend has an 07, he hits 8100 rpms and I keep up with him inch per inch.. Is this the start of a super charger slip? Or am I just a worry bug. Help please.


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    achavanne3's Avatar
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    And yes my supercharger has the steel washers

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    A stock 06 RXP running on 2 cylinders will run right at 6500-6700 rpm, but will not indicate 69 mph on the gauge let alone 65 on GPS-- No way will a STOCK 06 RXP running 6700 run 65 mph on GPS. Are you sure you are not running 7700 RPM?

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    achavanne3's Avatar
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    my bad yes its 7700 lol. typo

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    I've had 8 '06 215s. The 3 most probable areas to look at on your 06 are: Impeller pitch variation, cam timing variation or even a fuel delivery issue. Your ski either has a little extra pitch in the impeller, the cam is not dialed in to achieve peak rpm relative to other variables or the fuel system is starving the motor causing a lean condition that is not allowing for optimal running conditions.

    The only variable listed that is dangerous for your motor is the fueling-- verify that 1 and then play with the other 2 to verify what your ski has or wants.

  6. #6
    TheGunMan's Avatar
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    I have the same issue with my 07 wake. The fuel pressure at idle is 58 psi but did nit tested it at wot

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    achavanne3's Avatar
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    Quote Originally Posted by TheGunMan View Post
    I have the same issue with my 07 wake. The fuel pressure at idle is 58 psi but did nit tested it at wot
    I just don't understand how im going the same speed as an identical ski that's running higher rpms when I'm running lower rpms

  8. #8
    Got Boost? psycho rxp's Avatar
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    Check oil level is in the middle of the 2 bends on the stick
    How many hours on your current wear ring?
    When was the SC slip checked last, & what was it? how many hours on the SC since the last rebuild?
    Don't go buy the speed #'s on the dash they are way off. (Use GPS only)
    check for boost leaks
    the prop, or nose cone can be damaged causing some RPM loss.
    Does your pump bearings spin freely?

    these are just a few things to look for when down on RPMs

    Your prop can be pitched to bring the rpms up, which should gain a few Mph

  9. #9

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    Quote Originally Posted by achavanne3 View Post
    Quote Originally Posted by TheGunMan View Post
    I have the same issue with my 07 wake. The fuel pressure at idle is 58 psi but did nit tested it at wot
    I just don't understand how im going the same speed as an identical ski that's running higher rpms when I'm running lower rpms
    Your ski is running the correct speed for the RPM. The 07 running 8100 RPM AND ONLY 65 has issues-- impeller damage most likely and or wear ring. Maybe he doesn't know about TRIM or doesn't know how to get the most out of his in a race. You should jump on his and GPS it. An 07 RXP in good running condition turning 8100-8180 will run 68-69 on GPS.

  10. #10
    TheGunMan's Avatar
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    Quote Originally Posted by psycho rxp View Post
    Check oil level is in the middle of the 2 bends on the stick
    How many hours on your current wear ring?
    When was the SC slip checked last, & what was it? how many hours on the SC since the last rebuild?
    Don't go buy the speed #'s on the dash they are way off. (Use GPS only)
    check for boost leaks
    the prop, or nose cone can be damaged causing some RPM loss.
    Does your pump bearings spin freely?

    these are just a few things to look for when down on RPMs

    Your prop can be pitched to bring the rpms up, which should gain a few Mph
    frsh SC rebuild by jerry /less than 10 hours/ checked for boost leak. The impeller loogs good but never took the pump out. Total hours if the ski - 55

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