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  1. #1

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    2012 rxp-x lost rpm question

    so last weekend, stock 2012 rxp-x, flashed to 8350 vtech beta, 70 degrees, 70% humidity, 2 bars fuel, best run of 71.6 mph at 8340-8360 rpm (on the limiter).

    last night, added 15/20r to bring down r's off the limiter . . . this morning 70 degrees, 90% humidity, half tank fuel, best run of 70.6 mph, 7840-7860 rpm.

    i am assuming that the high humidity is probably killing rpms by 150 or so but is it reasonable to assume that the prop brought it down another 300? i was hoping to see that the prop would put me in the 8200 range . . . alll hoses seem tight so i don't there are any boost leaks . . .next plan is to add 4" kanaflex . . . thanks in advance for input.


  2. #2
    Mod less, ride more! troyheb's Avatar
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    Add the kano

  3. #3

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    Quote Originally Posted by troyheb View Post
    Add the kano
    thanks, sounds like the plan. just took the stock 90 hour 08 rxt-x for a rip and she made 8040 rpm no problem . . . guess that throws out my humidity theory/excuse . . .

  4. #4
    ADAMBOMB's Avatar
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    Repitch! If you plan to keep your current mods..

  5. #5
    ADAMBOMB's Avatar
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    Quote Originally Posted by RobKman View Post
    thanks, sounds like the plan. just took the stock 90 hour 08 rxt-x for a rip and she made 8040 rpm no problem . . . guess that throws out my humidity theory/excuse . . .
    Has nothing to do with weather. Its the prop you just installed..

  6. #6
    wotxxxsd's Avatar
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    Pitch your prop.
    It's amazing what a tuned prop can do....

  7. #7
    Mod less, ride more! troyheb's Avatar
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    Add the kano, then repitch if nessary

  8. #8

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    Quote Originally Posted by ADAMBOMB View Post
    Has nothing to do with weather. Its the prop you just installed..

    i know it's the prop but i was surprised that i lost 500 rpm over the last time i was out due to it . . . i was expecting a couple hundred. what is the stock 12 rxp-x pitch? i have lost some rpm before on the 08 t-x when hot/humid so i was figuring some loss was due to that but it does not seem that way.

    will install kanaflex this week and then see where i am at after that . . . repitch if necessary. thanks for the replies.

  9. #9

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    btw, what size hose is on the crankcase breather? 1/2" or 5/8"? thanks.

  10. #10
    Vman's Avatar
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    Quote Originally Posted by RobKman View Post
    btw, what size hose is on the crankcase breather? 1/2" or 5/8"? thanks.
    3/4" ID.

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