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Thread: Mod sequence

  1. #1
    ou812's Avatar
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    Mod sequence

    I have some mods to be done to my RXP after the 10 checkup is complete.
    I have a 3" riva intake
    opas BO's
    14/19 3 blade skat & 14/19R concord to compare back to back
    I'm Getting a solas 15/20 & a skat 15/19 too for future mods.

    Right now @ 6.5 hrs I'm seeing 7920 max rpm @ 67.5mph, but avg. is 7880 rpm @ a hair above 67 mph @ 1250 feet above sea level & the water wasn't the best. No glass today.

    I want to do the mods 1 at a time. I want to see the gains by each mod on the same day. Hopefully there will be a tuners beach run soon.

    With all neccessary tools & parts handy, is there enough time in a day to do the 3 simple mods & swap props?

    What's the best sequence to go with?

    I'm thinking:
    Stock run & get #'s
    install the opas B/O's
    install the air intake
    then props.

    I don't have an intake grate yet so whats the better grate without too much top speed loss?

    Where do you think i'll end up on top end/rpm if all install's perform as they are advertised?

    70.5-71 @ 8050-8100 is my guess.


  2. #2
    oklagp1200r's Avatar
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    I have a friend at that altitude that installed the Riva air intake on his stock 66mph RXP and went from 8100rpms to 7900rpms then installed a 13/18 prop and got the rpms back to 8100 and now runs 69.5 with just these two mods! Thats three mph from just two mods

  3. #3
    ou812's Avatar
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    Quote Originally Posted by oklagp1200r View Post
    I have a friend at that altitude that installed the Riva air intake on his stock 66mph RXP and went from 8100rpms to 7900rpms then installed a 13/18 prop and got the rpms back to 8100 and now runs 69.5 with just these two mods! Thats three mph from just two mods
    Hmm, interesting, He lost rpm's with more air flow?

    isn't the 13/18 for the RXT? But hey, if it worked more power to him

    Thats the kind of gains i'd like to see for sure!
    Thanx for the reply

  4. #4
    oklagp1200r's Avatar
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    DAM its been a long day!
    Let me refrase that he added the impeller first and lost rpms from 8100 to 7900 then aded the air intake and gained them back to 8100rpm plus the three more miles per hour! SORRY

  5. #5
    Gotta love this sport! 05Limited's Avatar
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    Quote Originally Posted by oklagp1200r View Post
    DAM its been a long day!
    No problem... we've all had 'em before

    But, now we can all quit scratching our heads

    Jeff

  6. #6
    Moderator The Bandit's Avatar
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    Riva grate is a must (get a discount if you buy it here) no speed loss at all. 14/19r is what you want on it with above said mods.

  7. #7

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    I suggest the first thing you do is replace the ceramic washers. No performance gains but piece of mind.....

  8. #8
    ou812's Avatar
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    I have the washers
    I'll fill the ride plate holes tonite.
    Thanx RXP-Steve, I just ordered the grate. As for the props, I want to see the difference myself. I might like the holeshot & punch from one over the other. If the skat gives better hookup & thrust & is only 1mph slower I'll take it! We'll see.

    How long should it take to install the Riva air intake?

    thanx

  9. #9
    Moderator Insanediego Joe's Avatar
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    The worst part of the air intake install is the front bracket that uses 2 little #8 screws to secure the pipe to the block. No worries, with all of the ability at tuners beach there is plenty of time for those mods and more.

  10. #10
    Moderator Franko's Avatar
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    When I used the Riva air intake, I used zip ties to secure the pipe instead of that bracket. That made it MUCH easier to pull the SC. But if I were you, I would devise your own intake. The Riva is better than stock, but still too restrictive IMO.

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