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  1. #1

    Join Date
    Mar 2009
    Location
    Oceanside NY
    Posts
    9

    Need help any ideas 07RXP

    Hey guys im new to forum I have a 07 RXP
    riva 3" intake
    riva wheel
    riva intake grate
    riva wedge
    VTS ext rod
    Stage 1 - Impeller
    Im 230 lb Long island waters jones inlet 1/3 tank fuel GPS 72mph.


    Over winter added free flow exhaust, water box mod and carbon seal.
    Just last week installed

    XS intercooler
    4" intake no filter
    custom catch can
    new plastic wear ring
    untouched 15/20 solas
    auto meter Boost gauge, rule bilge pump.

    Sunday water 51deg outside temp 60deg I made a few passes top speed was 72.8 @ 8120rpm 1/3 tank fuel I borrowed RXP X injectors from friend. I going to try that and see where im at to pitch prop. I thought i would be at 75mphMy name should be 1SLOWRXP
    ANY IDEAS


  2. #2
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
    Join Date
    Aug 2007
    Location
    Tampa Bay, FL
    Posts
    9,202
    +1
    673
    Drop in an X charger and you'll be 75+ with much better acceleration

  3. #3
    how many rpm r u turing and which riva s/c fan the gen Ior gen II

  4. #4
    JFizzleJR's Avatar
    Join Date
    Aug 2005
    Location
    FL
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    +1
    808
    Quote Originally Posted by yellow jacket View Post
    how many rpm r u turing and which riva s/c fan the gen Ior gen II

    And how much boost?

    ...He says 8120 RPM in his first post.

    Depending on which riva wheel, you might not be very far off from where you should be. An 81 mm ring and perfect RPMs should be worth another .5-1 mph. Did you fill the rideplate and intake grate holes? Did you trim the reverse bucket or atleast make sure the wedge didn't cause an impeding flow of the jet thrust coming from the pump? If you have any Riva supercharger impeller that's NOT the Gen I then you are running LEAN. Especially with those weather conditions!

  5. #5

    Join Date
    Mar 2009
    Location
    Oceanside NY
    Posts
    9
    I think its the gen 1 I got it in 07
    grate an ride plate holes filled
    trimed bucket
    Boost 8-10 psi

  6. #6

    Join Date
    Mar 2009
    Location
    Oceanside NY
    Posts
    9
    what are perfect rpms for my set up. I also was running without the pump cone.

  7. #7
    JFizzleJR's Avatar
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    You have a boost gauge so you should be able to give us a more accurate # than 8-10 psi. If it's the Gen 1 then you shouldn't expect more than 74 MPH. Your RPMs are fine. But if you change to an 81mm venturi nozzle, then you need to make sure you pitch the impeller to get back to 8100-8140..

  8. #8
    EZ Dock of Long Island Shibby1485's Avatar
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    May 2005
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    Long Island, NY
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    oceanside!! right in my neck of the woods... another modded ski on the island, nice

  9. #9
    Coco at Lake Powell Chevtec324's Avatar
    Join Date
    Feb 2009
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    Salt Lake City
    Posts
    48
    Quote Originally Posted by 1fast07RXP View Post
    Hey guys im new to forum I have a 07 RXP
    riva 3" intake
    riva wheel
    riva intake grate
    riva wedge
    VTS ext rod
    Stage 1 - Impeller
    Im 230 lb Long island waters jones inlet 1/3 tank fuel GPS 72mph.

    Over winter added free flow exhaust, water box mod and carbon seal.
    Just last week installed
    XS intercooler
    4" intake no filter
    custom catch can
    new plastic wear ring
    untouched 15/20 solas
    auto meter Boost gauge, rule bilge pump.

    Sunday water 51deg outside temp 60deg I made a few passes top speed was 72.8 @ 8120rpm 1/3 tank fuel I borrowed RXP X injectors from friend. I going to try that and see where im at to pitch prop. I thought i would be at 75mphMy name should be 1SLOWRXP
    ANY IDEAS
    It is obvious that you are looking for top speed, but with all the mods, do you feel that you gained nothing on acceleration or your hole-shot? I am currently thinking of mods to my 07rxp that will improve power, but I am not really concerned with top speed. I am focused on the hole-shot and acceleration. If I spent $2000 on my machine and it launched harder, I would be more happy than spending $1000 for an extra 2 mph at the top end. It seems that most are only concerned about top speed, rarely does someone mention the whole power range of their mods. Weird to me.

  10. #10

    Join Date
    Mar 2009
    Location
    Oceanside NY
    Posts
    9

    Post

    Need help any ideas 07RXP
    Hey guys im new to forum I have a 07 RXP
    riva 3" intake
    riva wheel
    riva intake grate
    riva wedge
    VTS ext rod
    Stage 1 - Impeller
    Im 230 lb Long island waters jones inlet 1/3 tank fuel GPS 72mph.

    Over winter added free flow exhaust, water box mod and carbon seal.
    Just last week installed
    XS intercooler
    4" intake no filter
    custom catch can
    new plastic wear ring
    untouched 15/20 solas
    auto meter Boost gauge, rule bilge pump.

    Sunday water 51deg outside temp 60deg I made a few passes top speed was 72.8 @ 8120rpm 1/3 tank fuel I borrowed RXP X injectors from friend. I going to try that and see where im at to pitch prop. I thought i would be at 75mphMy name should be 1SLOWRXP
    ANY IDEAS

    Thanks to Erick from SpeedFreeks I tryed the RXP X injectors today and improved my hole shot and top speed was 74MPH GPS @8140-8160RPM same conditions as above. Now Ericks going to repitch prop for another 20-40 RPM to bring me to 8180RPM Thanks Erick
    If any one has RXP X injectors or 42s let me know I need a set because the ones I have I borrowed. Thank you
    Last edited by 1fast07RXP; 04-14-2009 at 01:37 AM. Reason: update

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