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  1. #1
    skigolfnut's Avatar
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    New X Charger Install

    I have a 2006 RXP, I put in the new X-Charger, and the 42# injectors, and the 15/20 solas prop, with a new wear ring, I also installed the riva rear air, and I have the opas removed and Riva Sponsons for bouy racing,
    With Gps I had it up to about 70mph with a full tank of fuel, trimmed all the way up,
    The RPM's would only get up to about 7800 or 7900??

    Sould I be getting more? if so how?
    Would the Riva Grate help??

    It runs strong but I am seeing better speeds from less from some of the other members?
    Thanks,


  2. #2
    mrbtd's Avatar
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    Do you have the prefilter on the intake ? If so remove it and replace with a screen

  3. #3
    skigolfnut's Avatar
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    I have just the screen mesh only,
    I was thinking of filling the holes in the ride plate,

  4. #4
    Sturm215's Avatar
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    Quote Originally Posted by skigolfnut View Post
    I have just the screen mesh only,
    I was thinking of filling the holes in the ride plate,
    rpm's are down slightly.. ? need Rpms up to 8100 , i'd switch to riva grate check over everything in the pump.... what were rpms before you changed charger? is this charger brand new? Whats Air temp? you won't see a huge difference with filling ride plate holes. If everything checks out fine and you still don't have enough RPM's i'd switch to 14/19 for summer and use that 15/20 for winter cooler air if you are going to stick with internal intercooler. Good luck.

    check spark plugs also.

  5. #5
    WBoulton's Avatar
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    Mine did the same thing, I was using a 15/22 prop though. I switch to an 87mm nozzle and this solved the problem. I haven't gps'd the ski since, but it'll pull 8100+ now. Hole shot is good but I have a little to much cavitation. I think an 85mm nozzle would be perfect.

  6. #6
    skigolfnut's Avatar
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    It was a record 98 degrees and 95% humidity,
    the x charger had 5 hours on it with the new metal washers,
    I was thing of going with the external intercooler but then I need the rising rate fule thing,

    thanks,

  7. #7
    MSRXP's Avatar
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    Quote Originally Posted by WBoulton View Post
    Mine did the same thing, I was using a 15/22 prop though. I switch to an 87mm nozzle and this solved the problem. I haven't gps'd the ski since, but it'll pull 8100+ now. Hole shot is good but I have a little to much cavitation. I think an 85mm nozzle would be perfect.
    The stock on the RXP is an 83mm nozzle.... The x-skis are the 87mm nozzle's. You should put an 81 in and pitch for it. Best speeds..

  8. #8
    WBoulton's Avatar
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    I would but I'm going to do an intercooler soon, then Ill switch the rings back out.

  9. #9
    Sturm215's Avatar
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    Quote Originally Posted by WBoulton View Post
    I would but I'm going to do an intercooler soon, then Ill switch the rings back out.
    Yah the rings are really for dialing it in...... With that heat and humidity you need a smaller impeller 14/19... is the way I'd go. it will bring those rpms back up along with speed. When it gets cooler there and your rpms get too high switch blades again to 15/20.

  10. #10
    Sturm215's Avatar
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    Quote Originally Posted by WBoulton View Post
    Mine did the same thing, I was using a 15/22 prop though. I switch to an 87mm nozzle and this solved the problem. I haven't gps'd the ski since, but it'll pull 8100+ now. Hole shot is good but I have a little to much cavitation. I think an 85mm nozzle would be perfect.
    Thats kind of like putting a band aid on changing the prop in my opinion... 15/22 is way over prop'd for stock intercooler at least and the heat which is why you had to use a 87mm to get by and probably hurting top end pretty bad. Your choice though

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