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  1. #1
    DaveC's Avatar
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    Input on '11 RXP X mods

    Looking for suggestions for a budget build on a '11 RXP X. Have the usual parts,

    4" front air
    R&D intake grate
    Riva wedge with VTS extension rod
    catch can
    Solas 15/21
    83mm RXP nozzle
    trimmed bucket & filled holes
    flame arrestor removed

    Best of 74.4 at 8040 RPMs. Would like to be in the 77-78 mph with stock ECU, supercharger, injectors etc.
    Last edited by DaveC; 08-21-2012 at 12:42 AM.


  2. #2

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    my ski liked the 160 thermostat mod.

  3. #3
    Mod less, ride more! troyheb's Avatar
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    With your mods in the weather you are riding in your speed sound just about right.
    When I had basically the same mods on my 08, my speed was around that in the summer.
    Have you thought about pulling the FA?

  4. #4
    DaveC's Avatar
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    It is a good mod jim, but most here have not changed them on the budget builds.

  5. #5
    DaveC's Avatar
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    Yes I have Troy. I have been reading over some of the posts from the guys that have removed them. From that I was not sure if it was worth removing or not as some posted it did not really make a difference.



    Quote Originally Posted by troyheb View Post
    With your mods in the weather you are riding in your speed sound just about right.
    When I had basically the same mods on my 08, my speed was around that in the summer.
    Have you thought about pulling the FA?

  6. #6
    Mod less, ride more! troyheb's Avatar
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    Imo, it does make a difference. I also looked at it this way. It took me about 2hrs to remove the mani, pull the FA and reinstall the mani. It cant hurt nothing and I may pick up 50-100 rpm for my time. Oh and it was free to do.

  7. #7

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    Quote Originally Posted by DaveC View Post
    It is a good mod jim, but most here have not changed them on the budget builds.
    The cost for the 160 thermostat mod is less than $50-- $25 for the thermostat shipped to your house, $15 or less for the new anti freeze (or reuse your old stuff that came out) and some stainless fasteners for the mod itself.

    1 of the least expensive 150 rpms I have seen with gains from bottom to top in warm water and warm temps.

  8. #8
    DaveC's Avatar
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    I have used the Rotax Racing theromostats previously and believe they do help. Not sure that I ever seen a 150 RPM gain from them but probably would with the thermo mod and a better IC. The Riva mod is considerably cheaper, may try it on a spare thermo that I have.


    Quote Originally Posted by jim View Post
    The cost for the 160 thermostat mod is less than $50-- $25 for the thermostat shipped to your house, $15 or less for the new anti freeze (or reuse your old stuff that came out) and some stainless fasteners for the mod itself.

    1 of the least expensive 150 rpms I have seen with gains from bottom to top in warm water and warm temps.

  9. #9

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    Riva 160 thermo mod is expensive at $180 + shipping. The DIY 160 thermo is the smart $$ choice. If you subtract off the $15 as mentioned in the $50 projected cost for antifreeze and call that maintance, the mod itself turns into $35 or less vs. $200

    http://www.greenhulk.net/forums/showthread.php?t=6097

  10. #10
    DaveC's Avatar
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    Thanks for the link jim !


    Troy I went back into my notes a bit and found during my conversation with Erik at SFR that he also recommends the FA removal. I got it pulled out, what a pain in the ass that job was. But as most of you guys said, it can only help.

    I may try another adjustment to the Riva VTS extension rod to see what results I get.


    Quote Originally Posted by jim View Post
    Riva 160 thermo mod is expensive at $180 + shipping. The DIY 160 thermo is the smart $$ choice. If you subtract off the $15 as mentioned in the $50 projected cost for antifreeze and call that maintance, the mod itself turns into $35 or less vs. $200

    http://www.greenhulk.net/forums/showthread.php?t=6097

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