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  1. #1
    danieletrono's Avatar
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    Discussion about RxpX Mods

    Is it better( the most incrise of hp and performance) to change in an rxpx:
    - the S/C impeller( which one is the best?) with a stock rxpx OR
    - put new piston in the engine custom made with a increase of cc of 50cc each one( 1492+ 150cc) with a stock engine OR
    - put a new rota ecu 8800 with riva valvetrain upgrade and new titan valves( which are the best titan valves?where to buy?)

    What is your opinion?


  2. #2
    Site Admin Green Hulk's Avatar
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    I wouldn't bother with replacing the pistons. The stock pistons are Mahle pistons and are very good pistons. You will see greater gains from increasing boost by modifying the supercharger and adding an ECU to increase RPM's.

    You have several supercharger options and a couple of ECU options.

    You can run the Riva or Rotax Racing X model supercharger upgrades with either the Rotax Racing or Riva ECU
    http://www.4-tecperformance.com/inde...roducts_id=995

    http://www.4-tecperformance.com/inde...roducts_id=760

    Remember that with the Riva ECU you must use the 50 lb injectors and the Riva valve train upgrade.

    With the Rotax Racing 08 ECU you must use the 60 lb injectors, Riva valve train upgrade AND lightweight valves. Ferrea is the top brand in valves and can be found here
    http://www.4-tecperformance.com/inde...roducts_id=527

    If you want even more performance than the Riva or Rotax Racing supercharger upgrades can provide you can install a 2rude charger
    http://www.4-tecperformance.com/inde...roducts_id=454

    The 2Rude supercharger will exceed the fueling capabilities of either the Riva or Rotax Racing ECU and will need to do the rising rate fuel pressure regulator upgrade as shown here
    http://www.4-tecperformance.com/inde...roducts_id=880



  3. #3
    danieletrono's Avatar
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    Are these ferrera valves made in titan or stain??
    Isn't better titan valves?


    So the piston is not a good idea....
    Tnx

  4. #4
    is thinking. grantuk's Avatar
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    Quote Originally Posted by Green Hulk View Post

    The 2Rude supercharger will exceed the fueling capabilities of either the Riva or Rotax Racing ECU and will need to do the rising rate fuel pressure regulator upgrade as shown here
    http://www.4-tecperformance.com/inde...roducts_id=880

    Will it really exceed the capabilities of the RR ecu and 60lbs injectors?

    Malte said this combo was good for 330hp

  5. #5
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by danieletrono View Post
    Are these ferrera valves made in titan or stain??
    Isn't better titan valves?


    So the piston is not a good idea....
    Tnx
    They are neither titanium or stainless. They are what Ferrea calls "super alloy"

    They are very light and very strong.

    Quote Originally Posted by From Ferrea's website
    Ferrea super alloy valves... represent the highest level of sophistication in valve technology. We proudly introduced the next generation of extreme heat resistant valves, specifically developed to withstand the brutal punishment of NHRA Top Fuel and Funny Car applications. We have developed a specially processed high nickel-based alloy, and a unique heat-treatment process, which yields extreme heat resistance and enormous tensile strength properties, (far beyond conventional Inconel materials). These extraordinary valves will set the standards for all Supercharged, Turbocharged, Nitrous Oxide, Off-Shore Marine or 9.0 compressin restricted race motors. Many Top Fuel Dragster and Funny Car teams can confirm the performance and reliability of these new valves which are now available for many engine combinations including NASCAR, Sprint Car, Drag Race, and Off-Shore Marine applications.

  6. #6
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by grantuk View Post
    Will it really exceed the capabilities of the RR ecu and 60lbs injectors?

    Malte said this combo was good for 330hp
    Yes, it will really exceed the capabilities. Many here are running the 8800 RPM ECU with 60 lb injectors along with the 2rude charger or ET charger and are still having to use a RRFPR or electronic Rude fuel controller to keep the AFR at a safe level.

  7. #7
    SHO stopper palmbeach jesse's Avatar
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    I am running the rotax 8800 and the 2rude...
    I have to run a rude fuel controller and piggy back a rrfpr...
    It hauls ass!!! And its safe to run...
    If you get these parts, you will be very fast!!!!

  8. #8
    danieletrono's Avatar
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    Do you have some data? Speed? Do you have a rxpx?

  9. #9
    danieletrono's Avatar
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    In a rxpx i can buy the whole 2 rude sc or only the impeller to put inside my x sc? I can put only the 2 rude sc in my px with stock rxpx and rffr?

  10. #10
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by danieletrono View Post
    In a rxpx i can buy the whole 2 rude sc or only the impeller to put inside my x sc? I can put only the 2 rude sc in my px with stock rxpx and rffr?
    You will need the entire 2rude charger. The 2rude impeller will not fit into your X charger.

    Yes, you can install the 2rude supercharger along with the RRFPR on your X model ski and still run the stock injectors and ECU. Stock injectors on X models are 42 lb.

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