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  1. #1
    RNX's Avatar
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    Riva ECU or Rotax Racing ECU?

    What is the difference between these two? Which one should i get? Pros and Cons? Thank you!


  2. #2
    TERRY bigbuck12345's Avatar
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    i believe the riva still has knock control which is a good option

  3. #3
    Site Admin Green Hulk's Avatar
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    Both perform great!

    Difference are:

    Riva and Rotax Racing ECU's both have 8650 Rev limit
    Rotax is mapped for stock injectors. Riva is mapped for 50 lb injectors.

    The Riva is boost sensitive and can handle up to about 13.5 psi boost before needing to also run a RRFPR.

    With the Riva ECU you surrender your warranty if it's still in effect.

    The Rotax Racing ECU does not have knock control, the Riva does.
    Riva also maintains all stock ECU fail safes and can communicate with BUDS for diagnostic purposes.

    The 08 Rotax Racing ECU has 8800 rev limit and is mapped for 60 lb injectors. Still does not have knock control and cannot communicate with BUDS.

  4. #4
    RNX's Avatar
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    Thanks for the detail answer. What is knock control? What about DESS key? I saw Rotax Racing ECU for sale which works with any key. Is it possible?

  5. #5
    TERRY bigbuck12345's Avatar
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    dang jerry your up early lol

  6. #6
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by RNX View Post
    Thanks for the detail answer. What is knock control? What about DESS key? I saw Rotax Racing ECU for sale which works with any key. Is it possible?
    Knock control works with the knock sensor to retard timing in case the engine starts to detonate. It's a very important feature to have on a high boost engine.

    Any lanyard will work with the rotax racing ECU.

    With the Riva ECU your lanyards must be programmed. Just like a stock ECU.

  7. #7
    RNX's Avatar
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    Now i'm running stock ecu with vortex fuel regulator, 42s injectors and b-kit supercharger if i get rotax racing ecu should i have to change something else except valve train upgrade?

  8. #8
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by RNX View Post
    Now i'm running stock ecu with vortex fuel regulator, 42s injectors and b-kit supercharger if i get rotax racing ecu should i have to change something else except valve train upgrade?

    Just valvetrain upgrade.

    You can run the 42's with the RR ECU

  9. #9
    KC Blue Thunder's Avatar
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    I know that with the Riva ECu it has to be activated thru the BUDS system thus voiding your warraty... Is this the case too with the Rotax ? Will it also void your warranty ?
    Last edited by Blue Thunder; 08-19-2009 at 09:20 AM. Reason: spelling

  10. #10
    RNX's Avatar
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    As i understand from Jerry post only Riva ECU voids warranty.

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