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  1. #1

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    What injector size does a Rotax Racing ECU expect?

    I just got an 07/08 Rotax "Racing" ECU, 8600 redline, for my RXP-X. What size injectors does this expect to see? I presume the stock 42's will be fine, or should I put 50's in?

    I really need an 02 bung on this thing....


  2. #2

    60's?

    i thought i read on a post that said 60's ........???????

    i know the older ones are set up to do 42's

  3. #3
    Site Admin Green Hulk's Avatar
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    The only Rotax Racing ECU mapped for 60's is the 08 model ECU.

    All other ECU's are mapped for stock injectors. You can run 42's if you need more fueling.

  4. #4

    Fuel Rail?

    Quote Originally Posted by Green Hulk View Post
    The only Rotax Racing ECU mapped for 60's is the 08 model ECU.

    All other ECU's are mapped for stock injectors. You can run 42's if you need more fueling.

    Will he need the fuel rail and the upgraded pump too...?
    http://www.4-tecperformance.com/inde...roducts_id=813

  5. #5

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    I shouldn't need the fuel rail unless I'm going to add alot more boost. The oem fuel system is setup for 11psi at 8000, I didn't figure ~13psi at 8600 would require much more. Just want to get the ECU the injectors its mapped for.

    I was going to leave the stock 42's to start, and bring the 50's with me. Until I can get an 02 bung welded on this thing, I'll be bringing my infrared thermometer to keep an eye on EGT's before and after the ecu swap. This should give me at least a baseline EGT and should clue me in if I'm running WAY lean. If it goes up ALOT I'll put on the 50's see what happens.
    Last edited by boostaholic; 07-23-2008 at 01:48 PM.

  6. #6

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    What size injectors does an 07 Rotax racing ecu expect to see? I've been searching, reading people's sig's and cant find anything. I know the 08 specifys 60lbs injectors, but I cant find anything about what size to use with the 07 and below. Can anyone give me any advice on this? or a user manual for a rotax racing ECU, or anything? Im REALLY trying to avoid having to take the entire exhaust system out and weld in an o2 bung right now.

    Help!

  7. #7
    RXPDAVID's Avatar
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    I believe the stocks still are 38's.

  8. #8
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by boostaholic View Post
    What size injectors does an 07 Rotax racing ecu expect to see?
    Stock 38 lb hr injectors

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