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  1. #1

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    RXP X Simple Mod

    Hello i would like to know what results can i get on a stock RXP X rs with: Les Cooke 8400 Ecu and X charger or Les Cooke 8400 ecu and Rotax racing impeller for X chager.

    Thanks


  2. #2

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    You will have to increase fuel supply with those mods. Otherwise you motor will become toast.

  3. #3
    R88ory RXP's Avatar
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    Quote Originally Posted by Sundance View Post
    You will have to increase fuel supply with those mods. Otherwise you motor will become toast.
    Yes and no, he will be ok with the 8400 ecu on the stock injectors with the stock charger but if you want more boost then I would have the ECU mapped for 60 injectors

    All that said Les's ECU do tend to run lean but I know quite a few people running them and I have 1, without any problems that I would say are down to running lean. R88

  4. #4

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    I have used the 8400 Les cooke ecu on 08 RXP X and has gone fine. My question is what charger can be used with this Ecu without changing Injectors or anything else.

  5. #5
    Having Fun jp1300r's Avatar
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    Quote Originally Posted by Rober View Post
    I have used the 8400 Les cooke ecu on 08 RXP X and has gone fine. My question is what charger can be used with this Ecu without changing Injectors or anything else.
    Maybe you would get your best answer from Les Cooke to your question. What are you doing with your PX, racing, rec riding?

  6. #6

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    Only your stock charger.

  7. #7
    R88ory RXP's Avatar
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    Quote Originally Posted by Sundance View Post
    Only your stock charger.
    +1 I think the same would apply if you went with the riva upgrade wheel that you could run the 50s. In all fairness the only way to be sure is to monitor your AF, R88

  8. #8
    richrxp's Avatar
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    Quote Originally Posted by R88ory RXP View Post
    +1 I think the same would apply if you went with the riva upgrade wheel that you could run the 50s. In all fairness the only way to be sure is to monitor your AF, R88
    I must agree ,afr is most important.

    This way you will know if your on the safe site.

    You have so many options to fuel your set up,first test and read your afr and go on from there.

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