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  1. #1

    stock ecu...no added fuel???

    why cant the stock ecu add fuel when the map sensor (assuming 4 tec has them) senses more boost????

    ex: having a bigger charger????

    is it just not programed with a fuel map past stock boost levels or what?

    i was just thinking


  2. #2
    rick xp's Avatar
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    The ECU only controls fuel up to about 10 psi and then commands 100% duty cycle.

    The Riva ECU is good for i think 13- 14 PSI before it commands 100% duty cycle and at its max fueling for that amount of boost.

    The only way to add more fuel from this point is to add a Rising rate Regulator, Bigger injectors and a Rude Fuel Controller.

  3. #3
    R88ory RXP's Avatar
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    It can and will add fuel upto a point as Rick says but you cant expect the stock ECU to be able to handle 15psi of boost. You can get away with going up 1 size in injectors before your idle becomes an issue.

    R88

  4. #4
    I haven't realy looking into the software of the stock ecu , but we can easily calculate up to what boost level the stock fuelling system can handle , to max out the stock injectors you might need to modify the fuel maps inside the ecu

  5. #5
    R88ory RXP's Avatar
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    Quote Originally Posted by Bruno_Shiftech View Post
    I haven't realy looking into the software of the stock ecu , but we can easily calculate up to what boost level the stock fuelling system can handle , to max out the stock injectors you might need to modify the fuel maps inside the ecu
    The stock ECU already commands 100% duty on the injectors above 8000rpm I believe. Its rare to push injectors that hard normaly dont wana be above 80% but thats just the way Rotax maped the ECUs. R88

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