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  1. #1
    David 1 FAST VE's Avatar
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    Question for those with Piggy Back Fuel Controller

    Can you use the stock injectors with the PB or would the duty cycle be to high for them?

    I am going to get Les's B kit and like the PB idea better than the FMU; but I would love to keep the stock injectors if I can and use that money on something else?

    Thanks

    David


  2. #2
    Red Devil's Avatar
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    Re: Question for those with Piggy Back Fuel Controller

    Quote Originally Posted by 1 FAST VE
    Can you use the stock injectors with the PB or would the duty cycle be to high for them?

    I am going to get Les's B kit and like the PB idea better than the FMU; but I would love to keep the stock injectors if I can and use that money on something else?

    Thanks

    David
    David,

    It depends on where the controller is set up. For instance, the one I have from Nils right now is mapped for 42 lbs, and I believe our stock ones are in the upper 30's, so by using Nils' controller with stock injectors I would be running lean. Once I get an accurate reading from the A/F ratio set up, I will let Nils know the readings and he will then get me the correct injectors.

  3. #3
    David 1 FAST VE's Avatar
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    So how do you tune with this thing?

    Any chance of a screen shot of this program so I could see how and what is happeining to make this work?

    I have a buddy that had a system sort of like Jerrys and he said that with almost any injector you could program the spray time in mili seconds and get enough fuel for most set ups.

    He said there does come a point that the injector spraying longer can not supply enough fuel and that the duty cycle is exceded for the injector then you go to a bigger injector and cut the spray time down.

    Does this make any sense with the way Nils's box works?

  4. #4
    Red Devil's Avatar
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    Quote Originally Posted by 1 FAST VE
    So how do you tune with this thing?
    It comes with software and once the controller is powered up, you use your lap top to input the appropriate numbers.

  5. #5

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    ve If you buy the b kit buy the fuel pump from Les you will have alot easier time tuning.

  6. #6
    David 1 FAST VE's Avatar
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    Stan I don't like the idea of the FMU and pump wraped up to keep them dry it seems sort of cheap. No Offense to anybody.

    It seems that with the right map tunning would be easy once you get in the ball park and the set up would be way better looking and maybe even safer.

    I ride pretty hard sometimes and an exposed fuel pump in the hull seems like a bad idea unless you were really safe.

    I could build something that mounted up really well and I may be ok with it but it would have to almost look stock for me to be happy

  7. #7
    David 1 FAST VE's Avatar
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    I wonder if the FMU would work with the stock fuel pump?
    Will it do enough volume or is it the pressure?

  8. #8
    Fast & Loud meeper's Avatar
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    tw

    i think the FMU sends more pressure and for that you need bigger injectors to get the volume ...not sure though...

  9. #9
    David 1 FAST VE's Avatar
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    Maybe someone that knows can help, but it seems that it would only need to restrict the return line as boost went up to get more fuel and under off boost conditions all would be normall.

  10. #10

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    Right now the RXP doesn't have a return to the tank.
    It took injectors over 60 lbs to get enough fuel on top. This made the bottom terrible.

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