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Thread: FCA duty cycle questions.

  1. #1
    Senior Member DODGE74's Avatar
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    Default FCA duty cycle questions.

    Guys I'm trying to figure out why I'm only logging 62% of the FCA duty cycle when I have it at 71% on the table. I havent changed anything in the other fuel pressure tables besides the fuel pressure map so everything is like it was stock.

    With it only going to 61% of its max duty cycle my pump is struggling to keep up with my nozzles. I've talked to the pump builder and he thinks that if I could reach the max the pump would be able to support the size of my nozzles.

    Here is a couple of screen shots of my tune file and log.





    Any help would be appreciated.

    Thanks, Gordon
    06 QCLB, DRW
    Single pump
    Single turbo
    EFILive 772hp 1398tq

    gordon@innovativediesel.com

  2. #2
    Lifetime Member 2007 5.9's Avatar
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    What is your mA current at that DC??

    You can adjust the mA current down at that DC to get more fuel out of it.
    Les Szmidt
    2007 5.9 Dodge Ram
    2014 Ram 3500 Aisin tuning Emissions Equipped
    EFI Live Cummins BETA Tester
    Silver Bullet Tuning
    silverbullettuning@gmail.com
    www.youtube.com/ljszmidt
    http://www.facebook.com/SilverBulletTuninig

  3. #3
    Senior Member DODGE74's Avatar
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    Thanks Les,

    here is the screen shot of the FCAmA It goes as low as 718

    06 QCLB, DRW
    Single pump
    Single turbo
    EFILive 772hp 1398tq

    gordon@innovativediesel.com

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    Lifetime Member dansdieselp's Avatar
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    Default FCA duty cycle questions.

    Who's the pump builder?
    Dan's Diesel Performance
    www.dansdieselperformance.com

  5. #5
    Lifetime Member Dmaxink's Avatar
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    Default FCA duty cycle questions.

    The pump doesn't look capable of producing it IMHO... We can see the ECM requesting the larger value and the pump just physically not meeting it. You can try to manipulate the sensor with the milliamps, however, it doesn't look as though the pump is wanting to put out! We have driven Dmax pumps past their limited mm3 per sec and gone out of range on the fuel flow base trying to achieve what you are, but only deemed to aggravate the problem worse. But hey, it doesn't hurt to test right? Lol
    -Kory

    I'm out of ideas? Nah trick... When in doubt, 0xFFFF it out!

    http://www.PPEI.com/

  6. #6
    Senior Member DODGE74's Avatar
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    Quote Originally Posted by dansdieselp View Post
    Who's the pump builder?
    It's Shane's from Motorsport Diesel 10mm stroker pump.


    Thanks Kory, in talking to Shane he felt that since the pump only went to ~62% of the fca duty cycle it still had about 14% of its flow being held back and if I was able to get the fca to go to 71% the pump "should" meet demand. But, I'm not sure and I can't figure out why it won't go to its maximum duty cycle. It should be showing 71% in the log right?
    Last edited by DODGE74; September 13th, 2012 at 12:30 AM.
    06 QCLB, DRW
    Single pump
    Single turbo
    EFILive 772hp 1398tq

    gordon@innovativediesel.com

  7. #7
    Lifetime Member 2007 5.9's Avatar
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    I have adjust the mA table to get 71%...it takes some testing to get it there, but you can
    Les Szmidt
    2007 5.9 Dodge Ram
    2014 Ram 3500 Aisin tuning Emissions Equipped
    EFI Live Cummins BETA Tester
    Silver Bullet Tuning
    silverbullettuning@gmail.com
    www.youtube.com/ljszmidt
    http://www.facebook.com/SilverBulletTuninig

  8. #8
    Senior Member DODGE74's Avatar
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    Quote Originally Posted by 2007 5.9 View Post
    I have adjust the mA table to get 71%...it takes some testing to get it there, but you can
    Thanks Les, ok, I just looked at the mA chart and at 70% its showing "0" and at 60% its showing 770. So I guess at about 62% where I logged its about 718 mA like it showed.

    Where would I start stepping down?

    Should I start a about 50% and start stepping down the mA in 20mA increments till I reach my desired duty cycle?
    06 QCLB, DRW
    Single pump
    Single turbo
    EFILive 772hp 1398tq

    gordon@innovativediesel.com

  9. #9
    Lifetime Member Dmaxink's Avatar
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    Default FCA duty cycle questions.

    Drop 718@60% to 400 and step it from there
    -Kory

    I'm out of ideas? Nah trick... When in doubt, 0xFFFF it out!

    http://www.PPEI.com/

  10. #10
    Senior Member DODGE74's Avatar
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    Thanks kory, I'll give that a shot and see how it does.
    06 QCLB, DRW
    Single pump
    Single turbo
    EFILive 772hp 1398tq

    gordon@innovativediesel.com

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