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Thread: DFCO settings

  1. #1
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    Default DFCO settings

    Did anybody play with the DFCO settings to archive better mpg?
    If yes, what is the best strategy to sqeeze a few more miles out of the gallon?

    Harald
    If nobody has done it before, somebody has to do it....

    1997 Tahoe 2dr 4WD
    2002 Alfa Romeo Sportswagon 2.0 JTD
    1982 Deutz Intrac 2004A
    2003 friesian Horse " Henry"

  2. #2
    Lifetime Member N0DIH's Avatar
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    I have gone pretty agressive with the DFCO on my 94 LT1, it might help a little, but honestly, the gains aren't stellar, maybe up to 0.5 mpg tops, but much of that comes from the driving to make the DFCO be worth it. Like longer coast down and stuff.

    Really, I found best to take what GM has, do nothing more and make the DFCO delay (if you have one) to around 1.2 to 1.5 seconds. more than that is a nucance and you are constantly in and out of DFCO, which is much more annoying than anything.

    You will find that you can't really coast without it slowing more than you probably wanted and you end up back on the gas again to keep it going.

    I found I was happier with the car with stock settings and DFCO timer to 1.3 seconds was the sweet spot on my car. Stock was 2.5 seconds before DFCO would kick in, which I felt was too long.

    Seems GM has the lighter cars with DFCO timer shorter and heavier with it longer, at least of the cars I looked at.


    Quote Originally Posted by harascho View Post
    Did anybody play with the DFCO settings to archive better mpg?
    If yes, what is the best strategy to sqeeze a few more miles out of the gallon?

    Harald
    I owned a Ford once, ONCE.......

  3. #3
    Lifetime Member Boost's Avatar
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    I am pretty sure I asked this somewhere but DFCO is what again? Deer feces combined with orange juice?
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  4. #4
    Lifetime Member GAMEOVER's Avatar
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    Quote Originally Posted by Boost View Post
    I am pretty sure I asked this somewhere but DFCO is what again? Deer feces combined with orange juice?
    WTF??? hahaha
    Deceleration Fuel Cut Off
    D F C O
    DFCO
    2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2

    FLASHSCAN V2 & AUTOCAL

  5. #5
    Lifetime Member Boost's Avatar
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    There it is, thank you Gameover! I just knew it was probably not the deer feces one...
    - Roland
    GM dealer tech since 2005
    '01 Z28 LS1/T56
    t-tops :usa:
    stock 241 heads, stock cam,
    stock muffler, factory wheels

    8.2 @ 86
    (1/8th mile with 255 Toyo Proxes)
    I am learning...

  6. #6
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    Dragging up an old thread, but thanks guys: now I know what DFCO means!! Most of the acronyms I'm good on, this one was killing me!
    New to EFILive, been wrenching for about 20 yrs now. Current project: 1998 Chevy K3500, L29

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