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How much hp will the holley 75lbs./Hr injectors support

Discussion in 'EFI Tuning Questions and Engine Management' started by chriscrna, Mar 1, 2009.

  1. chriscrna

    Joined:
    Feb 27, 2005
    Is there a chart for injectors. Also dependable HP withut running them too hard.
     
    chriscrna, Mar 1, 2009
    #1

  2. JohnyHotrod

    Joined:
    Dec 31, 2008
    Injectors size x # injectors divided by bsfc = crank hp. Then multiply this by 80% or 95% whatever number you are happy with for maxiumum duty cycle.

    I use .55 for .bsfc

    Or, Method 2

    Injector size x # injectors divided by 60 x desired AF ratio times x 10 = max hp then again multiply by max duty cycle.

    So, at 11.5 af, and 90% duty, about 1025 method B
    or about 981 method A
     
    JohnyHotrod, Mar 1, 2009
    #2

  3. chriscrna

    Joined:
    Feb 27, 2005
    Thanks for the info.
     
    chriscrna, Mar 1, 2009
    #3

  4. njc.corp

    Joined:
    Feb 11, 2008
    Odd ? but how does fuel pressure play a role ?
     
    njc.corp, Mar 8, 2009
    #4

  5. CW25

    Joined:
    Apr 5, 2003
    Most injectors are flow rated at 43.5 psi. Up the pressure and the flow rating goes up.
     
    CW25, Mar 8, 2009
    #5

  6. njc.corp

    Joined:
    Feb 11, 2008
    cool-but does that effect the duty cycle at all-

    Thanks
     
    njc.corp, Mar 8, 2009
    #6

  7. tt350chevelle

    Joined:
    May 25, 2006
    More pressure = more flow = less duty cycle

    Everything else being equal.

    Brad J.
     
    tt350chevelle, Mar 8, 2009
    #7
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