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Thread: injector duty cycle

  1. #1
    Lifetime Member minytrker's Avatar
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    Default injector duty cycle

    What do I need to do to find injector duty cycle? I know its something eay and I thoiught I read it on here but couldnt find it with the search.

  2. #2
    Joe (Moderator) joecar's Avatar
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    If you have an F or Y car, select the following pids:
    IBPW1
    IBPW2
    INJDC1
    INJDC2

  3. #3
    Lifetime Member minytrker's Avatar
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    Default

    That will give me my duty cycle or will I have to make a map of some sort?

  4. #4
    Member bK's Avatar
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    From EFILive Scan PID under More INFO

    GM.INJPW1 = Injector base pulse width - bank 1

    Units: ms
    Range: 0..999.9 ms

    The injector base pulse width is the number of milliseconds (thousandths of seconds) for which the injectors are commanded open by the PCM.
    CALC.INJDC1 = Injector Duty Cycle Bank 1
    Expression:
    % = {GM.IBPW1}*{SAE.RPM}/1200

    You need to scan INJPW1 and/or INJPW2 and from that info the Duty Cycle is calculated from that info.
    Chassis by Holden
    Engine by Chev
    PCM modified by Flashscan
    Cam by Comp Cams

  5. #5
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by minytrker
    That will give me my duty cycle or will I have to make a map of some sort?
    The INJDC1 and INJDC2 pids can be plotted on a log chart and can be displayed on a guage.

    You don't need to make a map, unless you want to see how the duty cycle trends wrt to (say for example) RPM and DYNAIR.

  6. #6
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    Default INDJC1and2

    Quote Originally Posted by joecar View Post
    The INJDC1 and INJDC2 pids can be plotted on a log chart and can be displayed on a guage.

    You don't need to make a map, unless you want to see how the duty cycle trends wrt to (say for example) RPM and DYNAIR.
    Where in the list of PIDs are these selections?
    01 Z28 - LT headers, CATS!, EGR!, Ported TB, TB bypass,CAI,Elec Cutout
    79 Camaro - 383 SBC, VicJR HiRise with1.5"spacer, 3000 stall, TH350, 2.05/1.60 Valved DHump heads, LTs, Holley 850 DP, Holley Blue.
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  7. #7
    Joe (Moderator) joecar's Avatar
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    On the PIDs tab, un-check Supported, then click on the Caption column heading once or twice, this sorts alphabetically by this column, then scroll down until you see those pids.

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