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Thread: EFI Idle Tuning Notes

  1. #21

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    Excellent thread!

  2. #22

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    I'm always amazed with Danny's helpfulness, thanks man!

  3. #23

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    Hi. This will be a silly question, but if the ECU is NOT looking after timing, do I need IDLE SPARK CONTROL enabled? - quoting below notes.

    Idle Spark Control Tuning: The Idle Spark Control basically fine tunes the idle speed by manipulating the timing (quickly increasing & decreasing in accordance to RPM). The idle quality must be well tuned before adjusting these two parameters. If the idle is well tuned (fuel & IAC), the Idle Spark PID control can actually help determine the optimum timing advance at idle (LINK & LINK). It may help to datalog various P & D combinations (name the datalog by the two numbers to decipher them), and look for the straightest RPM line. This is because you can't watch the idle RPM on the Data Monitor, since they change too fast and the tachometer usually isn't an accurate enough indicator of idle stability. I've found values of 20 (P term) & 40 (D term) are a good start with Holley EFI systems.
    P & D Definitions - Excerpt from Holley EFI manual:
    • P Term – The speed at which the ignition timing is varied to maintain target idle.
    • D Term – Eliminates the overshoot.

  4. #24
    Join Date
    Nov 2013
    Location
    Chicago IL
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    1,958

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    If the ECU is not controlling timing, then it does not matter if it's enabled or not.
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

  5. #25
    Join Date
    Dec 2009
    Location
    Connecticut
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    Since this isn't an ECU timing controlled application, simply ignore all timing related EFI parameters.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  6. #26

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    Is there documentation somewhere that outlines the differences in the selections available in the Advanced Idle Control drop down on the Idle ICF? Thanks. Holley's description isn't real descriptive:
    Parameters - IAC Control - Advanced Idle Control
    Description: This drop down is used to select the type of application that is being used. This selection drives the background parameters that control the IAC motor. These parameters have been fine tuned for each of these applications, eliminating the need for the user to perform further modifications. If a different type of IAC motor is used (and none of the current selections work for this motor), or none of the selections provide appropriate IAC control and stability, the “CUSTOM” selection can be chosen which open up several advanced tuning parameters.

  7. #27
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
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    EFI Software Help Information/Instructions:
    ‒ On the top Toolbar, click "Help" & "Contents". This opens all Help topics.
    ‒ When navigating the software, click "Help ?", drag it to any parameter and click again.
    ..This automatically opens the definitions for that specific parameter.
    ‒ Tuning information can be read by clicking the F1 key, when you're viewing any screen.
    http://documents.holley.com/techlibrary_199r10544.pdf (Holley EFI Help/Instructions Overview)

    Click the "F1" key for some of the PID & Blanking values. If that doesn't help you, contact Holley Tech Service (LINK).
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  8. #28

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    Thanks, that got a table with most of the values, but it didn't include the Slow, Medium & Fast.

    Click image for larger version. 

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