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Thread: V2 to V5 110 Ignition Issue

  1. #1

    Default V2 to V5 110 Ignition Issue

    I've recently started messing around again with my BBC '67 Camaro. I installed a HP back when they first came out. Update to V5 went well. It fired right up. I did a static timing check and now I'm 10° lower than commanded. I have messed with Inductive Delay from 60-240 usec and it stays solid at 10° less. The only change I did was go from Points Out with Adjustable Dwell to points out fixed duty MSD (I have a 6AL). Do I adjust the Ignition Reference Angle now (60° currently)? The distributor is locked down solid, so I know it hasn't moved. Timing has been rock solid for years. I feel a little uneasy that I need to adjust it.

  2. #2
    Join Date
    Dec 2009
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    If you're using the Individual Cylinder Timing Correction in System Parameters, this was changed in later version(s) of V4. Read "Important Note!!!" on page 5: https://documents.holley.com/techlib...r10864rev1.pdf (Holley EFI V4 Software Overview)

    Ensure there aren't any active 'timing modifiers' at this point (e.g. Timing vs Coolant Temperature, Timing vs Manifold Air Temperature, Knock Retard, etc.). Also, ensure you don't have any erroneously programmed "Warning Enabled Timing Offset" parameters in the "Sensor Scaling/Warnings" (System ICF) or in the custom Inputs (Inputs/Outputs ICF). If you're not sure, use the EFI software "Enable Static Timing Set" (in the "Sync With ECU" icon, drop down menu - top Toolbar).

    Quote Originally Posted by Danny Cabral
    I don't recommend using the Enable Static Timing Set to check the Cranking Timing (fuel injector harness temporarily disconnected). Sometimes (although a rare occurrence) enabling the Static Timing Set indicates the timing isn't synchronized at idle; even though the idle timing has just been physically synchronized (by turning the distributor or adjusting the crank sensor). This is usually due to the trigger wheel being off a little bit, and/or an inaccurate software setting in Ignition Parameters. Either way, it's an installation error or a user software setting error. Example: I once helped a Holley DIS user who had the 60-2 trigger wheel off a tooth or two. This caused the "TDC Tooth Number" (in the EFI software) to be inaccurate, which resulted in a "Enable Static Timing Set" discrepancy (at idle) when used. Once corrected, the "Enable Static Timing Set" matched the idle timing when enabled & disabled.

    This procedure is foolproof and actually confirms itself:
    1st, temporarily disable the Idle Spark control (Idle ICF), and synchronize the timing at idle. (Ensure all timing modifiers are inactive.)
    2nd, activate the Enable Static Timing Set, and confirm the idle timing is still synchronized. (I use a static value of 25° or 30°.)
    3rd, momentarily rev the engine to check timing synchronization at higher RPM, using the Inductive Delay. (Adjust as necessary.)
    4th, disable the Enable Static Timing Set and enable the Idle Spark control.
    Again, this is the same procedure outlined in this timing synchronization tech page (LINK).
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

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