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Thread: Ignition Decisions with Dominator EFI

  1. #41
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    Dec 2009
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    Quote Originally Posted by centrifuge View Post
    I assume this is correct, but correct me if I'm wrong.
    I assume you're using Holley's 556-112 CNP coils? If so, your Ignition Parameters are correctly programmed.

    I did not have an RPM signal.
    This is the problem. One of the signals (crank or cam) isn't transmitting or isn't timed correctly.

    Does the ECU look for the defining cam sync event (IE Digital Falling - trailing edge of the 1x 50/50 tooth) a certain amount of time (or degrees) before it sees the reference angle (in this case, 60° BTDC)?
    Yes, the ECU needs to read the cam sync signal before it syncs RPM with the crank sensor.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, 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.

  2. #42

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    I assume you're using Holley's 556-112 CNP coils? If so, your Ignition Parameters are correctly programmed.
    Yes, those are the coils.

    This is the problem. One of the signals (crank or cam) isn't transmitting or isn't timed correctly.
    Question, once I look at the System Log, I will either see 2 different square wave patterns or not?
    If there are 2 patterns, but still no RPM signal, is there anything that could be an issue besides they are not synced properly?
    Can you tell me what you would be looking for in the System Log, if you do see both signals but no RPM?

  3. #43
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    Location
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    Quote Originally Posted by centrifuge View Post
    Question, once I look at the System Log, I will either see 2 different square wave patterns or not?
    Yes, you'll see a "Crank" pattern and a "Cam" pattern (two separate channels).
    Not "Crank A/D" & "Cam A/D" (Analog to Digital). Ignore these channels, they're currently not important to the end user.

    If there are 2 patterns, but still no RPM signal, is there anything that could be an issue besides they are not synced properly?
    No. If the Crank & Cam patterns are legitimate, recheck their signal timing:
    http://forums.holley.com/showthread....m-Sensor-Setup (Crank & Cam Sensor Setup)

    Can you tell me what you would be looking for in the System Log, if you do see both signals but no RPM?
    http://forums.holley.com/showthread....s-amp-Datalogs (Datalog Information)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, 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.

  4. #44

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    Thanks! One small issue, got it sorted and it fired right up.

  5. #45
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    Dec 2009
    Location
    Connecticut
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    Quote Originally Posted by centrifuge View Post
    Thanks! One small issue, got it sorted and it fired right up.
    I knew you'd find an easy-to-fix problem.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, 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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