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Thread: Engine stops at 6300 - acts like an RPM Rev Limiter.

  1. Default Engine stops at 6300 - acts like an RPM Rev Limiter.

    I have a System Log and a datalog of the event. Is there anyone who can look through what I have, and see if they have an idea of why this is happening? This was the first dyno session with this setup, trying to tune it. Setup is Dominator, MSD Digital 7, front drive DIS, Ford 4.6L. Thanks.

  2. #2
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    Datalog & Global Files must be hosted on a document hosting website. I use Dropbox.com.
    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.


  3. #4
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    There are numerous RPM Errors at 6300+ RPM, that caused the ECU to resync each time. OEM Ford Modular crank & cam sensors?
    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. Default

    Hall-Effect crank sensors with MSD magnet wheel. Ford OEM cam sensor.

  5. #6
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    Have you tried running the engine in non-sequential mode (bad cam sensor)?
    Change the Custom Ignition Parameters to Cam Sensor - "Not Used".
    Enter the proper Firing Order when testing it in non-sequential mode (LINK).
    Don't forget to click "Save" (top Toolbar), and cycle the ignition switch.
    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.

  6. Default

    Did not get a chance to yet. But I did look at the System Log, and the cam signal looked consistent, so I didn't think that was the problem. But I will be trying it. In the System Log, the RPM signal looks like it spikes in height at the beginning of the problem area. Not RPM, but crank position. When running smooth, the crank position stops at 6964 RPM. During the event, the position runs up to 7924 and then an RPM Error.

  7. #8
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    Sounds like you're getting crank trigger wheel flex or wobble. You may need to adjust your crank trigger sensor to be closer, and more centered with the magnets. How is the MSD wheel attached to the crank pulley? Can you take some pictures of the wheel & sensor mounts? What's the crank trigger gap, and what did you use to measure that gap?
    Last edited by S2H; 06-21-2016 at 07:56 AM.
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

  8. Default

    Images added to Dropbox. Gap is .040" measured with a feeler gauge.

  9. #10
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    Quote Originally Posted by Shawn-NMRA Pure Street View Post
    But I did look at the System Log, and the cam signal looked consistent, so I didn't think that was the problem. In the System Log, the RPM signal looks like it spikes in height at the beginning of the problem area.
    Yes, I suspect a problem with the crank sensor/trigger wheel/alignment/gap, etc.
    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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