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Thread: How to determine if cam sync is set correctly for sequential injection?

  1. #1

    Post How to determine if cam sync is set correctly for sequential injection?

    Hi Guys,
    I have set up my ignition reference angle and confirmed by machining a hole in my dizzy cap that my rotor phasing is correct and that
    my actual ignition timing is the same as what the EFI software screen shows. All this was performed with a carburetor still on the engine.

    In regards to confirming if my injector phasing is correct, what is the best method to do this ?
    I'm not just interested in confirming that I have the correct cylinder phasing.

    I want to actually confirm that the injector is stopping to inject fuel at the time when I say it should via the software.
    Example - bottom dead center on induction stroke.

    I still have the carburetor and intake fitted and would like to confirm this is all set correctly before switching over to the EFI intake & injectors.
    A friend told me to check the phasing with a timing light attached to an injector plug, but that did not work for me.

    Any suggestions?
    Thanks in advance.
    Last edited by stwsyb; 12-27-2012 at 07:04 PM. Reason: spelling

  2. #2
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    Quote Originally Posted by stwsyb View Post
    I want to actually confirm that the injector is stopping to inject fuel at the time when I say it should via the software. Example bottom dead center on induction stroke.
    Quote Originally Posted by Holley EFI Software (Engine Parameters)
    Fuel Injector Information - End Angle
    This is the crankshaft angle in degrees when the injectors will finish their injection event. A value of “0.0” degrees will end the injection event at BDC (bottom dead center) before the compression stroke. A negative value moves the event before BDC and a positive value moves the event after BDC.
    Setting this to zero results in the injector firing ending at 0 degrees BDC on the compression stroke. There could be some improvements in cylinder to cylinder fuel distribution by tuning this parameter. If modifying, it is best to move this value in a negative direction to start.
    http://www.motec.com.au/forum/viewto...p?p=3583#p3583 (Good technical description from Motec.)
    http://forums.holley.com/showthread....m-Sensor-Setup (Magnetic & Hall-Effect Crank/Cam Sensor Setup)
    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. #3

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    Thanks Danny.

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