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Thread: T56 Dominator Setup - Speedometer/Reverse Lockout Wiring Questions

  1. #1
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    Default T56 Dominator Setup - Speedometer/Reverse Lockout Wiring Questions

    I did some searching on here and found a couple posts pertaining to speedometer setup, and more importantly reverse lockout. My setup is a Dominator EFI with a T56 Magnum transmission. I have a 2-wire inductive VSS sensor, an Auto Meter electric speedometer, and the transmission has a reverse lockout solenoid. I'm switching from a stock '06 GTO LS2 PCM and everything worked without issue. I have a few questions.

    Let's start with the reverse lockout. The way this works according to my '06 GTO wiring harness diagram, is that 12 volts is applied to one wire with key in run/start, and ground is applied to via the PCM to the other wire when the vehicle VSS shows less than 5 MPH. One post I read stated that a relay would need to be used (LINK). "A relay must be used because all the ECU's Outputs are rated at a maximum of 2 amps." My question on this is, if I supply my own key-on +12V power source, and let the Dominator provide the ground output to the solenoid will I still need a relay? I just don't want to damage my new $$$ Dominator.

    Next question. To setup a VSS output to the Dominator, I had planned on adding a custom I/O named VSS Signal, select IPU Speed/Freq as the Type, enable it, assign it a pin, and configure the pulses to get a desired MPH output. I also read some people simply ground the other side of the sensor to a known good ground. I was going to take it one step further and add another I/O call it VSS Ground, assign it a Type as Ground, assign it a pin, and Enable it. Good idea or no?

    My next question is for the reverse lockout. To add this correctly, would I go to I/O then Outputs, Name my Output Reverse Lockout, assign it a Type as Ground, assign it a pin, Enable it, then Configure it? Then under Configure, Sensor Input Triggers number 1, "This Output will activate when VSS Signal is below 5 MPH".

    If everything is good so far, my last concern is speedometer output. It appears that to add speedometer output function I need to add the Transmission ICF, click the "Speedometer Output Enable" box, select the Pulse Per Mile, then this gives me the option to assign a Speedo Output to an output pin. Does the Speedometer Output pin generate the same sine wave pulse as my VSS Output?

    Thanks for the help, I think I'm going to enjoy the almost limitless functions of this unit.

  2. #2
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    Quote Originally Posted by TheBuMan78 View Post
    "A relay must be used because all the ECU's Outputs are rated at a maximum of 2 amps." My question on this is, if I supply my own key-on +12V power source, and let the Dominator provide the ground output to the solenoid will I still need a relay? I just don't want to damage my new $$$ Dominator.
    Yes, a relay is still required for a ground output because of the circuit amperage draw.

    To setup a VSS output to the Dominator, I had planned on adding a custom I/O named VSS Signal, select IPU Speed/Freq as the Type, enable it, assign it a pin, and configure the pulses to get a desired MPH output.
    http://forums.holley.com/showthread....ith-Holley-EFI (VSS Input Information)

    I also read some people simply ground the other side of the sensor to a known good ground. I was going to take it one step further and add another I/O call it VSS Ground, assign it a Type as Ground, assign it a pin, and Enable it. Good idea or no?
    It's not necessary to utilize a ground output like that, but it's fine to do it that way.

    My next question is for the reverse lockout. To add this correctly, would I go to I/O then Outputs, Name my Output Reverse Lockout, assign it a Type as Ground, assign it a pin, Enable it, then Configure it? Then under Configure, Sensor Input Triggers number 1, "This Output will activate when VSS Signal is below 5 MPH".
    Seems correct to me.
    http://forums.holley.com/showthread....8389#post58389 (How To Create A Custom Input/Output)

    It appears that to add speedometer output function I need to add the Transmission ICF, click the "Speedometer Output Enable" box, select the Pulse Per Mile, then this gives me the option to assign a Speedo Output to an output pin. Does the Speedometer Output pin generate the same sine wave pulse as my VSS Output?
    http://forums.holley.com/showthread....0291#post30291 (Speedometer Output 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.

  3. #3
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    Thank you for the help, much appreciated!

  4. #4
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    You're welcome.
    FYI for others reading this: Since he has the Dominator ECU and a 2-wire VR magnetic (inductive) VSS, he doesn't need to convert the VSS to a Hall-Effect type (as outlined in the LINK from post #1).
    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.

  5. #5

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    I have researched a bit and I understand how to setup the input for the VSS on the T56, etc., but how do I calculate the PPROT correctly? This is on a T56 Magnum for my application. I have a 3.50 gear and a 27.5" OD tire (345/35/18 MT DR).
    1969 Camaro - LSX427 TT

  6. #6
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    Quote Originally Posted by will69camaro View Post
    ...but how do I calculate the PPROT correctly?
    Start with the same number of "Pulses to Average" as "Pulses" (PPROT - pulses per rotation).

    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/techlibr...10555rev17.pdf (Holley EFI Wiring Manual)
    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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