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Thread: Retard Function Question

  1. #1

    Default Retard Function Question

    I would like to use one of the retard functions. I was wanting to use it to trigger on release of the transbrake. This function is ground operated. I would like to ask if I could run the ground from the transbrake in car and to the same input as Pin Mapped. Or is their another way to do this? The transbrake is relayed through a Leash relay board. My Transbrake/Launch is on Input #2 +12V. Thank you.

  2. #2
    Join Date
    Nov 2013
    Location
    Chicago IL
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    1,952

    Default

    I'm not quite understanding how you have it wired. I just need some clarity first.

    Your switch is run to the leash board and the leash board triggers the transbrake.
    But do you have that transbrake switch already running into the Holley ECU? Or do you only have it only going to the leash board?

    The signal that goes to the ECU must come from the NON powered side of the relay.
    Meaning it needs to come from the trigger wire, NOT from the wire that provides a power or ground to your transbrake.

    I you have a +12V going to the Leash relay board, but you need a ground going to your Holley.
    (I would assume it would be because you have no more +12V inputs left.)
    Then you can add another relay to the system to trigger a ground to go to the Holley.
    This way you would have a ground with no amperage load on it, going to the Holley and no risk of damaging the Holley.

    Now, if you do still have +12V inputs available on your Holley, you can simply take the signal wire going to your Leash board,
    and split it off to take it into the Holley directly, as the relay is already there to protect against the transbrake amperage draw & flyback voltages that can occur.

    If you already have the transbrake going into your Holley, you can simply specify that the launch retard uses a +12V signal,
    and then you can specify to activate on release, and then drag & drop the input in the Pin Map to the same input as your transbrake.
    You can stack up to 3 of the same type of input all on the same one. (Example, transbrake/2-step/timing retard...all on the same pin in the Pin Map.)
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
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  3. #3

    Default

    Scott, the transbrake switch goes to the Leash board, and then out to the solenoid and to the ECU. I guess I need to move this to the switch side, from your second statement. I was thinking I might have this on the wrong side.

    When I check the box to make the retard active, it puts it in the top box of Pin Map, and this only shows a ground. It does not show a +12V positive option.
    I do thank you for putting up with dumb questions.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
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    23,111

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    Quote Originally Posted by 65rambler View Post
    When I check the box to make the retard active, it puts it in the top box of Pin Map, and this only shows a ground. It does not show a +12V positive option.
    After enabling the Input for Timing Retard #1, 2 or 3 (in Basic I/O - System ICF), enter the Inputs/Outputs screen (still in System ICF), and change the Timing Retard #1, 2 or 3 "Input Type" to Ground.
    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

    Default

    OK, Thanks Scott & Danny.
    I fixed my big mistake and moved the input to ECU, from the out side or the relay, to the trigger side coming from transbrake switch.
    Also, I was able to see what Danny said and make it +12V instead of ground.
    I made it activate on release of transbrake. So it should now start retard when the release of transbrake happens.
    I assume this all happens through the ECU, and requires no wires to be added. Thanks guys.

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
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    23,111

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    Quote Originally Posted by 65rambler View Post
    I assume this all happens through the ECU, and requires no wires to be added.
    In the Pin Map, the additional Inputs you "combine" with the original Timing Retard #1, 2 or 3 (Basic I/O - System ICF), do not require wiring.
    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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