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13B IGN-1A Smart Coils Sub Harness Diagram/Feedback

Practical Motorsport Wiring - Club Level

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Discussion and questions related to the course Practical Motorsport Wiring - Club Level

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Hello All,

I'm moving along in the harness build for my FD RX-7 that will be running a Haltech Elite 1500 ECU. I am building the ignition as a separate sub harness that will connect to main harness via 8 way DTM and separate 2 way DTP for power supply.

I will like to ask for you feedback on how I currently have it setup. I am particularly interested in the wire gauge I've selected for the Rotor Hsg grounds and the sensor grounds.

For sensor ground (Pin B on coils) to ECU I've used 20AWG coming from each coil joined into a single 18AWG that will go to ECU sensor ground pin. Is the 18AWG enough for the 4 coils? I have not found any information about current thru the sensor ground on the coils.

Similarly for the engine grounds (Pin C on coils) I have selected 20AWG coming from each coil. Front Rotor coils (L1 and T1) will be joined to a single 18AWG and grounded to front rotor (Rotor 1). Rear Rotor coils (L2 and T2) will be joined to a single 18AWG and grounded to rear rotor (Rotor 2). Again is the 18AWG enough for 2 coils together?

Below is my hand sketched diagram and my connector chart. Would greatly appreciate any feedback. Thank you

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  • 1993-FD3S-Ignition-Sub-Harness-Connection-Doc-M.Garcia-SpeedNess.pdf
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  • M.Garcia.IgnitionSubHarness.Rev1.jpg
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Thats essentially how I've rigged them on countless rotaries, but to be more specific:

Pin B/sensor ground is a reference to ground for misfire detection and the like, 20-> 18 AWG is more than adequate as current doesn't flow through this ground, this is my MO for anything from 2 to 4 rotors.

Pin C/secondary winding ground, again 20-> 18 is adequate, though keep it as short as possible while also grounding at (presumably) the knock sensor bungs.

Great news! Thanks for the feedback David, it is nice to have some confirmation from someone who has already been down this road.

No worries, good luck on your build.