Coil/ignitor wiring for Microtech conversion
Posted: Tue May 06, 2014 11:59 am
Howdy lads. It's been too long between drinks. My Piazza's Microtech conversion is coming along real well, but the last few wires to sort out are the ignition module/coil wires. I've got a pretty good understanding of how the Microtech works, but I'm still hazy on the Piazza's ignition module wires.
My goals:
1. To keep the tachometer functional.
2. To modify as little of the Piazza loom and engine bay as possible, preferably in a reversible fashion.
3. If possible, to keep the Piazza's original knock protection. I'm not sure if this cuts spark by grounding the coil, or what...
The Microtech is an MT8 V2, which I'm told is identical for wiring purposes to an LT8. It's fuel and ignition, and the CAS input is sourced from the two reluctor wires on the Piazza dizzy. Therefore, these two wires will no longer be going to the ignition module. The spark output of the Microtech is a single wire intended to operate via an ignition module (which I have, along with a matching coil), and can also be used for a tachometer signal. It's basically a low-current version of the coil -ve wire, I believe.
Now, the Piazza. Mine's a 4ZC1-T Australian-delivered turbo. The ignition module is a Denso (Nippondenso) unit with part numbers 8944309331 and 101311-5050 12V. It has 6 wires on it I believe:
Red - usually goes to distributor reluctors - left unplugged as these go to the Microtech instead.
Yellow - as above
Brown - tee'd, this goes to coil +ve and also becomes Black/Yellow into the car's wiring loom, this is ignition +12V from the ign barrel
Green - Unconfirmed, shares a plug with Blue then changes colour
Blue - Unconfirmed, shares a plug with Green then changes colour
Black - tee'd, this to coil -ve and also to the tachometer (becomes Black/Red). This is the igniter's high current switching output for the coil. I believe it also piggybacks to Green with Red rings on the loom, which may supply coil -ve signal to ECGI and TCS (unconfirmed)
Questions:
Does anyone know which wire is the tachometer, and which (if any) is the knock protection, and how it works?
Also, what's a decent source of "Ignition +12V" around there? I'm guessing the wire on the positive side of the coil. I just need it to tell the ECU when to switch on.
Lastly, can the Piazza module take an input from the simple open/closed circuit signal that the Microtech would send? I'm guessing not; I'm guessing it's designed to convert the Reluctor wave signal into a spark.
My goals:
1. To keep the tachometer functional.
2. To modify as little of the Piazza loom and engine bay as possible, preferably in a reversible fashion.
3. If possible, to keep the Piazza's original knock protection. I'm not sure if this cuts spark by grounding the coil, or what...
The Microtech is an MT8 V2, which I'm told is identical for wiring purposes to an LT8. It's fuel and ignition, and the CAS input is sourced from the two reluctor wires on the Piazza dizzy. Therefore, these two wires will no longer be going to the ignition module. The spark output of the Microtech is a single wire intended to operate via an ignition module (which I have, along with a matching coil), and can also be used for a tachometer signal. It's basically a low-current version of the coil -ve wire, I believe.
Now, the Piazza. Mine's a 4ZC1-T Australian-delivered turbo. The ignition module is a Denso (Nippondenso) unit with part numbers 8944309331 and 101311-5050 12V. It has 6 wires on it I believe:
Red - usually goes to distributor reluctors - left unplugged as these go to the Microtech instead.
Yellow - as above
Brown - tee'd, this goes to coil +ve and also becomes Black/Yellow into the car's wiring loom, this is ignition +12V from the ign barrel
Green - Unconfirmed, shares a plug with Blue then changes colour
Blue - Unconfirmed, shares a plug with Green then changes colour
Black - tee'd, this to coil -ve and also to the tachometer (becomes Black/Red). This is the igniter's high current switching output for the coil. I believe it also piggybacks to Green with Red rings on the loom, which may supply coil -ve signal to ECGI and TCS (unconfirmed)
Questions:
Does anyone know which wire is the tachometer, and which (if any) is the knock protection, and how it works?
Also, what's a decent source of "Ignition +12V" around there? I'm guessing the wire on the positive side of the coil. I just need it to tell the ECU when to switch on.
Lastly, can the Piazza module take an input from the simple open/closed circuit signal that the Microtech would send? I'm guessing not; I'm guessing it's designed to convert the Reluctor wave signal into a spark.