Tim H Posted June 5, 2015 Share Posted June 5, 2015 please tell me how to hook up the wiring to make my stock 280z tach work with the 6 LS coils Quote Link to comment Share on other sites More sharing options...
mtnickel Posted June 5, 2015 Share Posted June 5, 2015 please tell me how to hook up the wiring to make my stock 280z tach work with the 6 LS coils what ecu? What are the 6 ls coils on? are you talking about using 6 of 8 of the coils on the LS swap? Quote Link to comment Share on other sites More sharing options...
Tim H Posted June 5, 2015 Author Share Posted June 5, 2015 Megasquirt 2 V3.57 L28ET Quote Link to comment Share on other sites More sharing options...
mtnickel Posted June 5, 2015 Share Posted June 5, 2015 (edited) Megasquirt 2 V3.57 L28ET The stock tach requires a "coil negative" signal. That is, its a signal that switches to ground, and then lifts ground. When it lifts ground, the coil discharges and a large voltage spike is sent down the coil negative wire. You can replicate this coil negative wire in a Coil-on-plug setup by, 1) Use 6 diodes on the coil negative lines at each coil all joined together 2) Use the tach output wire on the megasquirt and build a "coil simulator" circuit to replicate the voltage spikes. I've outlined that a little more detailed in the RB forum. (requires a relay coil, transistor, and several resistors.). Edited June 5, 2015 by mtnickel Quote Link to comment Share on other sites More sharing options...
Tim H Posted June 5, 2015 Author Share Posted June 5, 2015 can I just run the diodes off the negative side of each one of my coil packs and then also run a diode coming from my tach wire? thanks for the help Quote Link to comment Share on other sites More sharing options...
mtnickel Posted June 5, 2015 Share Posted June 5, 2015 (edited) can I just run the diodes off the negative side of each one of my coil packs and then also run a diode coming from my tach wire? thanks for the help http://forums.hybridz.org/topic/97071-dash-tach-wire-for-a-1978-280z/?p=913123 You will need 6 however. Make sure you know which of the LS wires is the actual coil wire and the signal wire (low current) used for the built in ignitor logic. Edited June 5, 2015 by mtnickel Quote Link to comment Share on other sites More sharing options...
Tim H Posted June 5, 2015 Author Share Posted June 5, 2015 Will i use the 6 trigger wire or the 6 ground wires? Quote Link to comment Share on other sites More sharing options...
Tim H Posted June 5, 2015 Author Share Posted June 5, 2015 I'm thinking i would use the 5volt trigger wires. Quote Link to comment Share on other sites More sharing options...
Tim H Posted June 5, 2015 Author Share Posted June 5, 2015 If i use the ground wirewhich one should i use there are two grounds per coil pack? Quote Link to comment Share on other sites More sharing options...
mtnickel Posted June 5, 2015 Share Posted June 5, 2015 Google images says the one on the far right. Google "ls2 coil pin output" in google images. I can't hand this whole thing to you on a platter. Quote Link to comment Share on other sites More sharing options...
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