Originally Posted by marks73ta
I'm setting up my MS3 Pro to run coil on plug ignition. I'm seeing that LS coils use an "igniter"??? Can someone tell me what an igniter is, how it works and do I need them with factory LS coils. Or. if I use aftermarket LS type coils, such as MSD coils, do I still need the an igniter. Can I run a 12v source to an LS coil, then the MS3 ignition wire for the specific coil back tot he MS3 and be done with it? I can't seem to get anywhere understanding this. Thank you for any help.
Hey Mark, did you sort this out?
If not, yes with the LS coils you just run 4 wires to the coil.
- Switched/fused 12V
- Engine Ground
- Sensor Ground from MS3
- IGN Trigger from MS3
LS coils have internal ignitors built into the coil so you don't need to worry about running a big transistor to fire the coil - the older MS's ran a big VB921 coil driver where LS coils have this as apart of the package so the ECU just needs to send a 0.5V square wave to make it go bang.
If you take a look at the PDF (https://www.ampefi.com/_downloads/ms...nual_1.4.1.pdf
) on section 4.6.3 that should give you the pinouts on the coil and all you need to do is wire accordingly. I'm running LS coils on my 400 with an MS3X for quite a while now and even broke my alternator belt at the drag strip yesterday so my dwell was 5.5ms due to loss of charge circuit and it still made a reasonable pass on battery.
If you need a hand with it, flick me a PM.