XDI Ignition Coils

[bullethole]

Does anyone out there know how the XDI ignition coils work (or for that matter, if those coils are a common GM (or other MFG) part). As I move from the XDI to the MS3 I need to determine if these can be triggered by a logic signal or if they need some other circuitry. When I look at various pieces of information, it seems to me that the 4 wires to the coil pack are
red/white 12V
Each other controls the firing of the specific coil. But I'm a bit concerned about how to control the charging time of the coil (don't want to fry something expensive).

What are other MS3 users using on their 911's?

[Brad394]

GM style DIS coils are very common - price right too. You can source from just about any aftermarket speed shop, or online parts warehouse ( for stock )

BG

[TimT]

You can get replacement coils for the XDI system at almost any FLAPs, a GM two post coil..

Theses are "dumb" coils and need an igniter to fire... I doubt you can drive them directly from Megasquirt

[bullethole]

Thanks.. yes I need an igniter, and have one on order (got the answer on the MS forum). Its good to know that they are nothing special, that way when I go to dual plug (way down the road), I can get the second set of coils cheaper (it won't have their fancy mounting plate, but by then I'll have a milling machine and can make my own.

[KTL]

I was told by the guys I got my car from, which has a single plug Electromotive HPV gold board (soon to be twin plug), that the coil packs are the GM 3800 V6 coil. I have a box for one at home that I can get a part number off of if you want it.

[bullethole]

Thanks.. but right now twin plug is far in my future so i'd probably loose the part number before I get around to doing it.