Changing over to spark control. Using EDIS (wasted spark) since it is the easiest way and also because my MS2 ECU does not support sequential spark control. The MS3 does or I could add a daughter board to the existing ECU but I doubt I'd see enough of a gain to justify it.
The IGN-4 unit from DIYAUTOTUNE.
Looking for a place for the coil mount. Removing the old plug wire retainers left this area clear. Hmm, I wonder?
Huzzah! Perfect fit! That's just waaay too easy!
The only drawback to this location is the fact the connector for the coil wiring is on top. Ah well, a bit of butyl rubber sealant will make it water resistant. Can't reverse the mount because it is a 3 bolt mount. 2 holes on top and one centrally on the bottom. A couple of nylon washers on the top, a strip of nylon along the bottom and a dab of threadlocker blue completes the mounting.
Had to add a coil driver to the Megasquirt for the additional coil. Used a BIP373 coil driver ($8 from DIYAUTOTUNE), did a little bit of soldering and it's ready for the wiring.
The orange wires are for the new coil. The yellow wires are from a previous mod to the unit.
This is for a 4 cylinder mod. The pictured driver will be firing cylinders 2 and 3 and the existing mounted driver (opposite side of the board, not shown) will fire #1 and 4.
Firing order on the M115 is 1-3-4-2. So, coil A will fire 1 & 4 and coil B fires 2 & 3.
If this were for a 6 cylinder there would be another driver installed and for a V-8 there would be a total of 4 coil drivers.