Re: Coil-on-Plug Coils
It depends on what you want to do.
For a v8:
Crank trigger/sensor with 4 teeth is enough to run a distributor ignition, and bank/batch injection (where all injectors are fired together, or in two groups alternating).
Crank trigger/sensor with higher toothcount and a "missing" tooth (Ford EDIS wheel is where it's at IMO) is enough to run wasted spark ignition, or coil-per-plug in wasted spark mode (fires coil every revolution, not every other) - injection wll still be bank or batch.
Crank trigger/sensor with missing tooth PLUS cam sensor (tells the computer when the engine is on compression stroke versys exhaust) is enough to run SEQUENTIAL injection, as well as sequential ignition. (This is how LS engines are run from the factory).
A 4 cylinder is a similar deal, but I'd recommend just getting it running with fuel control first, then add ignition using the stock distributor and an MSD6a, then finally upgrading to coilpacks and crank trigger. If you try doing all of this at once for your first EFI install, you're guaranteed enough headaches to want to quit it altogether IMO.
Randal's approach was perfect, and he had almost no problems except a goofy component on his first MS board. But if you get a bad board from DIYautotune.com, which is uncommon, they're awesome about replacing it for you.
It depends on what you want to do.
For a v8:
Crank trigger/sensor with 4 teeth is enough to run a distributor ignition, and bank/batch injection (where all injectors are fired together, or in two groups alternating).
Crank trigger/sensor with higher toothcount and a "missing" tooth (Ford EDIS wheel is where it's at IMO) is enough to run wasted spark ignition, or coil-per-plug in wasted spark mode (fires coil every revolution, not every other) - injection wll still be bank or batch.
Crank trigger/sensor with missing tooth PLUS cam sensor (tells the computer when the engine is on compression stroke versys exhaust) is enough to run SEQUENTIAL injection, as well as sequential ignition. (This is how LS engines are run from the factory).
A 4 cylinder is a similar deal, but I'd recommend just getting it running with fuel control first, then add ignition using the stock distributor and an MSD6a, then finally upgrading to coilpacks and crank trigger. If you try doing all of this at once for your first EFI install, you're guaranteed enough headaches to want to quit it altogether IMO.
Randal's approach was perfect, and he had almost no problems except a goofy component on his first MS board. But if you get a bad board from DIYautotune.com, which is uncommon, they're awesome about replacing it for you.
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