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Basically fire all 4 coils at once, just off the igt output from the ecu.
I'm sure there are a number of reasons you don't see this in vehicles from the factory.....but in my tests, I couldn't find any problem with it.
One other thought, spark duration with these coils seems to be shorter than with the 20v coil (one reason the spark and injection don't overlap). With the shorter duration, the coils won't be working as hard.
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