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Originally Posted by scooter
its more new vs old thing, the coils add nothing much if any at all there have been a number of tests that showed without a doubt that "H.O/performance" coils showed zero gains.
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Disclosure: I am not affiliated in any way with the company making or selling the parts I use, test or describe.
What we do know about flyback transformers, or LOPT, is they do not "get old and wear out" without some kind of quantifiable failure. Mechanical failure in them like a break or short in one of the windings do cause them to fail. In an OBDII car (at least according to the BMW FSM) will cause a MIL/CEL. I had neither case. The original coils also measured within factory specs (primary side resistance.) We also know that potential (voltage) makes the spark happen. But, it's current (amps) that light the fuel. Too much of either and NEITHER will happen. Since I did not change primary input, the only way to effect secondary output is to change the coils, themselves.
My experience over 20+ years of street and track - parts and service has included using Jacob's Electronics systems, Accel and MSD systems. The results all varied as much as the engines they were put on. The ONLY time I measure a zero gain was when an electronic ignition module happened to fail at the time we were testing. The change I described was carefully tested, measured and repeated.
Anyone interested in this subject, I refer you to the book by Dr. Christopher Jacobs,
Performance Ignition Systems published by HP books #HP1306.
About 19 years ago, I had one of his first edition books on the same subject. It clearly takes electrical engineering theory and explains it in practical terms, as used in the real world.