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do you know that every coil pack is firing strongly.
i would test each coil pack individually you will have to have spares to run the car on then on one of the front coil pack swap ech coil you want to test on the same coil pack position.
to test it:-
plug coil pack in to the loom and use a grounded wire to allow the coil pack to spark to and draw the spark from the end of the coil pack and see how far the spark will jump to the grounded wire. it should jump about 1 inch from the end of the conductor on the inside of the coil pack from the spring contact.
each coil pack should sparks should jump the same distance. you can buy little tool for doing this with an HT cable and an earth clamp and a screw that you screw in and out to adjust the the spark gap jump distance.
but a earthed wire or test lead will do the same job.
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The only thing i was concerned about doing a COP conversion was the coil pack being used are from a sequential spark 4 cylinder engine, and we are using them on a 6 cylinder wasted spark system so the coil will have to charge in half the time than it had to charge in the 4 cylinder engine.
in the 4 cylinder engine each coil will fire once every 2 crank rotations.
in a 6 cylinder wasted spark engine each coil will fire twice every 2 crank rotations.
however the standard coils in an Mitsubishi evo as in a wasted spark config so you would run into the same issues doing a cop conversion in that engine as we would have doing it on our engine, and there does not seem to be any issues reported on doing the cop on the evo.
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From experience the Honda K20 coils is a great upgrade. I made 400whp on stock vr4 coils and wires but with great blowouts even carrying down the spark plug gap to 18 thou. Now with the COP kit i'm well over 500whp @ 22 thou plug gap.
Hope my little experiment helped lol.
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I did check all 13 of coils, I do splice in connector, plug in coil, fit spark plug let it rest on engine and crank engine with all original coils unplugged, all of them spark nicely, there was huge difference in spark between denso coils and mitsu ones, hardly visible on original, bright and fat on denso one, hence when I see it it was obvious to me its worth while to do conversion.
Rev range, the same coils are used on Honda VFR 800 which rev up to 12000 RPM so I think they will be fine on pathetic 6500 RPM in VR4 :-)