I am having a ignition miss at Higher boost levels ,wich I can't seem to shake off and the only answer I've found is closing the gap to .025 thou and that only gives me 4-5 pounds more of boost.Its running a GM DIS waist spark type ignition the dis is supposed to have almost 40,000 volts but what I am wandering is that when the companion cylinder fires in the exhaust stroke if it is using too much voltage to fire the rich and highly compressed gasses and robs the one on the compression stroke.So what I am asking is does anyone have an idea if msd coils will help (that they make for dis)or if I should scrap this ignition and go back to a distributor and high voltage coil driven by an msd box,OR the C.O.P. setup I was considering.
Thanks for any help Nick

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Nick
86 d150 turbo /6.
64 valiant 4 door

That miss sounds like blowout.Since the gap seemed to help,I bet thats it. How much boost are you running? .025 sounds right for 18+lbs of boost!

If closing the plug gap cures the problem then I would expect more ignition energy to help. Better coils or individual coils could both do this in theory, but may be problematic in practice. With the existing coil drivers you may not be able to get enough more energy into MSD coils to solve the problem. Ionizing the plug gap on the exhausting cylinder is usually easy, but if you have a lot of exhaust pressure you'll need/use more energy in the non firing cylinder leaving less energy for the firing cylinder. Therefore individual coils may be a better choice.

A good article on ignition.

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Joshua

I,m trying to run 25 but 15 has bean the limit with .035 gap

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Nick
86 d150 turbo /6.
64 valiant 4 door

Definitly your ignition system then.I ran 16 lbs of boost in my SRT and I had them gapped at 35.

I would just run a MSD box and coil and eliminate the chevy stuff if you can.What kind of fuel management do you run?