COP for high boost (15psi+)
It's hard to get the crimps perfect, especially compared to a company that has the proper applicators and dies to do it by machine. You can usually get away with it when using normal coils. IGN-1A are significantly hotter than most coils out there, including GM LSx.
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Are they hot enough to melt holes in the tops of my pistons? If so, I'm interested.
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Well the verdict is in on mine. .030 gap at 20 psi is a no go at 11.5 AFRs with a 2.5ms dwell on the COPs. .028 had intermittent blowout. I did manage to sneak up to a .026 gap and it seems to be ok.
I have a set of the Iridiums laying around I'm going to throw in like Jared suggested. More experimentation to follow, I suppose. I have to check my dwell battery correction also.
I have a set of the Iridiums laying around I'm going to throw in like Jared suggested. More experimentation to follow, I suppose. I have to check my dwell battery correction also.
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I'd PM this to lordrigamus, but I'm only at 6 posts, so I'm not allowed to, apparently. :P
I just ran across this thread a few weeks ago. I'm building a supercharged 99 motor, which will be running somewhere between 16-20psi of boost, on the toyota COPs. I picked up a set of the NGK R5671A-7 plugs, and was wondering where you ended up in terms of spark plugs/gap? Thanks!
I just ran across this thread a few weeks ago. I'm building a supercharged 99 motor, which will be running somewhere between 16-20psi of boost, on the toyota COPs. I picked up a set of the NGK R5671A-7 plugs, and was wondering where you ended up in terms of spark plugs/gap? Thanks!
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i'd pm this to lordrigamus, but i'm only at 6 posts, so i'm not allowed to, apparently. 
i just ran across this thread a few weeks ago. I'm building a supercharged 99 motor, which will be running somewhere between 16-20psi of boost, on the toyota cops. I picked up a set of the ngk r5671a-7 plugs, and was wondering where you ended up in terms of spark plugs/gap? Thanks!
i just ran across this thread a few weeks ago. I'm building a supercharged 99 motor, which will be running somewhere between 16-20psi of boost, on the toyota cops. I picked up a set of the ngk r5671a-7 plugs, and was wondering where you ended up in terms of spark plugs/gap? Thanks!
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Junior Member
Joined: Oct 2009
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only if they're misfiring due to not enough time to produce full dwell at high RPM - unless my math is off *which it very well could be* there is approximately 7.5 milliseconds per rotation at 8k rpm. This means your coil is firing once every 7.5 milliseconds in batch fire, or once every 15 milliseconds in sequential. The Toyota COPS run a dwell of around 2.5 milliseconds, which I think means that they charge for 2.5 milliseconds before firing - this would mean that in batch fire, you should still be able to fire the coils three times as often as you would at 8k rpm and still get a full spark
My basic understanding of how this all works might be wrong though.
My basic understanding of how this all works might be wrong though.
Reserve some time for spark duration (~1ms).
Also, running these COP's that way will superheat them.
So... There is a good point running them sequential. They will run cooler.
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I know that Ben has run .040" gaps at 17psi in the past. I've run .035" gaps at 21psi on gas before as well. I have a hard time believing spark blowout at .025" gaps on COPs at anything less than 25+psi.
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I'm a little new to playing with non-crazy ignition systems (OEM Toyota Alltrac coils could send a spark through 5 inches of lead, as far as I could tell, which is the only other car I've played with custom boost on). How could you tell if you're getting blowout? I assume blowout is different than a complete misfire? High-boost misfires are obvious, but I'm not sure what a "blowout" technically is.
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