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COP for high boost (15psi+)

Old 06-16-2011, 09:17 AM
  #21  
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Originally Posted by TurboTim View Post
What's bad about DIY wire kits?
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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Old 06-16-2011, 04:50 PM
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Originally Posted by Ben View Post
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.
Are they hot enough to melt holes in the tops of my pistons? If so, I'm interested.
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Old 07-30-2011, 04:04 AM
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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.
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Old 01-19-2012, 05:54 PM
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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!
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Old 01-19-2012, 08:18 PM
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Originally Posted by codingparadox View Post
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!
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Old 01-19-2012, 09:16 PM
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I assume you mean 0.020-0.025?
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Old 01-21-2012, 05:21 PM
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Originally Posted by fooger03 View Post
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.
About right, but do include 2 things:
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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Old 01-22-2012, 03:43 PM
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Originally Posted by codingparadox View Post
I assume you mean 0.020-0.025?
That is correct. Your probably not going to see much more than a ..020" to .025 gap on regular NGKs at that boost. I didn't seem to have much luck with Iridiums either. .026 seemed to be about my limit.
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Old 01-22-2012, 03:58 PM
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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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Old 01-22-2012, 04:00 PM
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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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