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Old 12-24-2011, 05:41 AM   #21
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AFAIK (and I did automotive parts market research for four years) the principle reason for use of COP by the OEMs was to allow for easier OBDII compliance and diagnostics in the event of a coil failure. A faulty coil effects only one cylinder with COP. It had nothing to do with performance compared to the tower style EDIS coil as Tom's testing confirmed.
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Old 12-24-2011, 07:16 AM   #22
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+1

I didn't do it for performance gains I did it to clean everything up and make things look better. The whole reason I'm running the MSD dis-2 with it is because I wanted to be absolutely sure clean looks wouldn't cost me any performance.



Quote:
Originally Posted by 1turbofocus View Post
I will let you guys debate what one works best , I have had both on the dyno and can say we saw no gains from adding the COP over the stock coil , with boost we could NOT run more spark gap over the stock coils

I think Roushturbofocus also had trouble out of his COP but he would have to say if and what

For looks I think it is sexy , for performance it seems to be a waste

Tom
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Old 07-20-2013, 01:53 AM   #23
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Bumping this up from the past....

Anyone else out there running Denso 127900-4800 without any issues?

I have been running my 2001 ZETEC powered Mazda Tribute on a set of GSX-R pencil coils and E3.66 spark plugs for approx 1k miles without issue. I just took it on a very spirited 200 mile drive today and the the coils weren't even hot at the end. Regular 7500 RPM pulls and not a hick up or miss.

Just wondering if anyone else is running them and what they are getting for mileage out of them?
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Old 07-20-2013, 01:03 PM   #24
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Hey guys just want to warn you not to convert to cop, you will burn the coil drivers in the pcm.
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Old 07-20-2013, 01:57 PM   #25
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The PCM/ECU or the EDIS module?

Could you please pass on some technical info along with your warning? What is it exactly that burns out the drivers?

I tested the resistance and the current draw with the coils that I am using and didn't see anything that would cause a circuit/driver to burn up.
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Old 07-20-2013, 02:15 PM   #26
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The pcm drivers will burn up due to excessive draw from the cop setup. You would have to change to a megasquirt setup. There are no advantages to a cop over edis. The edis system
Draw is equivalent to two cop coils. Four would be twice the draw.
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Old 07-20-2013, 03:26 PM   #27
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This is what I used to figure out my current draw.

Stock EDIS 4 coil pack;
I = 12V / 0.7 ohm
I = 17.14 amps to fire a coil

my Denso pencil coils;
I = 12v / 1.8 ohms
I = 6.67 amps to fire a coil
So it would take 13.34 amps to fire the 2 pencil coils. That is still less than the stock single coil draw

So does this look right?

Last edited by GhostTribute; 07-20-2013 at 04:28 PM.
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Old 07-20-2013, 03:50 PM   #28
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5+ years on a COP setup, about 50,000 miles.

I'll call BS on burning up anything.
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Old 07-20-2013, 04:54 PM   #29
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I did a quick google search and only saw one person even make mention of drivers burning up with this setup. They said that if the draw was too large that they could burn up.... However as shown above as long as the coils you are using require less current draw I don't see the issue.

You say that there are no benefits to converting... I find that odd as every manufacturer has now moved to using some sort of COP ignition setup. Sure converting to COP and using the wasted spark system is complete BS. I despise wasted spark setups personally. I will be using my MS3 with smart coils soon enough. I just happened to have these coils sitting around from another build and figured that I would give them a shot.



Cut up an old coil I had sitting around to use the connector and maintain the stock wire harness connector.



Still have to get some wire covers and get rid of the stock coil bracket.... kind of ugly sitting there on it's own.
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Old 07-20-2013, 11:00 PM   #30
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I have been told by engineering that it's a risk to burn the drivers, and pcm prices are high. Also I've replaced many pcms with failed drivers due to bad coils and high resistance power circuits to the coils. The factory setup fires one coil, then when the field collapses, the other coil fires, the system Fires multiple sparks below 2500 rpm, and the rest is waste on compression and exhaust. What is your reasoning for disliking waste spark? Getting rid of it won't free up power
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