COP for high boost (15psi+)
 

Searched and searched but nothing concrete. Ive just blown my fourth AEM TwinFire box so enough is enough. Going to ditch the 300M coils and run Toyota COP's with integral ignitors. But what i havent found is anyone running toyota COP's in 300bhp+ cars. Just want clarification that they are out there and work OK. I can vary the dwell and everything with my Motec so should have no issue running them.
Thanks in advance

it's what many are using. There are other offerings from DIYautotune and Flyin Miata.

Depending on your ECU you might have to go sequential. COPs are an easy setup though, honestly. Running 14psi and .04 gap with NGK resistorless.

I know I was making well over 350rwhp at one point and I was still on the stock MSM coils. The difference was the iridium NGK plugs I was using. I had blow out at 15 psi with the standard BKRE7F's gaped all the way down to 20. After switching to the iridiums, I was able to run 30 psi with a 30 gap with zero issue. Try those first before anything else. Its cheaper for now if they work for you

Ok, good feedback thanks. Im already running the NGK irridiums due to a misfire at 290bhp that wouldn't go away. Switching to irridiums gave me instant 6bhp, then we got another 5 bhp from fine tuning. Now im fitting a smaller turbo but running more boost, and i want a more reliable solution. Every time the AEM box goes down the car is dead. At least if i run seperate coils with seperate ignitors and i lose one, i stand a fighting chance of limping it home on three cylinders !

Ah yeah that sounds like horseshit to deal with. COPS man. Theyll work.

I'm getting blow out occasionally under high load (on the track) on BRK7E's.

Do you know the model number you were running leatherface??

This is interesting to me as well....I'm running toyota cops with AEM (still batch fired)
Would running sequential prevent spark blow out.

I think its blowing out now at about 16psi...

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.

Thanks... I'm using the dwell settings Savington posted up a while back..I'll look into them..

Ill check my binder at home later tonight and ill let you know Graham

I'm running COPs at 20 psi. with a .022 gap at an AFR of 11.5. No blowout. I'm still retuning after my rebuild but I think I should be able to run slightly more gap without pulling fuel. Just haven tried yet because I'm doing my coolant reroute at the moment. Also running BRK7Es.

Just some food for thought.

Good to know...when I pull fuel the "blow out" seems to go away.
I'll go back and check my dwell settings...this doesn't make sense.

Yeah, mine too. After my last experience with detonation, I fattened it up just for safety's sake. A little too lean with too much timing didn't end well.

When I was running 14psi, I had selected the wrong O2 selected accidentally in Tuner Studios and was actually running about a 10.5:1 AFR . I had blowout on a .025 gap with that much fuel also. So it is all relative. I have yet to try more than .022 at 20 psi with an 11.5:1 AFR. Maybe tomorrow if my pipe for the reroute shows up.

I'm gapped at .022 right now and the car hesitation/blow out goes away if I lean the fuel to almost 13.5-14.0 (thats the reading on the gauge itself & ECU)

I have two sets of 01+ semi COPs for sale.

http://www.diyautotune.com/catalog/i...oil-p-394.html

^^As used on the ~17 psi DIYAutoTune.com Miata, 1000 hp 40 psi 4 cylinder Huber Mustang, and lots of other high boost, high power cars (alcohol dragsters and the like). We replaced a brand new Accel coil on a distributor ignition Porsche with an IGN-1A a couple weeks ago. It drew about 50% more current and the car picked up 15 whp.

We recommend custom, factory made plug wires with these coils. Magnecore will set you up for around $80. We do not recommend self made plug wires from kits.

What's bad about DIY wire kits?

I vote LS1/LS2 coils. I'm running them with success at 14PSI. Not a single misfire ever, idle is ridiculously smooth.

I made my own wires, and from my experiences with Magnacore/MSD wires... my crimps are better than OTS kits I've had for other cars in the past.

Attachment 188215

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.

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'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!

.2-.25

I assume you mean 0.020-0.025?

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.

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.

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.

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.