COPs for Dummies... a writeup - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-30-2008, 05:38 PM   #21
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Hi guys, do you think that the cops from a '06 Toyota SIENNA (part number 90080-19025 ) will work in a miata? (+emu)

They looks like the cops you are using from the 4l, but they are from a V6...
Should i buy them (really cheap) and try?
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Old 03-30-2008, 05:57 PM   #22
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Here it is: http://www.yowjung.com/product/DirectCoil-l.pdf
Page 5.

Any reason why they should not work?
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Old 03-30-2008, 10:06 PM   #23
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Theoretically, you should be able to wire up any coil out there.
As long as you have the ability to manipulate the dwell, trigger, etc... you should be able to get any coil to fire.

But the coil has to fit in the valley of the valve cover, it has to fit through the hole, and it has to reach the spark plug. The 1ZZFE Toyota Coil itself is perfect in it's dimensions... it fits perfectly. And somehow the stock Miata ECU is close enough to the Toyota ECU in it's signals that it fires perfectly.

And you can get a set on eBay for cheap.
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Old 07-30-2008, 12:34 PM   #24
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Thanks for the great writeup. I am looking for some clarification though. I have a 1997 that I am switching over to COPs. What is the connector on the CPU side of the harness. I know what connectors I need for my ignitors, I just don't know what the plug is on the other end. Am I correct in thinking that it is part of the ignitor that is already on my stock setup? If so is there a place where I can just buy the connector? I would like to be able to switch back to my plug wires at a moments notice.
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Old 07-30-2008, 12:57 PM   #25
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Allow me to jump in here quickly before Sam wields his fabled Staff of De-Noobification.

I (and I presume, we) have utterly no idea what the hell you're talking about with this CPU-side business. If you're referring to the two three-pin plugs on your engine wiring harness that used to plug into your stock coils, then that's where the connectors are- on the stock coils. I'm not aware that anyone has a good mating connector for them- either splice into the factory harness using vampire taps or hack apart some old coils and liberate them of their connector.

In your '97, the factory coils (two of them) each had an igniter built in. So each of the two three-pin coil connectors has a ground wire (black), a +12 wire (blue) and a trigger wire which is +5 active-high from the ECU (brown and brown / yellow.)

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Old 07-30-2008, 05:41 PM   #26
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Thanks for the help. That answered my question. I am definitely a noob and sorry for the confusing description. I just had a hard time figuring out how to describe it.

I haven't torn apart my ignition yet so I am not sure about this next question.

If there is a ground, a +12 and a trigger going to the 2 stock coils, where am I supposed to wire the tack to? Is there another connection further up the pipeline or is this not even applicable on this model?
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Old 07-30-2008, 06:52 PM   #27
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Quote:
Originally Posted by Joe Perez View Post
Allow me to jump in here quickly before Sam wields his fabled Staff of De-Noobification.
Ahem... I see my services are needed.

Hey NOOB, allow myself to introduce myself. I am Sam (although there are many Sams and many threads, this thread is mine) and since you chose to make every NOOB mistake I can think of and defile a thread I started, here you go.

SEARCH NOOB-******!
A title search for the word COPS reveals 37 threads. The 17th of 37 threads reveals:
COPs for dummies... for the 1.8
https://www.miataturbo.net/forum/showthread.php?t=20008

And stick something in your profile before I get mad and change my avatar to a picture of your mom bent over my hood. And then go to the NOOB forum and make an intro thread to redeem yourself. And welcome. And we need pics or you won't like my new avatar.

Last edited by samnavy; 07-30-2008 at 10:19 PM. Reason: Link fixed... hope it lasts.
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Old 07-30-2008, 08:46 PM   #28
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Thank you Sensei for your great wisdom.

Quote:
Originally Posted by samnavy View Post
Oh and by the way you've got a dead link there pal.
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Old 07-30-2008, 10:07 PM   #29
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Wow Sam. That is terrific.
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Old 07-30-2008, 10:21 PM   #30
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OMG OMG OMG OMG OMG OMG OMG OMG OMG OMG!!!!!!!!!!!!!!!!!!!!!!!!

Corky told me I did something good to my Miata.
That's like Jenna Jamieson saying that you were good in bed.
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Old 07-31-2008, 12:09 AM   #31
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I just wanted to say thanks for the info! I don't post up on here much, but this is just the info I have been looking for. I should be all setup and running soon.

I am doing something just a bit different though. I'm using a plug and socket from an old Honda wiring harness on the harness side of the OE miata coil plug (I have a 95 1.8l). I have two connectors for it, I'm soldering one to the original coils, and the other to the COP wiring. That way I'll have a easily reversible 1.8l setup. I'll post up picks after solder everything so you can see what I'm talking about.

Plus I need to use all these extra wiring harness connectors that I have left over from my Honda builds!

Anyways, thanks!
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Old 11-25-2009, 02:47 AM   #32
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where can i find wiring diagram for the COP conversion that makes sense for my 93 1.6. Im trying to make my AMX07 Miata run as good as it looks.
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Old 11-25-2009, 11:17 AM   #33
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Quote:
Originally Posted by crashdock View Post
where can i find wiring diagram for the COP conversion that makes sense for my 93 1.6.
You're shitting me, right? Hahaha, that's a good one. I mean, it's not like that info isn't linked in the FIRST ******* POST IN THIS THREAD!
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Old 11-25-2009, 11:30 AM   #34
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Looks like my hold down plate . My True Value hardware had silverish tubing in their misc metal tube/etc... section. For those that don't want the Brass or have the bother of painting it.

Great work on the writeup.
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Old 11-25-2009, 12:25 PM   #35
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Quote:
Originally Posted by crashdock View Post
where can i find wiring diagram for the COP conversion that makes sense for my 93 1.6. Im trying to make my AMX07 Miata run as good as it looks.

Search button, use it!
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Old 11-25-2009, 12:35 PM   #36
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Quote:
Originally Posted by crashdock View Post
where can i find wiring diagram for the COP conversion that makes sense for my 93 1.6. Im trying to make my AMX07 Miata run as good as it looks.

hmmm. if this writeup is for dummies to understand, what does that make you?
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Old 11-25-2009, 02:27 PM   #37
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Thanks! Great write-up...

is it going in the wiki or stickies somewhere
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Old 11-30-2009, 03:59 AM   #38
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Quote:
Originally Posted by samnavy View Post
STEP#6: Now that the harness is finished, test it.
Pull the spark plug wires.
Unplug the coil pack.
Unplug the ignitor.
Drop in your COPs.
Connect the harness to the COPs.
Ground the harness.
Plug in the gutted ignitor, or just slip on your wire ends.
Sam, thanks for the great write-up.

After reading some 21 pages of the Lazzer's thread, I came across yours.
And, really, only this step was baffling me, but, now, I think I understand.

The signal sent from harness gets processed by the ignitor, gets sent to the coil pack, which generates stronger current, which is then sent to the spark plugs.

By plugging the COP harness, I will no longer need the coil pack (that's pretty obvious), and, seems I no longer need the ignitor, although leaving it in place won't do any harm, right?

So, as long as I piggyback a connector onto the ignitor plug (just so the COP harness can be removed to revert to stock), all I should do is unbolt the coil pack.

Right?

Thanks!
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Old 02-07-2010, 09:25 PM   #39
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(i hope i don't get flamed for this)

I asked railz to make me a COPs harness. I soldered on the connectors myself and tested the harness with a multimeter for continuity (only positive, not negatie.. IOW i didn't make sure no other pins had continuity when they shouldn't..)

I tried to fire it up and eventually iit ran on 2 or 3 cylinders.. I originally set dwell to 2.5ms for crank and run, but had to go to 5 to get it to fire up.

I trimmed down the COPs' plastic bases so that they would sit further down a into the well and tried again, but this time it wouldn't start at all, though it sputtered a few times.

So quick question #1 -- i see on the other threads that the harness is supposed to have a ground lead to the block.. the harness i got from railz doesn't have that.. should i take it apart and add one? Is it required?

#2 -- is there any way to test all my coils to eliminate them as a problem?

---------- EDIT -----------
Problem solved... the harness was set up where cylinder 1 'branched' off instead of being the trunk and cylinder 2 was the 'trunk', so i accidentally had them switched when i installed it.

Now running on all 4 cylinders!

FWIW here's how i did my hold-down bracket:
1) buy some 1"x1" right-angle aluminum (i bought this for strength, much less flex than flat stock)

2) buy two approx 2" long M5x0.8 bolts / machine screws. (My valve cover was already messed up, there were sheet metal screws holding down the wire guides, no bolt i found was an exact thread match)

3) drill two holes in the flat stock matching the points on the valve cover

4) cut up some left-over silicone hose into little .5" x .75" rectangles and glue them to the top of the cops to provide some cushioning / take up the slack

5) mount the flat stock and enjoy



Thanks,
Tomaj

Last edited by ctxspy; 02-08-2010 at 10:50 PM.
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