y8s

iTrader: (8)

evan ordered some infiniti COPs (6) and I told him to send you one. have you heard from him yet?

ha!

now i want a donut.

evank

iTrader: (2)

He has. We're emailing about this.

evank

iTrader: (2)

COPS got here a couple of days ago (that was fast!) .... thanks Mr. Seller.

Tonight I removed all the outer insulation, to get this:



Next, since I don't have one of those exotic V6 Miatas , I have to decide which two of the six to eliminate...

evank

iTrader: (2)

Some progress .... finally got my Infiniti coils to JasonC, who is testing them for dwell times .... I also bought a couple of capacitors per Ben's thread at https://www.miataturbo.net/forum/t19939/ (yes I know we only need one, but I have a reputation for breaking **** the first time!) ..... next I get to organize the wires and rig up a mounting system. Fun stuff.

JasonC SBB

Evan kindly sent me Infiniti COPs and connectors.

FWIW they go down my 99/00 valve cover, but they are too long and stick up. I presume it will be too long too for the '01.

Evan what are you planning to do with the excess length?

evank

iTrader: (2)

Crap, I didn't consider the length. Would go test-fit them right now, but I just got home and the car is still hot. I'll have to wait a while.

What can be done? Is the consequence of extra length just cosmetic, or does it create an operational problem?

Update: I waited an hour, then went to test-fit a coil. There's about .5" gap between the top of the valve cover and the bottom of the coil head, as shown in this crappy cameraphone picture (ignore the coil's mounting ears -- they are not touching the valve cover; the length of the coil itself is the issue -- but I still might trim off the ears if I don't need them for mounting purposes):


I also noticed that the hole in the bottom of the coil is about 1" deep before it contacts the guts of the coil. How important is that 1" -- can I carefully trim it to .5" or is that inch something that's precise and important?

But if the length issue on top is just cosmetic, then I'm not concerned; I have several ideas for the mounting rig.

JasonC SBB

If it doesn't shake around, and water and dirt don't go in, it's OK.

JasonC SBB

For the sake of posterity I placed the dwell findings here

https://www.miataturbo.net/forum/t11744-3/

JasonC SBB

FWIW you can pull the shaft off the Infiniti COP. The shaft is like what plug wires are on a non COP setup. If one could shorten it, without causing arcing ...

Savington

iTrader: (31)

It may be easier to just use a 1/2" spacer on top of the valve cover.

Would someone mind shooting me a photo of the inside of the valve cover valley? I want to know whether I can just run a 1" endmill down the center to machine away all the stock coil mounting stuff, or whether those little mounting bosses are hollow.

Reverant

iTrader: (10)

This is exactly the same with the stock 01+ coils. Maybe one could use the shafts from the stock coils and the coilpack unit from the Infiniti COPS. Frankenstain COPS!

Jim

evank

iTrader: (2)

Yeah but then I'd need to acquire two more stock coils.

I'm going to try the Infiniti coils as-is. So they'll stick up an extra 1/2-inch, that's no big deal. Maybe I'll put something around the exposed part for (ahem) protection.

evank

iTrader: (2)

Jason, thanks for testing the Infiniti coils.

Before, I thought I could just wire them in, rig a mounting mechanism, tell MS the dwell settings, and be done with it.

Now, I'm utterly confused!

Basically I don't understand everything from, "The input requires..." to "so I couldn't measure HV output" .... is that all just background or do I need to * do * something with that big chunk of information?

For example you said some ECUs have a current limited drive and the input should not be driven without a resistor ..... is the MS (in parallel) one of those ECUs? If so, then what size resistor do I need and where does it go?

Also, re: the dwell numbers you listed -- are those for cranking or running? How do I determine the numbers for whichever setting these aren't? What about minimum discharge?

y8s

iTrader: (8)

the dwell numbers are for whatever voltage you're at. chances are your voltage drops during cranking so use whatever that is. since it's short duration, you dont have to worry about overheating the coils.

and for running, if you can enter a curve, do it. if you can't, use the 14V value.

probably 1.75 cranking
and 1.20 running.

evank

iTrader: (2)

Whoa, quite a difference from what I have now in the shared stock coils: https://www.miataturbo.net/forum/t11744-3/#post390845.

If I understand this correctly, it means the Infiniti coils are "better" because they get hot faster and cool down faster. Is that a correct assessment in simple English?

My end goal is to eliminate misfires by running a wider plug gap. Right now I have .020, because anything wider blows out above 10psi. So, COPS = better spark = I can run a wider gap. Correct?

y8s

iTrader: (8)

i wont speculate what shorter dwell times imply--i'll let jason field that.

but if they are better than the stock setup, you can indeed run a larger gap. probably at least .035.

JasonC SBB

I wasn't able to measure voltage output so I can't tell you how they compare to the other coils in terms of firing large caps.

The dwell is what it is.
Short dwell tends to mean less energy storage.
The energy storage of the Infiniti coils is less than the other coils.
However I don't know how much is wasted in plug wires.
I'm not sure how relevant it really is.

0.020" blowing out at 11 psi sounds like there's something else wrong with your setup.

Proof's in the pudding though. If you can definitely get more gap out of the Inifiniti coils then great.

I'd go with 1.2 ms running, and 2 ms cranking

JasonC SBB

I took an 01 factory coil and pulled its shaft off. Exactly the same thing as the Inf coil , just shorter. It fit on the Infiniti coil like a glove.

JasonC SBB

evan,

(answering his PM that it won't rev abouve 3000)
Where are your COPs grounded? Where is it getting 12V?

evank

iTrader: (2)

Answer to both questions is: directly from the stock coil harness. I also used a 10,000 microfarad capacitor as described in another thread (I forget whose right now.)