Can you guys ELI5 what is happening with the Psyber's coils? I don't even have my motor in yet just trying to anticipate what to expect when just getting the thing running and then tuned.

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I did not say that. My table is conservative at lower spark voltages and lower RPM where coil power doesn't really matter. It is dead nuts on at 14v above 4800rpm, where it really matters.

"I have a coil which is notorious for random discharge at higher-than-OEM dwell settings, can I safely run it at higher-than-OEM dwell settings?"

Sorry, didn't mean to spread misinformation. I'm not as great only having access to this forum on phone. My mistake as I'm trying to recall from memory, coordinate from the wrong coast, and haven't been at a computer for a week. Just trying to see if there are any quick answers I can shoot over before they pull the car off the dyno for the second time tomorrow morning. At this point I'm spark limited and will likely be looking at alternatives if replacing the coils don't help.


Also as a data point, I've had 6 AC Delco coils ended up dying, brand new, one every month, sequentially, and I had to replace them on the spot with whatever I could find locally, which was Napa Auto.

Since replacing with the Napa auto sourced coils, the car has never sounded like a subaru/run on 3 cylinders ever again. So the 'which brand coil is better' game is a bit troublesome at times. AC Delco bombing out 6 for 6.

For as awesome as d585's cracked up to be I've had quite a bit of trouble. Didn't mean to kick up dust in Sav's golden contributions but at this point I'm questioning the merits of running a "coil which is notorious for random discharge, " simply because it's easy button and in vogue.

I suppose I'm the 1% whose mileage has varied. Perhaps it's just a sign at what demons to expect when running this miata as a daily. Thanks for the responses!

Where did you buy the "AC Delco" ones? AIUI, there are a bunch of counterfeits out there in "AC Delco" boxes.

--Ian

The first four I got from Amazon when I first purchased the SADFab bracket.

https://www.amazon.com/gp/aw/d/B000BYD3Y0/ref=mp_s_a_1_2?ie=UTF8&qid=1494986744&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=Ac+delco+ d585

Now after all this Timken crap and other counterfeit products on Amazon, I would half expect any auto part to be crap copies. But the two that where purchased as replacements came from CarQuest.

One coil would fail per month. First cyl 4, then 1, then 2 and 3 and randoms between. Finally they where replaced with Napa stuff and never failed. I keep an extra in the glove box just in case. But the problem is whether or not the electronics are well characterized and comparable to properly functioning oem GM/AC Delco

All else fails I'll just leave the tune where it is and just live with it. If I where to do this again I'd be interested in the AEM 30-2852/IGN 1-A mentioned previously in the thread. Just have to see if there's enough real estate on the SADFab bracket to adapt.
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So you got four counterfeits, replaced them with sub-par but reliable NAPA coils, and are now running into the limits of those. Go to a junkyard and pick four coils off a Silverado. Used OEM is still OEM.

isn't acdelco oem to gm? Perhaps the four from Amazon where junk despite seller being acdelco. Do we know counterfeit parts are dealt out of other suppliers like carquest? If not why would it behave the same?
i was just happy I got to stop treating coils as consumables with my subpar but good enough for daily Napa coils that won't leave me stranded at a moments notice.

All things I'll have to deal with after I get back from San Diego after it gets unloaded tomorrow morning. Either way I lost time again on the dyno so I probably won't have it resolved till fall.

kindof counterintuitive to think the only good coils are used coils but it's worth a shot. I've already gone through a couple hundred dollars of them. Just gotta land the dream set.


I'll ask if I can work out a slot after re re replacing the coils and switching the plugs up, otherwise, this will just have to suffice for now.

thanks for input and responses
poscats issued

Just because the box says "AC Delco" on it doesn't mean they're real. Counterfeit coils come in counterfeit boxes.

If you want to be 100% sure they're genuine GM, you have to buy them from a Chevy dealer.

--Ian

Back when miata people first started using GM coils I tried out just about every cheaper aftermarket GM coil you could find. I bought them from Advance Auto, AutoZone, Napa, OReiley's, local parts place, and online. All of them were crap and I would have all sorts of issues. Now I only use OEM from a truck in a junkyard.

If a coil is purchased from a Chevy dealer does the box maybe say GM or something and the AC Delco coils are just another aftermarket choice? I recall the lower power LSx truck coils that are not d585's are made by Mitsubishi. I don't know who manufactures the d585 OEM coils but if they are using Mitsubishi to make some of the components then they aren't having Delco produce everything they use. I wouldn't assume Delco was the OEM supplier by default just because they are a subsidiary company.

This should be taglined in the outline of the thread (along with Sav's updated dwell info) . I'll do some digging on used coils and see if there are any pick and pulls in the area but sadly car gets unstrapped today.

Do any of you fine gentlemen have a spare set they are willing to part with?

Flexfuel Tahoe ones with the little heatsinks on the back, right? I have a set of completely untested greasy dirty ones from a junkyard in a plastic bag here under my desk:

https://cimg0.ibsrv.net/gimg/www.mia...1a1ca278d7.jpg

They should be OEM AFAIK.

Also:
Halcyon and I both ordered our coils from those guys some time ago. They actually know what is in their yard and ship quickly. Bonus nachos in that they'll take a credit card over the phone. Just make sure you are asking for a specific application you know to be correct, don't ask for D585s because they won't know what you are talking about. ;-)

We also sell our coils separately, if you're interested. :bigtu:

https://squareup.com/store/hawleyper...em/extra-items

Who actually makes the coils is the question. Are they OEM from GM?

Apparently the dealership notes that GM and AC Delco are two different vendors for the coils. DELPHI is listed as the OEM supplier in the notes for this round coil. The lower powered square ones are made by Mitsubishi, as noted previously.

https://cimg3.ibsrv.net/gimg/www.mia...db2bbda904.png
. https://cimg1.ibsrv.net/gimg/www.mia...2097b8068b.png

We only sell GM factory take-offs.

Does anyone have a part number for the connectors from NA6 Harness -> Coil harness ? I got a GM coil harness when I bought the bracket and coils from Hawley but I'm not certain how to connect the two. Or am I using the OEM coil harness connector and rewiring that with the GM coil connectors?

Your 1.6 has an ignitor. First you need to get rid of that.

You have a lot of reading to do.