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Jacobs Electronics Ultra-Coil works great!

Yeah, I know, do not EVER install a non-stock coil or you'll fry the ECU.

I felt the copper plugs were not firing at full force in the lower revs, so I found a coil from Jacobs, bought it for $50, installed it today, and I couldn't be happier.

Will post pics tomorrow.
Old 05-26-2010, 05:21 PM
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Now any kind of engine running problem and you get to wonder, is it that non stock coil I used? Cause maybe it will be, maybe it won't.

Years ago I put a non stock "hot" coil on my car, and it ran great, no change really, but it still ran, until about a year and half later the engine started randomly stopping and if on the highway so the rpm didn't drop too much, starting again. Coil checked out fine, but turns out it was known to fry ignition switches and I think even started some car fires due to the higher current draw.
Old 05-27-2010, 02:55 AM
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BTW there is no "full force" on spark plug firing, either the fuel mixture ignites or it doesn't, there is no better or worse. The factory system is guaranteed to fire under all conditions every time for 50k miles or the dealer has to fix it free, so its pretty robust under any remotely stock application.

You might be even happier with a full MSD ignition system.
Old 05-27-2010, 03:02 AM
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I hear ya. I think my coil was worn out, and the Jacob's is not exactly a hotter coil, just a modern coil. Check it out.

Amazon.com: Jacobs 380876 Ultra Coil, Universal: Automotive
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1982 Porsche 928, Auto, 4.5
http://i72.photobucket.com/albums/i166/hethaerto/928Mist2.jpg?t=1305333945
Old 05-27-2010, 04:37 AM
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I would be concerned about the current draw of the coil and what the ignition system was designed to handle.
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1986 928S
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All stock, automatic, 539 Weissgold Metallic, 60K original miles, Goodyear F1 tires.
Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L
Old 05-27-2010, 05:12 AM
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Quote:
Originally Posted by harborman View Post
I would be concerned about the current draw of the coil and what the ignition system was designed to handle.

Seems a worn out coil would draw more current than a new one.
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1982 Porsche 928, Auto, 4.5
http://i72.photobucket.com/albums/i166/hethaerto/928Mist2.jpg?t=1305333945
Old 05-27-2010, 05:24 AM
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Quote:
Originally Posted by Maleficio View Post
Seems a worn out coil would draw more current than a new one.
Yes, it may even destroy or damage the electronic system. But, I would not exceed the ratings of the original coil, especially on the primary side, especially if it's transistor driven.
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1986 928S
32 valve engine
All stock, automatic, 539 Weissgold Metallic, 60K original miles, Goodyear F1 tires.
Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L
Old 05-27-2010, 07:17 AM
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It appears my old coil was an electrical black hole.

The car's running lots better, and my voltage reading is actually stable now, and never drops below 13 on the dash gauge, whereas before it would fall to 10 volts at idle.

The coil says Accel because they bought out Jacob's. It's a Jacob's coil branded Accel.


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1982 Porsche 928, Auto, 4.5
http://i72.photobucket.com/albums/i166/hethaerto/928Mist2.jpg?t=1305333945
Old 05-27-2010, 09:10 AM
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I get known good and guaranteed used coils from 928Intl for $20 each, and don't have to think about whether or not its the coil causing any troubles.

Not posting this to chew on you, just so that you don't lead anybody else down a bad path. Porsche built these cars as 150 mph daily drivers, so when you tinker with their design, use alternate parts, working fine for a few days or weeks around town isn't proof of goodness.
Old 05-27-2010, 10:01 AM
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So I guess I should install a Bosch coil even though the Jacob's is working great?

Jacob's is the only company I trust for aftermarket ignition components. I've had bad luck with coils from other companies.

If this coil screws up my car in any way, I'll tell everyone immediately what I did, and how it went wrong, just like I did with the Pulstar plugs that I fouled with Amsoil Powerfoam.
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1982 Porsche 928, Auto, 4.5
http://i72.photobucket.com/albums/i166/hethaerto/928Mist2.jpg?t=1305333945
Old 05-27-2010, 10:29 AM
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By the way, the screw-on terminals on the Beru plug wires are very cool. I've never seen a design like that before.

Are the threaded terminals available without the wires?
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1982 Porsche 928, Auto, 4.5
http://i72.photobucket.com/albums/i166/hethaerto/928Mist2.jpg?t=1305333945
Old 05-27-2010, 10:30 AM
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Been running the Jacob's coil for eight days without a hiccup.
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1982 Porsche 928, Auto, 4.5
http://i72.photobucket.com/albums/i166/hethaerto/928Mist2.jpg?t=1305333945
Old 06-02-2010, 03:20 PM
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Im ma gonna use the coil offen my 'ol John Deere!
-K
Old 06-02-2010, 06:37 PM
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Quote:
Originally Posted by Maleficio View Post
So I guess I should install a Bosch coil even though the Jacob's is working great?
As long as its running fine, maybe not, but it would be the first item I would change if any troubleshooting was required. Second would be the normally rock solid ignition box in case the coil damaged it.
Old 06-03-2010, 09:26 AM
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FYI - some good discussions of Jacobs vs Bosch coils, etc on Shoptalk forums Shoptalkforums.com • View topic - Proof that the Bosch Blue Ignition Coil is WEAK!
and
Shoptalkforums.com • View topic - MSD 6A and Bosch blue coil?
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If it works, take it apart and find out Why.
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Old 06-07-2011, 11:46 AM
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Quote:
Originally Posted by larrym View Post

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Old 07-12-2011, 11:56 PM
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Quote:
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The links refer to VW's back in the 70's still using mechanical points in the distributors, and I don't agree with what they have to say even in those conditions.
Old 07-14-2011, 12:51 AM
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Don't sweat it dude. My 928S has had a Jacobs E coil for 2 years. It runs great. However, my 944 boiled one but it was used out of a junk yard. The Jacobs coil has an application for the 944. The 928 with a similar engine bank and fairly similar electronics should do fine.
Old 07-14-2011, 03:23 PM
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I tried both a pair of Crane units & a pair of MSD units (coils too on both) back in 1999: fried all 4 units, even though I verified my wiring feed (coil feed) from both MFR's. Both MFR's replaced the units for me, but there was no way either of those were going back on my 86.5 car.
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Old 07-15-2011, 06:46 AM
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Old 07-15-2011, 06:46 AM
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