performance ignition coil. - JeepForum.com

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post #1 of 24 Old 07-05-2013, 12:35 PM Thread Starter
davidtownsend
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performance ignition coil.

I'm thinking about upgrading my coil to one on Ebay that is selling the coil with the 8mm wires. I tried to search but I couldn't find any zj threads. What is the stock voltage on a 5.2? Would it be worth it to upgrade it? I'm thinking about going with ngk chopper v-power. If I do get an upgraded coil should I keep the plug gap to .35 our should I go bigger? Here is a link to the one on Ebay that I was looking at. This one looks like it is for the 4.0. Is there a certain one for the 5.2? Let me know if there is a better one out there.

http://www.ebay.com/itm/JEEP-45K-Vol...41fd8c&vxp=mtr


1994 Jeep Grand Cherokee 5.2L Limited
2006 Jeep Grand Cherokee Overland 5.7L Hemi
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post #2 of 24 Old 07-05-2013, 12:48 PM Thread Starter
davidtownsend
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I looked on Amazon and found Accel, msd, and jegs. I feel more comfortable with these beans then the Ebay one. And I would want to upgrade the wires cap and rotor as well. Thanks for the help!

1994 Jeep Grand Cherokee 5.2L Limited
2006 Jeep Grand Cherokee Overland 5.7L Hemi
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post #3 of 24 Old 07-05-2013, 12:53 PM
PolkaPower
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You can buy the ignition upgrade from Kolak
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post #4 of 24 Old 07-05-2013, 01:01 PM
riot1987
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Does it make a noticeable difference?

http://www.jeepforum.com/forum/f22/riots-97-grand-1436100/

Build thread^^
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post #5 of 24 Old 07-05-2013, 01:06 PM Thread Starter
davidtownsend
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Quote:
Originally Posted by PolkaPower View Post
You can buy the ignition upgrade from Kolak
I just remembered that! I'm going to email him and get the price for that. Does it help the engine at all?

1994 Jeep Grand Cherokee 5.2L Limited
2006 Jeep Grand Cherokee Overland 5.7L Hemi
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post #6 of 24 Old 07-05-2013, 01:07 PM
HighLonesome
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I think stock is like 32-35 kv.

Carry your old coil as a spare.

Gap the NGKs to .040-.045

Looks like a decent upgrade. You could do this for not much more and get a cap and rotor too...

http://www.summitracing.com/parts/ms...view/make/jeep
http://www.summitracing.com/parts/su...view/make/jeep
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post #7 of 24 Old 07-05-2013, 01:07 PM
B93
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I just replaced the cap, rotor, plugs, wires, and added a MSD coil. Can't say it made a noticeable difference. However, my engine has about 340,000 kms on it and I'm getting some exhaust leaks fixed today so that may be why I didn't notice a difference.

1998 Grand Cherokee 5.9 Limited. ~356,000 kms
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post #8 of 24 Old 07-05-2013, 01:15 PM Thread Starter
davidtownsend
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Quote:
Originally Posted by HighLonesome View Post
I think stock is like 32-35 kv.

Carry your old coil as a spare.

Gap the NGKs to .040-.045

Looks like a decent upgrade. You could do this for not much more and get a cap and rotor too...

http://www.summitracing.com/parts/ms...view/make/jeep
http://www.summitracing.com/parts/su...view/make/jeep
That looks pretty awesome. I emailed kolak as well to see his prices and if he had anything to add.

1994 Jeep Grand Cherokee 5.2L Limited
2006 Jeep Grand Cherokee Overland 5.7L Hemi
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post #9 of 24 Old 07-05-2013, 01:27 PM
HighLonesome
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Now I'm thinking the stock is around 30kv.

So a higher voltage should allow you to gap the plugs wider, providing a hotter spark. Plus the stock gap is very conservative because the gap widens as the plug electrodes wear down. So gapping close should make the plug last longer. Anyway a hotter spark should give a more complete burn and lead to things like smoother idle, extra power and better mileage. Its a pretty nice theory I think it does help but the improvements are pretty small.
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post #10 of 24 Old 07-05-2013, 01:36 PM Thread Starter
davidtownsend
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Quote:
Originally Posted by HighLonesome View Post
Now I'm thinking the stock is around 30kv.

So a higher voltage should allow you to gap the plugs wider, providing a hotter spark. Plus the stock gap is very conservative because the gap widens as the plug electrodes wear down. So gapping close should make the plug last longer. Anyway a hotter spark should give a more complete burn and lead to things like smoother idle, extra power and better mileage. Its a pretty nice theory I think it does help but the improvements are pretty small.
That sounds good. Hopefully all my improvements will add up soon!

1994 Jeep Grand Cherokee 5.2L Limited
2006 Jeep Grand Cherokee Overland 5.7L Hemi
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post #11 of 24 Old 07-05-2013, 03:47 PM
coralman
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Rat never had a good opinion about the accel coil.

Info on projects and repairs categorized by system
http://www.jeepforum.com/forum/f13/c...-faqs-2863665/

Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
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post #12 of 24 Old 07-05-2013, 07:41 PM Thread Starter
davidtownsend
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Quote:
Originally Posted by coralman View Post
Rat never had a good opinion about the accel coil.
I will definitely stay away from accel. I'm thinking about kolak's or the links highlonesome put in his post.

1994 Jeep Grand Cherokee 5.2L Limited
2006 Jeep Grand Cherokee Overland 5.7L Hemi
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post #13 of 24 Old 07-05-2013, 09:54 PM
Uniblurb
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I went with the Accel super coil and seems to work well in my 96 4.0. Believe Rat's only gripe with the Accel is he said they don't last very long and guess I'll find out.
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post #14 of 24 Old 07-05-2013, 10:06 PM
ZeeJay1997
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I'm running the factory coil on mine. I took it off when the PCM was giving me fits. Found it in my spare parts box a couple of months ago and reinstalled it because the low end NAPA coil never impressed me much. Worked good, just looked kinda chincy.
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post #15 of 24 Old 07-05-2013, 11:50 PM
xcaliber81
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As far as I can tell mine is original also pretty good considering its got almost 500000 kms.
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