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Screamin' Demon Coil

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Old 05-30-2012, 08:50 AM   #1
Shelby350Mike
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Default Screamin' Demon Coil

Ok, will the Demon Coil have any affect on my car's performance? Or are they just blowing smoke at me about this coil actually being a power booster?

(With the coil, I'd upgrade wires and plugs too)

My friend swears it will make a difference, but he had a '99 4.6L...

Thanks.
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Old 05-30-2012, 06:44 PM   #2
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Aftermarket COPs provide no power gain for an NA S197, V6 or GT. They will provide a very modest gain if you're FI but nothing to get excited about.

Most aftermarket COPs have been noted to have high failure rates. Many folks have gone back to their OE COPs due to issues.
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Old 05-30-2012, 10:03 PM   #3
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Will this be the same for a 2004 V6 also? (my friend is considering it too)
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Old 05-30-2012, 11:21 PM   #4
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The ones for the 4.0's tend to cause more problems than the stock coil packs. You wont gain power on a 4.0 from one. But if you insist, I have a SCT stick-on that will add 47 hp. Same effect.
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Old 05-31-2012, 05:27 PM   #5
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Originally Posted by tx_zstang View Post
The ones for the 4.0's tend to cause more problems than the stock coil packs. You wont gain power on a 4.0 from one. But if you insist, I have a SCT stick-on that will add 47 hp. Same effect.
Lol Mike you are too funny.


+1 to the screamin demon not doing much of anything, I have actually heard of those failing and the stock one gets the job done.
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Old 06-01-2012, 10:33 AM   #6
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You will go faster but its because of your lighter wallet
not any performance gains.

EPA requires the full fuel charge burn and the OEM packs provide that NA.

2004 IS NOT THE SAME AS THE 2005-2009 4.0s.
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Old 06-01-2012, 11:00 AM   #7
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I had a friend that had one on a 02 3.8 they really make no difference
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Old 06-02-2012, 09:16 AM   #8
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A good set of Magnacore plug wires would give you more
bang for the buck at the spark plug electrode.
You have to get the spark energy to the plug tip.
It does no good if it all leaks out thru poor OEM plug wires
before it gets there.
Just saying...
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Old 06-02-2012, 01:34 PM   #9
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Quote:
Originally Posted by 157dB View Post
A good set of Magnacore plug wires would give you more bang for the buck at the spark plug electrode....
157db, are the OE wires that bad or do you mean that over time they will degrade?
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Old 06-03-2012, 07:46 AM   #10
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Quote:
Originally Posted by 157dB View Post
A good set of Magnacore plug wires would give you more
bang for the buck at the spark plug electrode.
You have to get the spark energy to the plug tip.
It does no good if it all leaks out thru poor OEM plug wires
before it gets there.
Just saying...
I thought the 4.0's wire were fairly decent until now...
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Old 06-05-2012, 06:14 PM   #11
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So, my friend put the coil in their 3.9 today... (its a 2004) And well, HOLY CRAP there is a huge difference... Amazing. Its great.
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Old 06-05-2012, 10:05 PM   #12
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I personally bought the screaming demon pack with their live wires and the wider gap as recommended and personally I didn't feel any gain, in fact I wondered if it would miss on occasion, it didn't smooth my idle or anything they promise it cost me around 220 (100 pack, 80 wires and 40 plugs) and then an additional 40 for new stock gaped plugs and time to put the stock pack back on..
Idk about the 04 model but on our 4.0 I say DONT DO IT coulda saved me $180 plus the time I wasted.
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Old 06-05-2012, 10:28 PM   #13
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Quote:
Originally Posted by Shelby350Mike View Post
Ok, will the Demon Coil have any affect on my car's performance? Or are they just blowing smoke at me about this coil actually being a power booster?

(With the coil, I'd upgrade wires and plugs too)

My friend swears it will make a difference, but he had a '99 4.6L...

Thanks.
unless you have supercharger as i was advised
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Old 06-06-2012, 09:12 AM   #14
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I just put the coil, taylor wires, and regaped my current plugs. And I couldn't be happier. For one, there is improved throttle response, and my car pulls more in third gear now. Also, there was extreme drone with my Pypes Dual Exhaust system from 1000-3000 RPM, and the drone is completely gone. I only heard it last night going up a fairly steep hill.
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Old 06-09-2012, 09:56 AM   #15
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Quote:
Originally Posted by Nuke View Post
157db, are the OE wires that bad or do you mean that over time they will degrade?
According to the O-Scope, the 4 year old OEMs were just
loosing their ability to deliver the full spark to the plug.
The outer jackets are cracking and are just good enough
to live thru the 3 year warranty period. Period.

I am still looking for a replacement candidate.
They will not be of the 'spiral core' design.
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Old 06-10-2012, 12:37 PM   #16
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I cant imagine how on gods green earth the electrical influences exhaust note... I dont buy it. Period.
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Old 06-11-2012, 08:54 AM   #17
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Hey, I didn't buy it at first either, but the drone is legitimately gone now. I put the coil on, wires, and opened the gaps on the plugs. So that means a more efficient spark and burn, right? Which means a slight power increase and better throttle response, so therefore, it makes sense with an increased power curve that the exhaust note changed.
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Old 06-12-2012, 04:05 PM   #18
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I cant imagine how on gods green earth the electrical influences exhaust note... I dont buy it. Period.
Foolish me, the drone was soo bad on my borla stingers, I put resonators on, then ripped out the entire interior and trunk and dynamatted, still drone... all I had to do was change the coil and plug wires.. .hahaha! (ends sarcasm)
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Old 06-12-2012, 08:41 PM   #19
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I'm not being a smart guy here, it legitimately got rid of the drone I had.
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Old 06-12-2012, 08:41 PM
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