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Overland
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I've been wondering the same thing with the Hemi. Would the Hemi benefit from the use of a MSD or other high energy coil pack and ignition system?

I am also interested in this. upgrade coil packs :) with a sweet spark plug.
 

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Overland
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Summit
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I have been looking to order these but they say Nickel. Every one talks about copper. Are these the correct plug for my 2012 Overland 5.7 Hemi?
2009-2013 5.7L HEMI Spark Plugs - Mopar # SPLZFR5C11

That is the set that I used, NGK plugs made for the Hemi.
The owners manual states a gap of 0.043", I had to adjust the NGK plugs as they were all around 0.041". I used a set off feeler gages to check and set the gap.

I know many would rather use the Iridium plugs as they are good for 100,000 miles and are now listed by Mopar. I don't mind changing the plugs every 30K miles, especially being as easy as they are to change.

I would like to learn more about the ignition system and maybe upgrading the coil packs. There has to more that can be pulled from these great engines, especially considering that the Rams are stock at 390HP and the Jeeps are at 360HP, why the difference? Just in the Tuning?

Sorry, not trying to highjack a thread, I will also search the forum to see what I can find.
 

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Overland
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considering that the Rams are stock at 390HP and the Jeeps are at 360HP, why the difference? Just in the Tuning?
I would like to know aswell, when my friend told me his 2011 ram has 390 I was like :confused::mad::slapfight:
 

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How does the connector come off the coil pack. Is there a clip you pull up or push in?
First you take off the signal wires, the connector usually has some sort of clip on it. Then you just pull the coil pack straight off, Done.
 

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5.7 V8 Hemi (2011-2013)
Mopar p/n 05149177AB (NGK Yttrium ZFR5C-11)
(.043 gap, 16 plugs, tighten to 18.5 - 22 ft. lbs.)

5.7 V8 Hemi (2014-2015)
Mopar p/n SP143877AA (NGK Iridium 1LZFR5E-11)
(.044 gap, 16 plugs, tighten to 18.5 - 22 ft. lbs.)
 

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Overland
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5.7 V8 Hemi (2014-2015)
Mopar p/n SP143877AA (NGK Iridium 1LZFR5E-11)
(.044 gap, 16 plugs, tighten to 18.5 - 22 ft. lbs.)
Nice so our 2014 Hemi's already have iridium plugs.
 

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Summit
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Can't seem to find these... Mopar p/n 05149177AB (NGK Yttrium ZFR5C-11)

Find them here:
I have been looking to order these but they say Nickel. Every one talks about copper. Are these the correct plug for my 2012 Overland 5.7 Hemi?
2009-2013 5.7L HEMI Spark Plugs - Mopar # SPLZFR5C11
As shown in a previous post.

They are s special product code from NGK "SPL" ZFR5C11.
$64.00 is a great price, a lot cheaper than the stealership cost. Others have posted problems with the Platinum Plugs so I'll stick with the "old school" copper and jump under the hood every so often. :)
 

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High Altitude 4x4
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2012 WK2 5.7 HEMI
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Any new updates? I'm approaching 30k on my 11' JGC 5.7 and wanted to know anyone have any good or bad feedback with any specific plugs.

Thanks,
Jason

Look into pulstar plugs. different technology than regular spark plugs.

You will get better mpg, and some increase in hp. Ive put them on my old Nissan 350z and made a noticeable difference.

You can get them for $124 for all 8 (more costly than stock plugs but very worth the difference)

Pulstar : Bigger Spark | More Power | Longer Life

A lot of ppl will find this hard to believe but Im telling you this makes a noticeable difference in your throttle response and mpg. (speaking from experience)

Ill buy some for my 2012 wk2 and let you know how it works out for a wk2.
 

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Trailhawk
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Interesting how a first poster is promoting a product. My experience doesn't support the claims of the Pulstar plugs.
 

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Jeep Grand Cherokee
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YES, if you have a 5.7 Hemi, Chrysler came out with a 100K mile plug, the factory installs them in their Ram 1500 (POLICE PACKAGE) pick-ups & Chargers with police group AHB.....I've run them in my 5.7 Hemi Ram 1500, and they are great, expensive, about $16 a plug as I recall X 16 about $260.00, but dealers charge 200-300 for a spark plug change with regular 30K plugs, so you still save, especially if you change them yourself......Order MOPAR part # SP-143877AA, they are NGK IR Laser Iridium # lLZFR5E, but I think you can only get them currently through a mopar dealer........
 
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