Hemi spark plugs????

Dannyhemi · Sep 13, 2015

I usually run champions copper. I was wondering if the iridiums or the double platinum work better for the hemi. I pretty much have bolt ons and a programmer and I would like to see some gains with different spark plugs. Would do you guys recommend.? Im really heavy on the gas pedal so what would be best for my driving habits? Thanks in advanced

RonJon '06 · Sep 13, 2015

When I did my Cam swap Inertia sent me NGK 5306 plugs. I guess the colder running plugs are better for performance applications. Don't know if you'd see any gains in performance or MPGs by simply switching spark plugs.

justin13703 · Sep 13, 2015

The absolute best plugs you can use for the hemi are regular old copper plugs. Believe it or not the iridiums and higher end plugs tend to not work as well. You wouldn't notice any power gains from just changing plugs anyway unless your old ones were destroyed. Keep in mind the recommended change interval for hemi plugs is 30k miles.

Dannyhemi · Sep 13, 2015

I just feel like the copper champions are cheap. I want to run better plugs and at the same time last me a while. I drive my truck hard

Dannyhemi · Sep 13, 2015

Justin I guess ill just use the same copper plugs

crazy_luck · Sep 13, 2015

This has been a debated discussion on the LX car page for over 10 years and digging through proven testing results they had, the only way you'll see a benefit of iridium or platinum plugs is if you are running giggle gas or have a boosted setup - otherwise you are just throwing money down the drain (and there have been reports of random miss-fire/PCM shutdown/limp mode because the voltage going thru the ignition system isn't reading properly, though those are few and far between)...

Dannyhemi · Sep 14, 2015

Crazy luck just stick with champion copper then?

ST-8 · Sep 14, 2015

Yes^ or Ngk like ronjon stated. I beat the **** out of my truck too an id throw another 25-30$ on a set of plugs Ina heartbeat. **** those $6 a plug waste of money

xtremewlr · Sep 14, 2015

NGK5306 plugs have worked great in my truck for a good long time. Over 173k miles now and I'm on my 4th or 5th set. They just work.

Dubstep Shep · Sep 14, 2015

The biggest advantage to iridium plugs would be longevity on our motors. The reason the newer Rams have 100,000 mile spark plug change intervals is they switched from the copper plugs.

Colder spark plugs don't make more power either. They're only useful in boosted setup where cylinder temps are already super high and you don't want a hot spark plug accidentally igniting your mixture prematurely.

I like the iridium because they last longer. The cost more in the end, sure, but if it saves me time and only costs a few extra bucks I'll usually do it.

xtremewlr · Sep 14, 2015

2 or 3 hours to swap plugs every couple of years or so (all 16), I'll stick with the coppers.

crazy_luck · Sep 14, 2015

xtremewlr said:
2 or 3 hours to swap plugs every couple of years or so (all 16), I'll stick with the coppers.

If you drink less beer between turns of the wrench, it takes less time... :emotions33:

justadodgeman · Sep 15, 2015

I've ran ngk and and champion copper plugs in mine. Couldnt really tell a difference with ngk but when I did my cam swap I put champion back in cause everyone says they are what the hemi likes and Taylor wires and all is good

BoostedRT · Sep 15, 2015

Limp mode/ cylinder misfire?

Hard to tell but it sounds and feels like I have a misfire or go into limp mode. It's only happened three times since I've been supercharged for about 9k miles or so. Air/fuel ratio goes all the way up to 17 and I lose power in the gas pedal and hear a slight tick from the motor. Help!

Dubstep Shep · Sep 15, 2015

BoostedRT said:
Hard to tell but it sounds and feels like I have a misfire or go into limp mode. It's only happened three times since I've been supercharged for about 9k miles or so. Air/fuel ratio goes all the way up to 17 and I lose power in the gas pedal and hear a slight tick from the motor. Help!

Dude that's BAD. You're running SUPER lean and that ticking is detonation. Your motor is blowing itself up. Get a new tune ASAP.

Use one temp colder plugs as well

dmacell1 · Sep 16, 2015

Ouch!
its way safer to run it a little rich with cooler plugs.
detonation=ring landings meltdown or worse on a SC application.

chefred112 · Sep 28, 2015

xtremewlr said:
2 or 3 hours to swap plugs every couple of years or so (all 16), I'll stick with the coppers.

..or every 2-3 mos like me

...I drive hard and fast (sometimes) but like Dan said, it's cheap enough and I want to run optimum all the time.. I just changed them saturday

HemiLonestar · Sep 28, 2015

Iridiums seem to have mixed results. Lots of people say they suck, I got set for free a while back and ran them (gasp with shorty wires!) with no problems. IMO they aren't worthy the expense. Complaints about platinums seem to be pretty consistent.

dirkbiggler · Sep 28, 2015

I put the coppers in mine. No complaints and it saves money. Learned a lesson trying to push them to 60k miles though. Dont do that!

Harley Harrold · Sep 28, 2015

SPARK PLUG – 16EA – CHAMPION COPPER PLUS 570 best to use on a stock or mild modded 5.7 HEMI. My last set went 60K, replaced with the same plugs. My engine is mildly modded.

Hemi spark plugs????

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