Dodge Challenger Forum banner
  • Hey everyone! Enter your ride HERE to be a part of October's Ride of the Month Challenge!
1 - 6 of 6 Posts

·
Registered
Joined
·
2,192 Posts
Discussion Starter · #1 · (Edited)
I decided I would switch to a 1 step colder NGK Iridium plug in my 2014 R/T. I was quite surprised to find that my car already had Iridium plugs from the factory.

My goal was the colder plug so I continued with the install. However, I was also surprised at the toll that the Torco Booster had taken on my factory plugs.

My plugs have 10000 miles on them and I have used ONE 32 oz bottle of Torco and ONE bottle NOS Race formula during those miles. The orange (magnesium) coating was much thicker than I expected it to be.

The factory Iridium plug is ILZFR5E-11.

I used NGK LFR6AIX-11 plugs and the car really seems to respond well to them. My ST knock seem to be reduced. I haven't been able to go WOT, but I haven't had any ST knock under part throttle.
 

Attachments

·
Registered
Joined
·
2,192 Posts
Discussion Starter · #3 ·
I agree. I was expecting a slight orange dusting, not a thick coating. I hate having ST knock, but I'll have to combat it other ways besides MMT.

I ordered a can of Redline SL1 to clean any residue in the combustion chamber. I'm sure the piston tops are dusted or coated.
 
  • Like
Reactions: Hemisfear10

·
Registered
http://www.dragtimes
Joined
·
1,899 Posts
I decided I would switch to a 1 step colder NGK Iridium plug in my 2014 R/T. I was quite surprised to find that my car already had Iridium plugs from the factory.

My goal was the colder plug so I continued with the install. However, I was also surprised at the toll that the Torco Booster had taken on my factory plugs.

My plugs have 10000 miles on them and I have used ONE 32 oz bottle of Torco and ONE bottle NOS Race formula during those miles. The orange (magnesium) coating was much thicker than I expected it to be.

The factory Iridium plug is ILZFR5E-11.

I used NGK LFR6AIX-11 plugs and the car really seems to respond well to them. My ST knock seem to be reduced. I haven't been able to go WOT, but I haven't had any ST knock under part throttle.
I doubt that one can of TORCO and one bottle of NOS in 10K miles caused that. In fact, they look very similar to mine at 14K miles. I wonder if the orange/brown is the norm for Iridium plugs as I've seen several motors with plugs like that with no octane boosters used. My older 5.7 with copper plugs looks more traditional colored but my newer 5.7 and 6.4 look similar to yours.
Are you running a custom or 93 tune? Just curious as you mentioned ST KNK. Are you running a 180 stat and lowered fan settings? Just wondering if that could be in play as well.
 

·
Registered
Joined
·
1,417 Posts
I agree. I was expecting a slight orange dusting, not a thick coating. I hate having ST knock, but I'll have to combat it other ways besides MMT.

I ordered a can of Redline SL1 to clean any residue in the combustion chamber. I'm sure the piston tops are dusted or coated.
I doubt that one can of TORCO and one bottle of NOS in 10K miles caused that. In fact, they look very similar to mine at 14K miles. I wonder if the orange/brown is the norm for Iridium plugs as I've seen several motors with plugs like that with no octane boosters used. My older 5.7 with copper plugs looks more traditional colored but my newer 5.7 and 6.4 look similar to yours.
Are you running a custom or 93 tune? Just curious as you mentioned ST KNK. Are you running a 180 stat and lowered fan settings? Just wondering if that could be in play as well.
I have a 13 RT and only used one bottle of the NOS racing formula and had a light orange coat like the picture, just not as heavy and mine are not iridium. Wonder if its the MMT.

Redline cleaner is good stuff. I tried a few different things after I changed my plugs and noticed the color of the plugs and the Redline made the most noticeable difference. I run 1 tank before every oil change now.

Do all 14's come with iridium plugs now?
 
1 - 6 of 6 Posts
Top