Spark Plugs: Platinum or Iridium for F/I ??
#1
Banned
Thread Starter
iTrader: (218)
Join Date: Aug 2004
Location: Seattle, WA
Posts: 4,874
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://my350z.com/forum/images/icons/icon1.gif)
I installed NGK Iridium (LFR6AIX-11) 1-step colder plugs with the stock gap when I installed the Stillen stage 4 s/c. Have been running them for about 7 months and 9000 miles. Pulled them today to check them out because I had some pinging awhile back (now fixed). Looking at them, I think it would be a good idea to change them.
Stillen's install instructions recommend NGK Platinum (PLFR6A-11) 1-step colder plugs. I know that alot of guys with various FI setups are running iridiums though. I'm just trying to figure out what to get this time around.
Does it really make a difference which of these 2 I use? Could one possibly be any better for my setup than the other? If so, why? Thanks in advance
Stillen's install instructions recommend NGK Platinum (PLFR6A-11) 1-step colder plugs. I know that alot of guys with various FI setups are running iridiums though. I'm just trying to figure out what to get this time around.
Does it really make a difference which of these 2 I use? Could one possibly be any better for my setup than the other? If so, why? Thanks in advance
![Big Grin](https://my350z.com/forum/images/smilies/biggrin.gif)
Last edited by Triple8Sol; 04-20-2007 at 11:44 PM.
#4
Banned
Thread Starter
iTrader: (218)
Join Date: Aug 2004
Location: Seattle, WA
Posts: 4,874
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Originally Posted by QuadCam
go for the NGK Copper plugs or the Iridiums......stay away from platinum for performance. Platinum, by nature, is not a good conductor. It is hard, which lends itself to longevity.
Originally Posted by eltness350
iridium and close the gap more then stock...supercharges tend to "blow out" the spark
Trending Topics
#10
Registered User
Join Date: Feb 2004
Location: columbia md.
Posts: 1,041
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Originally Posted by Triple8Sol
That's correct. It's a supercharger. Does that completely nullify what you're saying then?
#12
Registered User
iTrader: (1)
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Supercharger and turbocharger are both forced induction. You are better off with iridiums or coppers. I actually prefer copper plugs. Copper is cheaper, like 1.50$ a plug. Even if you soak them with gas they will still spark unlike iridium. makes it nice to tune with to get a car running right at idle if you foul the plugs at first.
#13
Registered User
Join Date: Apr 2003
Location: Houston
Posts: 1,756
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Posts #2 and #3 scare me....
That is almost sig worthy...
Originally Posted by QuadCam
go for the NGK Copper plugs or the Iridiums......stay away from platinum for performance. Platinum, by nature, is not a good conductor. It is hard, which lends itself to longevity.
That is almost sig worthy...
![](https://my350z.com/forum/images/smilies/icon17.gif)
#16
The Untouchable
![](https://my350z.com/forum/images/ranks/premier.gif)
iTrader: (58)
Join Date: Jul 2005
Location: Milwaukee
Posts: 1,960
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://my350z.com/forum/images/icons/icon1.gif)
my buddy is a tech for nissan and he said with iridiums 1 step colder u should close the gap a bit more...i check mine every couple of months but this works the best for me...and y r our comments scary cupcake??
#18
Registered User
iTrader: (7)
Join Date: Mar 2006
Location: Chicago
Posts: 520
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Yeah I have an opinion. I've heard that using copper is recommended because you want the spark plug to be a failing point. Copper is obviously the "weakest" of the 3 materials and will melt or fail before the other two.
In the event something were to happen that would cause cylinder damage, either to pistons, rods, valves, you name it, you'd want the spark plug to fail which would stop the combustion, or detonation process to prevent further damage.
An iridium will take the abuse and keep on sparking, a platinum even more so, but the copper would be the first to fail.
Please let me know if this makes sense, I may have worded it weird. Oh and I am speaking about FI application where more extreme detonations are expected (if they occur, when compared to "less extreme" detonations going NA).
In the event something were to happen that would cause cylinder damage, either to pistons, rods, valves, you name it, you'd want the spark plug to fail which would stop the combustion, or detonation process to prevent further damage.
An iridium will take the abuse and keep on sparking, a platinum even more so, but the copper would be the first to fail.
Please let me know if this makes sense, I may have worded it weird. Oh and I am speaking about FI application where more extreme detonations are expected (if they occur, when compared to "less extreme" detonations going NA).