Anyone running iridium plugs in their SR? I'm curious to see what the difference is or would be. I've heard from most on FA.com that say they like them better and are finding them for close to the same price. I want some input if possible.

 

Bump....anyone?

 

i have iridium fusions in my KA...lol..

 

iriduim give off a better spark. a better spark means a better combustion, a better combustion means a happier engine.
It might not produce more power, however, you should tell that your engine is happier. the downside is, iridium typically has a shorter life than normal plugs.

 

iridiums actually have a longer life than coppers.

there are many schools of thought on it:

-coppers are cheaper, nascar and top fuel run them, blah blah blah. top fuel and nascar also run ignition systems that are alot more powerful than stock, amp wise. coppers are great conductors, but this also means they attract all the residue and whatnot, and foul faster....this is why every 2-3 oil changes, you need new ones (but it works since they are cheap).

-people say not to run platinums in boosted cars. there's really no problem with this, but theyre mostly just the middle ground. coppers are cheaper, and iridiums fire better for the price.

-iridiums dont require as small a gap as coppers to get the same spark, and last alot longer. the copper vs iridium arguement is null since changing coppers out every so many times @ a cheap price is just about equivalent to changing more expensive iridiums out once in a great while. iridiums have worked well in many KA/SR boosted applications.

basically find your heat range that suits you, and start with a good quality gap. the more gap you have the more spark there is, better burn, etc etc. you want to run the largest gap you can without having it blown out (misfiring).

try some bkr7eix plugs at .030". if you're running over 14-15psi, you'll likely need to use a .028" gap, or run a .025" gap to be safe and not have to worry about gapping down later.

 

didnt read all the above posts, but i run NGK Iridiums in my sr, and it runs great, never had anything else in them so i dont know the dif tho...

before you buy them though shop around, one shop was charging me close to $13 a plug, while another a mile away had them for $6 lol.

 

all wrong
Mike I have ran iridium plugs and I wont ever use them again.
Iridium last longer, except for me (500 club SR) they all poop out the same for me and they are little more money. Not that I go cheap on my SR its just that copper has worked the best for me in 200+ dyno runs ranging from 250hp to 550hp.
Copper owns iridium in conductivity. With more than twice the amount of thermal conductivity than iridium. Copper does have a lower heat tolerance than platinum and iridium, but copper has thicker electrodes to counter this. I have not been able to melt copper plugs under punishing abuse so you will have nothing to worry about. Copper does need more ignition then the others but you have manly SR coil packs, so no worries there. Thats my input of facts and my opinions for now feel free to ask me about pre-ignition which is another pro to copper plugs next time you see me at XAT. We can also compare some dyno charts. Copper FTW!

 

not trying to argue or anything but what kind of copper plugs are you all running? something is telling me that it isn't just the autozone autolites or anything like that.
I don't know if I read it wrong or what but i was left with the impression that he was talking about the standard plug you get at autozone, in which case, autolite coppers versus ngk iridiums, the iridiums win hands down.
I've always been told that iridiums wear out faster... must be an old myth... cuz i keep hearing otherwise. i could be all wrong, but to my knowledge, there is a big difference between the cheapy copper plugs and the higher price range copper plugs. iridium falls somewhere in between.
like i said, i could be wrong....

 

for all intents and purposes the only spark plug is NGK

 

so than basically get iridiums cause there better than regular ones than lol they just dont last as long though