BAD LUK

I went to my local speed shop yesterday to pick up some stuff for a tune-up. After I told the guy I already had some plugs and that they were iridium, he said that they were trash and that copper works best!!
I told him that the main reason I got the AC Delco Iridiums was that I didn't want to change plugs evey year (plus I found a deal).
He said that "you can't do any high performance stuff with those plugs because the iridium has too high of a resistance".
WTF!?!?!?

PureWS6

Iridium does have a higher resistance than copper, but I dunno about the statement of "you can't do any high performance stuff with those plugs because the iridium has too high of a resistance". I think he was just trying to sell you some new plugs. I personally use the copper TR55's because they are cheap!

stevied916

iTrader: (30)

copper is a better conductor

Eurospec2

iTrader: (2)

True, i prefer NGk's have never let me down

Z ROADSTER

Then whats the big deal with platinum & double platinum & even triple throw down platinum plugs not to mention iridium plugs.
If plain ole NGK split plugs are so good why does GM put DENSO made iridium plugs in the Z06 ?

INMY01TA

iTrader: (1)

I wouldn't say they're junk. Go ahead and use em if you like. I use copper cause they're cheap and I like changing em every once in a while.

Xth105

iTrader: (2)

Guess all 2003 and up Z06's are junk. I had Delco IR plugs in my car and guess what, they worked fine and I would not even need to worry about them for years.

radz282003

iTrader: (1)

It's my understanding platinum and iridium plugs run hotter and will contribute to detonation, especially in FI applications. Because they run hotter they can keep themselves cleaner, thereby lessening the frequency of changing them, but like I said, because they run hotter they tend to preignite the air-fuel charge.

If you're only a bolt-on car, I'm sure you'd be fine. On an FI car, perhaps some TR6s are in order.

BAD LUK

I there something that can be done (if necessary)with tuning when using these plugs?
If they "make more power" then fine. Even if they didn't, the main reason I use(d) them is for the fact that you don't have to change them as often.
Plus, like you guys say, the ZO6 comes with these "junk" plugs from the factory. I think even my girl came from the factory with the platinum ones.
Whatever.

JMBLOWNWS6

iTrader: (17)

I have made 420 rwhp with NGK tr55's,500 rwhp NGK tr6's,623 rwhp TR6's and almost 700 rwhp with NGK race plugs. Stick to what is tried and true.

vettenuts

iTrader: (4)

Based on a recommendation from Katech, I put the Denso Iridiums in my car when I did the heads. No issues at all.