why are coppers better for the two?

[stockthirdgen]

I've heard alot of people on here say coppers are better then iridiums, but no one has explained why. Should I take my $40 plugs out and put coppers in? Ive only had them in there for 3,000 miles is it worth it to switch them now?

[JekylandHyde]

Copper is best for any car.
Copper is the best conductor of electricity.

The "problem" with copper is that it wears quickly.
Platinums will last longer at a slight cost of optimal performance. That is why the factory uses them.

I would use copper and change them every 3000 miles with your oil. They are only $1.75 (or os) each.

Iridiums are a terrible idea on a boosted car as the tiny electrode can break free and damage pistons, valves or both. This has happened on at least three turbo MR2s.

[TRD2000]

I've had an iridium stuck in my old head since i got the car, it would have done at LEAST 60,000 miles and hasn't fallen apart and was still working but has definately worn away a lot....

with my new head going on i'll be using copper plugs and changing them with every service. it makes it a lot less likely that a plug will get stuck again and means my engine will always have fresh good plugs without too much expense...

[stockthirdgen]

Thanks for the input, looks like I'll be taking my iridiums out as soon as weather permits.