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Originally Posted by 92TripleBlack
1 - Sooo, How much and why?
2 - Will they last 100k miles?
3 -Will they give us better mileage? Power? Etc. and please quantify the answers such as 5% or 2 mpg, not answers like Yes, you can experience better mileage. A tenth of a mile on a full tank is better mileage but negledgable at the same time.
Thanks and I'm curious and interested.  |
1 - Not sure if you're asking how much do they cost, or how much improvement will they give. In regards to cost - NGK's Iridium IX plugs (iridium center electrode, copper ground electrode) are $6.95, Denso's equivilent is $11.95. NGK also has an $11 iridium plug that has Iridium center electrode, platinum ground electrode.
2 - The manufacturers generally recommend that platinum be changed at 30k and iridium at 60k, but under normal use, they usually last a lot longer - platinums usually last at least 60k and iridium 90k plus.
3 - I know you're going to hate this answer, but "Yes, you can experience better mileage". The key is really the fine wire center electrode more so than the iridium or platinum itself. Fine wire plugs give better mileage and more power, but a copper wears too fast to make a fine wire plug out of it, so they have to use platinum and iridium tips on the fine wire plugs in order for them to last long enough. Unfortunatly, I really can't give you any hard evidence on how much power/mileage you'd gain by using iridium plugs - Plugs give different results dependant on the vehicle, mods, etc. We're about to run dyno's on an SRT-4 with new copper plugs, then new iridium plugs. But the results from that test wouldn't necessarily reflect the results you'd see by running iridiums in your Titan. Some people use iridiums for the increased power, some solely for the longivity (for example if its an all day project just getting to the plugs) I'd talk to a number of guys who've used iridiums in their Titans and ask them if they saw improvement and if they felt afterwards that it was worth the money spent.