Dinnercoat

Yeah I think I'm mostly interested in how much longer they would last than say platinum NGKs. If they're lifespan was equivalent to the increase in cost I think I'd get a set.

Sideways7

iTrader: (7)

Where are you paying 25 a piece for iridiums? I got mine for 8 each.

Dinnercoat

I think the important question is where are YOU getting Denso Iridiums for 8 each?

Sideways7

iTrader: (7)

Oh, Denso Iridiums. I was talking about NGK's. And I got them at O'reilly's.

snub disphenoid

They're not really worth it if you ask me, if you factor in shipping, the plugs cost you like $110 each change, which is A LOT for spark plugs on a car that doesn't make that much HP anyways. They last a bit longer, but I haven't had a car run long enough to make a comparison. They held up well against stupidly-hot air coming from the blower, though.

Brody8877

iTrader: (10)

According to Denso they last longer, and perform better, also my teacher keep telling me to use iridium especially when you have a force induction. He tells the comparison when he change out his plugs from platinum to iridium for his BMW. He told me when he change it the plugs where shot after 10,000 miles (platinum), and the iridium he change every 20,000 miles and he tells me it still look good and can go up another 10,000 miles

First gen man

iTrader: (24)

Yes, they make trailings and leading iridium plugs for the s/4 s/5 13b. about 12 dollars each. scew those denso's, i would rather denso's but there iridiums are like 35 bucks each....

driftin8ez

Just bought my jspec 13bt and it has hks irdiums in it along with ss omp lines. Score! Maybe ill try an clean them and use them in my car for now.

ilike2eatricers

careful when cleaning them. if you've ever seen them you'll know what i mean

driftin8ez

ya the little piece that the spark arcs to is thin and seems like it would break off after one combustion cycle.

Dinnercoat

From sparkplugs.com

Originally designed to improve starting and reduce fouling in two-stroke engines, this design was found to improve performance in four-stroke engines as well. All operate on primarily the same principle, a spark plug with fine wire electrodes will perform better than a traditional plug. There are two reasons for this, first is because a smaller center electrode requires less voltage to jump the gap. This means fewer misfires, which should be seen in higher mileage and more horsepower. The second reason is smaller center electrodes reduce quenching. The smaller center electrodes have required exotic metals such as platinum or iridium so that they can still maintain (and sometimes surpass) the longevity of a traditional spark plug.

driftin8ez

cool... Looks like ill really give these a try in my old tired 13b n/a. I cant believe i got $100+ worth of spark plugs with my motor!

Brody8877

iTrader: (10)

im gonna give it a try, if result dont show then ill go back with NGK platinum.