GT-R Spark Plugs - $100/6

osbornsm

Morning all,

Was shopping for GT-R plugs and found 6/shipped for $100. Which is a lot better than the $130 you pay most places.

Got them from Autoplicity.com, just for reference.

Happy Shopping!

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FairladyZ40th

What material are they? Is the link to the part directly?


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FairladyZ40th

Ok I saw em. Don't buy them


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FairladyZ40th

Do not buy iridium spark plugs if you're looking to gain power.


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osbornsm

Care to elaborate??

Sounded like NGK was the shiz?

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FairladyZ40th

NGK is the shiz. But when it comes to conductors of electricity iridium and platinum is crap. Usually that results in a lesser quality spark, which translates to a lame ignition. So just because a GT-R uses it, doesn't mean it's better or best. They're expensive BUT that is only because iridium is a poor conductor of electricity which means it does not heat up as much and does not need to be replaced often.

I personally do not recommend platinum or iridium if you're looking for performance.

If you don't care about performance and you want longevity of spark life then yes get iridium.

Do the research you'll see what I mean.


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Felix 808

Yep

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Spooler

I do not agree with this statement. They have advantages, especially in a forced induction application. If you are NA, just replace them with the factory plugs (Denso) or NGK replacements.

JARblue

Just a few comments from The Google:

Iridium melts at a very high temperature and does not oxidize. Iridium plugs are used in aircraft piston engines for this reason.

Platinum does not melt at a high temperature. It does, however, not oxidize. SO they are good for OEM engines for people that don't want to replace their plugs all the time. Don't use them in a high-power engine, though.

Copper melts at a decent temperature and is the most thermally and electrically conductive common metals. It does oxidize, though, so they have to be changed periodically.

Iridium plugs are often marketed that the fine center electrode reduces the voltage requirement for spark.
Translation: The pinprick of pointy metal aka iridium electrode makes an excellent hot spot in the combustion chamber, allowing pre-ignition to destroy your engine. Also, lowering the voltage requirement for spark to bridge the plug's air gap reduces the amount of energy discharged from the coil, which in turn reduces the amount of amperage available to flow across the initial ion trail and form a decent plasma kernel, whereby you have trouble igniting charge densities that are mundane to a properly designed spark plug with copper, steel, or silver/nickel electrode that cost as much as 1/6th the price.

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FairladyZ40th

Iridium is a terrible shitty conductor sir. So it's a terrible shitty spark. Which means lame performance. Also, the fact that they have to shape them so thin makes them not produce so much power. Here's why I found:

"Many people come to the point where they are forced to change the spark plugs on their vehicle and face a difficult decision; copper spark plugs or those of another type? You can find spark plugs in a variety of different metal combinations, including aluminum spark plugs, iridium plugs, platinum and more. Copper core spark plugs are still the most commonly seen, however, and many people agree that they are the best. However, the advertising that accompanies the different types of spark plugs is potentially misleading, so it's important to recognize the real difference between the spark plugs in question. In order to do that, it's necessary to first learn about what the metal in the spark plug is used for.

Purpose of the Metal
The metal in a spark plug serves a single basic purpose: to channel the electric energy from the plug wire through the spark plug so that it can be forced to the engine block in the form of a spark. Therefore, any metal that conducts electricity at all could potentially be used for a spark plug. The metal should also not get too hot; one of the main problems with some metals is that they overheat quickly, causing the electric charge itself to be compromised and the spark plug to not operate as smoothly.

Copper Spark Plugs
Copper spark plugs are generally considered to have the best performance of any spark plug type. This is potentially different from what advertising companies suggest, but the other metals are, unfortunately, not as conductive in general as copper is. Platinum and iridium plugs are more likely to overheat, which causes damage to the plug components and can compromise the delivery of the spark to the engine block.

Platinum and Iridium Plugs
Platinum and Iridium plugs perform at a lower level than copper spark plugs, because they are less conductive and they tend to overheat. However, the overall longevity of these two types of metal is better than copper plugs. In reality, copper has the best performance of all three and the worst longevity. Platinum has good longevity and the worst performance. Iridium has good longevity and a performance that is decent, which is why iridium plugs tend to be more expensive than any other type. Still, the difference between these plugs in terms of overall quality is minimal, as there is a trade off for each.

Most copper plugs need to be changed every 20,000 miles or so. Platinum and iridium plugs can often go for twice that before they require changing, but the overall performance will not be as good and you may have to deal with overheating of the plugs. This is potentially not worth the added cost of both platinum and iridium spark plugs, although the decision will depend upon your preference."

-
http://m.carsdirect.com/car-repair/c...op-performance


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Chuck33079

Pretty much every oem performance car used iridium, especially turboed ones. Pretty much every tuner will recommend iridium for a FI Z. Copper is better if you like changing plugs every 10k in a boosted application. Buy the gtr plugs and go on about your day.

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FairladyZ40th

The end question is.

Longer life or better spark?

And these statements are all correct.


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Chuck33079

The difference is negligible with modern coil-on-plug ignition. If you're running some 40psi monster and the spark is blowing out, switch to copper. For the rest of the world, go with the iridium and lose no sleep over it.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

FairladyZ40th

What he said...


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osbornsm

I'm getting plugs to help with the detonation that i am getting @ 4k RPM.
This will also be beneficial for road course duty as these plugs are meant for a boosted GTR when compared to my OEM compression.

We can't get a colder plug without going to the racing series @ $50 each.

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