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Old 02-24-2011, 02:20 AM   #1
NMZ_WRX
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Default which spark plugs to go with?

car is a 2007 WRX with stage 2 mods.
i was reading on copper wires and how they have to be replaced every 10-15k miles? Also do i need to run 1 stage colder?
10-15k seems pretty frequent to me.
I am hitting 60k soon and i am still on the stock plugs.

Any links to products suggestion would be appreciated.
i was probably leaning towards a set of NGK plugs.
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Old 02-24-2011, 08:10 AM   #2
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Just to clarify, your better plug makers, NGK and Denso, all have copper core center electrodes. What most people refer to as "copper plugs" are just the standard plugs with the bigger center electrode. The iridium or platinum tip plugs with the really small tips also have the same copper core.

The smaller tips are better because they give more fuel economy, and better power, but they are more expensive.

If your stock plug is an iridium or platinum, stick with that. It's bad for most modern cars to use a lesser plug. If the stock plug is standard nickel (aka "coppers"), it's ok to go up in plug to an iridium or platinum.
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Old 02-24-2011, 08:14 AM   #3
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Sorry, missed the colder heat range question... You can run a colder heat range with no problems. It's slightly more likely to have carbon fouling, but only if you drive like a grandma. I've been running 1 range colder in my 2002 wrx stage 2 for about 60k miles, with no problems.
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Old 02-24-2011, 08:19 AM   #4
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Old 02-24-2011, 08:20 AM   #5
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Yep I put 1 stage colder iridium densos on my wrx starting at stage 2 they run beautiful no issues.

I put em in ~50K miles felt a nice boost in power/response so my stockers were definitely toasted.
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Old 02-24-2011, 02:54 PM   #6
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NGK copper replaced ever 30k miles.

fact: copper is the best conductor. from chevy push rods to japanese flat four, NGK copper all the way
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Old 02-24-2011, 03:33 PM   #7
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NGK Iridium IX
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Old 02-24-2011, 06:28 PM   #8
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Old 02-24-2011, 11:48 PM   #9
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Quote:
Originally Posted by NMZ_WRX View Post
Only if you plan to change all 4......


Check Advance Auto parts website, they always have 20%off or better coupons, buy online and pick up in the store. I just got $40 off a $100 order, plugs for both cars, 6 pureone oil filters and a few other goodies....

@$11 per plug, +shipping, i wouldnt waste my time with these at only stage 2. Advance has the oem IX for $7.50 LFR6AIX-11.
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Old 02-25-2011, 01:23 AM   #10
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Quote:
Originally Posted by boost4life View Post
NGK Iridium IX
can you tell us why you chose these particular plugs?
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Old 02-25-2011, 03:10 PM   #11
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Quote:
Originally Posted by dakrat View Post
NGK copper replaced ever 30k miles.

fact: copper is the best conductor. from chevy push rods to japanese flat four, NGK copper all the way
The advantage of copper is heat transfer. ALL NGK plugs (and I believe all high end plug makers, like Denso, also) have the same copper in them, Iridium or otherwise.

Iridium is better for performance since it allows more energy out to the cylinder by reducing what's called quenching. Read the spark plug FAQ that I contributed to if you want more info on quenching.

The best plug for power and fuel economy is an iridium plug.
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