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Old 12-21-2005, 09:23 AM   #1
crystalhelix
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Default One step colder spark plugs, brand preference

I have found two brands (there may be more) 1 step colder spark plugs for my STi


NGK Iridium-IX LFR7AIX, stock number 2309

or

Denso Iridium Power IHK22, stock number 5345


Does anyone have a preference based on performance and life expectancy?

I have read good things about the NGK's but I have the Denso's sitting on my desk.

Thoughs, opinions.
Thanks,
Justin
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Old 12-21-2005, 09:38 AM   #2
mllrsti
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My NGK's are fine.......I am sure the Denso's will be fine.
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Old 12-21-2005, 09:39 AM   #3
2phless
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The Densos woked fine for me. They were my first replacement set. I'd heard some bad reviews but I'd be willing to bet the plugs were blamed for unrelated issues. I have run the NGKs for two more replacements. Runs the same. No crazy egts or any smoother or rougher idle... I'd pop them in.

I'd like to know if someone has found better prices (on either) than sparkplugs.com.
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Old 12-21-2005, 10:16 AM   #4
SloRice
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www.oakos.com has both for a decent price and free shipping.

I've used both. The NGK's were my first replacement set. They only lasted about 7000 miles. Then I tried the Denso's. They've been going for about 7000 miles without problems. I really didn't notice a difference between the two.
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Old 12-21-2005, 12:32 PM   #5
crystalhelix
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Quote:
Originally Posted by SloRice
www.oakos.com has both for a decent price and free shipping.

I've used both. The NGK's were my first replacement set. They only lasted about 7000 miles. Then I tried the Denso's. They've been going for about 7000 miles without problems. I really didn't notice a difference between the two.
Tim,

How was the gapping? I am going to check mine but what should they be?

Thanks,
Justin
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Old 12-21-2005, 01:21 PM   #6
SloRice
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Ummm...I want to say .3 to .33 or .28 but don't quote me on that.
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Old 12-21-2005, 03:54 PM   #7
Hunt3r
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I run NGK copper plugs 1-step colder gapped to .28 which is the lower end of the gap range for a wrx. I think the upper is .33.
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Old 12-22-2005, 12:38 AM   #8
Airborne Guy
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Hijack

Did anyone notice a great improvement in the colder plugs?
05 STi, TXS FMIC, TXS shorty Intake, TXS TBE(catless), TXS UTEC stg 2+ (17psi)

thanx
Brad
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Old 12-22-2005, 12:44 AM   #9
volkl23
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I am planning on just running TBE with an AP protune. Do you guys think a 1step colder plugs are required/beneficial or should I just go with the stock NGK plugs?
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Old 12-22-2005, 11:49 PM   #10
Hunt3r
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You don't need to go 1 step colder on your plugs unless you're pushing an extra +100hp or so over stock. I'm about 125bhp over stock and I just recently ran some Autolite platinum plugs (not a step colder) for about 4k miles and then switched back to NGK copper 1 step colder and I really didn't notice anything different. Maybe, just maybe, and this could just be wishful thinking... the 1 step colder NGK platinums are ever-so-slightly smoother and don't surge as much.
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Old 12-22-2005, 11:56 PM   #11
Uncle Scotty
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.....d000000000ds......those of you posting about 2.0's....go away.....your posts are pointless.

the OP has a 2.5 and it uses different plugs.....GOT IT?????

....stock plugs in the 2.5 are fine until ya makin serious power.....just re-gap 'em a bit tighter and be happy that ya didn't spend a bunch of $$$ on somethign ya don't really need
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Old 12-24-2005, 09:07 PM   #12
spooln04
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Quote:
Originally Posted by SloRice
Ummm...I want to say .3 to .33 or .28 but don't quote me on that.

I think the gappings closer to .28. I gapped mine around .25-.28. I little tighter.
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Old 12-24-2005, 09:12 PM   #13
crystalhelix
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Quote:
Originally Posted by Uncle Scotty
.....d000000000ds......those of you posting about 2.0's....go away.....your posts are pointless.

the OP has a 2.5 and it uses different plugs.....GOT IT?????

....stock plugs in the 2.5 are fine until ya makin serious power.....just re-gap 'em a bit tighter and be happy that ya didn't spend a bunch of $$$ on somethign ya don't really need
arg...already bought them like 2 months ago...I will throw them in anyways, I will be running C16 for autoX so I will be pushing the stock turbo to the limits.

Justin
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