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Old 12-05-2005, 01:45 PM   #1
BrandonWRX
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Default NGK Iridiums

I wanted to get the 1 step colder LFR7AIX #2309 plugs from NGK. The problem is they come pregapped to 0.032". From what Ive read, 0.028- 0.030 would be optimal on the sti and 0.032 may misfire at high rpms. One cant regap these because of the brittle iridium pads on the the top surface will break off when tryign to use a gauge to set them, or even test to see what gap they are. From the specs ive read, 0.030 is the stock iridium gap size, why are these 0.032? Do I go with the 0.032 or attempt to regap? How can I regap these?

My mods include KN typhoon, TB, with streettuner stage 2 tweaked map (timing and boost).
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Last edited by BrandonWRX; 12-05-2005 at 02:30 PM.
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Old 12-05-2005, 01:52 PM   #2
bboy
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Have you actually measured the gaps or are you quoting. If you measure them you may find they are 0.029. I recommend the stock plugs, not colder ones.

To close a gap I mash them on a hard surface and re-measure. Opening the gap is easy with one of those "coin" measure tools.
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Old 12-05-2005, 02:09 PM   #3
CBRDSpeedfactory
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isee lots of issues on the evo them blowing the spark out, so we get down around .24-.25

i tend to use a feeler gauge, as those coin gauges tend to be chrome plated and thicker than what you think.

cb
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Old 12-05-2005, 02:33 PM   #4
BrandonWRX
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"One cant regap these because of the brittle iridium pads on the the top surface will break off when trying to use a gauge to set them, or even test to see what gap they are."

this is using the "coin" gauge. when you run the gauge over the tip it can break the pads off and make the plug useless. Thats usually why NGK says not to regap and install them as is. But 0.032 is way too large i think.

CBRD: You are talking about the NGK Iridium IX? What issues do you have with them? The stock STi plugs are at 0.030.
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Old 12-05-2005, 02:38 PM   #5
_sti_05
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on the sparkplugs.com website, it says the Iridium are gapped at 0.0030?

Those are the ones im running and they work great, smooth idle and all.
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Old 12-05-2005, 02:52 PM   #6
Thran
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are u supposed to change them when u turbo upgrade? because im going to get a super 16g in a wrx....
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Old 12-05-2005, 03:15 PM   #7
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I just tapped them on a magazine on a hard surface to close the gap. Measured mine as .032 pre-gapped. Gapped to .026-27.

Frank
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Old 12-05-2005, 04:06 PM   #8
BrandonWRX
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Quote:
Originally Posted by _sti_05
on the sparkplugs.com website, it says the Iridium are gapped at 0.0030?

Those are the ones im running and they work great, smooth idle and all.


Whats the part #? Here is the info i got for the LFR7AIX.
http://www.sparkplugs.com/more_info.asp?AAIA=&pid=16602 , and it says 0.032?

"I just tapped them on a magazine on a hard surface to close the gap. Measured mine as .032 pre-gapped. Gapped to .026-27.

Frank"

What did you measure with, a feeler gauge? It seems liek those coin gauges will break the pad off.
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Old 12-05-2005, 04:08 PM   #9
BrandonWRX
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Quote:
Originally Posted by Thran
are u supposed to change them when u turbo upgrade? because im going to get a super 16g in a wrx....

Yes it would be advisable to change the plugs along with the turbo upgrade since youre going to have everything apart for the injectors anyways. Im only about 65-70 hp above stock and its recommended at 75-100hp to go to colder plugs.
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Old 12-05-2005, 04:17 PM   #10
_sti_05
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Old 12-05-2005, 04:25 PM   #11
klattery
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I don't think LR7AIX are the right model. I think it is LR6AIX - 11, which is gapped to .03, same as OEM.

But if you upgrade, then you'll want even less gap.
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Old 12-05-2005, 07:34 PM   #12
BrandonWRX
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Quote:
Originally Posted by _sti_05

Those are heat range 6, theres no reason to get a different set of plugs (the stockers are iridium) unless youre going colder. Which is why Id like the LFR7AIX, one step colder, since im running more boost and timing than stock. Ill probably have to gap them at 0.028.
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Old 12-06-2005, 06:22 AM   #13
fmowry
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I actually was very careful measuring the with the coin gauge. If you "slide/rotate" the coin around like you would on standard plugs you can damage the pad. If you are gentle and go slow, you can eyeball when it will hit, and touch it very softly on both sides, you can measure it without messing up the pad. Car is running fine. Feeler gauge would be better, but I didn't have one handy.

Frank
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