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Old 03-08-2008, 02:58 PM   #1
turbochad
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Default Can someone give me the right part number for.....

NGK copper plugs for an 04 STI. I have looked everywhere and there seems to be a very big debate on the right plugs for the STI. I also hear they do not make a step colder plug in the coppers. I need the correct NGK copper plug part number. Thanks in advance!
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Old 03-08-2008, 03:30 PM   #2
fobiawrx
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3672 lfr6a-11
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Old 03-08-2008, 03:57 PM   #3
turbochad
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I thought the ones ending in -11 were not supposed to be used in the STI's
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Old 03-08-2008, 04:28 PM   #4
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the ones ending in -11 have a .044 plug gap. crushing it down to a smaller gap is possible but not optimal because it changes the geometry of the tip. Any supposed 'gains' you hoped to make by using copper are completely eliminated by the non-optimal gap geometry.

Just use the correct plugs: ILFR6B
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Old 03-08-2008, 04:34 PM   #5
turbochad
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Are those copper? Thanks for the info

The reason I ask is that my tuner does not want to tune the car on iridium plugs with the meth. He wants to use copper. Is there not a copper plug with the right gap?

Last edited by turbochad; 03-08-2008 at 04:42 PM.
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Old 03-08-2008, 05:19 PM   #6
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I can tell you where the proper forum is for this question... and it ain't this one. Next time, use the right forum as a courtesy to others.
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Old 03-08-2008, 06:44 PM   #7
turbochad
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Wow, that's funny. Maybe you should find something better to do with your time. I am sure I ruined someones day by posting in the wrong forum, although it actually fits well in the powertrain forum. I know you are respected on here, but don't be a jerk because I posted this in the wrong place. Since you know it all why not just answer my question and move on?

Last edited by turbochad; 03-08-2008 at 06:51 PM.
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Old 03-09-2008, 07:34 AM   #8
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My job as a moderator is to ensure people post in the right forum. I don't have to make excuses for that. Just ensure you post in the appropriate forum from now on. As to helping...if you had read the Spark Plug FAQ, you'd have visited ngksparkplugs.com already and using their search feature for your vehicle, you'd know your options:

Spark Plug Part No. Stock No. Plug Gap Photo
V-Power LFR6A-11 3672 .030
OE Laser Iridium ILFR6B ^ # 6481 .030 n/a
Iridium IX LFR6AIX-11 6619 .030 n/a

Also by visiting that site, you'd see http://www.ngksparkplugs.com/docs/te...tnumberkey.pdf which would tell you that their one step colder plug (if they make it) would be LFR7A-11. I'm not sure if they in fact make it though. You do have iridium options though for one step colder.

Once again though you run into the -11 issue which is the WRONG gap, so you'd really like LFR7B which would be the correct, but once again, I don't think they make this type.

Denso Iridium IKH22 is the correct sized one step colder plug as seen on this thread.
NGK LFR7AIX (#2309) is the correct sized one step colder plug as seen on this thread.

Last edited by Unabomber; 03-09-2008 at 07:43 AM.
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Old 03-09-2008, 08:42 AM   #9
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in his defense though, he wasn't looking for sparkplugs from a Service&Maintenance standpoint. His tuner told him he needed copper plugs to use with Meth... So the 2.5 or the Tuning forum would have been applicable in his case
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Old 03-09-2008, 10:20 AM   #10
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Moderator fight!!!!
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Old 03-09-2008, 01:03 PM   #11
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Sorry, just pissed I can't find the right plugs. I don't understand why it is so hard. Thanks for the info Unabomber and no hard feelings! I did read all of your posts in the manifesto. So it looks like the -11 is the only copper plug available and the gap on it will have to be closed big time which is not suggested. I don't know what to do......
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Old 03-09-2008, 03:18 PM   #12
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copper plugs are usually dictated when using nitrous

ive not heard anything about using alky injection
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Old 03-09-2008, 04:34 PM   #13
turbochad
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Neither had I but P and L in Chicago says iridium plugs "freak out" when used with alky.
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