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Old 08-17-2017, 04:28 PM   #726
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Member#: 346966
Join Date: Feb 2013

Originally Posted by Charlie-III View Post
That "silicone stuff" is likely dielectric grease, it's fine to have on there (actually, it's GOOD to have on there!).
Thanks I figured that during the install of the new coils. Oddly enough with the correct plugs and replacement of 3 dry rotted vacuum lines, the car runs worse and won't even hold an idle anymore. It seems to idle with the intake filter off for some reason but the filter is the same filter that's been on when the car ran fine and is clean and new in appearance. I'm lost at this point
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Old 10-11-2017, 09:58 AM   #727
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Member#: 128115
Join Date: Oct 2006
Chapter/Region: South East
Location: Wilmington, NC
2008 STi Hatch OBP
enginuity is cool


I feel like this is something I should know....but I'm bumping this anyway because I've only had this car for about 5 months.


2008 STi
Its only got a stage 2 setup (Intake, exhaust and Pro-tune)...but its dyno'd at a bit over 330 whp. General rule seems that 1 step colder is:
a)Totally bogus
b)A good idea for 75-100 whp over stock

Being that I fall into the 75-100 hp over stock area and the fact that I ran colder plugs in my last WRX with no problems, I'd like to run them again.

Stock NGK P/N is #7913 Laser Iridium SILFR6A Heat Range 6

I think I found my answer:

NGK 2309 LFR7AIX IX Iridium Plug....also (derp..I forgot increasing Heat range number meant colder)

Last edited by Brock31; 10-11-2017 at 02:56 PM.
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Old 04-30-2019, 05:08 PM   #728
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Member#: 501016
Join Date: Apr 2019

This is exactly what I was looking for! Thanks a lot!!!
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Old 06-05-2019, 08:44 PM   #729
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Member#: 436720
Join Date: Dec 2015

I would like to run one step colder Copper Plugs on my JDM 2002 STi (EJ207)

Am I correct in saying the right plug I wan to run is a BKR7E?
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Old 09-07-2019, 06:47 PM   #730
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Member#: 436019
Join Date: Dec 2015
Chapter/Region: RMIC
Location: Colorado Springs
2018 STi RA #406-500
Peral White


So wile doing my research I discovered that the 2018 STI Type-RA comes from the factory with one step colder plugs "this info was provided to me by the Heuberger Subaru Parts Department". So I would like to confirm with you all that the correct part number for the Performance NGK Racing Plugs would be:
( NGK R7437 RACING SPARK PLUGS LONG REACH in HEAT RANGE 9 "PN#R7437-9" ) Is this correct?
Ive searched and searched and have not found a definitive answer.
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Old 09-10-2019, 10:18 AM   #731
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Member#: 138994
Join Date: Jan 2007
Chapter/Region: MWSOC
Location: DeKalb-ish, IL
06 WRX Ltd


2018 TypeRA and 2019 STIs are built with factory 22401aa910 plugs which are NGK ILFR7H Laser Iridium plugs.
copper center core
iridium center tip
single standard ground
nickle core ground
5/8" hex
50.5mm insulator
max heat range 7
pre-gapped 0.024"
26.5mm reach
5000 ohm resistance
flat seat type
M14 thread diameter
NGK Laser Iridium

Prior to these models the typical turbocharged Subaru was built with heat range 6 plugs, with a few dimension variants depending on which cylinder heads you had. Personally I would stick to NGK Laser Iridium and not go into Iridium-IX (shorter life) or any fancy NGK race plugs (expensive, unnecessary, and short life) unless specifically told to go that way buy your tuner. Have you changed a set of plugs in a Subaru yet? Also I would also not go any colder than the range 7 plugs you already have. Those are plenty cold enough for any street driven car even with heavy modifications.
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Old 09-29-2019, 01:54 PM   #732
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Member#: 171791
Join Date: Feb 2008
Chapter/Region: MWSOC
Location: Pickerington, OH
2014 WRX


I'm due to change the plugs on my 14 WRX. I was on NGKs site and seen where they have Ruthenium HX plugs. The claim is that they are the best thing out now but since they are so new it's hard to find any reviews on them. Anybody have any thoughts on these?
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Old 10-24-2019, 11:01 PM   #733
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Member#: 507717
Join Date: Oct 2019

I have a 2007 wrx
Mod list-
Uel tomei header
Blouch 16G turbo
ID1000 injectors
Perrin fmic
Cobb ebcs
Cat less downpipe to a full exhaust
Car was dyno tuned running 22psi at 346hp
Thereís probably a couple other things Iím forgetting.
But Iím having an issue when I go to accelerate around 3000rpm to 3500rpm it starts cutting out then clears up at higher rpms it didnít really start till i changed the plugs ( NGK ILFR7H ) I gapped them to .23 as they were before so i took them back out and tryíd .26 still no better so my question is what should I gap them to and should I try new coil packs too??
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Old 10-25-2019, 02:14 PM   #734
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Join Date: Feb 2011
Chapter/Region: MAIC

Originally Posted by wrxTR2007 View Post
it didnít really start till i changed the plugs


what should I change next ?
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Old 10-26-2019, 02:18 AM   #735
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Join Date: Oct 2019

Originally Posted by motorbykemike View Post

what should I change next ?
I didnít ask what I should change next I asked what I should gap them to? And maybe it could be coil related from them being taken out and jostled around so just looking for input
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