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Old 08-17-2017, 03:28 PM   #726
Caveit77777
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Quote:
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, 08:58 AM   #727
Brock31
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Location: Wilmington, NC
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2008 STi Hatch OBP
enginuity is cool

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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.

Anyway....

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 01:56 PM.
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Old 04-30-2019, 04:08 PM   #728
Flytrap
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This is exactly what I was looking for! Thanks a lot!!!
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Old 06-05-2019, 07:44 PM   #729
Steodes
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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, 05:47 PM   #730
Evoballer
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2018 STi RA #406-500
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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?
https://www.rhdjapan.com/ngk-r7437-r...t-range-9.html
Ive searched and searched and have not found a definitive answer.
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Old 09-10-2019, 09:18 AM   #731
JarHarms
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2006 WRX, 6MT, 5x114

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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, 12:54 PM   #732
jclarkwlsc
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Location: Pickerington, OH
Vehicle:
2014 WRX
WRB

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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, 10:01 PM   #733
wrxTR2007
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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
There’s probably a couple other things I’m forgetting.
But I’m having an issue when I go to accelerate around 3000rpm to 3500rpm it starts cutting out then clears up at higher rpms it didn’t 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 try’d .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, 01:14 PM   #734
motorbykemike
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Quote:
Originally Posted by wrxTR2007 View Post
it didn’t really start till i changed the plugs


hmmm

what should I change next ?
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Old 10-26-2019, 01:18 AM   #735
wrxTR2007
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Quote:
Originally Posted by motorbykemike View Post
hmmm

what should I change next ?
I didn’t 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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Old 12-01-2019, 11:17 AM   #736
GK1707
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Location: Queens, NY
Vehicle:
'04 STi
WRB

News

I'm debating if I should stick with 1 step colder plugs or go to OEM on my 04 STi. I'm currently running NGK LFR7AIX (2309)

I dynoed 325/323 on pump 93:
Mods:
built motor
1 step colder plugs
Blouch 20gxtr
ID1050x
ewg
intake
exhaust etc. bolt ons

I'm wondering if at my power levels I should go back to a OEM heatrange plug.

The car is primarily a highway driver, doesn't get driven often but does alot of road tripping. It doesn't see alot of time at redline so plug heatsoaking shouldnt be a huge issue.

One issue I do have is on NGK's website the OEM part numbers for plugs are different from 04 STi and newer 08+

04 STi plug according to NGK web site: ILFR6B (6481)
08+ STi plug according to NGK web site: SILFR6A (7913)

SO if i go to an OEM 6 heatrange, I would guess I'm going with the ILFR6B, what would be the pros/cons of the SILFR6A over the ILFR?
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Old 12-01-2019, 11:21 AM   #737
GK1707
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Chapter/Region: Tri-State
Location: Queens, NY
Vehicle:
'04 STi
WRB

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Also, not too sure if anyone has any feedback on these but NGK now has a line of "ruthenium" plugs and looks like their LFR6BHX is now a new option. Interested in getting some feedback on those.
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Old 12-10-2019, 04:24 PM   #738
Lilmanjo
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Default 08 2.5i

Would autolites be safe? Or should I just go with NGK
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Old 12-11-2019, 01:52 PM   #739
car_freak85
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EA63 , EA81T, EJ20G,
EJ205

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Quote:
Originally Posted by Lilmanjo View Post
Would autolites be safe? Or should I just go with NGK
Just go with NGK and call it a day.
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Old 12-13-2019, 06:51 PM   #740
GK1707
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'04 STi
WRB

Default

Just a note, I notice on Cobb's web site they sell and recommend 2018 STi RA and 2019+ STi spark plugs as a replacement for all 2.5L turbo engines.

Which is NGK part ILFR7H (5245) one step colder and OEM in Evo's. The gap on these plugs is 0.24.

Next plug change I will likely switch to these.
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Old 12-16-2019, 03:50 PM   #741
car_freak85
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Location: Cascadia
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EA63 , EA81T, EJ20G,
EJ205

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Interesting. I would love to get their take on why they recommend those plugs over the original part.
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Old 05-21-2020, 08:44 AM   #742
Evoballer
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Member#: 436019
Join Date: Dec 2015
Chapter/Region: RMIC
Location: Colorado Springs
Vehicle:
2018 STi RA #406-500
Peral White

Default

Quote:
Originally Posted by JarHarms View Post
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.
Since my Type-Ra came stock with those plugs I am tempted to just buy another set. On the other hand I ran the NGK Racing plugs in my 2005 STI and in my 2006 EVO and had fantastic results with both. I just want to make sure that this model of NGK Racing plugs is going to be the right ones to go with?
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Old 06-11-2021, 07:09 AM   #743
Gkc301
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Are u still on here ?
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Old 08-10-2021, 12:27 AM   #744
stevengtt
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Very useful info, thanks for the write up!
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Old 10-12-2023, 04:31 AM   #745
mantekbhogal
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I installed the oem ngk's. I am registering knock readings.
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