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08-17-2017, 03:28 PM | #726 |
Scooby Newbie
Member#: 346966
Join Date: Feb 2013
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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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10-11-2017, 08:58 AM | #727 |
Scooby Specialist
Member#: 128115
Join Date: Oct 2006
Chapter/Region:
South East
Location: Wilmington, NC
Vehicle: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.
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. |
04-30-2019, 04:08 PM | #728 |
Scooby Newbie
Member#: 501016
Join Date: Apr 2019
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This is exactly what I was looking for! Thanks a lot!!!
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06-05-2019, 07:44 PM | #729 |
Scooby Newbie
Member#: 436720
Join Date: Dec 2015
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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? |
09-07-2019, 05:47 PM | #730 |
Scooby Newbie
Member#: 436019
Join Date: Dec 2015
Chapter/Region:
RMIC
Location: Colorado Springs
Vehicle: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? https://www.rhdjapan.com/ngk-r7437-r...t-range-9.html Ive searched and searched and have not found a definitive answer. |
09-10-2019, 09:18 AM | #731 |
Scooby Specialist
Member#: 138994
Join Date: Jan 2007
Location: apparently I "spread the hate"
Vehicle:2006 WRX, 6MT, 5x114 |
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. |
09-29-2019, 12:54 PM | #732 |
Scooby Newbie
Member#: 171791
Join Date: Feb 2008
Chapter/Region:
MWSOC
Location: Pickerington, OH
Vehicle:2014 WRX WRB |
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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10-24-2019, 10:01 PM | #733 |
Scooby Newbie
Member#: 507717
Join Date: Oct 2019
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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?? |
10-25-2019, 01:14 PM | #734 |
Scooby Specialist
Member#: 273868
Join Date: Feb 2011
Chapter/Region:
MAIC
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10-26-2019, 01:18 AM | #735 |
Scooby Newbie
Member#: 507717
Join Date: Oct 2019
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12-01-2019, 11:17 AM | #736 |
Scooby Specialist
Member#: 373868
Join Date: Nov 2013
Chapter/Region:
Tri-State
Location: Queens, NY
Vehicle:'04 STi WRB |
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? |
12-01-2019, 11:21 AM | #737 |
Scooby Specialist
Member#: 373868
Join Date: Nov 2013
Chapter/Region:
Tri-State
Location: Queens, NY
Vehicle:'04 STi WRB |
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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12-10-2019, 04:24 PM | #738 |
Scooby Newbie
Member#: 508402
Join Date: Nov 2019
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08 2.5i
Would autolites be safe? Or should I just go with NGK
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12-11-2019, 01:52 PM | #739 |
Scooby Specialist
Member#: 13530
Join Date: Dec 2001
Chapter/Region:
NWIC
Location: Cascadia
Vehicle:EA63 , EA81T, EJ20G, EJ205 |
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12-13-2019, 06:51 PM | #740 |
Scooby Specialist
Member#: 373868
Join Date: Nov 2013
Chapter/Region:
Tri-State
Location: Queens, NY
Vehicle:'04 STi WRB |
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. |
12-16-2019, 03:50 PM | #741 |
Scooby Specialist
Member#: 13530
Join Date: Dec 2001
Chapter/Region:
NWIC
Location: Cascadia
Vehicle:EA63 , EA81T, EJ20G, EJ205 |
Interesting. I would love to get their take on why they recommend those plugs over the original part.
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05-21-2020, 08:44 AM | #742 | |
Scooby Newbie
Member#: 436019
Join Date: Dec 2015
Chapter/Region:
RMIC
Location: Colorado Springs
Vehicle:2018 STi RA #406-500 Peral White |
Quote:
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06-11-2021, 07:09 AM | #743 |
Scooby Newbie
Member#: 524271
Join Date: May 2021
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Are u still on here ?
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08-10-2021, 12:27 AM | #744 |
Scooby Newbie
Member#: 146859
Join Date: Apr 2007
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Very useful info, thanks for the write up!
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10-12-2023, 04:31 AM | #745 |
Scooby Newbie
Member#: 535789
Join Date: Oct 2023
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I installed the oem ngk's. I am registering knock readings.
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