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Old 01-18-2006, 01:36 AM   #1
powerlabs
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Default Spark Plugs on JDM engines.

Some help here guys; what plugs do you use on your JDM swap?
Miles from Finelineimports told me to use nothing but bone stock USDM WRX plugs.
My engine came with some fancy needle tipped platinum plugs.
And most people seem to think you should run them 1 step colder... But Miles said he didn't... I could use some advice here... Some part numbers would be awesome too. My car is misfiring and I think its the plugs.
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Old 01-18-2006, 11:46 AM   #2
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sounds fishy to me i would order some of the fancy needle tipped plugs

i am running copper but then i am still tuning so i change them often
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Old 01-18-2006, 12:40 PM   #3
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What your engine came with means nothing. BRK series single tip platinum NGK's were stock on those engines. PFR dual tip platinums are a common upgrade. I would personally run whatever you feel like but would go one step colder. With the bigger turbo on your car, it's just some insurance...
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Old 01-18-2006, 01:35 PM   #4
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Quote:
Originally Posted by Matt Monson
What your engine came with means nothing. BRK series single tip platinum NGK's were stock on those engines. PFR dual tip platinums are a common upgrade. I would personally run whatever you feel like but would go one step colder. With the bigger turbo on your car, it's just some insurance...
Thanks!
Are those the same ones stock USDM WRXes use? Do you know the model number for the one step colder plug?
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Old 01-18-2006, 01:44 PM   #5
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I've got a set at home. I will look at them at lunch. I don't remeber the exact number off hand, but I think they are 7's...
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Old 01-19-2006, 01:54 AM   #6
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i generally run the ngk-r bkr7e11. that is the plug that i use in both my sr and my ej20g. my friend even runs them in his turbo k24 civic that i built him. they are like $1.69-1.99 each, cant remember exactly.

i have tried some iridiums before aswell. they were the ngk iridium ix bkr8eix. the were ok but the idle sucked. i dont know why but it just felt like it had a miss a idle, change back to the ngk rs and the problem was solved.

by the way i run a .025 gap on the r's. the iridiums were stock gap. i dont like to gap them for fear of breaking the electrode.
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Old 01-19-2006, 08:26 AM   #7
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Quote:
Originally Posted by silvialost
i have tried some iridiums before aswell. they were the ngk iridium ix bkr8eix.
thats hotter than stock isn't it? 7's are stock on the wrx.. perhaps the idle problem?
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Old 01-19-2006, 09:09 AM   #8
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Quote:
Originally Posted by subbyspeed
thats hotter than stock isn't it? 7's are stock on the wrx.. perhaps the idle problem?
No 6 would be hotter then stock..

8's idle bad because they are too cold..

Also not supposed to use the -11 plugs..

What you want is these. I usually gap to .028, but may go a bit smaller depending on set-up.
BKR7EIX-Irridium
BKR7E-Copper

Last edited by cronic; 01-19-2006 at 09:28 AM.
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Old 01-19-2006, 09:40 AM   #9
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does it matter what version of ej20 you have? K,G, etc.? or is it the same for COP and WS? this may help others out! -keith
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Old 01-19-2006, 04:20 PM   #10
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I just put NGK laser platinums in my EJ20g (PFR6G). Whatever you go with, stick with NGK.
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Old 01-19-2006, 04:44 PM   #11
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I looked at what I have at home. I have both BKR6e-vx and BKR7e-VX, the 7, as has been mentioned being one colder. And they are, as was described, a needle tipped platinum plug...
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Old 01-19-2006, 04:48 PM   #12
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I put in some denso irridiums that were one-step colder than the wrx stock ones. I picked irridium because changing spark plugs in a phase 1 engine is teh suk so I don't want to do it for another 7 years.
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Old 01-19-2006, 04:51 PM   #13
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Quote:
Originally Posted by Lachlan
I put in some denso irridiums that were one-step colder than the wrx stock ones. I picked irridium because changing spark plugs in a phase 1 engine is teh suk so I don't want to do it for another 7 years.
Denso's are hit or miss.. Some cars miss-fire like crazy with the denso's, some seem to do ok with them.

I just like to stick to the NGK's..
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Old 01-19-2006, 04:57 PM   #14
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Thank you very much for all the helpful replies.
I just went o NAPA and ordered some ngk-r bkr7 . I will have them gapped at .28 for starters and will report back on how it goes.
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Old 01-19-2006, 06:41 PM   #15
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i too am running bkr7e (copper) and the engine came with pfr6gs in it
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Old 01-19-2006, 06:45 PM   #16
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One thing to add since we are on the topic of plugs... I have been told you should never re-gap platinum plugs after running them. So, if you plan to experiment with your gap, go copper...
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Old 01-19-2006, 11:54 PM   #17
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On my JDM Ver8, the only plug that worked was the BKR8EIX. The 7's casued a stall in power and bad knock at 230whp. The 8's enabled another 150whp and the car runs better idles smoother and is quieter. I suspect the 9.0:1 compresion is a factor.
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Old 01-20-2006, 12:07 AM   #18
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cronic why not run the bkr7e-11?
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Old 01-20-2006, 02:32 AM   #19
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Quote:
Originally Posted by silvialost
cronic why not run the bkr7e-11?
...the -11 for NGK plugs means that the gap is 1.1mm which suits the NA engines...gapping a -11(~.043") plug down to the ~.028" needed for a turbo application ruins the gap symetry and causes issues.

per NGK, NGK plugs that have no '-x' or '-xx' suffix are pregapped at .7mm - .8mm(.0275" - .0315"), unless otherwise specified....which is the correct plug for our turbo applications
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Old 01-20-2006, 08:16 AM   #20
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i guess, but my friend and i always run these plugs in all our motors(honda kseries, nissan sr, suby ej) never run into any issues. and we always gap them down to .025 or so. we actually had the horsepower teacher at UTI tell us to use them and gap them down(tuning my friends honda on their dyno)
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Old 01-20-2006, 08:19 AM   #21
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bkr7 vs bkr7e what's the diff?
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Old 01-20-2006, 10:19 AM   #22
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Quote:
Originally Posted by silvialost
i guess, but my friend and i always run these plugs in all our motors(honda kseries, nissan sr, suby ej) never run into any issues. and we always gap them down to .025 or so. we actually had the horsepower teacher at UTI tell us to use them and gap them down(tuning my friends honda on their dyno)
That is correct. They are for NA cars.. I am just letting you know.. You can use whatever plug you chose, but figured i would let you know that is not the right plug for your application..
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Old 01-20-2006, 12:15 PM   #23
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all the cars that i listed are turbo. so....
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Old 01-20-2006, 01:02 PM   #24
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Quote:
Originally Posted by silvialost
all the cars that i listed are turbo. so....
Honda's come stock turbo? **** where have i been That is a NA honda plug that you are running on a turbo aplication..

Honestly run a minivan plug for all i care. I was just letting you know what the plug is for. You don't need to be a smart ass with me, because i could care less what you run. To the people that care, that is the wrong plug..
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Old 01-21-2006, 12:27 AM   #25
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One question: The BKR series is quoted as being the spark plug for the 2.5L NA engine... Shouldn't the WRX engine be a PFR7G??? Or does it not matter?
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