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Old 12-29-2009, 04:17 PM   #1
kotea
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Have a Nice Day? EJ20G spark plugs

hey so car wont hold boost and i am like 90% sure that its spark plugs
need to know what the stocks are. if this isnt it then i know its a boost
leak. really hoping this is it.
please let me know asap!! thanks!

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Old 12-29-2009, 04:42 PM   #2
dr3w
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What do you mean by "wont hold boost" ? if it means what it actually means as in your boost is dropping then your spark plugs have zero to do with that.

But for reference a stock ej20g should be running PFR6G's, but alot of people use the BKR6E's
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Old 12-29-2009, 05:24 PM   #3
kotea
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boost cuts out i am going to try this since i am pretty sure those arent the spark plugs i have in. will let you know! if its not the problem then i will let you know.
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Old 12-29-2009, 05:32 PM   #4
dr3w
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^ aw boost cutting out and boost wont hold are two different things. let us know.

Check your gap as well if its to big you'll blow your spark out.
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Old 12-29-2009, 06:04 PM   #5
Matt Monson
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Quote:
Originally Posted by dr3w View Post
What do you mean by "wont hold boost" ? if it means what it actually means as in your boost is dropping then your spark plugs have zero to do with that.

But for reference a stock ej20g should be running PFR6G's, but alot of people use the BKR6E's
6's? I always use 7's in my boosted Subarus. I use 6's in my RS.
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Old 12-29-2009, 06:35 PM   #6
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arent the 7's just a colder spark? what benefits does one gain from that?
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Old 12-29-2009, 06:42 PM   #7
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Quote:
Originally Posted by Matt Monson View Post
6's? I always use 7's in my boosted Subarus. I use 6's in my RS.
You should not be using 7's is a stock boosted subaru. You go colder as you increase hp. NGK's general rule of thumb is 1step colder for every increase of 75whp.

The EJ20G Shop Manual says to use pfr6g's, I'm sure i have that written under my hood somewhere aswell. I personally currently use bkr6e's ill be using 7's when i hit up the dyno to increase boost.

Last edited by dr3w; 12-29-2009 at 07:29 PM.
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Old 12-29-2009, 06:43 PM   #8
dr3w
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Quote:
Originally Posted by curt View Post
arent the 7's just a colder spark? what benefits does one gain from that?
Nothing ^ see my post above.
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Old 12-29-2009, 07:28 PM   #9
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Quote:
Originally Posted by dr3w View Post
You go hotter as you increase hp. NGK's general rule of thumb is 1step colder for every increase of 75whp.
This looks very contradictory here, would you please clear it up?

and tell me which plugs I should be running in my stock EJ20G?
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Old 12-29-2009, 07:32 PM   #10
dr3w
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^oops corrected my little cold/hot inverted error.

Like i mentioned above in a stock EJ20G use:

NGK PFR6G (Platinum Plugs) <-What EJ20G Shop manual recommends

or

NGK BKR6E (V Power Plugs) <- Cheaper & Easier to Find.
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Old 12-30-2009, 10:46 AM   #11
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I have had good luck with both these plugs as long as gap is set between 0.028 and 0.031. I am running 550 injectors at 18psi with Rob's tune, TBE, Intake, and a couple other part. I was wondering about going to BKR7E's for a while. Not sure if it would make a diff though.
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Old 12-30-2009, 02:31 PM   #12
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With the colder plugs, the engine is less prone to det running more boost. Regarding brands: NGK all the way, engine seems to run worse on any other brand.
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Old 12-30-2009, 02:45 PM   #13
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Quote:
Originally Posted by sniper512 View Post
I have had good luck with both these plugs as long as gap is set between 0.028 and 0.031. I am running 550 injectors at 18psi with Rob's tune, TBE, Intake, and a couple other part. I was wondering about going to BKR7E's for a while. Not sure if it would make a diff though.
at 18psi+ i would run 7's
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Old 12-30-2009, 02:48 PM   #14
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Quote:
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With the colder plugs, the engine is less prone to det running more boost. Regarding brands: NGK all the way, engine seems to run worse on any other brand.
Yep colder is generally better but to cold and you run into plug fouling issues. If you dont need a colder plug you dont use them. Like in matts case running 7's on a stock ej20g is a little much.
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Old 12-30-2009, 02:57 PM   #15
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FWIW, I'm running NGK 7s with .024 gap, 17psi, DW 650s on 93 octane.
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Old 12-30-2009, 03:45 PM   #16
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Quote:
Originally Posted by dr3w View Post
You should not be using 7's is a stock boosted subaru. You go colder as you increase hp. NGK's general rule of thumb is 1step colder for every increase of 75whp.

The EJ20G Shop Manual says to use pfr6g's, I'm sure i have that written under my hood somewhere aswell. I personally currently use bkr6e's ill be using 7's when i hit up the dyno to increase boost.
If we had gas here that was equivalent in octane to what the cars were tuned for in Japan I would run 6's. I run 7's for greater knock resistance on our crap US gas. Cheap insurance in my book and I've never once had an issue with fouled plugs or any of the associated issues one can run into with going too cold on the plugs. 1 step colder isn't really all that much.
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Old 12-30-2009, 07:25 PM   #17
sniper512
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Well looks like I will have to try some out. Probably time to change them anyways. We have 94 here which doesn't seem to bad especially with the tune.
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Old 12-30-2009, 10:19 PM   #18
rob
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Quote:
Originally Posted by sniper512 View Post
Well looks like I will have to try some out. Probably time to change them anyways. We have 94 here which doesn't seem to bad especially with the tune.
I don't think it's necessary. The end result will be a drop in power and worse MPG IMHO.
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Old 12-30-2009, 10:20 PM   #19
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Quote:
Originally Posted by beaviscih View Post
FWIW, I'm running NGK 7s with .024 gap, 17psi, DW 650s on 93 octane.
Dang, why such a closed gap?
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Old 12-30-2009, 11:37 PM   #20
beaviscih
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Quote:
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Dang, why such a closed gap?
IIRC we started at 0.026 and had spark blow out at 15-16psi, so closed them a little and hit 17psi with no issues.
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Old 12-31-2009, 01:27 AM   #21
dr3w
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^ Ya i was wondering the same I'm currently running 16psi before i hit up the dyno and I'm running .028 gaps. Anything bigger and i was blowing out spark on old cracked coils, ill be doing the newer wrx coil swap before i drive my car again in the summer. The goal is to get the biggest gap possible without blowing it out.

Last edited by dr3w; 12-31-2009 at 02:52 AM.
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Old 12-31-2009, 02:49 AM   #22
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Quote:
Originally Posted by beaviscih View Post
IIRC we started at 0.026 and had spark blow out at 15-16psi, so closed them a little and hit 17psi with no issues.
Yowser. I am running around 0.031" @ 19psi with no spark issues (with the coil conversion of course )
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Old 12-31-2009, 07:10 AM   #23
beaviscih
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Quote:
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Yowser. I am running around 0.031" @ 19psi with no spark issues (with the coil conversion of course )
Well that's a data point I omitted; I have not done the coil mod.
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Old 12-31-2009, 08:46 AM   #24
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i run bkr7e @.28 in both my g and k

as matt says cheep insurance
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Old 12-31-2009, 10:29 AM   #25
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Is anyone running an R5671A-7 in their car?
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