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Old 01-13-2010, 08:51 PM   #1
hustleshark206
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Default STI Coils on Phase I Heads

Does anyone know if STI coil over plug coils will fit Phase I DOHC cylinder heads? I simply couldn't tell if the boot was engauging the plug or not. It is awful close. I have heard that the STI and WRX COP coils might differ slightly in length but I am looking for confirmation one way or another.

STI coils have built in ignitors correct?

Thanks guys
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Old 01-13-2010, 09:32 PM   #2
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Which STI? Which phase 1 heads?
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Old 01-13-2010, 10:46 PM   #3
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Post this is the stickyed coil conversion thread in the pre 2002 section of forum.

But if i remember right yes you can.
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Old 01-13-2010, 10:51 PM   #4
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Quote:
Originally Posted by dr3w View Post
But if i remember right yes you can.
So I could take the coils from a 98 STI and put them on some Legacy Turbo heads?
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Old 01-13-2010, 10:57 PM   #5
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Quote:
Originally Posted by ciper View Post
So I could take the coils from a 98 STI and put them on some Legacy Turbo heads?
Good luck getting them to fire correctly tho
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Old 01-14-2010, 01:11 AM   #6
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Good luck getting them to fire correctly tho
Igniter bypass mod
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Old 01-14-2010, 01:44 AM   #7
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wouldnt a 98 STI be a EJ20K with a single coil pack?

if he is talking about a USDM trubo legacy this may work. but not sure. but deff. not the same as the coil mod for the phase I DOHC and USDM STI coil packs...

-=Suberdave=-
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Old 01-14-2010, 02:44 AM   #8
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Thanks guys. I am talking about USDM STI coils from a 2005. The cylinder Heads are DOHC from a 98 2.5RS. I am going stand alone with a haltech platinum sport 1000. Haltech told me I could wire them straight to the ECU no problems but then again they are Aussy.
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Old 01-14-2010, 03:00 AM   #9
ciper
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I actually knew you meant EJ257 style heads and EJ25D heads but decided to take a big dump on your thread for being unclear

EJ25D heads are actually the same as EJ20G heads. It would probably helped you more if you searched about EJ20G heads with EJ257 coils.

edit: Ok I am feeling generous - this thread may help you http://forums.nasioc.com/forums/show....php?t=1192028

Last edited by ciper; 01-14-2010 at 03:07 AM.
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Old 01-14-2010, 03:07 AM   #10
hustleshark206
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Ok I will try searching for that. Or you could just tell me since I don't know **** and you are the man.
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Old 01-14-2010, 12:16 PM   #11
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HAHA thanks Ciper.
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Old 01-14-2010, 03:04 PM   #12
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One more quick question. Ciper told me EJ25D and EJ20G heads are the same thing. Is there any difference in the spark plugs used? I am sure the gap will be different one being N/A and one turbo but is the plug itself different?
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Old 01-14-2010, 03:09 PM   #13
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Heat range will be different. EJ25D=BKR5ES EJ20G=BKR6ES (factory)
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Old 01-14-2010, 03:48 PM   #14
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Perfect. Thanks guys!
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Old 01-14-2010, 04:27 PM   #15
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Quote:
Originally Posted by DSM_Outback View Post
Heat range will be different. EJ25D=BKR5ES EJ20G=BKR6ES (factory)
Factory oem for ej20g is actually pfr6g's but brk6e's also work.
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Old 01-14-2010, 08:13 PM   #16
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After reading about cylinder heads all day it seems that the EJ20G heads are the same as MY96 EJ25D heads. MY98 EJ25D heads are more like EJ20K or EJ20H. All these numbers are getting confusing LOL! All I want to know is will the STI coils engauge the spark plug in MY98 EJ25 DOHC heads. Everything I have read suggests they will but when I test fitted them I couln't tell. Could the EJ20 spark plug be physically longer I wonder?


Fuji Where you at bro?
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Old 01-14-2010, 08:36 PM   #17
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wrx coil packs should fit but the sti ones are a different length. You can pull the ends off and swap them though.
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Old 01-14-2010, 11:29 PM   #18
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Quote:
Originally Posted by dr3w View Post
Factory oem for ej20g is actually pfr6g's but brk6e's also work.
Platinum sucks.
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Old 01-15-2010, 12:42 AM   #19
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Quote:
Originally Posted by jamal View Post
wrx coil packs should fit but the sti ones are a different length. You can pull the ends off and swap them though.
i have heard this many times. however i have been using STI coil packs on my EJ20G for 12K and they seem to work just fine...

does someone have a pic of an STI coilpack next to a WRX coilpack?

-=Suberdave=-
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Old 01-15-2010, 11:27 AM   #20
hustleshark206
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^ yeah this would really help. I have read that they are different lengths but then everyone says they are interchangable. I don't get it.....
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Old 01-15-2010, 08:07 PM   #21
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I've seen my02 WRX coils next to my05 STI coils and they looked the same to me other than the colors. I didn't specifically measure them though.

This thread originally peaked my interest because I plan to use coil on plugs with my DOHC NA engine which has the EJ25D heads.
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Old 01-16-2010, 04:05 PM   #22
hustleshark206
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Quote:
Originally Posted by ciper View Post
I've seen my02 WRX coils next to my05 STI coils and they looked the same to me other than the colors. I didn't specifically measure them though.

This thread originally peaked my interest because I plan to use coil on plugs with my DOHC NA engine which has the EJ25D heads.
Bmxpunk confirmed that they will work because he is currently using EJ22t block MY98 DOHC heads and STI coils. I am trying to find out what plugs he is using.
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Old 01-17-2010, 01:26 AM   #23
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Quote:
Originally Posted by hustleshark206 View Post
Bmxpunk confirmed that they will work because he is currently using EJ22t block MY98 DOHC heads and STI coils. I am trying to find out what plugs he is using.
NGK Bkr6es (vf37turbo, 14psi, 8.5:1CR) I will switch to 7's someday when I make more power
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Old 01-18-2010, 03:41 PM   #24
hustleshark206
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Thanks BMX! I will try those plugs and see if that helps
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Old 01-28-2010, 12:45 AM   #25
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Quote:
Originally Posted by suberdave View Post
i have heard this many times. however i have been using STI coil packs on my EJ20G for 12K and they seem to work just fine...

does someone have a pic of an STI coilpack next to a WRX coilpack?

-=Suberdave=-
been awhile but I grabbed two coilpacks the other day and took a picture:



sti coilpack is the short one.
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