Welcome to the North American Subaru Impreza Owners Club Thursday July 31, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.0L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 05-14-2009, 02:26 PM   #401
Clark Turner
NASIOC Vendor
 
Member#: 178047
Join Date: Apr 2008
Chapter/Region: SWIC
Location: AZ
Vehicle:
02 WRX STI Spec C
Black

Default

If you want a wider power band use the 3071. It works well on the 2.0 motor. Use the .82 turbine housing.

Dont raise the compression of the 207 engine. That is not going to help. I have attempted this myself. The piston and quench area are great on the 207 engine and that is one reason why they make so much power.

The 35r will come on about 5000 rpm. Not a bad combination. But the problem you will face with the 207 engine is the low lift cam shafts. If you are going to keep the stock heads I would do the 3076 with 4 inch cover and .82.

Clark
* Registered users of the site do not see these ads.
Clark Turner is offline   Reply With Quote
Old 05-14-2009, 02:40 PM   #402
iNfEk
Scooby Specialist
 
Member#: 21339
Join Date: Jul 2002
Chapter/Region: HIIC
Location: Kapolei, HI
Vehicle:
2002 LHD STI V7 6MT
12.9@103MPH EJ205 4EAT

Default

I love my 3071 on my 207

I just wish it spooled faster
iNfEk is offline   Reply With Quote
Old 05-14-2009, 03:25 PM   #403
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

Quote:
Originally Posted by Clark Turner View Post
If you want a wider power band use the 3071. It works well on the 2.0 motor. Use the .82 turbine housing.

Dont raise the compression of the 207 engine. That is not going to help. I have attempted this myself. The piston and quench area are great on the 207 engine and that is one reason why they make so much power.
Clark
who makes a stock replacement piston for the v8 207? or what would numbers do i need to get some made?
seanathanq83 is offline   Reply With Quote
Old 05-14-2009, 03:46 PM   #404
dug-e-fresh
Scooby Guru
 
Member#: 4568
Join Date: Mar 2001
Location: 603 whp / EJ207
Vehicle:
10.7 @ 136, '02 WRX
??.? @ ???, '09 spec.B

Default

Quote:
Originally Posted by Clark Turner View Post
If the car is street weight, You will need 550whp for the 130-135 traps. So the 30R will likely not get you there. Mine never did. Most 30Rs are going to be in the 120 to 125 range TOPS.

You will need the 35R .82. Dont use the 1.06 housing on the 2.0 engine.
The best turbo for this motor in my opinion is the 3076 with .82 and 4 inch port shroud cover.

I think you need to be realistic. Its a 2.0 engine. Even with the 30R you are not going to have any significant power below 4500 rpm.

Clark
I agree... the 1.06 is a no go on the 2.0. I run the GT3582R with a 0.82 a/r housing and begin rolling out in the 4200-4700 rpm range. I was seeing peak pump gas boost of 27 psi at 4600-4700 in 4th gear pulls.

As for stock replacement pistons... who doesn't? Anyone that lists a EJ205 piston will work with an EJ207 motor.

def
dug-e-fresh is offline   Reply With Quote
Old 05-14-2009, 04:17 PM   #405
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

Quote:
Originally Posted by dug-e-fresh View Post
As for stock replacement pistons... who doesn't? Anyone that lists a EJ205 piston will work with an EJ207 motor.

def
my 207 pistons look completly different than a 205, my 207 are flat top, which has alot to do with the quench pad
seanathanq83 is offline   Reply With Quote
Old 05-14-2009, 06:31 PM   #406
dug-e-fresh
Scooby Guru
 
Member#: 4568
Join Date: Mar 2001
Location: 603 whp / EJ207
Vehicle:
10.7 @ 136, '02 WRX
??.? @ ???, '09 spec.B

Default

Quote:
Originally Posted by seanathanq83 View Post
my 207 pistons look completly different than a 205, my 207 are flat top, which has alot to do with the quench pad
You mean an exact reproduction? You'll never find that...

If you want something better than the V8's and be as "similar" as possible in design, I have a set V7 forged pistons laying around. Low miles and look great.

def
dug-e-fresh is offline   Reply With Quote
Old 05-14-2009, 06:35 PM   #407
Hyper
Scooby Guru
 
Member#: 15822
Join Date: Feb 2002
Location: MOCKBA
Vehicle:
1999 WRB GM6
2.12cc V9 Type RA

Default

there's nothing really special about oem v8 pistons

for instance, I was considering cosworth pistons for my rebuild, but decided to go with coated custom diamond pistons
Hyper is offline   Reply With Quote
Old 05-14-2009, 06:43 PM   #408
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

well i know what i have looked, and v8 207 are flat top with valve reliefs, the 205 have a square relief cut into them, that has to make quite a difference is quench area, and compression ratio
seanathanq83 is offline   Reply With Quote
Old 05-14-2009, 06:44 PM   #409
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

Quote:
Originally Posted by dug-e-fresh View Post
You mean an exact reproduction? You'll never find that...

If you want something better than the V8's and be as "similar" as possible in design, I have a set V7 forged pistons laying around. Low miles and look great.

def
well the v7 are not flat top either
seanathanq83 is offline   Reply With Quote
Old 05-16-2009, 09:19 AM   #410
dug-e-fresh
Scooby Guru
 
Member#: 4568
Join Date: Mar 2001
Location: 603 whp / EJ207
Vehicle:
10.7 @ 136, '02 WRX
??.? @ ???, '09 spec.B

Default

Quote:
Originally Posted by seanathanq83 View Post
well the v7 are not flat top either
The v7 and v8 pistons I have are very similar... neither are 100% flat and both are valve reliefed.

def
dug-e-fresh is offline   Reply With Quote
Old 05-16-2009, 12:33 PM   #411
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

my V8 is completly flat, with 4 small valve reliefs? i hed possibilities that it could possibly mean its a spec C motor, but i can take pictures and post if somone would like
seanathanq83 is offline   Reply With Quote
Old 05-16-2009, 01:41 PM   #412
dug-e-fresh
Scooby Guru
 
Member#: 4568
Join Date: Mar 2001
Location: 603 whp / EJ207
Vehicle:
10.7 @ 136, '02 WRX
??.? @ ???, '09 spec.B

Default

Quote:
Originally Posted by seanathanq83 View Post
my V8 is completly flat, with 4 small valve reliefs? i hed possibilities that it could possibly mean its a spec C motor, but i can take pictures and post if somone would like
V9 perhaps?

def
dug-e-fresh is offline   Reply With Quote
Old 05-16-2009, 03:13 PM   #413
OppositeLock
Scooby Specialist
 
Member#: 54060
Join Date: Feb 2004
Chapter/Region: Tri-State
Location: N Jersey
Vehicle:
Now: v8 207/v6 5mt
Then: JRTune fastest td04

Default

According to the thread linked below, V8's and V9's had the same pistons regardless of model. If it is accurate, the Spec-C's from MY03 on didn't have different internals then any other model STi.
http://forums.nasioc.com/forums/showthread.php?t=823167
OppositeLock is offline   Reply With Quote
Old 05-16-2009, 07:27 PM   #414
Hyper
Scooby Guru
 
Member#: 15822
Join Date: Feb 2002
Location: MOCKBA
Vehicle:
1999 WRB GM6
2.12cc V9 Type RA

Default

my V9 spec c pistons have valve reliefs

can make pics if needed
Hyper is offline   Reply With Quote
Old 05-17-2009, 12:57 AM   #415
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

yea the have valve reliefs, but i went and looked again, and they have maybe 1/16-3/32 curve down, so i guess not 100% flat, but way more than a v7 or any usdm piston
seanathanq83 is offline   Reply With Quote
Old 05-22-2009, 08:24 AM   #416
team_imprezzed
Scooby Newbie
 
Member#: 142847
Join Date: Mar 2007
Chapter/Region: South East
Location: Clarksville Tennessee
Vehicle:
2005 WRX w/ v8 EJ207
Black

Default

can i use the cobb stage two transmission package that i bought for my 05 wrx on my v8 207 with sti transmission?
team_imprezzed is offline   Reply With Quote
Old 05-22-2009, 10:20 PM   #417
theghostwrx
Scooby Newbie
 
Member#: 133824
Join Date: Dec 2006
Chapter/Region: South East
Location: south east
Vehicle:
04 wrx v7 jdm sti
white

Default

i have a 04 wrx with a v7 sti spec-c ra motor with the 5spd man ra gears limited slip front and rear i made 340/325 at 19 psi on good 93 pump. i have a big 16g evo III turbo with 565 sti pinks. my question is i would like to get close to 400/350 how would i go about doing that all advice would be awesome thanks
theghostwrx is offline   Reply With Quote
Old 05-22-2009, 11:08 PM   #418
dug-e-fresh
Scooby Guru
 
Member#: 4568
Join Date: Mar 2001
Location: 603 whp / EJ207
Vehicle:
10.7 @ 136, '02 WRX
??.? @ ???, '09 spec.B

Default

Quote:
Originally Posted by theghostwrx View Post
i have a 04 wrx with a v7 sti spec-c ra motor with the 5spd man ra gears limited slip front and rear i made 340/325 at 19 psi on good 93 pump. i have a big 16g evo III turbo with 565 sti pinks. my question is i would like to get close to 400/350 how would i go about doing that all advice would be awesome thanks
Bigger turbo, bigger injectors (wrx or sti modded would be plenty) and at least a single walbro 255.

def
dug-e-fresh is offline   Reply With Quote
Old 06-03-2009, 03:32 AM   #419
awdboostftw
Scooby Specialist
 
Member#: 178656
Join Date: Apr 2008
Chapter/Region: MWSOC
Location: O-H-I-O
Vehicle:
2004 wrb
wrx wagon

Default

i'm thinking of trading my turbo s2000 for a bugeye with the v8 207 swap and was wondering if this sounds like a good setup with compression ration/flow, etc. I read through most of this thread and it seems pretty stout as per what people have been saying. what kind of power do the v8 blocks hold with the non-forged internals like the v7's?

ej207 ver8 jdm sti block
05 2.5 sti heads

gt35r .82 a/r
awdboostftw is offline   Reply With Quote
Old 06-03-2009, 04:25 AM   #420
Hyper
Scooby Guru
 
Member#: 15822
Join Date: Feb 2002
Location: MOCKBA
Vehicle:
1999 WRB GM6
2.12cc V9 Type RA

Default

EJ207 + USDM STI heads = fail, paired with a turbo of that size
Hyper is offline   Reply With Quote
Old 06-03-2009, 12:44 PM   #421
awdboostftw
Scooby Specialist
 
Member#: 178656
Join Date: Apr 2008
Chapter/Region: MWSOC
Location: O-H-I-O
Vehicle:
2004 wrb
wrx wagon

Default

Quote:
Originally Posted by Hyper View Post
EJ207 + USDM STI heads = fail, paired with a turbo of that size
why is this?
awdboostftw is offline   Reply With Quote
Old 06-03-2009, 01:05 PM   #422
Clark Turner
NASIOC Vendor
 
Member#: 178047
Join Date: Apr 2008
Chapter/Region: SWIC
Location: AZ
Vehicle:
02 WRX STI Spec C
Black

Default

PASS. Thats a horrible engine combination. The 2.5 heads have a large 57CC combustion chamber and small head ports. Also, the AVCS wont work as it cant be run by the older bugeye JDM ECU. The motor probably has compression in the 7 to 1 range.

You need the JDM 2.0 heads, THen you get big ports and 49CC combustion chambers.

Clark
Clark Turner is offline   Reply With Quote
Old 06-03-2009, 01:20 PM   #423
awdboostftw
Scooby Specialist
 
Member#: 178656
Join Date: Apr 2008
Chapter/Region: MWSOC
Location: O-H-I-O
Vehicle:
2004 wrb
wrx wagon

Default

thanks for the responses so it's not optimal for flow... would the v7 or v8 heads be better? what kind of power can these motors handle stock?
awdboostftw is offline   Reply With Quote
Old 06-03-2009, 01:25 PM   #424
awdboostftw
Scooby Specialist
 
Member#: 178656
Join Date: Apr 2008
Chapter/Region: MWSOC
Location: O-H-I-O
Vehicle:
2004 wrb
wrx wagon

Default

Also, would it be such a bad combo that it would be a bad idea to get it, run it for a little and change the heads to the right ones? What I mean is: is it a bad idea because it won't flow well and will not be running at full potential, or is it a bad idea because it's dangerous? The car I'm looking at trading for is very highly modified and one reason I'm hesitant is because I don't like buying other people's built cars and wanted to be able to do more things to make it mine and if I could safely run the car with this setup and then change it down the road in a few months, that may actually be a positive haha.

So, long story short: Is it a bad idea because it's not the optimal setup and won't flow as well as it could with different heads or because it's dangerous?
awdboostftw is offline   Reply With Quote
Old 06-03-2009, 01:32 PM   #425
Clark Turner
NASIOC Vendor
 
Member#: 178047
Join Date: Apr 2008
Chapter/Region: SWIC
Location: AZ
Vehicle:
02 WRX STI Spec C
Black

Default

In real world terms... About 450 at all four wheels. If you put it on a small roller dynojet with I have made 500 to 530whp before. You need the matching JDM 2.0 heads which are very expensive.

Clark
Clark Turner is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
ej207 owner wants opinions adbramsay Factory 2.0L Turbo Powertrain 2 02-26-2011 07:29 PM
Ej207 V6 AndrewFD3 Factory 2.0L Turbo Powertrain 10 06-03-2010 04:53 PM
JDM Sti EJ207 V9 crank 75mm or billet crank (K1, Manley) VENDORS ??? L'frise Private 'Wanted' Classifieds 7 06-03-2010 09:24 AM
08 ej207 JDM dual AVCS heads on a built v7 ej207 icev7 Built Motor Discussion 17 02-21-2010 03:21 PM
Ver 8 EJ207 Owners Check In spoolinsuby Factory 2.0L Turbo Powertrain 21 10-17-2005 01:56 AM


All times are GMT -4. The time now is 02:29 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.