Welcome to the North American Subaru Impreza Owners Club Saturday August 30, 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 General > General Community

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 04-12-2005, 12:01 PM   #1
SubyDuz
Scooby Specialist
 
Member#: 80432
Join Date: Jan 2005
Chapter/Region: RMIC
Location: SLC
Vehicle:
69 IchhateinAudi
Blutrot

Default Debate: Ver. 7 or Ver. 8 in an '03 WRX

So I just want some input on a swap I will be completing this spring/summer. I am thinking of putting in a Ver. 7 motor into my '03 WRX and was wondering if their is any more benefit to price in getting a Ver. 8. I will just be getting the LongBlock (no turbo or manifold or intercooler), going to be putting a larger turbo w/ external gate on it.

My main question here though is there any major differences that would make the Ver. 8 better than the Ver. 7 since they are both 2.0L's? Will also use a JDM ecu to take advantage of AVCS. Also will a Hydra allow for the AVCS to work properly or what ems will? Any feed back on this will be much appreciated.
* Registered users of the site do not see these ads.
SubyDuz is offline   Reply With Quote
Old 04-12-2005, 01:43 PM   #2
import111
Scooby Specialist
 
Member#: 24447
Join Date: Sep 2002
Chapter/Region: SWIC
Location: Tucson, Arizona
Vehicle:
2010 Evo GSR
GG

Default

I believe the JDM ver. 8 heads flow more than the JDM ver. 7 heads. I am not 100% sure though. Besides being newer, that is the only difference I can think of. I would get the ver. 8 longblock if it were me.

Ryan
import111 is offline   Reply With Quote
Old 04-12-2005, 03:12 PM   #3
Guru Imakuni
Scooby Specialist
 
Member#: 58773
Join Date: Apr 2004
Chapter/Region: NESIC
Location: Western MA
Default

I *think* there was a reason people like to get the v7. Something with the heads being forged perhaps.
Guru Imakuni is offline   Reply With Quote
Old 04-12-2005, 03:21 PM   #4
austenf740
Scooby Specialist
 
Member#: 21519
Join Date: Jul 2002
Location: Austin,TX
Vehicle:
02 WRB WRX
98 RS

Default

piston being forged i believe.
austenf740 is offline   Reply With Quote
Old 04-12-2005, 05:04 PM   #5
Guru Imakuni
Scooby Specialist
 
Member#: 58773
Join Date: Apr 2004
Chapter/Region: NESIC
Location: Western MA
Default

Yeah, that's what I meant. I've never actually heard anything making the v8 better than the v7.
Guru Imakuni is offline   Reply With Quote
Old 04-12-2005, 06:01 PM   #6
Capt Crunch
Scooby Guru
 
Member#: 10852
Join Date: Oct 2001
Chapter/Region: MAIC
Location: Cleveland / UMD College Park
Vehicle:
Then : JDM Ver 7 STi
Now : E46 M3 / MKVI GTI

Default

Version 8 has much better heads. More aggressive cams and better flowing ports.

It doesn't have forged pistons like the version 7, which arguably is more proven.

I'd get whichever you get the best deal on.
Capt Crunch is offline   Reply With Quote
Old 04-12-2005, 06:44 PM   #7
SubyDuz
Scooby Specialist
 
Member#: 80432
Join Date: Jan 2005
Chapter/Region: RMIC
Location: SLC
Vehicle:
69 IchhateinAudi
Blutrot

Default

Thanks for Help guys. I was probably going to go with the Ver. 7 simply because the longblock assembly is about $1,000 cheaper, and I was going to have the heads ported anyway. Having stronger pistons is important when trying to make reliable 400whp numbers.
SubyDuz is offline   Reply With Quote
Old 04-12-2005, 07:10 PM   #8
Guru Imakuni
Scooby Specialist
 
Member#: 58773
Join Date: Apr 2004
Chapter/Region: NESIC
Location: Western MA
Default

Quote:
Originally Posted by Capt Crunch
Version 8 has much better heads. More aggressive cams and better flowing ports.

It doesn't have forged pistons like the version 7, which arguably is more proven.

I'd get whichever you get the best deal on.
So they both put out the same numbers stock (I think), but is the v8 actually any better in stock form than the v7?

BTW, would one engine be better for getting bored out?
Guru Imakuni is offline   Reply With Quote
Old 04-13-2005, 12:16 PM   #9
SubyDuz
Scooby Specialist
 
Member#: 80432
Join Date: Jan 2005
Chapter/Region: RMIC
Location: SLC
Vehicle:
69 IchhateinAudi
Blutrot

Default

Anyone else know of any helpful differences when deciding between a Ver. 8 or Ver. 7?
SubyDuz is offline   Reply With Quote
Old 03-19-2006, 04:01 AM   #10
greysave
Scooby Specialist
 
Member#: 62395
Join Date: May 2004
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2005 STI
Black

Default

I know this is an old thread but I am starting to do research and I believe ver 8 heads are drive by wire.
greysave is offline   Reply With Quote
Old 03-19-2006, 03:32 PM   #11
SiNzz
Scooby Specialist
 
Member#: 92264
Join Date: Jul 2005
Chapter/Region: VIC
Location: Vancouver, BC
Default

Could somebody explain what exactly drive by wire is? I know it's probably a noob question, but I'm still learning.
SiNzz is offline   Reply With Quote
Old 03-19-2006, 03:36 PM   #12
DumbUglyDragon
Scooby Specialist
 
Member#: 61077
Join Date: May 2004
Chapter/Region: SCIC
Location: Who Cares?
Vehicle:
1993 WRX
Silver

Default

Drive by wire is a computer controlled throttle. Traditionally when you step on the accelerator there is a cable that is attached to the other end of the pedal that pulls open the throttle body. With drive by wire, when you step on the accelerator, it sends a singal to a computer which interpets it and sends a signal to a motor that opens the tb.
DumbUglyDragon is offline   Reply With Quote
Old 03-19-2006, 03:40 PM   #13
S.G.D
Scooby Specialist
 
Member#: 36448
Join Date: May 2003
Chapter/Region: VIC
Location: Vancouver
Default

Ver8 are twin scroll, i believe.
S.G.D is offline   Reply With Quote
Old 03-19-2006, 04:13 PM   #14
Wiscon_Mark
Scooby Guru
 
Member#: 94945
Join Date: Aug 2005
Chapter/Region: MWSOC
Location: Stevens Point, WI
Vehicle:
1995 Legacy OB 5MT
2003 Forester X 5MT

Default

I've heard that Ver8 is easier wiring.
Wiscon_Mark is offline   Reply With Quote
Old 03-19-2006, 10:28 PM   #15
Guru Imakuni
Scooby Specialist
 
Member#: 58773
Join Date: Apr 2004
Chapter/Region: NESIC
Location: Western MA
Default

Quote:
Originally Posted by DumbUglyDragon
Drive by wire is a computer controlled throttle. Traditionally when you step on the accelerator there is a cable that is attached to the other end of the pedal that pulls open the throttle body. With drive by wire, when you step on the accelerator, it sends a singal to a computer which interpets it and sends a signal to a motor that opens the tb.
Is it any more efficient?

What is the significance in twin scroll?
Guru Imakuni is offline   Reply With Quote
Old 03-24-2006, 10:02 PM   #16
Pakin
Scooby Specialist
 
Member#: 17315
Join Date: Apr 2002
Chapter/Region: International
Location: Date Line Denies F-22s
Vehicle:
MY95 Impreza 207C
MY05 Forester 257X

Default

Quote:
Originally Posted by Guru Imakuni
Is it any more efficient?

What is the significance in twin scroll?
Twin scroll turbos have two hotside inlets compared to a single one as on any USDM turbo Subaru. The inlets are paired with two cylinders each from a factory equal length exhaust manifold.

The result is better spool-up and response as well as overall flow catering to not only low end, but top end as well (contrary to common belief).

-paK +2
Pakin is offline   Reply With Quote
Old 03-24-2006, 10:39 PM   #17
subydude
Scooby Specialist
 
Member#: 80649
Join Date: Jan 2005
Chapter/Region: South East
Location: Columbia, SC
Vehicle:
2000 2.5 Auto-X RSTi
What's A Head Gasket?

Default

Wow, quite a bit of speculation in here

The Ver7 regular STi had good heads, vf30 turbo, forged bottom end capable of 8000 rpm. Ver7 Spec-c had bigger heads, more aggresive cam, and same turbo bottom end...also had a better tune from the factory

Ver8 regular STi had the same heads as the Ver7 Spec-c, gained twin scroll (vf37 on the regular STi), but lost the forged pistons...basically it is a Ver7 minus the forged pistons plus twin scroll turbo. All Ver8's use the same type of piston the USDM STi uses. The Ver8 Spec-c has even better heads (they are considered the second to best head (the Ver8 Spec-c type-RA being the best)), a vf36 turbo, and a better tune from the factory.

People like to debate about about which is better and it usually comes down to: do you want the more bullet proof bottom end of the Ver7, or do you want the quicker spool of the Ver8. People have made over 500whp on the Ver8's stock bottom end, so it is possible to make big power out of them, but they will not stand up to knock nearly as well as the Ver7's.

Usually the one engine that is wanted by all is the Ver7 Spec-c becuase it had the same heads as the base Ver8 STi, but still had the forged bottom end. That and with AVCS it is able to spool the vf30 relatively quick.

As for wiring, both will be the same. They both wire up the same, both require an AVCS layover harness to activate the AVCS on our cars, but other than that not much else is required as long as you have an 02+ car. It's the 01 and down cars that are a pain to wire.

Last edited by subydude; 03-24-2006 at 11:40 PM.
subydude is offline   Reply With Quote
Old 03-24-2006, 10:42 PM   #18
SpDRcrWrex
Scooby Newbie
 
Member#: 91350
Join Date: Jul 2005
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
2005 Impreza WRX
World Rally Blue

Default

so essentially you can only use either a v7 or head block
but will need a v7 head/valvetrain to fit into 02-05 wrx?

just wondering, i was about to do the same myself and was unsure how
to get the easiest fitment (05 wrx is not drive by wire)
SpDRcrWrex is offline   Reply With Quote
Old 03-24-2006, 10:48 PM   #19
Uncle Scotty
Scooby Guru
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK Houston
we have an Uncle

Default

...y not v7 shortblock w/v8 heads????
Uncle Scotty is offline   Reply With Quote
Old 03-24-2006, 11:39 PM   #20
SpDRcrWrex
Scooby Newbie
 
Member#: 91350
Join Date: Jul 2005
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
2005 Impreza WRX
World Rally Blue

Default

obviously with the right parts you can wire a car for drive by wire
i assume that means swapping computer, looms, throttle, heads etc
pertty darned expensive.
SpDRcrWrex is offline   Reply With Quote
Old 03-24-2006, 11:45 PM   #21
subydude
Scooby Specialist
 
Member#: 80649
Join Date: Jan 2005
Chapter/Region: South East
Location: Columbia, SC
Vehicle:
2000 2.5 Auto-X RSTi
What's A Head Gasket?

Default

Quote:
Originally Posted by SpDRcrWrex
so essentially you can only use either a v7 or head block
but will need a v7 head/valvetrain to fit into 02-05 wrx?

just wondering, i was about to do the same myself and was unsure how
to get the easiest fitment (05 wrx is not drive by wire)
You can mate just about all EJ short blocks with any EJ head.

Not really sure what you're asking there...if you're talking about putting an engine into an 05 then you're going to need the ecu, and intake parts. But the biggest thing is if you're swaping the new engine will come with it's associated engine harness and that will have all you need right there.

There really isn't a point to putting a Ver7/8 head on a wrx short block. By the time you got done with all the work it would have been cheaper to get a full swap and just got from there.
subydude is offline   Reply With Quote
Old 03-24-2006, 11:48 PM   #22
subydude
Scooby Specialist
 
Member#: 80649
Join Date: Jan 2005
Chapter/Region: South East
Location: Columbia, SC
Vehicle:
2000 2.5 Auto-X RSTi
What's A Head Gasket?

Default

Quote:
Originally Posted by Uncle Scotty
...y not v7 shortblock w/v8 heads????
This is something that a lot of people talk about...or a reworked USDM STi shortblock with JDM heads (Ver7 big port, Ver8). The biggest issue with putting Ver8 heads on a Ver7 short block is most people don't want to split the block. They like the OEM reliability, and it's a lot easier to buy all the parts, or a complete swap, all in one place rather than sourcing the parts/ getting the correct ecu for the heads. As for JDM heads on a USDM STi that's probably the wet dream setup of most people here. Just takes some deep pockets and a good deal of knowledge about engine building.
subydude 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
WTT: WRX 05 black seats for ver 7 or ver 8 sti seats and door cards Crazy650 Private 'Wanted' Classifieds 1 01-31-2008 04:29 PM
Ver. 7 or 8 swap into 02-03 WRX questions..... VtecGSR95 Subaru Conversions 18 09-21-2006 10:45 PM
jdm ver 7 or ver 8? subietech420 Electrical & Lighting 0 09-20-2006 08:27 PM
Ver.7 or Ver.8 STi Struts SoLo OnE Private 'Wanted' Classifieds 1 01-22-2004 09:22 AM
STI ver 7 or 8 complete engine MACHWRX Private 'Wanted' Classifieds 8 07-24-2003 06:17 PM


All times are GMT -4. The time now is 06:38 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.