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 Technical > Subaru Conversions

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 02-18-2008, 02:10 PM   #1
CUbaru07
Scooby Newbie
 
Member#: 159830
Join Date: Sep 2007
Chapter/Region: RMIC
Location: Boulder, CO
Vehicle:
2007 Impreza 2.5i
Obsidian Black Pearl

Question WRX/STI engine swap??!?!??!

Ok so i am weighing my options on how to get more power out of my 2.5i...
Until recently i was just thinking about intake/exhaust upgrade on my 2.5i but that would give me like 30hp at best... but i started to look around and i found a complete turbo kit for a NA impreza (turbo, intercooler, up pipe, cat...) for $4,000

http://yhst-49187380673845.stores.ya...vocotukit.html

BUT then i ran into this...

http://www.gruppe-s.com/Subaru/UsedEngines.htm

"Complete" Engines with low miles, for $3,000

I guess what i want to ask is if anyone out there has done a NA to turbo engine swap, and if wrx/sti engine swap is a better way to go than to buy a turbo kit for a NA engine, and if so how easy would it be to swap the engine and would i need any major upgrades to anything else while swapping the engines?


Or if i go the part upgrade way, could i get parts from subaru that would bolt on to my engine (say a replacement intercooler/turbo and so on.. for a wrx, what would it take to put it on my engine?).


Any ideas will help, thanks!
* Registered users of the site do not see these ads.
CUbaru07 is offline   Reply With Quote
Old 02-18-2008, 02:33 PM   #2
nhat
Scooby Guru
 
Member#: 140163
Join Date: Feb 2007
Chapter/Region: MAIC
Location: 3MI Racing
Vehicle:
03 STi
hellaflunctional

Default

go with the swap. adding a turbo to the na ej25 can be done but it's not a good idea. the engine runs 10:1 cr stock and adding boost just melts the pistons.

you're far better off getting the swap. talk to suba performance in denver. my gf just had her swap done there in her 05rs. they know what they're doing. if you want to see it, shoot me a pm and we can meet up sometime this week so you can take a look.
nhat is offline   Reply With Quote
Old 02-19-2008, 10:05 PM   #3
2.5iSTI
Scooby Specialist
 
Member#: 162585
Join Date: Oct 2007
Chapter/Region: MWSOC
Location: Columbus, OH
Vehicle:
2007 03 Evo w/2.3

Default

I have a 2007 2.5i as well. I have already started my swap. As of now I am riding 6-speed. The motor will be swapped in about a month. It is alot more than a "$3000 motor". You have much...much more to think about. Engine management being one. The 2.5i ecu luckily can be tuned open source, but it is unknown to me if it can be tuned for boost. I went with getting the entire engine and under dash harness for a 2004 STI to avoid the immobilizer in the 05+. After you tackle that issue, then you have to move to the driveline. I don't think anyone out there has tested the absolute strength of the 2.5i tranny, but I don't imagine it is not even up to WRX spec. Once again I stepped up and went with the 6 speed. Those I think are the big hurdles, but I am sure I am going to run into more as I go through the swap. I will be doing some type of video/write up on everything I do with the motor swap.
2.5iSTI is offline   Reply With Quote
Old 02-20-2008, 04:48 PM   #4
nhat
Scooby Guru
 
Member#: 140163
Join Date: Feb 2007
Chapter/Region: MAIC
Location: 3MI Racing
Vehicle:
03 STi
hellaflunctional

Default

my gf's rs tranny is holding up fine with the 06 ej255 she had swapped into it.

i would highly suggest buying a motor with the ecu and associated wiring.
nhat is offline   Reply With Quote
Old 02-20-2008, 10:05 PM   #5
CUbaru07
Scooby Newbie
 
Member#: 159830
Join Date: Sep 2007
Chapter/Region: RMIC
Location: Boulder, CO
Vehicle:
2007 Impreza 2.5i
Obsidian Black Pearl

Default

nhat, did suba performance provide the engine or did you have to find it? and how much did it cost to do all this? Did they recommend a tranny upgrade? Or a suspension upgrades?



2.5iSTI, the 3000 would be just for the engine, no intercooler, headers all that good stuff so yes it would be several thousand more just on engine parts and tranny, but nhat says the 2.5rs tranny holds up fine.
CUbaru07 is offline   Reply With Quote
Old 02-20-2008, 10:23 PM   #6
Davenow
Scooby Guru
 
Member#: 23676
Join Date: Aug 2002
Chapter/Region: NESIC
Location: de_dust and Orgrimar
Vehicle:
.

Default

Cheaper to buy a used STI, and you get so much more than what just the engine and tranny gives you.

Lets put it this way, you are looking at a 6 to 10 THOUSAND dollar swap to do the motor and tranny and do it right. You can buy a used 04 or 05 STI for low to mid 20k range. Do you really want to have 35K invested in your car? Which will then have squat for resale value and zero warranty? Even if you only do the motor, you are looking at minimum 4k if not 5k, and again, zero warranty and no resale value.

Its just not a spart way to spend your money. If you have that kind of money available to you, you are FAR better off trading your car in and using it as a down payment on a WRX or used STI
Davenow is offline   Reply With Quote
Old 02-21-2008, 08:25 AM   #7
2.5iSTI
Scooby Specialist
 
Member#: 162585
Join Date: Oct 2007
Chapter/Region: MWSOC
Location: Columbus, OH
Vehicle:
2007 03 Evo w/2.3

Default

^^^He is soooo right, but my situation is a little different. My motor came from me trading off a civic hatch shell. My swap is still not cheap by far simply becasue I decided to do everything at one. Everything being FMIC, fuel pump, alky injection, vf43, tbe, every bushing available,guages, ect. When my car is done, I will not have to touch it for atleast a year.
2.5iSTI 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
Need an WRX/STI engine swap. codemunky Bay Area Impreza Club Forum -- BAIC 1 09-16-2006 02:44 AM
STi engine swap in a 2.5 or WRX? Pastapuck Newbies & FAQs 6 11-15-2005 09:44 PM
wrx to sti engine swap Smoke Show Subaru Conversions 9 09-24-2005 12:29 AM
Hmmm...mostly stock STi, modded WRX or engine swapped GC? DoinkMobb General Community 25 04-07-2005 02:15 PM
wrx/sti engine swap to 1999 impreza L (2.2 MT) Qaveboy Factory 2.0L Turbo Powertrain 1 01-10-2003 06:10 PM


All times are GMT -4. The time now is 11:50 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.