Welcome to the North American Subaru Impreza Owners Club Sunday September 24, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Normally Aspirated 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. 
Thread Tools Display Modes
Old 12-22-2001, 01:10 PM   #1
Scooby Specialist
Member#: 8407
Join Date: Jul 2001
Chapter/Region: Tri-State
Location: gabage island, NEW YORK
Thumbs up What is the different 2.5L and 2.5RS

Can you guys tell me what is the different between these two engine's! 2.5L and 2.5RS?
cause i'm getting the 2.5L twin cam engine from a 98 legacy 20K
and do the swap onto my 1.8 L model impreza 5 speed AWD...
what else do i need the guy sell me the engine is include the Harness and ecu plus altnator and compressor for A/C and enigne mount ( you think the engine mount for these engine will fit better then what i have on my 1.8? or i need to upgrade it!
all for these comes with paper for 450 flat. you think is a good deal!
What else do i need? you think i'm all set!
and what is the shipping will cost from New york!
* Registered users of the site do not see these ads.
SONofSAM is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 12-22-2001, 01:57 PM   #2
Scooby Specialist
Member#: 1997
Join Date: Jul 2000
Chapter/Region: MWSOC
Location: Des Plaines, IL
2006 Acura TL 6spd
STMGM6 alumni


Make sure you get the intake tract upto the MAF. Dont want to have to buy one. Ummmm you might need the crossmember. Dont know if there 1.8l one will support the ej25 well?
Midwayman is offline   Reply With Quote
Old 12-23-2001, 08:39 PM   #3
Scooby Specialist
Member#: 1908
Join Date: Jul 2000
Chapter/Region: MAIC
Location: HR

well the twin cam 2.5 legacy sounds like the same as a 98 rs which came with a twin cam 2.5 liter. That's the only year they had twin cams. Check to see if it's a phase 1 or phase 2 block cuz i've heard that the phase 2's are better... reason why they are better, i have no clue

rbehny is offline   Reply With Quote
Old 12-24-2001, 12:28 AM   #4
Patrick Olsen
NASIOC Supporter
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
1997 Legacy 2.5GT
1996 Impreza coupe


Ummmm, the engine in the 2.5RS is a 2.5L engine. The "L" stands for "liters", it's not a model designation.

As pointed out already, the '98 Legacy 2.5GT's 2.5L engine is the same as the '98 Impreza 2.5RS' 2.5L engine. The MAF sensor might be different, but that doesn't really matter. Definitely get everything on the intake side, all the way to the filter box, as that stuff is pretty expensive. Also make sure you get at least the exhaust header, and probably the cat pipe, too. I'm sure the header is different than on the 1.8L, and there's a good chance the cat pipe is also. Actually, it would probably be good to get the entire exhaust, as I imagine the 1.8L's exhaust is pretty small and will choke off the 2.5L a bit.

If he's giving you the 2.5L's engine mounts, then use them. You could also look into getting STi engine mounts, which would set you back about $100-110 I think ($165 if you get the tranny mount too).

Pat Olsen
'97 Legacy 2.5GT sedan

PS - You slept through English class in high school, didn't you, SoS?
Patrick Olsen is offline   Reply With Quote

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
what is the difference with revisions and versions with the UTEC ? billy boi Engine Management & Tuning 3 01-27-2005 01:06 PM
what is the difference between saden and wagon? motr Vancouver Impreza Club Forum -- VIC 8 10-29-2002 07:04 PM
What is the difference between forged and cast wheels? disc108 Brakes, Steering & Suspension 12 10-10-2001 02:47 AM
What is the difference between 18mm and 20mm WRXwannbe Brakes, Steering & Suspension 15 10-27-2000 02:59 PM
what is the difference between V4 and V5 wings Cata Vancouver Impreza Club Forum -- VIC 1 09-28-2000 08:47 PM

All times are GMT -4. The time now is 03:57 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.