Welcome to the North American Subaru Impreza Owners Club Wednesday September 17, 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 > 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.
Reply
 
Thread Tools Display Modes
Old 07-23-2006, 05:37 AM   #1
qtr_wrx
Scooby Specialist
 
Member#: 109567
Join Date: Mar 2006
Location: Qatar
Default For those how have an idea about the JDM EJ25

I did a long search and I did not come up with anything usefull for myself
Okay, I have a SOHC EJ20 and I'm looking for more power.....
for the last 6 months I was looking for any EJ25 engine to swap it in my car, but those engine are extremly rare in my area.
luckyly I found a JDM EJ25 shortblock and I'm going to buy it but first I need to know some info cuz I will use my stock ecu which is desigend for SOHC engine.

1- that JDM EJ25 shortblock was DOHC (( off 98 legacy )) and I want to use this JDM EJ25 along with my EJ20 SOHC heads, and intake body, is this okay? cuz I will put TWE SOHC stage II cams soon + PP6
2- with the JDM EJ25 shortblock + SOHC + TWE stage II cams, how much power will I get if I go catless
3- what is the recommended revlimit ?


please help me, I was looking for this engine for the last 6 months, and now all I need some infos before I buy it
* Registered users of the site do not see these ads.
qtr_wrx is offline   Reply With Quote
Old 07-23-2006, 12:30 PM   #2
ricochet
Driving Sports TV Staff
 
Member#: 15542
Join Date: Feb 2002
Location: Kirkland, WA
Vehicle:
1991 Legacy Sedan

Default

I haven't done that *exact* set-up. But we did kind of do something similar with our Project 2.5RS.

Someone else may correct me, but I'm pretty sure the EJ25 is essentially the same in both the US and JDM models (bore, stroke, compression, heads, etc.) So, discounting any benefits from a JDM block, and thinking that you'll be two cams short putting a set of SOHC cams into a DOHC block, I'll pull an estimated 40 HP gain out of the air over a "stock" EJ25. I have no idea what an N/A EJ20 produces.

Now, keep in mind that an aggressive cam will also *kill* your bottom-end. So, you'll now have a theoretical 40HP peak at close to redline...and much less off the line. It will drive more like a turbo car. Though coming from a 2.0, it may be very similar off the line, now that I think about it.

As for increasing your redline, we're running 8000RPM right now using a early version of the forthcoming COBB accessport for N/A, but that will only work on 2005+ MY ECU's. I've read that I-Speed has a flash that will do it for older models, but don't have any experience with it. Your best best may be to go with a full stand-alone system like a MegaSquirt (free to build), AEM, or PerfectPower Pro. The PP6 has limited control over the motor and cannot modify redline.

If you haven't upgraded your internals, I wouldn't recommend bumping your redline any higher than just a smidge over what the block was originally set for. We're running 8K, like I said, but we also have a built and balanced bottom-end.

Given your parts list, I would suggest at least looking at turbo options before jumping into this project. That is, unless you have to replace the block for some other reason anyhow.

Ryan Douthit, Publisher
Subiesport Magazine
http://www.subiesport.com
ricochet is online now   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
I have an idea about how the natl debt works... KingOfSiam Off-Topic 52 09-23-2008 02:59 PM
this thread reserved for those who have to complain about the new software Keith Off-Topic 31 08-29-2006 03:56 AM
For those who have an 03 with the 05 STi scoop Bundyboyz Interior & Exterior Modification 2 06-14-2005 12:03 PM
I have an idea about a sub enclosure, what do you think??? eightballrj Car Audio, Video & Security 3 05-23-2003 12:30 PM
For those who have an apartment, how much $$$ a month??? GooseMan Canada Region Forum 14 01-11-2002 07:48 PM


All times are GMT -4. The time now is 06:31 PM.


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.