Welcome to the North American Subaru Impreza Owners Club Wednesday November 26, 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 08-21-2008, 05:13 PM   #326
Matt Monson
Scooby Guru
 
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
Vehicle:
99 2.5RS, '85 911
'73 914 and 2012 BRZ

Default

Yeah,
It does suck that Borla dropped the single port header from their product line. They pop up on Ebay every once in a while, as well as in the classifieds here and on RS25.com. There's also a rumour that one of our members is making a new one but until something hits the market it's no more than a rumour.
* Registered users of the site do not see these ads.
Matt Monson is offline   Reply With Quote
Old 08-21-2008, 10:55 PM   #327
neilschelly
Scooby Specialist
 
Member#: 94902
Join Date: Aug 2005
Chapter/Region: NESIC
Location: Merrimack, NH
Vehicle:
1988 911 Carrera 3.2
Silver

Default

The Borla ones were veryh fragile, sometimes snapping in less than a day. They were also not designed for any amount of performance gain. The rumble was the sounds of the cylinder exhausts colliding at the same time at the collector - basically a huge restriction. They probably didn't hurt performance, but they were a waste of money for anyone building for speed.

As for the person who was making them, NASIOC powers that be deleted his thread because he wasn't willing to buy a vendor account and he was offering to make them for others to drop the cost of the individual units' materials. I doubt anything's happened now, or if he finished, he made a set of UEL ones for himself and stopped there.
-N
neilschelly is offline   Reply With Quote
Old 08-27-2008, 06:48 PM   #328
Impreza2.5i-Kid
Scooby Newbie
 
Member#: 184611
Join Date: Jul 2008
Chapter/Region: International
Default

Would some or all of this stuff work for the 06/07 2.5i's?? Am I better off just getting a 2.5RS or a 05 RS??
Impreza2.5i-Kid is offline   Reply With Quote
Old 08-27-2008, 07:20 PM   #329
ronoverdrive
Scooby Newbie
 
Member#: 181743
Join Date: Jun 2008
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2008 Impreza 2.5i
dark M. Gray

Default

Quote:
Originally Posted by Impreza2.5i-Kid View Post
Would some or all of this stuff work for the 06/07 2.5i's?? Am I better off just getting a 2.5RS or a 05 RS??
Any exhaust work involving headers would require you to convert to the 05 exhaust setup from the headers back. Other then that nothings really changed.
ronoverdrive is offline   Reply With Quote
Old 09-21-2008, 04:23 PM   #330
neilschelly
Scooby Specialist
 
Member#: 94902
Join Date: Aug 2005
Chapter/Region: NESIC
Location: Merrimack, NH
Vehicle:
1988 911 Carrera 3.2
Silver

Default

Quote:
Originally Posted by Patrick Olsen View Post
So what is the difference in length? Has anyone ever actually measured? I just don't think the difference is enough to be worth worrying about.
The single-port headers are equal length; I just measured. Each side has the same 90deg elbow under the engine and then 18" to the collector.
-N
neilschelly is offline   Reply With Quote
Old 10-07-2009, 06:04 PM   #331
URAL
Scooby Newbie
 
Member#: 211534
Join Date: May 2009
Chapter/Region: Tri-State
Location: Empire State
Vehicle:
1994 Impreza
Aegean Blue

Default Thumbs Up!

What a great write up!

Im just happy you can find a complete flipped wrx for around 2k nowadays
URAL is offline   Reply With Quote
Old 12-13-2009, 09:25 PM   #332
wilsonoff
Scooby Newbie
 
Member#: 232384
Join Date: Dec 2009
Question ej253

Looking to do some n/a modding to my 05 2.5i Legacy, which has the EJ253... has anyone worked with this setup before? I could really use some guidance, because I've been doing a lot of internet reading, but I feel like I'm going in circles trying to find compatible parts. I want to do pretty much everything detailed in this paper (except for cam / head work). Thanks for your time
wilsonoff is offline   Reply With Quote
Old 12-13-2009, 11:21 PM   #333
sa4baru
Scooby Newbie
 
Member#: 195354
Join Date: Nov 2008
Location: State College, PA
Default

anyone know what high compression pistons will work in the ej253 - are there interference issues, especially if over-sized valves are used?

what about getting a high compression piston for the ej257? i've read that the ej257 with SOHC heads lowers the compression into the low 9's. Is there a piston that can up the compression to to 11 or 12? again, are there interference issues?
sa4baru is offline   Reply With Quote
Old 12-14-2009, 09:06 PM   #334
GrundleJuice
NASIOC Supporter
 
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: stupid Florida
Vehicle:
2007 No YELLING
on the bus!

Default

the EJ257 static compression is below 9:1. so it wouldn't be getting "lowered to the low 9's".
GrundleJuice is offline   Reply With Quote
Old 12-15-2009, 10:02 PM   #335
sa4baru
Scooby Newbie
 
Member#: 195354
Join Date: Nov 2008
Location: State College, PA
Default

Quote:
Originally Posted by RaceFaceXC View Post
the EJ257 static compression is below 9:1. so it wouldn't be getting "lowered to the low 9's".
it's not different with the SOHC heads?





seems like the only pistons i can find are TWE...
sa4baru is offline   Reply With Quote
Old 12-15-2009, 10:35 PM   #336
Matt Monson
Scooby Guru
 
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
Vehicle:
99 2.5RS, '85 911
'73 914 and 2012 BRZ

Default

Tomato, toemotto. You guys are both saying the same freaking thing. You are just saying it from opposite sides.

TWE is where I sourced my pistons for this exact application. Ej257 bottom end with SOHC Ej251 heads. IIRC they are 11.2:1
Matt Monson is offline   Reply With Quote
Old 12-15-2009, 11:55 PM   #337
tiger2011
Scooby Newbie
 
Member#: 222392
Join Date: Sep 2009
Chapter/Region: TXIC
Location: TX
Vehicle:
2009 2.5i
Captain Slow

Default

awesome write up. Just one question. With the port and polished heads wouldn't you have to up the red line to make the heads worth while? I'm not too kosher with a 7k + RPM red line without upgrading the pistons, connecting rods, crankshaft ect.
tiger2011 is offline   Reply With Quote
Old 12-16-2009, 01:34 AM   #338
sa4baru
Scooby Newbie
 
Member#: 195354
Join Date: Nov 2008
Location: State College, PA
Default

Quote:
Originally Posted by Matt Monson View Post
Tomato, toemotto. You guys are both saying the same freaking thing. You are just saying it from opposite sides.

TWE is where I sourced my pistons for this exact application. Ej257 bottom end with SOHC Ej251 heads. IIRC they are 11.2:1
thanks for some clarification. seems like very few people actually running high compression pistons in n/a applications.
sa4baru is offline   Reply With Quote
Old 01-15-2010, 03:03 PM   #339
jsaunders
Scooby Newbie
 
Member#: 40059
Join Date: Jul 2003
Chapter/Region: NESIC
Location: NH
Vehicle:
10 CTS--V
thunder grey

Default

nice info
jsaunders is offline   Reply With Quote
Old 01-20-2010, 11:45 PM   #340
cpmason8
Scooby Newbie
 
Member#: 235678
Join Date: Jan 2010
Chapter/Region: International
Vehicle:
2008 2lt r-s
Red looks fast, goes slow

Default

Hi,
My first post. I have a 2 litre 2008 hatch and would like to ask the question, is it worth doing? I live in Singapore and we huge import tax on cars. To give you an Idea. I paid 32000 USD for my second hand car above. New sti hatch is apporox 86,000 USD. So as you can see there is plenty of money to be spent on NA car. But we have strict rules about mods. Pretty much all i can do is CAI, cat back, ecu tune. I can do the handling and tyres as much as i want (which i have done). My question, is it worth doing the mods? Hard to know if there are any gains in power, seems to be varying opinion on this subject. I am very new to mods and have limited knowledge. I have a big hole in the bonnet because the guy that owned it before me put an STI one on. Can i use this for the air intake or not? Seems a waist to have a big hole that does nothing.
Many thanks and any comment is welcome.
cpmason8 is offline   Reply With Quote
Old 01-21-2010, 12:29 AM   #341
Back Road Runner
Scooby Guru
 
Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
Vehicle:
2004 Forester STI
Silver

Default

You can get ok gains with the ECU tune. Intake can do some if done right, but that will also correlate to tune. Many times you can mess up lower rpm air/fuel if you mess up the intake design, so stock is actually as good as you can get with a stock ECU tune. The only real improvement is to guarantee cold air is getting in instead of hot engine bay air. I'm not sure where your intake pulls from, but if it grabs the air from the engine bay rather then from outside, there is room for improvement there. The exhaust, at least the cat back has zero power gains. Really all a cat back does is modify the sound, making it louder. That's it. There's power gains with a good header but not just a cat back.

For the most part, you will see about 10 lb-ft of torque gain with a good ECU tune. Subarus are pretty mildly tuned stock, and there's some room for gains. Tune for a higher octane fuel if you don't mind fuel costs.

The bigger gains will be had through suspension work. Get the car to corner fast, and you'll spend less time braking and accelerating. Cut weight where you are willing to improve the power to weight ratio. You can also look into installing a lightweight flywheel and pulleys. This will require less energy wasted when reving up the engine and make sizable gains in acceleration through the first couple gears.
Back Road Runner is offline   Reply With Quote
Old 01-21-2010, 12:50 PM   #342
cpmason8
Scooby Newbie
 
Member#: 235678
Join Date: Jan 2010
Chapter/Region: International
Vehicle:
2008 2lt r-s
Red looks fast, goes slow

Default

Thanks Back Road runner,

That makes sense. I will tune ecu put in pulleys and focus on handling for now.

Appreciate your comments

Just checked car and it does draw air from the front above the radiator. so no need for CAI could just change air filter from stock. so ecu and pulley it is then.

Last edited by cpmason8; 01-22-2010 at 04:15 AM.
cpmason8 is offline   Reply With Quote
Old 02-23-2010, 02:15 PM   #343
aesthetect
Scooby Specialist
 
Member#: 89051
Join Date: Jun 2005
Location: brohio
Vehicle:
2001 GC6

Default

(subscribed for easy return reference)
aesthetect is offline   Reply With Quote
Old 03-13-2010, 10:08 AM   #344
BLUJI
Scooby Newbie
 
Member#: 52518
Join Date: Jan 2004
Chapter/Region: Tri-State
Location: NY
Vehicle:
2002 OBS
savannah

Outback Sport

Great N/A power post Rally_wgn - Subscribed
surprised I've never came across it before...
BLUJI is offline   Reply With Quote
Old 05-25-2010, 01:53 AM   #345
2003RS2.5
Scooby Newbie
 
Member#: 247651
Join Date: May 2010
Default

Great thread!! YEY first post....
This is very beneficial for new members like myself with a 2.5NA auto.
I'm not looking for 6 sec 0 to 60's just looking to offset the auto transmission and AWD power suck.
2003RS2.5 is offline   Reply With Quote
Old 05-25-2010, 11:05 AM   #346
GEE-OTTO
Scooby Specialist
 
Member#: 201277
Join Date: Jan 2009
Chapter/Region: MAIC
Location: Arlington VA
Vehicle:
2009 Legacy GT
OBP

Default

Quote:
Originally Posted by 2003RS2.5 View Post
Great thread!! YEY first post....
This is very beneficial for new members like myself with a 2.5NA auto.
I'm not looking for 6 sec 0 to 60's just looking to offset the auto transmission and AWD power suck.
Impossible
GEE-OTTO is offline   Reply With Quote
Old 06-13-2010, 08:34 AM   #347
bl00
Scooby Newbie
 
Member#: 243921
Join Date: Apr 2010
Chapter/Region: MAIC
Location: Baltimore
Vehicle:
1999 RSTi

Default

I also really enjoyed this thread. Its great to know at the start what sort of upgrade paths I can look at. Is there any new info on recently released products or revisiting of older upgrades?
bl00 is offline   Reply With Quote
Old 06-14-2010, 02:50 AM   #348
williaty
Scooby Guru
 
Member#: 71092
Join Date: Sep 2004
Chapter/Region: MWSOC
Location: Delaware County, Ohio
Vehicle:
2005 2.5RS Wagon
Regal Blue Pearl

Default

FWIW, there's a considerable amount of information in this thread that is either just outdated because of progress or outright proven to be untrue. It's worth taking some of the mods listed in the first post and then searching the hell out of them rather than taking this thread as the truth.
williaty is offline   Reply With Quote
Old 07-10-2010, 12:38 PM   #349
Tempest1o1
Scooby Newbie
 
Member#: 228254
Join Date: Oct 2009
Default

Fantastic info....!!!!!!
Tempest1o1 is offline   Reply With Quote
Old 07-10-2010, 05:37 PM   #350
Matt Monson
Scooby Guru
 
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
Vehicle:
99 2.5RS, '85 911
'73 914 and 2012 BRZ

Default

Quote:
Originally Posted by williaty View Post
FWIW, there's a considerable amount of information in this thread that is either just outdated because of progress or outright proven to be untrue. It's worth taking some of the mods listed in the first post and then searching the hell out of them rather than taking this thread as the truth.
If you're going to take it that direction, why don't you make yourself useful and point out exactly what things you're talking about? Giving constructive input is the only way these sorts of things get moved forward...
Matt Monson 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
Build-up plans, please critique bongchild Normally Aspirated Powertrain 11 09-27-2005 04:25 PM
OT: Please Critique my resume DrDRum Off-Topic 25 07-20-2005 05:48 PM
Please critique this computer... GarySheehan Off-Topic 67 09-13-2004 07:40 PM
OT please critique my resume suprsubepower Off-Topic 17 03-23-2004 05:15 PM
IT/Developers please critique my resume maaw Off-Topic 9 08-22-2003 04:16 PM


All times are GMT -4. The time now is 09:16 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.