Welcome to the North American Subaru Impreza Owners Club Thursday October 19, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

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 09-30-2007, 02:34 PM   #1
Scooby Specialist
Member#: 65267
Join Date: Jun 2004
Chapter/Region: MAIC
Location: Arlington, VA
2002 WRX

Default Aftermarket Intake Manifolds

I'm running a GT52 on a built 2.5 with V8 Spec C heads and some valvetrain upgrades. My question is this: would a long runner aftermarket intake manifold give me much of a gain? If yes, where in the powerband would it have the greatest effect?

ejh25 is offline   Reply With Quote
Old 09-30-2007, 11:06 PM   #2
Scooby Specialist
Member#: 127041
Join Date: Sep 2006
Location: Marietta, GA
02 WRX
Midnight Blue Pearl


Well if you elongate the runners on an intake manifold then you are more than likely going to see your torque numbers sooner and the power curve flattens out sooner.
STiBottom is offline   Reply With Quote
Old 10-29-2007, 12:06 AM   #3
Scooby Newbie
Member#: 162882
Join Date: Oct 2007
Chapter/Region: NWIC
Location: LACEY
04 wrx


what type of manifold would be best for the torque end i am looking around right now and i have no knowledge on a good manifold
dblrsf1nest is offline   Reply With Quote
Old 10-29-2007, 12:08 AM   #4
Scooby Specialist
Member#: 131371
Join Date: Nov 2006
Chapter/Region: TXIC
Location: Belvitucky
05 buy my parts so
i can get my sti running


i kno the magnus intake manifold is amazing. it comes with ither long runners or short runners.....thats what im going to be using on my build
bloopsta26 is offline   Reply With Quote
Old 10-29-2007, 12:27 AM   #5
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


Patrick Olsen is offline   Reply With Quote
Old 10-29-2007, 12:28 AM   #6
Scooby Guru
Member#: 9960
Join Date: Sep 2001
Location: in bed...
2002 Impreza WRX
WRBlue Perl


^^ reviews on that magnus intake manifold appear to be mixed. Some people like it, others tell you to stay away. Unfortunately more people have the latter to say, so it's hard to see how good or even reliable it is. I know one ex member here was stranded on the side of the road when his popped on him.

Then there is the availability factor also. Nobody seems to have them in stock..more so for the drive by cable version
jigga is offline   Reply With Quote
Old 10-29-2007, 12:33 AM   #7
Homemade WRX
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Mooresville, NC
96 3MI Racing LLC
search FIRST, then PM!!!


longer runners increase lower rpm volumetric efficiencies which translates into low end torque..the trade off is top end volumetric loss. This trade off can be reduced someif the manifold is properly designed to then catch another reflective wave at a higher rpm.
Homemade WRX 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
WTB: Polished or Aftermarket intake manifold midnightsti Private 'Wanted' Classifieds 4 06-13-2006 06:39 PM
Aftermarket intake manifold west005 Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 18 05-30-2006 09:03 PM
Aftermarket Intake Manifolds WRXRallyBlue Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 25 10-03-2005 08:11 PM
New/Aftermarket Intake manifold Twelvz Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 29 03-11-2005 12:32 PM
New Aftermarket Intake Manifold DonkeyPunch Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 14 01-15-2005 06:15 PM

All times are GMT -4. The time now is 11:49 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.