Welcome to the North American Subaru Impreza Owners Club Friday May 27, 2016
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
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. 
Reply
 
Thread Tools Display Modes
Old 02-16-2010, 04:04 PM   #801
BAN SUVS
Scooby Specialist
 
Member#: 28685
Join Date: Nov 2002
Location: Reno, Nevada
Vehicle:
2004 FXT 4EAT
very STi'd

Default

Quote:
Originally Posted by MartinSTi05 View Post
Dual pass intercooler?
Either that or no-pass intercooler.
* Registered users of the site do not see these ads.
BAN SUVS is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 02-16-2010, 04:45 PM   #802
wgknestrick
Scooby Specialist
 
Member#: 32576
Join Date: Feb 2003
Location: Stevens, PA
Vehicle:
04 STI

Default

Quote:
Originally Posted by leoimpreza View Post




Not to start an E fight, just giving suggestions. What works with cooling systems turns into the worst flowing intercooler you could've made for your car.

There is nothing good about that end tank design for your otherwise awesome setup.
wgknestrick is offline   Reply With Quote
Old 02-16-2010, 05:10 PM   #803
TheMadScientist
Scooby Guru
 
Member#: 23717
Join Date: Aug 2002
Chapter/Region: NESIC
Location: Beverly, MA
Vehicle:
2005 Big red

Default

Does it even cool? Looks like inlet and outlet is on the same endtank.
TheMadScientist is offline   Reply With Quote
Old 02-16-2010, 05:20 PM   #804
CKxx
Scooby Specialist
 
Member#: 33458
Join Date: Feb 2003
Chapter/Region: Tri-State
Location: PA
Vehicle:
Your BOV sounds lame
93 RX7+09 Forester

Default

Quote:
Originally Posted by TheMadScientist View Post
Does it even cool? Looks like inlet and outlet is on the same endtank.
Normally a setup like that has a divider wall inside the top end-tank between the inlet and outlet. The air has to go down through the core, make a u-turn in the bottom end-tank, and then come up the other side.
CKxx is offline   Reply With Quote
Old 02-21-2010, 03:02 PM   #805
leoimpreza
Scooby Specialist
 
Member#: 197989
Join Date: Dec 2008
Chapter/Region: International
Location: Greece, Athens
Vehicle:
2002 Impreza WRX STI
WR Blue

Default

leoimpreza is offline   Reply With Quote
Old 03-09-2010, 11:42 AM   #806
25rsti
Scooby Guru
 
Member#: 166324
Join Date: Dec 2007
Chapter/Region: NESIC
Location: BLOD in BLOD out
Default


if you use this intake mani, what are you supposed to do using the wrx dbc throttle body? you can clearly see its not right
25rsti is offline   Reply With Quote
Old 03-09-2010, 05:29 PM   #807
25rsti
Scooby Guru
 
Member#: 166324
Join Date: Dec 2007
Chapter/Region: NESIC
Location: BLOD in BLOD out
Default

anyone?
25rsti is offline   Reply With Quote
Old 03-09-2010, 05:46 PM   #808
CKxx
Scooby Specialist
 
Member#: 33458
Join Date: Feb 2003
Chapter/Region: Tri-State
Location: PA
Vehicle:
Your BOV sounds lame
93 RX7+09 Forester

Default

Quote:
Originally Posted by 25rsti View Post
anyone?
It isn't an easy process. I had the "backing" built up with weld, and then machined flat so that I could mount my DBW TB.
CKxx is offline   Reply With Quote
Old 03-09-2010, 11:19 PM   #809
Brydon
Scooby Specialist
 
Member#: 107569
Join Date: Feb 2006
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
1998 Forester S
SRP

Default

Quote:
Originally Posted by 25rsti View Post
anyone?




I built an aluminum plate between mine and it seems to run great. I of course also had to make a throttle holder.
Brydon is offline   Reply With Quote
Old 03-10-2010, 04:45 PM   #810
25rsti
Scooby Guru
 
Member#: 166324
Join Date: Dec 2007
Chapter/Region: NESIC
Location: BLOD in BLOD out
Default

hmmm...interesting. scary but interesting.

has anyone used or looked into the sohc long runner intake manifolds of older years, ie 99???
25rsti is offline   Reply With Quote
Old 03-11-2010, 12:15 PM   #811
Bob the fabricator
Scooby Newbie
 
Member#: 104246
Join Date: Jan 2006
Chapter/Region: NESIC
Location: Pleasant Valley, CT
Default

Quote:
Originally Posted by 25rsti View Post
if you use this intake mani, what are you supposed to do using the wrx dbc throttle body? you can clearly see its not right
Not a big deal, I've prepped about 10 of each over the years (DBC and DBW). For the DBC, I welded and redrilled the intake to the correct pattern, and made a phenolic spacer to block the coolant passage that inevitably is exposed on the TB.

Bob the fabricator is offline   Reply With Quote
Old 03-11-2010, 02:22 PM   #812
25rsti
Scooby Guru
 
Member#: 166324
Join Date: Dec 2007
Chapter/Region: NESIC
Location: BLOD in BLOD out
Default

oh man! i wish you had some more in depth pictures, or step by step stuff. good work either way
25rsti is offline   Reply With Quote
Old 03-12-2010, 12:02 PM   #813
Bob the fabricator
Scooby Newbie
 
Member#: 104246
Join Date: Jan 2006
Chapter/Region: NESIC
Location: Pleasant Valley, CT
Default

Quote:
Originally Posted by 25rsti View Post
oh man! i wish you had some more in depth pictures, or step by step stuff. good work either way
I have a few more pics of other intakes I've prepped on flickr, but nothing up close at the mounting flange.
Bob the fabricator is offline   Reply With Quote
Old 03-19-2010, 12:32 AM   #814
sick1.8t
Scooby Specialist
 
Member#: 22345
Join Date: Aug 2002
Chapter/Region: NESIC
Location: Boston
Vehicle:
2003 RSX
black

Default

yeah the adapter plate is the easiest method. make sure you make provisions for the idle valve.
sick1.8t is offline   Reply With Quote
Old 03-19-2010, 06:26 PM   #815
25rsti
Scooby Guru
 
Member#: 166324
Join Date: Dec 2007
Chapter/Region: NESIC
Location: BLOD in BLOD out
Default

easy huh, doesnt look it. the flange on that mani is smaller than the throttle body it self
25rsti is offline   Reply With Quote
Old 07-30-2010, 02:11 AM   #816
Kosmic
Scooby Specialist
 
Member#: 99140
Join Date: Oct 2005
Chapter/Region: E. Canada
Location: YUL
Vehicle:
GD Racing chassis
Slowly in construction

Default

Kosmic is offline   Reply With Quote
Old 08-08-2010, 10:50 AM   #817
Kosmic
Scooby Specialist
 
Member#: 99140
Join Date: Oct 2005
Chapter/Region: E. Canada
Location: YUL
Vehicle:
GD Racing chassis
Slowly in construction

Default

I'm wondering how much gain you get using velocity stacks vs none in a forced induction IM setup?
Kosmic is offline   Reply With Quote
Old 08-11-2010, 12:34 PM   #818
Kosmic
Scooby Specialist
 
Member#: 99140
Join Date: Oct 2005
Chapter/Region: E. Canada
Location: YUL
Vehicle:
GD Racing chassis
Slowly in construction

Default

Another Q

Runner length start from back face of the intake valve all the way to the opposite wall facing velocity stack?

For a good wave rebound, must the runners be stagered? so that the wave hit the opposite wall...not the other side velocity stack?

Noobish!!

Thanks for the help.
Kosmic is offline   Reply With Quote
Old 08-11-2010, 12:50 PM   #819
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: 3MI Racing LLC
Vehicle:
96 bastard child
search FIRST, then PM!!!

Default

yup, you measure runner length from the source of the wave face....thus the valve.

the return wave comes from the plenum...pressure differences. Now you have sound and pressure waves to think of in this case.

speedtalk forums and fsae forums would be some good reading for you. Really, you have a lot of reading to do and I don't want to do a lot of typing

Hopefully I'll get some money coming in soon to FINALLY build a manifold. Something I've been wanting to do on a subie for a long time.

One mistake you will commonly see on subaru designed manifolds where they run a dual plenum is that they have two intake strokes back to back on the same plenum. Now I know that it is done sometimes in light of other trade offs BUT it isn't desirable from a design stand point. You have less time to charge the plenum or see it as a greater pressure drop in the plenum. To fight this, you'd have to make a large plenum that would in effect hinder other aspects of plenum performance.
Homemade WRX is offline   Reply With Quote
Old 08-12-2010, 12:08 AM   #820
Kosmic
Scooby Specialist
 
Member#: 99140
Join Date: Oct 2005
Chapter/Region: E. Canada
Location: YUL
Vehicle:
GD Racing chassis
Slowly in construction

Default

Thanks Micah for directing me into those forums. I don't mind reading....good stuff!
Kosmic is offline   Reply With Quote
Old 08-12-2010, 12:21 PM   #821
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: 3MI Racing LLC
Vehicle:
96 bastard child
search FIRST, then PM!!!

Default

IIRC there was a site (grapeaperacing or something like that) that had a good, basic read on helmholtz tuning.
Homemade WRX is offline   Reply With Quote
Old 08-12-2010, 01:29 PM   #822
Kosmic
Scooby Specialist
 
Member#: 99140
Join Date: Oct 2005
Chapter/Region: E. Canada
Location: YUL
Vehicle:
GD Racing chassis
Slowly in construction

Default

Quote:
Originally Posted by Homemade WRX View Post
IIRC there was a site (grapeaperacing or something like that) that had a good, basic read on helmholtz tuning.
Yep, I printed that .pdf

http://www.grapeaperacing.com/tech/inductionsystems.pdf

I came to 15.48" for the runners length (2.250" ID) on a 280 Crower cams 6000RPM tuning - 3rd wave.

2.5l plenum (single) volume on a 2.35l 22T stroker sounds good?

Thx

Last edited by Kosmic; 08-12-2010 at 01:46 PM.
Kosmic is offline   Reply With Quote
Old 02-19-2011, 02:29 AM   #823
methaddict
Scooby Specialist
 
Member#: 159738
Join Date: Sep 2007
Chapter/Region: SCIC
Location: SGV
Vehicle:
2004 WRB STi
Full Race TS, BW 8374 EFR

Default

I know this looks like another Magnus ebay copy and it is a pos one at that. Pics taken down due to waste of bandwidth. Thanks for informing, bjm. Don't waste your money with this one. Link left on to remind everyone to stay away from this one.

link:Ebay auction Demon Motorsports intake manifold

Last edited by methaddict; 02-19-2011 at 04:24 AM.
methaddict is offline   Reply With Quote
Old 02-19-2011, 04:05 AM   #824
bjm
Scooby Newbie
 
Member#: 87090
Join Date: May 2005
Default

It's a cheap POS manifold that looks great in photos but not so hot in person.
I have one which is identical. It does not delete the TGV, it sits on top of them. If you notice there are no injectors bosses on the runners.

The runners are too small and where they enter the plenum they are just cut of straight. There has been no attempt to improve flow with bellmouths or even blending them into the wall of the plenum.

I had this when I made the decision to have my stock manifold because I thought I could get better flow out of it.

Here's the pictures of mine





bjm is offline   Reply With Quote
Old 02-19-2011, 05:10 AM   #825
Bohemian_Funk
Scooby Newbie
 
Member#: 171218
Join Date: Feb 2008
Chapter/Region: NWIC
Location: Auburn, WA
Vehicle:
1999 Impreza 2.5RS
"Silverthorn Metallic"

Default

Good lord, who made that manifold? Personally, I would save the $400 for that pile of crap and just get the stock manifold extrude-honed, then take a dremel to it and the heads. Cleaning up the ports a little bit and port matching the manifold should be more than enough for whatever you're trying to do, really. At least, that's what I'd have to say if you're looking at intake manifolds on eBay. That one looks like they took an old muffler, and added some pre-bent tubes and flanges to it. That "divider" is useless, btw. If it was honestly something that actually did anything (especially for a turbo motor), Cosworth would have done it years ago.

To be honest, if you're really running a twinscroll 8364 setup (please tell me you went external wastegate), I would just drop the $1200 on the Cosworth manifold. I really hope you've taken care of everything else, though (oil system, fuel system, exhaust, valvetrain, engine block, fuel/spark management, boost management, drivetrain, drivetrain, brakes, etc.). Remember, you get what you pay for; paying less for sub-quality parts leads to paying for a metric a**ton of repairs later. For example, if you bought that manifold, under full racing conditions I could fairly easily see that little "air divider" shearing off and suddenly becoming one with your intake tract.
Bohemian_Funk 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
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 03:49 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2016 Axivo Inc.
Copyright ©1999 - 2016, North American Subaru Impreza Owners Club, Inc.