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06-01-2015, 03:41 PM | #401 |
Scooby Newbie
Member#: 146732
Join Date: Apr 2007
Chapter/Region:
MWSOC
Location: Minnesota
Vehicle:2006 Impreza 2.5i Obsidian Black Swirl |
N/A power white paper, long, please critique.
Hi folks, looking for a sanity check. On a 2006 2.5i with stock redline and cams, is there any point in going with the TWE high output (2.5") header offerings, or am I better off sticking with the 2.25" super sports for a ST* autox car?
Alternatively, am I missing something fundamental about the way those 4-2-1's move the power band?
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Last edited by ArcticWolf; 06-01-2015 at 03:51 PM. |
06-01-2015, 03:48 PM | #402 |
Scooby Guru
Member#: 71092
Join Date: Sep 2004
Chapter/Region:
MWSOC
Location: Licking County, Ohio
Vehicle:2005 2.5RS Wagon Regal Blue Pearl |
There is no 2005 2.5i.
Do you mean 2005 2.5RS or 2006 2.5i? If you mean a 2005 2.5RS, then things will improve dramatically with the High Output headers (which is what I have). You'll get a TON of extra torque all through the power band. However, the biggest gain is the fact that they keep breathing up close to 7kRPM. If you're not raising the redline, I'm not sure if the SS would be better than the HO. I'm sure if you call Tom at TWE, he'll discuss it with you. |
06-01-2015, 03:51 PM | #403 |
Scooby Newbie
Member#: 146732
Join Date: Apr 2007
Chapter/Region:
MWSOC
Location: Minnesota
Vehicle:2006 Impreza 2.5i Obsidian Black Swirl |
Meant 2006, defeated by phone keyboard once again. Editing original...
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06-01-2015, 03:57 PM | #404 |
Scooby Guru
Member#: 71092
Join Date: Sep 2004
Chapter/Region:
MWSOC
Location: Licking County, Ohio
Vehicle:2005 2.5RS Wagon Regal Blue Pearl |
With the 2006, I'm really not sure what you'll see on stock cams, let alone vs that stock header (which is MUCH better than the older stock header). You definitely need to talk to Tom at length about your goals and limitations for the car.
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06-08-2015, 03:32 PM | #405 |
Scooby Newbie
Member#: 421571
Join Date: May 2015
Chapter/Region:
MWSOC
Location: Minnesota
Vehicle:2004 Impreza Red |
Good write up for sure!
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06-11-2015, 12:30 PM | #406 |
Scooby Specialist
Member#: 83764
Join Date: Mar 2005
Chapter/Region:
South East
Location: Bossier City, La
Vehicle:02 02 WRX/00 RS |
https://youtu.be/zcoE9U7M5wU
Here is mine. I have since added Area1320 TB spacer, Grimmspeed phenolic spacers and grounding kit as well as removing a crap load of weight. Havent got it re-dyno'd though |
12-08-2015, 01:04 AM | #407 | |
Scooby Newbie
Member#: 374688
Join Date: Nov 2013
Chapter/Region:
NWIC
Location: Bend Oregon
Vehicle:2005 STI WRB |
Quote:
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12-08-2015, 02:27 PM | #408 |
Scooby Specialist
Member#: 83764
Join Date: Mar 2005
Chapter/Region:
South East
Location: Bossier City, La
Vehicle:02 02 WRX/00 RS |
Getting stuff together for the fuel cell swap over and upgrading the rear suspension with a new swaybar and stout mounts as well as lateral links and arms. http://www.rs25.com/forums/f145/2222...-racing-2.html |
05-19-2016, 05:14 PM | #409 |
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Member#: 447273
Join Date: May 2016
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Does anyone have any info on the 300hp motor in the original post? The link is broken.
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01-17-2017, 11:25 PM | #410 | |
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Join Date: Mar 2016
Chapter/Region:
MAIC
Location: Beautiful Downtown Goode, VA
Vehicle:2009 WRX sedan the faster charcoal grey |
Quote:
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01-18-2017, 06:32 AM | #411 |
Scooby Newbie
Member#: 446519
Join Date: May 2016
Chapter/Region:
MWSOC
Location: Cuyahoga Falls, Ohio
Vehicle:2010 WRX Premium Rally Blue |
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05-05-2017, 09:37 PM | #412 |
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Member#: 411867
Join Date: Jan 2015
Chapter/Region:
E. Canada
Location: Winnipeg
Vehicle:2011 Impreza 2.5i WRB |
Anybody here has ported and polisshed their headers?
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05-06-2017, 12:01 PM | #413 |
Scooby Newbie
Member#: 446519
Join Date: May 2016
Chapter/Region:
MWSOC
Location: Cuyahoga Falls, Ohio
Vehicle:2010 WRX Premium Rally Blue |
It would be interesting to know how these power gains stack up against current WRX / STi numbers.
If they're pretty good, I may consider picking up an NA from a junkyard and doing a full teardown and rebuild with Stage1/2 components and just doing a swap out. It would let me put the money in when I have it, a 'little' at a time. |
05-08-2017, 12:17 PM | #414 |
Scooby Specialist
Member#: 161832
Join Date: Oct 2007
Chapter/Region:
Tri-State
Location: PA
Vehicle:2000 Outback Limited Black |
ScooBear... "Stage1/2 components"?
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05-08-2017, 01:24 PM | #415 |
NASIOC Supporter
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Join Date: Dec 2002
Chapter/Region:
Tri-State
Location: USA, North NJ, 07456
Vehicle:1998 Legacy 2.5GT Silver Sleeper BK, 5MT |
As I said in another thread, nothing really to port on tube headers. Make sure the header inlet/flange is a bit bigger than the head outlet, make sure the exposed end of the tubes is pressed against the ID of the flange. A small ballpeen hammer helps with this.
Polishing the outside is for looks, won't hurt or gain anything. |
05-08-2017, 11:22 PM | #416 |
Scooby Newbie
Member#: 446519
Join Date: May 2016
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MWSOC
Location: Cuyahoga Falls, Ohio
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05-09-2017, 09:53 AM | #417 |
Scooby Specialist
Member#: 161832
Join Date: Oct 2007
Chapter/Region:
Tri-State
Location: PA
Vehicle:2000 Outback Limited Black |
i mean what engine parts are you considering stage 1 and/or 2?
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05-10-2017, 12:28 AM | #418 | |
Scooby Newbie
Member#: 446519
Join Date: May 2016
Chapter/Region:
MWSOC
Location: Cuyahoga Falls, Ohio
Vehicle:2010 WRX Premium Rally Blue |
Quote:
On a side note, knowing next to nothing about the actual mechanical makeup of a Subi engine, can the 2.5 na be resleeved? Bored over? Would be nice to bump it up to a around a 3.0L. No replacement for displacement, after all. Just a thought that crossed my mind while driving around today. |
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05-11-2017, 04:55 PM | #419 |
Scooby Specialist
Member#: 161832
Join Date: Oct 2007
Chapter/Region:
Tri-State
Location: PA
Vehicle:2000 Outback Limited Black |
ScooBear... N/A's won't make gobs of power. Bolt-ons and cams on a SOHC 2.5L will be somewhere around 225HP at the crank. this is my build...
http://xcceleration.com/imp-gallery-...back.25.na.htm adding high-compression pistons/internals, head work, throttle body, intake manifold, etc MAY get you around 265HP at the crank. i know of only 1 that made reliable high power as N/A... http://xcceleration.com/imp-gallery-rs.htm XXYYZZ motorsport had one that made near 300HP at the crank, but ran like crap and blew up. |
05-11-2017, 06:02 PM | #420 | |
Scooby Newbie
Member#: 374688
Join Date: Nov 2013
Chapter/Region:
NWIC
Location: Bend Oregon
Vehicle:2005 STI WRB |
Quote:
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06-24-2017, 11:18 PM | #421 |
Scooby Newbie
Member#: 469887
Join Date: Jun 2017
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Almost done wading through the crap.
It's kinda disconcerting - new member, seriously considering owning a Subaru, looking at popular informative forums, and get treated to pissant bickering. Oh well, working my way to the current posts! |
06-25-2017, 12:16 AM | #422 | |
Scooby Specialist
Member#: 464727
Join Date: Mar 2017
Vehicle:2008 Outback Sport OBP/DGM |
Quote:
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06-25-2017, 04:32 PM | #423 |
Scooby Newbie
Member#: 446519
Join Date: May 2016
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MWSOC
Location: Cuyahoga Falls, Ohio
Vehicle:2010 WRX Premium Rally Blue |
Thanks for these links, Terrainasaurus... Still unsure about the route I'm gonna take... I may just end up finding a late model sti engine at a junkyard and putting it on an engine stand, take it all the way down to the bearings and upgrade everything a little and see what I can do. Either way, I can see sinking $8k to $10k into the engine and then dropping it back into my OBS platform and enjoying my sleeper ***128527;
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06-25-2017, 06:30 PM | #424 | |
Scooby Specialist
Member#: 464727
Join Date: Mar 2017
Vehicle:2008 Outback Sport OBP/DGM |
Quote:
Well have to get some OB-STI or OBS-T badges made |
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06-25-2017, 07:58 PM | #425 |
Scooby Specialist
Member#: 464727
Join Date: Mar 2017
Vehicle:2008 Outback Sport OBP/DGM |
Recently I've been debating whether or not to go TWE headers for full n/a, or get wrx/sti EL headers with a custom catback and be able to swap them onto an ej257 to take the sti swap route.
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