Welcome to the North American Subaru Impreza Owners Club Saturday August 23, 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 09-09-2013, 06:58 PM   #26
KartRacer3
Scooby Specialist
 
Member#: 268328
Join Date: Dec 2010
Chapter/Region: BAIC
Location: Norcal
Vehicle:
2011 2.5i prem pckg
SSM

Default

sub'd for update's. In for dyno results and possible pricing.
* Registered users of the site do not see these ads.
KartRacer3 is offline   Reply With Quote
Old 09-09-2013, 08:22 PM   #27
RalliSport Racing
NASIOC Vendor
 
Member#: 367216
Join Date: Sep 2013
Location: near St. Paul, MN
Default

Quote:
Originally Posted by KartRacer3 View Post
sub'd for update's. In for dyno results and possible pricing.
Well you have good timing because I just updated my website. Dyno results will have to wait a few months. I wouldn't expect any huge gains from these alone, but they are a must for anyone wanting to take full advantage of supporting mods such as cams, head work, etc.
RalliSport Racing is offline   Reply With Quote
Old 09-09-2013, 08:27 PM   #28
gc822
*** Banned ***
 
Member#: 81217
Join Date: Feb 2005
Chapter/Region: Tri-State
Default

Verry nice work
gc822 is offline   Reply With Quote
Old 09-09-2013, 09:26 PM   #29
KartRacer3
Scooby Specialist
 
Member#: 268328
Join Date: Dec 2010
Chapter/Region: BAIC
Location: Norcal
Vehicle:
2011 2.5i prem pckg
SSM

Default

Quote:
Originally Posted by RalliSport Racing View Post
Well you have good timing because I just updated my website. Dyno results will have to wait a few months. I wouldn't expect any huge gains from these alone, but they are a must for anyone wanting to take full advantage of supporting mods such as cams, head work, etc.
Just checked it out. These will definitely be on my list for christmas
KartRacer3 is offline   Reply With Quote
Old 09-10-2013, 08:11 AM   #30
Distant.Calling
Scooby Newbie
 
Member#: 230167
Join Date: Nov 2009
Chapter/Region: MAIC
Location: Libtardistan
Vehicle:
2006 2.5i
CGM

Default

Quote:
Originally Posted by RalliSport Racing View Post

Well you have good timing because I just updated my website. Dyno results will have to wait a few months. I wouldn't expect any huge gains from these alone, but they are a must for anyone wanting to take full advantage of supporting mods such as cams, head work, etc.
I'm not that versed in engine work, but would such supporting mods increase the compression ratio?
Distant.Calling is offline   Reply With Quote
Old 09-13-2013, 09:13 AM   #31
AMCjavelin74
Scooby Newbie
 
Member#: 368199
Join Date: Sep 2013
Chapter/Region: MWSOC
Location: Mitten State
Vehicle:
2004 Impreza 2.5 5sp
Red

Default

Quote:
Originally Posted by Distant.Calling View Post
I'm not that versed in engine work, but would such supporting mods increase the compression ratio?
To increase static compression, you can mill the cylinder heads and/or run thinner head gaskets. I'd go against using a domed piston since it's not very efficient for flame travel to have a combustion chamber shaped like an orange peel. I think that ideally a slight dish in the piston is preferred as it offers more "working" surface area for the combustion pressures to push against.

Bolt-on parts, such as intakes and exhaust, reduce pumping losses. You're not really making any more power, just freeing up power that was spent pumping air through a restrictive factory (designed to be cheap to make and easy to install during manufacture and quiet too) intake or exhaust system.

As for turbos, an engine running at 14.7psi or 1 bar basically doubles the displacement of the engine with the intake side of the engine operating under double atmospheric pressure. A 2 liter turbo engine at 14.7psi makes approximately the same power as a similar technology 4 liter naturally aspirated engine. I say "similar technology" since a fairly modern Subaru turbo engine will make more power than, say, a 4L (or 242 cubic inches) Jeep engine with roots tracing to 1964.
AMCjavelin74 is offline   Reply With Quote
Old 09-14-2013, 09:03 AM   #32
Distant.Calling
Scooby Newbie
 
Member#: 230167
Join Date: Nov 2009
Chapter/Region: MAIC
Location: Libtardistan
Vehicle:
2006 2.5i
CGM

Default

Quote:
Originally Posted by AMCjavelin74 View Post

To increase static compression, you can mill the cylinder heads and/or run thinner head gaskets. I'd go against using a domed piston since it's not very efficient for flame travel to have a combustion chamber shaped like an orange peel. I think that ideally a slight dish in the piston is preferred as it offers more "working" surface area for the combustion pressures to push against.

Bolt-on parts, such as intakes and exhaust, reduce pumping losses. You're not really making any more power, just freeing up power that was spent pumping air through a restrictive factory (designed to be cheap to make and easy to install during manufacture and quiet too) intake or exhaust system.

As for turbos, an engine running at 14.7psi or 1 bar basically doubles the displacement of the engine with the intake side of the engine operating under double atmospheric pressure. A 2 liter turbo engine at 14.7psi makes approximately the same power as a similar technology 4 liter naturally aspirated engine. I say "similar technology" since a fairly modern Subaru turbo engine will make more power than, say, a 4L (or 242 cubic inches) Jeep engine with roots tracing to 1964.
Very interesting. Thanks for the response!
Distant.Calling is offline   Reply With Quote
Old 10-28-2013, 11:12 AM   #33
arthuruscg
Scooby Newbie
 
Member#: 228844
Join Date: Nov 2009
Chapter/Region: MAIC
Location: Southern MD
Vehicle:
2008 Outback 2.5i

Default

Wow, does it hang down lower then stock? I am also thinking about a skid plate.
arthuruscg is offline   Reply With Quote
Old 12-21-2013, 12:57 AM   #34
RalliSport Racing
NASIOC Vendor
 
Member#: 367216
Join Date: Sep 2013
Location: near St. Paul, MN
Default Just in time for Christmas

I reacquired these from the original purchaser (who sold his Subie) about a month ago, so they have only about three months of use on them. They have the OEM grade high flow cat and I just had them ceramic coated in Cerma Krome. They are beautiful, in stock and ready to ship!

In the mean time before they sell, if anyone with a 06-11 2.5i near St. Paul MN would like to help me dyno test them, I and the community would be grateful.
RalliSport Racing is offline   Reply With Quote
Old 12-21-2013, 01:27 PM   #35
Back Road Runner
Scooby Guru
 
Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
Vehicle:
2004 Forester STI
Silver

Default

It'd be fun to test if I had a car that it could bolt to. I've dyno ran my old Forester a couple times and have done a ton of road logging as I modded it. Unfortunately it's using a very long, old TWE header that doesn't bolt up to the stock location.
Back Road Runner is offline   Reply With Quote
Old 12-22-2013, 08:47 PM   #36
MillercLean
Scooby Newbie
 
Member#: 376621
Join Date: Dec 2013
Default

Those look great! Very jealous of those water cut flanges.
MillercLean is offline   Reply With Quote
Old 05-01-2014, 09:25 PM   #37
MercuryGodOfInfinity
Scooby Newbie
 
Member#: 362799
Join Date: Jul 2013
Chapter/Region: NESIC
Location: Massachusetts
Vehicle:
2008 Impreza OBS
Obsidian Black

Default

Wow I stopped looking for headers for my 08 OBS last year at the beginning of the summer. Now I am stoked to find this RalliSport Racing information. It's awesome that you would dedicated your time to designing, fabricating, testing and selling these. I am most definitely interested in buying one of these options very soon.

Is there any new information since the end of last year?
MercuryGodOfInfinity is offline   Reply With Quote
Old 05-03-2014, 06:34 AM   #38
James2.5i
Scooby Newbie
 
Member#: 305063
Join Date: Dec 2011
Chapter/Region: Tri-State
Location: Central Jersey
Vehicle:
2010 Storm Trooper

Default

If only there was another thread with thousands of replies, some of which were as recent as the past few days.......
James2.5i is offline   Reply With Quote
Old 05-03-2014, 11:20 AM   #39
clee2318
Scooby Newbie
 
Member#: 265538
Join Date: Nov 2010
Chapter/Region: MWSOC
Location: MN
Vehicle:
2007 impreza 2.5i
satin white

Default

Quote:
Originally Posted by RalliSport Racing View Post
I reacquired these from the original purchaser (who sold his Subie) about a month ago, so they have only about three months of use on them. They have the OEM grade high flow cat and I just had them ceramic coated in Cerma Krome. They are beautiful, in stock and ready to ship! In the mean time before they sell, if anyone with a 06-11 2.5i near St. Paul MN would like to help me dyno test them, I and the community would be grateful.
i have a 07 2.5i and im from stp mn, if u want to dyno test them lmk.
clee2318 is offline   Reply With Quote
Old 05-03-2014, 01:22 PM   #40
RalliSport Racing
NASIOC Vendor
 
Member#: 367216
Join Date: Sep 2013
Location: near St. Paul, MN
Default

Quote:
Originally Posted by MercuryGodOfInfinity View Post
Wow I stopped looking for headers for my 08 OBS last year at the beginning of the summer. Now I am stoked to find this RalliSport Racing information. It's awesome that you would dedicated your time to designing, fabricating, testing and selling these. I am most definitely interested in buying one of these options very soon.

Is there any new information since the end of last year?
As for the EL version, the one in this thread was the only one I've ever sold, sadly. After I bought it back from the original customer and had it ceramic coated, I sat on it for a while and then ended up selling it for a loss just to get rid of it. The reality is that there just doesn't seem to be a market for a well made (but expensive) direct bolt on EL header.
RalliSport Racing is offline   Reply With Quote
Old 05-05-2014, 10:55 AM   #41
MercuryGodOfInfinity
Scooby Newbie
 
Member#: 362799
Join Date: Jul 2013
Chapter/Region: NESIC
Location: Massachusetts
Vehicle:
2008 Impreza OBS
Obsidian Black

Default

Quote:
As for the EL version, the one in this thread was the only one I've ever sold, sadly. After I bought it back from the original customer and had it ceramic coated, I sat on it for a while and then ended up selling it for a loss just to get rid of it. The reality is that there just doesn't seem to be a market for a well made (but expensive) direct bolt on EL header.
That's a bummer that you had to take a loss on that. I would love to buy one of the EL headers, it just helps to see some real application info like before and after results, or comparison to your UEL setups.

Quote:
If only there was another thread with thousands of replies, some of which were as recent as the past few days.......
If only your comment actually helped me, or was even relevant to the EL headers I was interested in which apparently there was only one header ever sold.. If you are referring to a thread that is about the one EL header that RalliSport Racing ever sold then I would be surprised yet interested to know which thread it is.
MercuryGodOfInfinity is offline   Reply With Quote
Old 05-06-2014, 09:49 PM   #42
Distant.Calling
Scooby Newbie
 
Member#: 230167
Join Date: Nov 2009
Chapter/Region: MAIC
Location: Libtardistan
Vehicle:
2006 2.5i
CGM

Default

Would there be a CEL with the model without the cat? I wish someone would help out RSR with the dyno. Wonder if there's a huge difference between the EL and UEL model in terms of power.
Distant.Calling 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


All times are GMT -4. The time now is 02:42 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.