Welcome to the North American Subaru Impreza Owners Club Friday September 22, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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 05-02-2006, 11:09 PM   #1
Scooby Specialist
Member#: 93301
Join Date: Aug 2005
Chapter/Region: NWIC
Location: Portland, Oregon
06 CGM STI SM#17
Now with alot less verve!

Default Manifold and Header Dyno Comparo results

We bought all the stuff for a dyno comparison (and road spool logging) of the following items:

1. stock manifold (a stage 2 06 STi) (free)
2. IOTA (Gotpnp.com) ported manifolds and crosspipe ($160+shipping+core)
3. Crucial Racing ported and coated manifold and coated Injen crosspipe (~$500+core)
4. Perrin's new Equal Length headers ($779+shipping)
5. Gruppe-S un-equal length coated headers ($575 shipped)

The following folks together contributed over 3/4 of the monetary costs of the dyno:
1. Unibomber ($20)
2. JitenShakun ($5)
3. Senortighto ($20)
4. SilverSurfer04STi ($20)
5. modaddict ($10)
6. evodon84 ($10)
7. Verc ($10)
8. Crucial Racing ($20)
9. TylerTR ($10)
10. Freon ($20)
11. Tucker63 ($20)
12. EKW ($10)
13. KipA ($10)
14. WolfPlayer ($10)
15. JBlaine ($28.49)
16. Reid-o ($15)

Q: Why different days?
We dyno'd after we got there with all the learning the car could have done (several weeks). We then, for a last run, reset the computer (not shown above). The car lost a bit of power and torque (~10 tq/hp). This is significant enough to us that we'd like to let the car learn each of the manifoldsheaders through a day or two of pretty hard driving. We are using Cobb's standard stage 2 map. If we changed the manifolds out on the dyno for one big Manifoldapalooza, we would have to reset the computer each time, and we believe this will produce inaccurate results...


All logs are contained in the following post:

Dyno graph key:
RunFile_002 - Stock
RunFile_006 - IOTA
RunFile_011 - Crucial and Injen
RunFile_016 - Perrin Equal-Length, non-coated
RunFile_020 - Gruppe-S UnEqual-Lenth, coated


SAE Corrected:

I can post individual comparisons as requests come up, but those results should give you the data in a quick hit.

A opinions on the results:
- As the money goes up, so do the results. THere were no extreme values in comparison to others. Each cost seemed to buy you incrementally more power.

- The only hit to spool was the classic unequal-length headers. I suspect under hot, demanding conditions, the system could get hot and would make the hit to the spool less.

- Spool is effected almost entirely by the ability of the system to keep heat in the exhaust, and the fittiment of the system so as to prevent leaks.

- For the same results, the Crucial setup or the IOTA porting with an Injen crosspipe offers stock-like fittiment and probably VERY few issues come warrantee time.

- The Perrin offer top notch results and top notch construction at a top-notch price (especially after coating and wrapping). The downside/upside is the change in the sound of the car. I, personally, like it. But I have no aversion to sounding like a Honda and no special attachment to the Boxer sound. Others certainly may differ. If I need to listen to a lope, I have a big-cam Chevy LS-1 in the garage The Perrins make the car a bit quieter also, in my non-scientific opinion. Certainly less resonant on the highway.

Let's discuss
* Registered users of the site do not see these ads.
RainMaker is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 09-29-2008, 09:22 PM   #2
Scooby Specialist
Member#: 122030
Join Date: Aug 2006
Chapter/Region: MWSOC
Location: Private Profits - Social Loss

Can you re-host the picts?
fullerton is offline   Reply With Quote
Old 09-01-2009, 08:32 PM   #3
Scooby Specialist
Member#: 162529
Join Date: Oct 2007
Chapter/Region: MWSOC
Location: Kentucky
2006 STI SGM
2004 4Runner


schrags 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
Manifold and Header Comparo results RainMaker Proven Power Bragging 204 08-21-2009 12:04 AM
OBX header vs. MRT header dyno results Patrick Olsen Normally Aspirated Powertrain 7 06-26-2006 08:31 AM
FS: TurboXS TMIC, intake manifold, and header TypeR North West Impreza Club Forum -- NWIC 2 05-20-2005 02:06 AM
and the great dyno comparo grows jmott Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 14 03-08-2002 02:44 PM
and the great dyno comparo grows jmott Texas Impreza Club Forum -- TXIC 0 03-08-2002 04:17 AM

All times are GMT -4. The time now is 10:05 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.