Welcome to the North American Subaru Impreza Owners Club Thursday November 27, 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 > 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.
Reply
 
Thread Tools Display Modes
Old 01-15-2007, 01:32 AM   #1
oversteer
Scooby Newbie
 
Member#: 14923
Join Date: Feb 2002
Vehicle:
2007 Subaru turbo

Default 300whp with stock air intake. Anyone?

My STi has a 3" TBE and APS headers but even with a COBB Protune I can't hit the magic 300whp mark. This has me thinking that the stock airbox and panel filter might be holding me back a bit. Have any stock turbo STis hit over 300whp without some kind of air intake kit? How much power should I gain with the APS cold air intake?
* Registered users of the site do not see these ads.
oversteer is offline   Reply With Quote
Old 01-15-2007, 01:43 AM   #2
06blksubwrx
Scooby Newbie
 
Member#: 109084
Join Date: Mar 2006
Chapter/Region: South East
Location: Oviedo, Fl
Vehicle:
06 VF39 WRX
12.50 @109.1 Sleeper

Default

An intake might help a little but your stock intake shouldn't be holding you back at only around 300whp on the stock turbo. Psi?
06blksubwrx is offline   Reply With Quote
Old 01-15-2007, 11:19 AM   #3
oversteer
Scooby Newbie
 
Member#: 14923
Join Date: Feb 2002
Vehicle:
2007 Subaru turbo

Default

Quote:
Originally Posted by 06blksubwrx View Post
An intake might help a little but your stock intake shouldn't be holding you back at only around 300whp on the stock turbo. Psi?
19psi peak with the VF39.
oversteer is offline   Reply With Quote
Old 01-15-2007, 12:41 PM   #4
STi*guy.kiev
Scooby Newbie
 
Member#: 117854
Join Date: Jun 2006
Location: KIEV UKRAINE
Vehicle:
2003 spec c

Default

Quote:
Originally Posted by oversteer View Post
19psi peak with the VF39.
Should be 22psi...
STi*guy.kiev is offline   Reply With Quote
Old 01-15-2007, 12:51 PM   #5
CatfaceType-R
Scooby Guru
 
Member#: 81102
Join Date: Feb 2005
Chapter/Region: MWSOC
Location: I sell platinum cat jewelry.co
Default

^^^no it shouldn't, that would be a pretty agressive tune...on race gas it would be fine
CatfaceType-R is offline   Reply With Quote
Old 01-15-2007, 01:02 PM   #6
STi*guy.kiev
Scooby Newbie
 
Member#: 117854
Join Date: Jun 2006
Location: KIEV UKRAINE
Vehicle:
2003 spec c

Default

Quote:
Originally Posted by soon2bblackongold View Post
^^^no it shouldn't, that would be a pretty agressive tune...on race gas it would be fine
~11.3-11.4 AFR + 95% IDC = 300+whp (TBE catless, Walbro pump, EM)
STi*guy.kiev is offline   Reply With Quote
Old 01-15-2007, 01:43 PM   #7
CatfaceType-R
Scooby Guru
 
Member#: 81102
Join Date: Feb 2005
Chapter/Region: MWSOC
Location: I sell platinum cat jewelry.co
Default

that is a pretty agressive tune...while I am safe at 20psi, i'm not sure of my duty cycle but i know it's not close to full duty...i am at 255 whp on a mustang dyno (catless tbe, protuned)
CatfaceType-R is offline   Reply With Quote
Old 01-15-2007, 01:55 PM   #8
wrxxed
Scooby Specialist
 
Member#: 20567
Join Date: Jun 2002
Chapter/Region: Tri-State
Location: L.I,N.Y.
Vehicle:
04 STi
Sil/Sil

Default

each dyno reads differently,300 on one dyno may not be 300 on another
wrxxed is offline   Reply With Quote
Old 01-15-2007, 02:03 PM   #9
blowbyu24
Scooby Specialist
 
Member#: 84482
Join Date: Apr 2005
Chapter/Region: Tri-State
Location: PA / Element Tuning
Vehicle:
2005 STI.UR gt4088r
E85 pro comp sti

Default

well by the looks of it, if you want 300whp at stage II you should have waited and got a 07....pump gas on a 04-06 will only get you into the 290's, if your lucky....me 288whp on a warm day on a dyno jet
blowbyu24 is offline   Reply With Quote
Old 01-15-2007, 02:03 PM   #10
Unabomber
Big Ron
Moderator
 
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
Vehicle:
on car parts so PM
me b4 j00 buy

Default

Quote:
Originally Posted by wrxxed View Post
each dyno reads differently,300 on one dyno may not be 300 on another
This guy gets it....I like him!
Unabomber is offline   Reply With Quote
Old 01-15-2007, 02:03 PM   #11
Lit Fuse
Scooby Newbie
 
Member#: 81706
Join Date: Feb 2005
Location: St. Louis, Mo
Default

^^^yep. Take it to the track and see how your set-up does against other cars wih similar mods. I have learned that dyno readings are only about braggin' rights, nothing more.
Lit Fuse is offline   Reply With Quote
Old 01-15-2007, 02:03 PM   #12
Riight112
Scooby Newbie
 
Member#: 32071
Join Date: Jan 2003
Location: NorCal
Vehicle:
2004 WRX STi
WR Blue

Default

bigger injectors and fuel pump? maybe a stronger wastegate actuator?
Riight112 is offline   Reply With Quote
Old 01-15-2007, 02:05 PM   #13
oversteer
Scooby Newbie
 
Member#: 14923
Join Date: Feb 2002
Vehicle:
2007 Subaru turbo

Default

I know I know etc that all dynos read differently but to simplfy things has anyone made over 300whp with the stock airbox and a VF39 on pump gas?

My question isn't about how much boost I should run or other tuning questions but I want to find out if the stock box is holding me back and if the cold air intakes really add good power.
oversteer is offline   Reply With Quote
Old 01-15-2007, 02:27 PM   #14
blowbyu24
Scooby Specialist
 
Member#: 84482
Join Date: Apr 2005
Chapter/Region: Tri-State
Location: PA / Element Tuning
Vehicle:
2005 STI.UR gt4088r
E85 pro comp sti

Default

stock air box is not holding you back, just get a high flowing air filter, thats all you need at your power levels
blowbyu24 is offline   Reply With Quote
Old 01-15-2007, 02:55 PM   #15
Eskram
Scooby Newbie
 
Member#: 16697
Join Date: Mar 2002
Chapter/Region: South East
Vehicle:
2004 2.5 Hybrid 18g
Wagon + LGT 1-4 g00dness!

Default

Quote:
Originally Posted by blowbyu24 View Post
stock air box is not holding you back, just get a high flowing air filter, thats all you need at your power levels
I put down 275whp on a mustang dyno with the stock airbox and a cheap Fram filter.
Eskram is offline   Reply With Quote
Old 01-15-2007, 03:02 PM   #16
cwepruk
Scooby Newbie
 
Member#: 121757
Join Date: Aug 2006
Location: Edmonton, Alberta
Vehicle:
2005 Subaru Forester
White

Default

I too put down 270 HP, stock airbox, Kool Blue filter, no snorkel.

EJ255, VF39, STi I/C, protune, header, lower boost than I wanted (pill issues), Mustang dyno. Stage 2 STi typically put down 245 on this dyno. Boost was 15.5 spikeat 3200, then 14-13-12 in 1000 rpm increments or so.

I was curious too if there is any reason to buy an aftermarket turbo inlet.
cwepruk is offline   Reply With Quote
Old 01-15-2007, 04:48 PM   #17
wrxxed
Scooby Specialist
 
Member#: 20567
Join Date: Jun 2002
Chapter/Region: Tri-State
Location: L.I,N.Y.
Vehicle:
04 STi
Sil/Sil

Default

Clark Turner tuned my 04 sti and made 305awhp/328awtq on a dynojet,APS 3 inch catless TBE,everything else stock! Look at the Licthfield Type-25 with the stock airbox they made 415 bhp(with many other mods of coarse)so the stock air box is not holding you back!! I do believe at higher hp levels it will eventually not flow enough air but your not there yet. Prove it to yourself go buy a CAI and get retuned by the same tuner on the same dyno @ roughly the same air temps and humidity and see what happens?
wrxxed is offline   Reply With Quote
Old 01-15-2007, 05:03 PM   #18
WRX_UA
Scooby Newbie
 
Member#: 116189
Join Date: May 2006
Location: Ukraine, Kiev
Vehicle:
2006 WRX Wagon 2.5L
Very black with T518Z...

Default

Well, with stock injectors, they will be more of a limiting factor, not intake.
WRX_UA is offline   Reply With Quote
Old 01-15-2007, 05:24 PM   #19
oversteer
Scooby Newbie
 
Member#: 14923
Join Date: Feb 2002
Vehicle:
2007 Subaru turbo

Default

Quote:
Originally Posted by wrxxed View Post
Prove it to yourself go buy a CAI and get retuned by the same tuner on the same dyno @ roughly the same air temps and humidity and see what happens?
Excellent idea but since the USDM STi has been out for 3+ years I was hoping that someone already did this test
oversteer is offline   Reply With Quote
Old 01-15-2007, 05:48 PM   #20
sjs0433
Scooby Specialist
 
Member#: 86061
Join Date: Apr 2005
Chapter/Region: MAIC
Default

I have a friend that with only colder plugs, and turboback plus a tune made over 300whp on an 05 sti with the stock airbox
sjs0433 is offline   Reply With Quote
Old 01-15-2007, 08:00 PM   #21
CatfaceType-R
Scooby Guru
 
Member#: 81102
Join Date: Feb 2005
Chapter/Region: MWSOC
Location: I sell platinum cat jewelry.co
Default

oh yah i forgot, i am on stock airbox too
CatfaceType-R is offline   Reply With Quote
Old 01-15-2007, 11:34 PM   #22
Gruppe-S
Former Vendor
 
Member#: 23216
Join Date: Aug 2002
Location: Lake Forest, CA | 949-457-1234
Vehicle:
2006 949-457-1234
949-457-1234

Default

We did 312whp and 315ft/lbs on our Mustang with 91 octane on the stock intake and TMIC. This was with the Helix RR500 turbo running 21psi tapering to 17psi, the MAF resolution was terrible, the car was flowing about 315grams of air so I don't recommend it (shop car), but we were just pushing the limits of the turbo. Your problem is likely more the stock turbo than the intake.

Cheers,

Gary
Gruppe-S
Gruppe-S is offline   Reply With Quote
Old 01-16-2007, 11:39 PM   #23
RkyMtWy
Scooby Newbie
 
Member#: 137740
Join Date: Jan 2007
Default

I hit 305whp 345wtq on 91 at 5900 feet. This was on MAC's awd Mustang Dyno with the stock airbox, stock turbo, 3" TBE, Perrin drop in filter, lightened crank, COBB v.1, and the street tuner program. This was on my 2005 STi. Recently I added a turbo inlet and SPT intake and cruised to 314whp 352wtq! If you go that high a tune on the VF39, expect boost creep when it is cold.
RkyMtWy is offline   Reply With Quote
Old 01-17-2007, 12:14 AM   #24
Clark_Kent
Scooby Specialist
 
Member#: 114299
Join Date: May 2006
Chapter/Region: MAIC
Location: Smallville, KS
Default

Quote:
Originally Posted by RkyMtWy View Post
I hit 305whp 345wtq on 91 at 5900 feet. This was on MAC's awd Mustang Dyno with the stock airbox, stock turbo, 3" TBE, Perrin drop in filter, lightened crank, COBB v.1, and the street tuner program. This was on my 2005 STi. Recently I added a turbo inlet and SPT intake and cruised to 314whp 352wtq! If you go that high a tune on the VF39, expect boost creep when it is cold.
MAC in Parker? They don't have a Mustang dyno, its a DynoJet AWD 248/224.
Clark_Kent is offline   Reply With Quote
Old 01-17-2007, 01:33 AM   #25
dwaynesti
Scooby Newbie
 
Member#: 88838
Join Date: Jun 2005
Location: White Rock BC
Vehicle:
2004 sti
black

Default

i am sure my 20g is pushing over 300whp on most dyno's
stock airbox, stock filter even
dwaynesti 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
Anyone in the Chicago Suburbs want to sell their stock air intake? chomdh Mid West Subaru Owners Club Forum -- MWSOC 5 06-11-2008 10:54 PM
fs de. injen cold air and AEM shortram & stock air intakes blueghost Engine/Power/Exhaust 15 05-11-2007 10:43 AM
WTB: 02/03 WRX stock air intake or trade for Injen cold air intake limpstick VIC Private Classifieds 17 02-16-2007 02:46 AM
Replaced Ganzflow with Stock Air intake, MPG now in the hole DreddRS25 Normally Aspirated Powertrain 8 09-21-2006 07:08 PM
Anyone had problems with cold air intakes? subie4life Normally Aspirated Powertrain 47 08-01-2005 05:00 PM


All times are GMT -4. The time now is 06:39 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.