Welcome to the North American Subaru Impreza Owners Club Thursday April 17, 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

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 11-20-2011, 11:06 PM   #51
Schister66
Scooby Newbie
 
Member#: 271648
Join Date: Jan 2011
Location: Bloomington, MN
Vehicle:
2006 STi
Steel Grey Metallic (26D)

Default

With a proper tune and good maintenance, I hope 350awhp is reliable...If not, Subaru needs to do a little better job putting engines together. I know it's comparing apples to oranges, but its not uncommon to see stock 1.8L B series Hondas pushing 400whp on stock blocks...if they can do it with 2/3 the displacement and cast 10:1 or 11:1 pistons, i hope an STi can handle it.

Next winter my STi will be getting a few new toys and with ~100k on the clock, i'm looking for 380-400awhp on corn. I guess we shall see how it likes it
* Registered users of the site do not see these ads.
Schister66 is offline   Reply With Quote
Old 11-20-2011, 11:43 PM   #52
Bones Malone
Scooby Newbie
 
Member#: 301509
Join Date: Nov 2011
Default

Running 304whp on my '11 sti now with a solid tune. Going to run e85 soon on stock turbo. I think it would be a TAD safer to run e85 because e85 has somewhat of a cooling effect. I want to hit 340, hopefully motor will last!
Bones Malone is online now   Reply With Quote
Old 11-21-2011, 05:05 PM   #53
04furesterXT
Scooby Specialist
 
Member#: 73223
Join Date: Oct 2004
Chapter/Region: SCIC
Location: Los Angeles
Vehicle:
2009 STI

Default

Quote:
Originally Posted by Schister66 View Post
With a proper tune and good maintenance, I hope 350awhp is reliable...If not, Subaru needs to do a little better job putting engines together. I know it's comparing apples to oranges, but its not uncommon to see stock 1.8L B series Hondas pushing 400whp on stock blocks...if they can do it with 2/3 the displacement and cast 10:1 or 11:1 pistons, i hope an STi can handle it.

Next winter my STi will be getting a few new toys and with ~100k on the clock, i'm looking for 380-400awhp on corn. I guess we shall see how it likes it
LOL. Good luck.
04furesterXT is offline   Reply With Quote
Old 11-21-2011, 05:20 PM   #54
Schister66
Scooby Newbie
 
Member#: 271648
Join Date: Jan 2011
Location: Bloomington, MN
Vehicle:
2006 STi
Steel Grey Metallic (26D)

Default

Quote:
Originally Posted by 04furesterXT View Post
LOL. Good luck.
Thanks, but i doubt very much I will be needing it. Furthermore, if it can't handle it in stock form, its a pathetic car and will be moving down the line.

A stock STi makes roughly 240awhp...to ask 380awhp of it is about 160% of its intended stress/power. For comparison's sake, my turbo GSR made 364whp on the stock block whereas a stock non-turbo makes roughly 160whp. That's more than double and still nowhere near pushing it to the limit. Several of my friends have run into the 400whp range with nothing more than a stock B series Honda, E85 and a turbo setup. It isn't rocket science provided the OEM parts are quality and your tuner is competent.

Ive been building turbo Hondas for the past 5 years so it isn't my first time around the block, but I suppose not everything will translate directly from one manufacturer to the next. I guess we'll see how things turn out. For the record, my buddy Jon's 04 STi (with nearly 100k miles) is at 421awhp/420wtq with nothing more than a MAP 20G, E85 and a few simple bolt ons...there's a little proof that it can be done

Last edited by Schister66; 11-21-2011 at 05:25 PM.
Schister66 is offline   Reply With Quote
Old 11-21-2011, 05:24 PM   #55
Psychoreo
Scooby Guru
 
Member#: 79643
Join Date: Jan 2005
Chapter/Region: NESIC
Location: New Britain
Vehicle:
04 EJ207 Swapped
Mikey tuned 271whp/287wtq

Default

Quote:
Originally Posted by Schister66 View Post
Thanks, but i doubt very much I will be needing it. Furthermore, if it can't handle it in stock form, its a pathetic car and will be moving down the line.

A stock STi makes roughly 240awhp...to ask 380awhp of it is about 160% of its intended stress/power. For comparison's sake, my turbo GSR made 364whp on the stock block whereas a stock non-turbo makes roughly 160whp. That's more than double and still nowhere near pushing it to the limit. Several of my friends have run into the 400whp range with nothing more than a stock B series Honda, E85 and a turbo setup. It isn't rocket science provided the OEM parts are quality and your tuner is competent.
Inline engine =/= boxer engine


Completely different beast.
Psychoreo is offline   Reply With Quote
Old 11-21-2011, 05:29 PM   #56
Schister66
Scooby Newbie
 
Member#: 271648
Join Date: Jan 2011
Location: Bloomington, MN
Vehicle:
2006 STi
Steel Grey Metallic (26D)

Default

It seems to me that if a smaller displacement, higher compression, NA car can make 400+whp in stock form, then a larger disp., sub 9:1, built-for-FI engine should also be capable of that power. I guess i shouldnt generalize

Last edited by Schister66; 11-21-2011 at 06:16 PM.
Schister66 is offline   Reply With Quote
Old 11-21-2011, 05:39 PM   #57
04furesterXT
Scooby Specialist
 
Member#: 73223
Join Date: Oct 2004
Chapter/Region: SCIC
Location: Los Angeles
Vehicle:
2009 STI

Default

Quote:
Originally Posted by Schister66 View Post
Maybe this highlights my own ignorance for the way Subaru differs from other cars i've worked on.
It really does in more ways than you imagine.

Not sure why you need to come here and post your ridiculous calculations with your extensive experience?
04furesterXT is offline   Reply With Quote
Old 11-21-2011, 06:03 PM   #58
Schister66
Scooby Newbie
 
Member#: 271648
Join Date: Jan 2011
Location: Bloomington, MN
Vehicle:
2006 STi
Steel Grey Metallic (26D)

Default

Other than justifying my previous statements, which is what someone does in a debate, i guess i didnt have a reason. Thanks for being such a helpful ass by the way.

Not sure why you needed to come in here and be such a prick..? Other than snuffing my ideas, it doesn't seem you've contributed anything to this, but thanks for trying

Last edited by Schister66; 11-21-2011 at 06:11 PM.
Schister66 is offline   Reply With Quote
Old 11-21-2011, 06:56 PM   #59
04furesterXT
Scooby Specialist
 
Member#: 73223
Join Date: Oct 2004
Chapter/Region: SCIC
Location: Los Angeles
Vehicle:
2009 STI

Default

I was trying to keep you from ****ing yourself but it appears you have your small mind made up and your arrogance will assure that.

Sadly you're too ignorant to catch on still...
04furesterXT is offline   Reply With Quote
Old 11-21-2011, 07:45 PM   #60
Schister66
Scooby Newbie
 
Member#: 271648
Join Date: Jan 2011
Location: Bloomington, MN
Vehicle:
2006 STi
Steel Grey Metallic (26D)

Default

Thank you for your judgement of me based on a few posts. If you were able to give me some logical reasoning in contrast to my point, I would have listened. Instead, you took the juvenile route and called me names. Glad to see you're capable of behaving like an adult and having a discussion. Grow up
Schister66 is offline   Reply With Quote
Old 11-21-2011, 10:40 PM   #61
04furesterXT
Scooby Specialist
 
Member#: 73223
Join Date: Oct 2004
Chapter/Region: SCIC
Location: Los Angeles
Vehicle:
2009 STI

Default

Actually I only needed your first post to see you couldn't comprehend the over twenty logical posts before yours so you decided to post idiotic rationalizations about other cars. Genius.
04furesterXT is offline   Reply With Quote
Old 11-21-2011, 11:40 PM   #62
le0nard
Scooby Newbie
 
Member#: 281927
Join Date: May 2011
Chapter/Region: MAIC
Location: Newport News, VA
Vehicle:
2010 WRX Sti
WRB

Default

lol...
le0nard is offline   Reply With Quote
Old 11-21-2011, 11:59 PM   #63
NSFW
Scooby Guru
 
Member#: 140444
Join Date: Feb 2007
Chapter/Region: NWIC
Location: Near Seattle, WA
Vehicle:
05 Stage Free LGT
ATP 3076, 6MT, AVO FMIC

Default

Welcome to NASIOC.
NSFW is offline   Reply With Quote
Old 11-22-2011, 12:45 AM   #64
Schister66
Scooby Newbie
 
Member#: 271648
Join Date: Jan 2011
Location: Bloomington, MN
Vehicle:
2006 STi
Steel Grey Metallic (26D)

Default

Quote:
Originally Posted by 04furesterXT View Post
Actually I only needed your first post to see you couldn't comprehend the over twenty logical posts before yours so you decided to post idiotic rationalizations about other cars. Genius.
Again, you're deflecting. You have yet to post anything to prove me wrong. I'm glad you laugh at my goals, but rather than being a condescending ass, you could have maybe posted something helpful/useful and said they're only reliable to a point, say 350whp or whatever.

Quote:
Originally Posted by NSFW View Post
Welcome to NASIOC.
...where all people do is bash each other since no one has anything useful to post.

Thanks for the warm welcome. Its good to see my Newbie status has erased all hope of credibility.

Last edited by Schister66; 11-22-2011 at 12:52 AM.
Schister66 is offline   Reply With Quote
Old 11-22-2011, 04:15 AM   #65
FRWRX
Scooby Newbie
 
Member#: 15306
Join Date: Feb 2002
Location: FRANCE
Vehicle:
2011 STi
White pearl

Default

To be very clear, 300+whp on stock EJ257 engine is definately unreliable for someone doing trackdays or rallying (let's say 4 to 10 times a year). We are a bunch of guys here having experienced pistons ringland failure and/or head gasket failure with stock/stage 1/stage 2 MY2009 to 2011 STis. Happens in a period between 5kmiles to 30kmiles.
FRWRX is offline   Reply With Quote
Old 11-22-2011, 09:31 AM   #66
Schister66
Scooby Newbie
 
Member#: 271648
Join Date: Jan 2011
Location: Bloomington, MN
Vehicle:
2006 STi
Steel Grey Metallic (26D)

Default

^^Now that's helpful. When do people start seeing ringland failure? Thats a failure i'm all too familiar with. Its the stock Honda curse...cast ringlands FTL. As for the HG failure, does anyone upgrade head studs to ARPs before boosting higher than stock? I'm not sure if that's a industry-wide thing or not...
Schister66 is offline   Reply With Quote
Old 11-22-2011, 09:34 AM   #67
Psychoreo
Scooby Guru
 
Member#: 79643
Join Date: Jan 2005
Chapter/Region: NESIC
Location: New Britain
Vehicle:
04 EJ207 Swapped
Mikey tuned 271whp/287wtq

Default

Quote:
Originally Posted by Schister66
As for the HG failure, does anyone upgrade head studs to ARPs before boosting higher than stock? I'm not sure if that's a industry-wide thing or not...
No one that I know of, unless they're putting in forged pistons/building the engine.

The studs/head bolts aren't the issue, proper cooling is.

EDIT: until you start getting into significantly higher boost pressures. Stock/stage2 aren't an issue.
Psychoreo is offline   Reply With Quote
Old 11-22-2011, 09:35 AM   #68
Schister66
Scooby Newbie
 
Member#: 271648
Join Date: Jan 2011
Location: Bloomington, MN
Vehicle:
2006 STi
Steel Grey Metallic (26D)

Default

^^Good to know. Thanks
Schister66 is offline   Reply With Quote
Old 11-22-2011, 11:23 AM   #69
aznboi0204
Scooby Newbie
 
Member#: 266514
Join Date: Dec 2010
Chapter/Region: MAIC
Location: Maryland
Vehicle:
2011 OBP STi Sedan
OBP

Default

I had my car dyno'd stock vs just a tune on stock and it went from about 264hp/280tq to 286.0hp/292.4tq. Would adding intake, EBCS, upping the boost to 19-20 psi, and tune be a concern for any failure?
aznboi0204 is offline   Reply With Quote
Old 11-22-2011, 11:40 AM   #70
Schister66
Scooby Newbie
 
Member#: 271648
Join Date: Jan 2011
Location: Bloomington, MN
Vehicle:
2006 STi
Steel Grey Metallic (26D)

Default

As long as the tune is good and you're not exceeding the limits of the fuel you're using, i can't see why it would be a problem. My STi is pretty much exactly what you just listed: Intake, 4" bellmouth dp, 3" catless Invidia exhaust, Grimmspeed EBC at 21psi, stock VF39 and a retune. It runs like a champ.
Schister66 is offline   Reply With Quote
Old 11-22-2011, 11:50 AM   #71
Psychoreo
Scooby Guru
 
Member#: 79643
Join Date: Jan 2005
Chapter/Region: NESIC
Location: New Britain
Vehicle:
04 EJ207 Swapped
Mikey tuned 271whp/287wtq

Default

Quote:
Originally Posted by aznboi0204
I had my car dyno'd stock vs just a tune on stock and it went from about 264hp/280tq to 286.0hp/292.4tq. Would adding intake, EBCS, upping the boost to 19-20 psi, and tune be a concern for any failure?
Ask your tuner.
Psychoreo is offline   Reply With Quote
Old 11-22-2011, 11:51 AM   #72
STiSomeday
Scooby Specialist
 
Member#: 265430
Join Date: Nov 2010
Chapter/Region: MWSOC
Location: NE Ohio
Vehicle:
2005 OBP WRX STi
2002 PSM WRX - DD

Default

So excuse my nooblieness but what exactly constitutes a "built block?" Forged pistons and what else?
STiSomeday is offline   Reply With Quote
Old 11-22-2011, 11:53 AM   #73
Psychoreo
Scooby Guru
 
Member#: 79643
Join Date: Jan 2005
Chapter/Region: NESIC
Location: New Britain
Vehicle:
04 EJ207 Swapped
Mikey tuned 271whp/287wtq

Default

Quote:
Originally Posted by STiSomeday
So excuse my nooblieness but what exactly constitutes a "built block?" Forged pistons and what else?
Basic: pistons, rods, bearings.
Complicated: the above with head work, valves, springs, retainers, cams, o ringed bores, etc.
Psychoreo is offline   Reply With Quote
Old 11-22-2011, 01:12 PM   #74
FRWRX
Scooby Newbie
 
Member#: 15306
Join Date: Feb 2002
Location: FRANCE
Vehicle:
2011 STi
White pearl

Default

Again, if you are having trackdays or doing Rally with the stock engine, stock tune or good aftermarket tune, it will be an issue. It won't take more than 8 to 15 trackdays to fail (imagine this is less than 2kmiles on track, so it doesn't last long). A soft and good tune won't sort out the problem at all. I've not seen any 2.5L scooby that last more than that on track.
If you're using your car for daily driving only, even driven hard for a few miles on some occasion, then it won't be an issue until at least 50kmiles (some have more than 100kmiles without any pb) even with a good stage 2 tune.

So basically it is a question of what you're using your car for

At the opposite, the stock 2L STi engine is rock solid up to 380whp

Last edited by FRWRX; 11-22-2011 at 01:19 PM.
FRWRX is offline   Reply With Quote
Old 11-29-2011, 11:24 AM   #75
Scoobert
Scooby Newbie
 
Member#: 301823
Join Date: Nov 2011
Chapter/Region: MAIC
Location: Yorktown, VA
Vehicle:
2004 STi
Java Black Pearl

Default

^ he's right
Scoobert 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
Can 400+ whp be safer than 350 whp? drfrink24 Factory 2.5L Turbo Powertrain 22 01-24-2008 02:47 AM
Most reliable way to reach 300 - 350 whp on a STi? trail*of*dead Factory 2.5L Turbo Powertrain 16 09-15-2004 02:25 PM
Over 350 whp on stock ecu? WRC WRX Factory 2.0L Turbo Powertrain 9 12-16-2002 03:49 AM
what is needed for at least 350 whp WRX IS HOT Factory 2.0L Turbo Powertrain 2 10-28-2002 09:46 AM
So If Im going to push 350 WHP?? EneMy X Transmission (AT/MT) & Driveline 17 01-29-2002 08:31 PM


All times are GMT -4. The time now is 05:16 PM.


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.