Welcome to the North American Subaru Impreza Owners Club Monday December 22, 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 11-09-2005, 09:25 PM   #1
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default Selling 02 WRX STG4+FMIC, buy 04 STI?

I've got a vf30 wrx w/ fmic, 785s and tuned on pump gas at ~18.5psi, pretty happy with it but its getting older and it's most likely sold saturday...

if i pick up a sti and do a reflash & tbe is it going to be as powerful and fast as my current car? think i'll be happy?

(ultimately looking for big power with light mods this time around)

also, has anyone broke a 6spd driveline yet? can i pretty much drive it hard as i want with the above mods and not worry about it whatsoever? (i've never been able to REALLY drive my wrx for fear of gear failure)
* Registered users of the site do not see these ads.
overdose is offline   Reply With Quote
Old 11-09-2005, 10:12 PM   #2
kedrin
Scooby Specialist
 
Member#: 48380
Join Date: Nov 2003
Default

6 spd drivelines have been broken many times. if you wanna truly drive it like you own it, check with your dealer to see what say about tbe exhaust and wether they would give you hell about it if you say blew a gear.

but all in all if you wanna drive it like you own it, keep it stock.


what whp did you lay down with your old setup?

sti+tbe+tune=300whp on certain dynos, on others its lower.
kedrin is offline   Reply With Quote
Old 11-09-2005, 10:31 PM   #3
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default

i didn't have the car strapped down to the dyno, it was road tuned, but i like the top end... a whoooooooole lot, my buddy has an 05 sti with just TBE and stock ecu so i haven't been in one with a retune, but my car is DISGUSTINGLY faster than his.... i'd hope for the same if he had a reflash
overdose is offline   Reply With Quote
Old 11-09-2005, 11:24 PM   #4
Capt Crunch
Scooby Guru
 
Member#: 10852
Join Date: Oct 2001
Chapter/Region: MAIC
Location: Cleveland / UMD College Park
Vehicle:
Then : JDM Ver 7 STi
Now : E46 M3 / MKVI GTI

Default

kedrin - I have very rarely heard of a 6-speed busting. Cars with GT35Rs all use the stock 6-speed with impunity.

I think at the very least at stock turbo levels you can do pretty much whatever you want to the tranny short of banging gears without a clutch.
Capt Crunch is offline   Reply With Quote
Old 11-10-2005, 12:52 PM   #5
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default

no more input on this?

rather than store the wrx through winter like i did and drive a beater, my goal is to drive the sti year round w/ all seasons in the winter but i want similar performance to my stg4 car, yet not rely on a beater through winter and keep the RX-7 as a weekend car / project car (just tbe & reflash on the sti)
overdose is offline   Reply With Quote
Old 11-10-2005, 01:31 PM   #6
kedrin
Scooby Specialist
 
Member#: 48380
Join Date: Nov 2003
Default

Quote:
Originally Posted by Capt Crunch
kedrin - I have very rarely heard of a 6-speed busting. Cars with GT35Rs all use the stock 6-speed with impunity.

I think at the very least at stock turbo levels you can do pretty much whatever you want to the tranny short of banging gears without a clutch.
its true they are very strong. There are still many cases where they have been broken. I wasnt trying to imply that they are weak, but merely that they do break and it does happen. I think alot of why there are broken 6spds is because of ppl driving it like a madman with no care for the car at all.
kedrin is offline   Reply With Quote
Old 11-10-2005, 01:33 PM   #7
kedrin
Scooby Specialist
 
Member#: 48380
Join Date: Nov 2003
Default

Quote:
Originally Posted by overdose
no more input on this?

rather than store the wrx through winter like i did and drive a beater, my goal is to drive the sti year round w/ all seasons in the winter but i want similar performance to my stg4 car, yet not rely on a beater through winter and keep the RX-7 as a weekend car / project car (just tbe & reflash on the sti)
any chance of xferring some of those parts to your sti or are you selling your wrx as a whole?

toss on some exhaust/ecu and you are pretty close if not past alot of stg4 set ups.
kedrin is offline   Reply With Quote
Old 11-10-2005, 02:41 PM   #8
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default

yeah car's sold and i'm starting over, juts plan to do a reflash and tbe soon when i find "my" new sti
overdose is offline   Reply With Quote
Old 11-10-2005, 04:28 PM   #9
drees
Scooby Specialist
 
Member#: 25905
Join Date: Oct 2002
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2003 Silver Wagon
Tuned with Enginuity

Default

Reflash and TBE will be a good start with the STI. Some alky injection and tuning will get you close to your HP goals as well.
drees is offline   Reply With Quote
Old 11-10-2005, 04:32 PM   #10
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default

can't expect same power with just tbe/reflash though?
overdose is offline   Reply With Quote
Old 11-10-2005, 04:44 PM   #11
drees
Scooby Specialist
 
Member#: 25905
Join Date: Oct 2002
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2003 Silver Wagon
Tuned with Enginuity

Default

Hmm, don't know, but check out these dyno plots from I-speed:

WRX VF30
STi TBE

The WRX VF30 put down about 300hp over 5800rpm.
The STi TBE put down over 300hp from 4500rpm+.

So it looks like they will be fairly close. All of I-speed's WRX VF series tunes put down similar power as well as their STi TBE tunes.

I-speed has a lot more dyno charts here: http://www.i-speed.us/dyno_results/db_cat.cgi
drees is offline   Reply With Quote
Old 11-10-2005, 04:49 PM   #12
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default

my 02 had a fmic not sure how much difference it made but it pulled like a freight train 5000+rpm to redline in every gear, hoping for the same here with less work
overdose is offline   Reply With Quote
Old 11-10-2005, 05:06 PM   #13
TurboRex
Scooby Specialist
 
Member#: 8635
Join Date: Jul 2001
Location: Texas
Vehicle:
04 STI, 07 FXT

Default

I found the sti will perform very close to the wrx with the same mods. It mainly depends on the turbo which is the limiting factor. For instance, I transferred all my wrx parts to my sti (fp 20g, tmic, exhaust, etc.) and it had about the same accelaration. I had hoped for more but it makes sense because the turbo is maxed out.

Greg
TurboRex is offline   Reply With Quote
Old 11-10-2005, 05:13 PM   #14
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default

well i guess my concern was obviously i'm going to get a lot more torque with the 2.5 and although it's a VF39 said to be slightly smaller on the compressor side, that overall it would perform as my previous setup (which is fine)... what 1/4 mile times and trap speeds are STI + reflash/tbe's going?
overdose is offline   Reply With Quote
Old 11-10-2005, 06:14 PM   #15
kedrin
Scooby Specialist
 
Member#: 48380
Join Date: Nov 2003
Default

an sti with just tbe and reflash is going to be extremely close to a stg4 wrx + or - .

you wont be disappointed.
kedrin is offline   Reply With Quote
Old 11-10-2005, 06:29 PM   #16
drees
Scooby Specialist
 
Member#: 25905
Join Date: Oct 2002
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2003 Silver Wagon
Tuned with Enginuity

Default

Quote:
Originally Posted by overdose
my 02 had a fmic not sure how much difference it made but it pulled like a freight train 5000+rpm to redline in every gear, hoping for the same here with less work
TBE + FMIC looks to be a good combo as well judging by the dyno charts on I-speed's site.
drees is offline   Reply With Quote
Old 11-11-2005, 12:20 AM   #17
ravi
Scooby Specialist
 
Member#: 37597
Join Date: May 2003
Location: charleston, sc
Vehicle:
2004 STi w/fp green

Default

i traded my 03 stage 4 fmic with vf30 for an 04 sti... its great, torque is your new friend... of course the mod bug is still present. waiting to install a green now
ravi is offline   Reply With Quote
Old 11-11-2005, 04:50 AM   #18
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default

maybe i need to wait till spring, just seems like everyone is down to take a hit on selling a sti right now hmm
overdose is offline   Reply With Quote
Old 11-11-2005, 08:59 AM   #19
Davenow
Scooby Guru
 
Member#: 23676
Join Date: Aug 2002
Chapter/Region: NESIC
Location: de_dust and Orgrimar
Vehicle:
.

Default

I had 309whp in my WRX. I ran 12.7@107.89mph with a crap launch.
I had thousands into suspension work.


My 05 STI was faster in every situation other than 1/4 mile BONE STOCK. WIth a TBE and EM it was significantly faster everywhere. Bone stock it outhandles what my wrx did by a mile. With a set of Cobb sways it is no contest.
Davenow is offline   Reply With Quote
Old 11-11-2005, 10:24 AM   #20
ChrisF
Scooby Specialist
 
Member#: 12295
Join Date: Nov 2001
Chapter/Region: SCIC
Location: Marin, CA
Default

Also had a VF30'd 02 wagon before my STi. While my wagon was fast, the STi felt pretty close stock. With EM and a TBE it felt a LOT better. Don't discount low end torque and an extra .5L. The HP may be similar, but the driving experience is different. Roll on throttle at 2500 and WHOA! WRX? Waiting, waiting, waiting...WHOA! The STi's powerband is much more useable in daily driving.

As far as every other performance measure, the STI destroys my WRX. I am VERY happy with the upgrade. Funniest part is I said I would never mod the STI. Right.
ChrisF is offline   Reply With Quote
Old 11-11-2005, 10:51 AM   #21
Freon
Scooby Specialist
 
Member#: 88322
Join Date: Jun 2005
Chapter/Region: MWSOC
Location: Indianapolis, IN
Vehicle:
2009 BMW 135i

Default

Switching over to the STI gets you a lot of stuff you'd probably never bother with besides the obvious 6-speed and 2.5L engine. Aluminum control arms, Brembos, better steering rack, BBS wheels (16 lbs!), RE070's, (arguably) better seats, DCCD, R180 rearend, front LSD, and so on. It's a better starting platform.

The STI won't pull all the way to redline like your 'Rex, but it likely won't matter. Shift around 6000-6500. Your powerband will still be plenty wide.
Freon is offline   Reply With Quote
Old 11-11-2005, 11:22 AM   #22
TurboRex
Scooby Specialist
 
Member#: 8635
Join Date: Jul 2001
Location: Texas
Vehicle:
04 STI, 07 FXT

Default

Chris makes a good point.

According to my logs, my wrx had the same acceleration from 5k to 6.5k as my sti with the same mods. However, you need to consider gearing and the fun to drive factor. I would easily choose the sti.

Greg
TurboRex is offline   Reply With Quote
Old 11-11-2005, 11:32 AM   #23
ChrisF
Scooby Specialist
 
Member#: 12295
Join Date: Nov 2001
Chapter/Region: SCIC
Location: Marin, CA
Default

Funny situation for me: I just recently upgraded to a DB 20g. Now contrary to what a lot of people say, the spoolup is NOT the same as the VF39. It's close, but not as quick. What it does do is give you a very solid powerband that pulls hard from 3400 - redline which the VF39 could not do. At first, I hated it. I had gotten so used to the early quick spool that it seemed primitive by comparison. After driving it for a week, I remembered how much fun having a car that pulls hard to redline is.

So, my point? Both the WRX and STi have very different, but very FUN powerbands. I would be happy driving either or a hybrid of both...more commonly known as a 20g STi.
ChrisF is offline   Reply With Quote
Old 11-11-2005, 02:45 PM   #24
TurboRex
Scooby Specialist
 
Member#: 8635
Join Date: Jul 2001
Location: Texas
Vehicle:
04 STI, 07 FXT

Default

I just upgraded to a red so a 20g seems like a low end torque monster to me. I am still tuning but I definitely like it. Right now I hit boost 400rpm later than the 20g but when it spools it pulls well to redline. I say the 20g is the best overall turbo for an sti. However, if you are mainly into drag racing, it just can't flow enough air on the top end.


Greg
TurboRex is offline   Reply With Quote
Old 11-11-2005, 06:40 PM   #25
SilverSurfer04STi
Scooby Specialist
 
Member#: 71542
Join Date: Sep 2004
Chapter/Region: MWSOC
Location: Midwest
Vehicle:
2013 WRB BRZ

Default

TurboRex, I agree. I have a DB 20G on my STi and the turbo feels so good on the car it should have come from the factory like this imho.

Overdose, I haven't drove a stg4 WRX, but I can say with a TBE and a cobb stg II off the shelf map, my STi was super torquey down low and in the mid range with OK top end (much better than stock though). I cannot imagine anybody not liking a setup like that. It might take an adjustment period for you to get used to it, but I bet you would love it once you got used to it.
SilverSurfer04STi 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
02 wrx ECU plug into 04 sti harness? Loomin Electrical & Lighting 1 11-25-2008 04:14 PM
02 wrx radio harness with 04 sti WRXDrUnKiE Car Audio, Video & Security 2 03-01-2007 02:08 PM
How do I install an 02 WRX stereo in an 04 STi? adrive43 Car Audio, Video & Security 6 08-24-2005 12:47 AM
02 WRX interior WTT for 04 STi door cards & rear seat MonoSki Private 'For Sale' Classifieds 0 05-26-2005 01:22 PM
02 WRX steering wheel on 04 STI not plug and play kenchan Car Part Reviews 1 02-02-2004 12:40 PM


All times are GMT -4. The time now is 02:09 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.