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Old 01-25-2010, 04:03 PM   #1
Ronnzi
Scooby Newbie
 
Member#: 99385
Join Date: Oct 2005
Chapter/Region: MWSOC
Location: Wichita, KS
Vehicle:
2005 WRX
Built EJ257 FP Green 4EAT

Default Now that I have a fully-built 4EAT, what next on my stock ej205?

My 2005 4EAT WRX currently has a TD05 18G (7cm) installed with the following supporting power mods (among others):

- 750cc modded-stock injectors and 255ltr Walbro FP
- SSAC FMIC (with shortram intake and BOV)
- APS turbo inlet
- Perrin EBCS
- TGV delete
- catless up, 3 inch catless down and catback

Besides going EWG and upgrading my headers, I've done about everything besides cams and building up the motor itself. I also haven't touched the differentials, besides putting in sythetic fluids. Though this car has not been dyno'd, if I were to guess, I would think it's somewhere around 250-280whp (based on what I've read about 4EATs with similar mods).

That's all for background purposes - while for 2 years or so my 4EAT transmission held up with a modded Protorque TC, IPT valvebody mod, and a cooler, it started slipping while shifting from first to second this past summer.

In a couple of days, I should have my car back with a fully-built IPT transmission. Now that the transmission's no longer the weak-link of my car, considering I spent so much on the build, I now want to try to make some more power.

What is the best course of action to take? Lag doesn't bother me for daily driving within reason - nothing done to my car thus far has bothered me even in the slightest. Boost with my 18G comes on around 3,500 rpm's andI feel I wouldn't mind a power band that's 500 rpm's or so further to the right.

My car currently runs 93 oct. fuel. I haven't gone with meth injection because in the event of a failure, I'm not confident I would be able to fix any problems and I'm not always close to a tuner.

Fueling is one of my main concerns with upgrading my turbo on the stock ej205 - would I even be able to make much more power with a larger turbo than an 18G on pump gas? Would simply going EWG with EL headers bring me similar gains without the added lag?

In terms of larger turbos, the ones I was contemplating are the following:
- TD05h 20G (8cm)
- TD06h 20G (8cm)
- FP Green (HTA or the older model)
- Blouch Dominator 2.5R

So I guess my two main questions are as follows:

1. Will these turbos make an appreciable amount of more power on my stock 2.0 motor on pump fuel? Should other mods be taken before looking at the turbo?

2. Furthermore, will my stock motor be able to handle a larger turbo/more power than I'm currently making?

Keep in mind I have the built 4EAT. The automatic brings with it greater drivetrain losses and I'm hoping to make 350whp or so - if that's possible given such a setup. I know how to search and I have asked a similar question in the past, however I didn't have the built-transmission at that time and most threads of this nature are not 4EAT-specific.

I'm primarily looking for users with 4EAT experience to comment, particularly from those with the IPT built unit.

Thanks in advance.
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Old 01-25-2010, 08:23 PM   #2
andrew3776
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Member#: 172133
Join Date: Feb 2008
Chapter/Region: NESIC
Location: Holyoke Mass
Vehicle:
2003 vfdirty wrx
rotten banana

Default

Why dont you save your money and do some internals. Cam's arent cheap, but from what i've heard its a great upgrade.
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Old 01-26-2010, 05:58 PM   #3
GLD247
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Member#: 207789
Join Date: Apr 2009
Chapter/Region: MWSOC
Location: Illinois, MG
Vehicle:
2003 WRX EJ257 Swap
WRB

Default

isnt the automatic electronically limited to like 135?


OT: how do you like your auto over a 5speed? im considering a auto over the 5speed. and wanted to see how they compare.
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Old 01-27-2010, 11:52 AM   #4
Arthrogrian19
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Member#: 155466
Join Date: Jul 2007
Chapter/Region: NWIC
Location: NW Portland, OR
Vehicle:
2008 Stg III+ FSXT

Default

This nicely sums up the 4EAT.

Quote:
Stage 2 WRX 5MT VS Stage 2 WRX 4eat = riiiiiiiiight

Stage 2 WRX 5MT VS Stage 1 WRX 4EAT with a TQ converter=

Combine a TQ converter and valve body upgrade and the 4EAT will demolish the 5MT mod for mod. Not even a contest.
So, if you plan on modding and have relatively deep pockets, the 4EAT can be made into quite the monster.
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Old 01-27-2010, 11:57 AM   #5
Arthrogrian19
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Member#: 155466
Join Date: Jul 2007
Chapter/Region: NWIC
Location: NW Portland, OR
Vehicle:
2008 Stg III+ FSXT

Default

Here's some more good info on the performance differences between the 4eat and the 5mt.

http://www.subaruforester.org/vbulle...al-time-56714/
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Old 01-27-2010, 11:14 PM   #6
acheung
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Member#: 118389
Join Date: Jun 2006
Default

if you have a lot of backup money, go bigger with the turbo. Maybe a stock location atp 3071? You will probably end up blowing your engine with all that power, depending on how much mileage you have already and how hard you drive it. Although there are some pretty big turbos on stock 2.0L still around.
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Old 01-28-2010, 06:19 PM   #7
Zilvisbl
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Member#: 222474
Join Date: Sep 2009
Chapter/Region: Tri-State
Location: New Jersey
Vehicle:
2002 Impreza WRX
Silver

Default

yea that was going to be my next upgrade i was goin to put an sti turbo and injectors in but i wasnt sure if my transmission is gonna hold that and here i go my transmission blew last nite... subie down... now i need a new tranny
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Old 01-29-2010, 07:13 PM   #8
acheung
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Member#: 118389
Join Date: Jun 2006
Default

Quote:
Originally Posted by Zilvisbl View Post
yea that was going to be my next upgrade i was goin to put an sti turbo and injectors in but i wasnt sure if my transmission is gonna hold that and here i go my transmission blew last nite... subie down... now i need a new tranny

your 4eat should definitely be able to hold the power generated from an sti turbo and injector upgrade!.... are you sure there wasn't anything wrong with it to begin with?
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Old 01-29-2010, 07:43 PM   #9
Furious George
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Member#: 109742
Join Date: Mar 2006
Chapter/Region: MAIC
Location: PHL
Vehicle:
2002 WRX
MBP

Default

My 0.02:

I like smooth power delivery and as little lag as possible. If I were in your shoes, I would pick up

1. PnP stock exhaust elbows and an upgraded X pipe (you know the vendors)
2. PnP TB and intake manifold (you know the vendors)
3. Lightened crank pully

Those three mods and a tune may only net you a 10-20 whp increase, but IMO it rounds out the DD setup you have quite nicely. I did #1 and #3, (on my RA geared 5mt) and I am very happy with the change in throttle response and mild fun driving characteristics.
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