Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

Upgrading 07 wrx to sti turbo

Thread Tools
 
Search this Thread
 
Old 01-08-2009, 02:18 PM
  #1  
Registered User
Thread Starter
iTrader: (9)
 
415er's Avatar
 
Join Date: Jun 2007
Location: SF
Posts: 373
Car Info: 2013 WR Blue Pearl WRX Limited
Upgrading 07 wrx to sti turbo

so i was reading a turbo thread on nasioc, it says that for a vf43, 02-05 wrx's will need fuel upgrades. does that mean that 06-07's dont need fuel upgrades since they are all ready 2.5L?

if this is not true, what would i need to upgrade my 07 wrx to an sti turbo?

current mods: turbo xs TBE, Cobb AP v2


Last edited by 415er; 01-08-2009 at 02:42 PM.
415er is offline  
Old 01-08-2009, 02:21 PM
  #2  
Registered User
iTrader: (2)
 
JArnaud's Avatar
 
Join Date: Oct 2006
Location: Bay Area, CA
Posts: 1,090
Car Info: 2002 Subaru WRX PSM
You should get an STI TMIC at least
JArnaud is offline  
Old 01-09-2009, 12:59 PM
  #3  
Registered User
iTrader: (5)
 
1sicwrx's Avatar
 
Join Date: Jul 2005
Location: Novato,CA
Posts: 881
Car Info: Jaguar XJR, VW Corrado, 911 Carrera
Originally Posted by 415er
so i was reading a turbo thread on nasioc, it says that for a vf43, 02-05 wrx's will need fuel upgrades. does that mean that 06-07's dont need fuel upgrades since they are all ready 2.5L?

if this is not true, what would i need to upgrade my 07 wrx to an sti turbo?

current mods: turbo xs TBE, Cobb AP v2

To a certain extent... The 2.5l WRX motor has injectors that can handle a turbo up to the size of an 18g so it's not completely necessary to upgrade the injectors unless you want go to a bigger turbo than the 18g one day. You will need a Walbro 255lph fuel pump, a protune and an upgraded intercooler to run a VF series turbo. If it were me, I would install the above along with a Prodrive Boost Control Solenoid to get rid of the crappy two port BCS.
1sicwrx is offline  
Old 01-25-2009, 04:58 PM
  #4  
Registered User
iTrader: (5)
 
soobedup's Avatar
 
Join Date: Jan 2009
Location: Milpitas, CA
Posts: 144
Car Info: WRX wagon 2006
I also own the 2.5L engine on mine. From all the reading and research, I would change out the Top Mount Intercooler, maybe Walbro 255lph Fuel Pump. It really depends the turbo your upgrading to, just as 1sicwrx said. The stock fuel injectors on the 06-07 WRX has approximately 550cc stock injectors installed already.
soobedup is offline  
Old 01-26-2009, 12:40 AM
  #5  
banned
iTrader: (7)
 
Woodward's Avatar
 
Join Date: Apr 2006
Location: Delhi, CA
Posts: 1,864
Car Info: 2006 Subaru Impreza WRX TR
I went VF39 a couple years ago. I did SSAC TMIC (larger top-mount, STI will work), Walbro FP, TUNE, and I think that was it...

After tuning the WGDCs for boost, I'd def. recommend a 3-port boost solenoid when tuning.

A 3-port BCS will drop your WGDC ~30% though, so I'd say bring it to your tuner and have it installed right before the tune. You really dont want to overboost!
Woodward is offline  
Old 02-10-2009, 11:36 PM
  #6  
banned
iTrader: (5)
 
Lboogie's Avatar
 
Join Date: Jan 2008
Location: NorCal, SF East Bay
Posts: 1,456
Car Info: 2007 WRX Limited | vf43'D
I upgraded to a VF43, other things you'll need include a better TMIC (I got the STi one) and a tune via your Cobb AP.

If you get a VF39, yo ucan run the Cobb maps from their website. For something like the VF43, I went with an e-tune from Clark Turner. For $150 he sends you a base map and thus far I'm into a 2nd revision of the tune. You datalog on the AP and send him the logs for analysis/map tweaking.

The VF43 makes so much more usable power than the TD04, its not even funny. My mileage is still about 23mpg if not BETTER at times. And best of all, everything from the turbo up is factory hardware.
Lboogie is offline  
Old 02-10-2009, 11:38 PM
  #7  
Registered User
iTrader: (6)
 
04caliwrx's Avatar
 
Join Date: Mar 2006
Location: on the way to lake tahoe to shread! turbo beast
Posts: 9,581
Car Info: 2016 WRX, 2014 lifter forester XT, 2005 JDM207 WGN
go big or go home, get a sti tmic with a 20g and be happy with it lol
04caliwrx is offline  
Old 02-11-2009, 05:29 PM
  #8  
Former Sponsor
iTrader: (14)
 
GST Motorsports's Avatar
 
Join Date: Sep 2006
Location: Hayward, CA
Posts: 3,246
Car Info: WRX, EVO, MSP3
You would want to run a bigger TMIC, I would recommend the STI one for this (JDM if you can get it) and a Walbro fuel pump. Obviously a tune to top it all off.

Mike
GST Motorsports is offline  
Old 02-14-2009, 11:26 PM
  #9  
Registered User
iTrader: (11)
 
subie OCD's Avatar
 
Join Date: Aug 2005
Location: Concord
Posts: 5,808
Car Info: 04 STi
Bigger intercooler, fuel pump, exhaust and custom tune at the minimum. Find a tuner and go with their advice.
subie OCD is offline  
Old 02-15-2009, 08:17 AM
  #10  
Registered User
Thread Starter
iTrader: (9)
 
415er's Avatar
 
Join Date: Jun 2007
Location: SF
Posts: 373
Car Info: 2013 WR Blue Pearl WRX Limited
ok thanks, but i already got the answer from post 3.
415er is offline  
Old 02-22-2009, 09:53 AM
  #11  
Registered User
iTrader: (8)
 
NorCalSubie07's Avatar
 
Join Date: Jun 2008
Location: NW-Sacramento
Posts: 638
Car Info: 07 STi Limited #359 UGM
i cant wait to upgrade mine to a vf43. is it hard to find a jdm sti top mount intercooler?
NorCalSubie07 is offline  
Old 02-22-2009, 09:55 PM
  #12  
Registered User
iTrader: (19)
 
apexwagon's Avatar
 
Join Date: Apr 2006
Location: Bay Area
Posts: 1,112
Car Info: Sti hatch
probably just expensive, ive seen them quite a bit on nasioc, only twice on iclub
apexwagon is offline  
Old 02-28-2009, 04:11 PM
  #13  
Registered User
iTrader: (1)
 
NIAD 07 WRX's Avatar
 
Join Date: Jan 2009
Location: Alameda, CA
Posts: 20
Car Info: WRX 2007 TR
Did you do it yet?

I've got an 07 WRX TR with a downpipe, Borla Hush, MBC & a tune.

I'm having a VF39, STI TMIC, Walbro fuel pump, transmission/motor mounts and a tune installed next week.

Let me know how your VF43 worked out.
NIAD 07 WRX is offline  
Old 02-28-2009, 05:46 PM
  #14  
Registered User
Thread Starter
iTrader: (9)
 
415er's Avatar
 
Join Date: Jun 2007
Location: SF
Posts: 373
Car Info: 2013 WR Blue Pearl WRX Limited
oh, im just finding out for future reference so if i see parts i need for sale i can hop on those. let me know how your swap works out. especially that transmission.
415er is offline  
Old 03-02-2009, 01:59 PM
  #15  
Registered User
iTrader: (1)
 
Retro707's Avatar
 
Join Date: Feb 2009
Location: Napa/Fairfield Ca
Posts: 344
Car Info: 2007 Impreza WRX
i just got a VF39, Sti tmic, titek downpipe and all i need is a new fuel pump.
i also drive a 07 wrx. iam pretty excited, hopefully i do feel a lot of gains

and YES tuning it same day as installation. possibly at eq in fairfield.
Retro707 is offline  


Quick Reply: Upgrading 07 wrx to sti turbo



All times are GMT -7. The time now is 09:45 PM.