turbo upgrade vf34, or 39
02-02-2005, 08:40 PM
#4
VIP Member
iTrader: (7)
Join Date: Jul 2003
Location: Hwy 39, CA
Posts: 1,639
Car Info: Stage 4+ Bugeye
Forced Performance Green, that from what I have heard is the best. Out of those 2 I would get a VF-34 and send it to deadbolt to have it ported and polished and ceramic coated. That is what I am doing. I will keep you posted.
Rush
Rush
02-02-2005, 10:09 PM
#6
VIP Member
iTrader: (7)
Join Date: Jul 2003
Location: Hwy 39, CA
Posts: 1,639
Car Info: Stage 4+ Bugeye
Porting and polishing gives the turbo better flow charachteristics, more power, less spool time. The VF-39 is a plug and play. STi injectors, upgraded fuel pump, and a turbo back exhaust.
Rush
Rush
02-02-2005, 11:02 PM
#7
Registered User
Join Date: Sep 2004
Location: Seattle
Posts: 10
Car Info: 03 Wagon
Originally Posted by 02BlackWRX
Neither of those would be the best 
The better of those 2 would be the VF 34 though, its slightly bigger.
The better of those 2 would be the VF 34 though, its slightly bigger.
wat is the best turbo upgrade for a 02 wrx? vf 34 or 39?
IHI Turbos
VF22
VF30
VF34
VF35
VF37 (twin scroll)
VF39 (USDM STi Turbo)
Mitsubishi Turbos
TD04-13T (Stock Turbo)
TD05-16g small wheel
TD05-16g Super Wheel
TD05-18g
TD05-20g
With any turbo upgrade you need some sort of Engine Managment as well as larger injectors and a fuel pump and a catless up-pipe. Thoes are the bare minimums you will need to keep from blowing up your engine.
There really is no "best" turbo. What you need to decide is what you want to do with your car. And then go from there to decide on what turbo you want. I'd recomend going to www.boostplanet.com and asking thenm a few questions.
02-03-2005, 03:53 PM
#8
Registered User
iTrader: (12)
Join Date: Nov 2002
Location: Reno, NV
Posts: 18,369
Car Info: 1993/2000/2001 GF4 mostly red
Originally Posted by NWWagon
Negative.. the vf34 and vf39 are the same compressor and turbine wheel. The diffrence is they have slightly diffrent housings on the hot side. The vf34 is a pe18 and the 39 is a pe20.
The VF34 is a P18 housing and the vf39 is either P17 (early 04 production) or P18 (later STi). P18 VF39s and VF34s are essentially identical in terms of power output and spool. You are correct in saying that any worthwhile turbo upgrade requires injectors, a fuel pump, and some form of engine management.As for the rest, you need to define "best" as you see it Jizzo. How important is spool versus peak horsepower? Will you be drag racing, autocrossing, track driving...? That will help us suggest a "best" turbo for you. So far everybody else is just telling you which ones are bigger.
02-03-2005, 09:23 PM
#9
Hmmm...you guys got me thinking too!!
I've been a fan of the WRX since Collin took his WRC championship and now, I've finally got one of my own!! I'm a totally rookie on the world of forced induction and a newer turbo choice will be likely for me in the near future. I'm a big time track and autocross enthusiasts so a Turbo with relatively low boost characteristics and strong mid-high end and little give down below would be best right? Basically, I want a Turbo that I comes alive around 2-2.5k rpms with the full treatment of bolt ons, port polishing and engine management. I was looking at the VF34...would this be a wise choice?
02-12-2005, 09:40 AM
#12
Registered User
Join Date: Feb 2005
Posts: 57
HP gain??
aye sup all ... ummm i had a vf34 installed with uppipe and downpipe and full turboback with no cats and new injuectors and fuel pump and had a very expensive reflash to make it all work to the top of their performance and i only gained 6-9 hp .... is it me or is that not right?? just wondering its a 05' wrx and was broken in already
02-12-2005, 03:24 PM
#14
Registered User
iTrader: (12)
Join Date: Nov 2002
Location: Reno, NV
Posts: 18,369
Car Info: 1993/2000/2001 GF4 mostly red
Originally Posted by ReZie
aye sup all ... ummm i had a vf34 installed with uppipe and downpipe and full turboback with no cats and new injuectors and fuel pump and had a very expensive reflash to make it all work to the top of their performance and i only gained 6-9 hp .... is it me or is that not right?? just wondering its a 05' wrx and was broken in already
Yeah, ummm... You should be gainig 60-80 horsepower at the wheels. Do you mean the reflash came last and that only gave you 6-9 hp over not having it?
02-12-2005, 03:47 PM
#15
Registered User
iTrader: (1)
Join Date: Dec 2002
Location: College Park, MD
Posts: 180
Car Info: 2002 Wrb WRX sedan
Originally Posted by ReZie
...and had a very expensive reflash to make it all work to the top of their performance and i only gained 6-9 hp...
So did you go from stock to a VF34, injectors, and fuel pump? What kind of steps did you take before that if any? Did you reflash it ever before?