The history of turbo upgrades for your Subaru

[LaszloT]

So you want to upgrade your turbo, do you?

I like this history of turbo upgrades for your Subaru article:

World One Performance Blog
http://www.worldoneperformance.com/blog/tag/vf48/

"So there you have it: the history of turbo upgrades for your Subaru. So which of these is going to work best for you? The most important thing to keep in mind is that generally speaking, the bigger you go, the slower the turbo will spool, but the more top end power you’ll have. It’s also important to remember that the same boost level for one turbo is going to put out a different amount of power than another turbo. By this, I mean that 18 psi on an STI’s stock VF39 is going to produce less power than 18 psi on a FP Green on the same vehicle. Remember, boost is all about the amount of air going into your motor, so with a bigger turbo, you thus are forcing in more air, and if you have more air at the same amount of boost, the pressure is much stronger, which of course leads to more power. To sum it all up, here’s a general listing of some of the turbos I’ve discussed here and their potential power levels (given the proper supporting mods and fuel):

For 2.0L WRX

Mitsubishi TD04-16G: 210-230 whp
IHI VF29 and VF39: 250-270 whp
IHI VF30 and VF34: 260-280 whp
TD05-18G and Forced Performance HTA 68: 280-320 whp
TD05-20G: 290-330 whp
Forced Performance Green and Element Tuning GT49: 300-350 whp
Forced Performance Red, Forced Performance HTA Green, Element Tuning GT52, and Garrett GT30R (rotated and bolt-on): 350-400 whp

For 2.5L WRX, STI, LGT, and FXT

IHI VF39: 280-300 whp
TD05-18G: 300-340 whp
TD06-20G: 330-370 whp
Forced Performance Green and Element Tuning GT49: 350-470 whp
Forced Performance Red, Forced Performance HTA Green, Element Tuning GT52, and Garrett GT30R (rotated and bolt-on): 375-500 whp
Garrett GT35R (rotated and bolt-on), and Element Tuning GT65: 400-530 whp
Forced Performance HTA GT35R: 550-700 whp
Garrett GT40 and GT42R: 700+ whp"