Legacy BP GT turbo and Power question

[killervq30de]

Was wondering how much you could up the boost without changing anything else.. then found that the VF38 turbos don't like to be pushed.

Which lead me to find this out.. not sure how much is right as its cobbled together from random info, which all seems to go back to one sticky post about different turbo types.

The pre-2006 JDM facelift Legacy GT are meant to have a VF38 turbo for Autos and a TD04 for manuals. Auto making 195kw and the manual 205Kw. The TD04 is meant to flow better than the VF38 hence the higher power. I read the TD04 was to help avoid boost drops between gear shifts

2006-7+ are meant to have VF45 turbos which are ball bearing compared with thrust bearing on the VF38 (which are apparently prone to dying?). both auto and manuals now hace the vf45 and it flows nearly as well as the td04

So I'm wondering if the auto now makes similar power (excluding % of loss from torque converter)? So maybe 200kw?

Has anyone with a facelift/2007+ BP seen what turbo you have? Not sure if the GTB's got it for example and the GT stuck with the VF38?

[Subirex Automotive]

my 03 bp is running 19 psi boost on a ej207 stroker motor. currently running a vf45 turbo. hasnt given me any problems yet.

[Andy_Mac]

If you haven't had it tuned yet start there, well worth the effort. Auto subaru's tend to be detuned for auto's regardless of whether the turbo's are smaller or not.

Never heard talk of the td04's being better than the vf45's,

Also be wary when people talk about the td04's as the stocks ones are a 19t but there is an almost identical 20t drop in turbo which is getting more popular to give slightly more power.

Is yours a spec b or gt?

Real easy to get the model off the turbo with these. Looking straight down on the compressor side it should be on the side of there, really small mirror helped reading mine.

[Andy_Mac]

@subirex

Oohh, haven't heard about your one before. What kind of power are you making with that?

Edited February 13, 2015 by Andy_Mac

[GorGasmSpecB]

Option 1: Tune it and replace turbo IF it fails.

Option 2: Upgrade turbo and tune it.

Option 3: Do nothing.

Option 4: All of the mods(Money)!@#

[killervq30de]

Mines a GTB. Cool ill try and have a look, I assumed it was covered by heat shield. Saw a video online from a forester and he removed the intercooler then best shield before it was visible

[neodowd]

Are the vf45 single or twin scroll ? I have a facelift gtb spec manual 2006 and was under the impression it was single scroll but other info I have read

tells me it is twin scroll . cheers

[Subirex Automotive]

 neodowd said:

Are the vf45 single or twin scroll ? I have a facelift gtb spec manual 2006 and was under the impression it was single scroll but other info I have read

tells me it is twin scroll . cheers

twin scroll

[Andy_Mac]

Neodowd is yours a jap import firstly? Not sure if nz spec went facelift 06 or 07

Na checking it is a piece of cake. Just had another look now, just have to remove the engine cover then its on the compressor on the passenger side

Comp housing

Thats the hole you wanna poke your head into

And there's the sucker hidden down there, pretty vertical to where you look hence needing the mirror. Or just chuck the phone down there and take a few snaps and hope one comes out clearly.

Edited February 13, 2015 by Andy_Mac

[neodowd]

Andy_mac yes it is a jap import, looks like it's a twin scroll cheers

[killervq30de]

 Andy_Mac said:

Neodowd is yours a jap import firstly? Not sure if nz spec went facelift 06 or 07

Na checking it is a piece of cake. Just had another look now, just have to remove the engine cover then its on the compressor on the passenger side

Comp housing

And there's the sucker hidden down there, pretty vertical to where you look hence needing the mirror. Or just chuck the phone down there and take a few snaps and hope one comes out clearly.

Thanks for doing that I had though it was under the big metal lump/heat shield

What turbo do you have?

Edited February 13, 2015 by killervq30de

[Andy_Mac]

Vf45 in mine. Is yours the same?

[killervq30de]

I'm going to assume vf45 too, which is reassuring over the vf38. Won't have time unfortunately for a while to dig around in there.

[Andy_Mac]

Honestly man it seriously only takes 2mins or so.

Would be interesting to know if the auto's are in fact vf45 aswell.

[KiwiJoe]

I have an automatic 2007 JDM facelift 2.0 GT, and decided to take a look, expecting either a VF38 or a VF45. Nope. It's a VF44. Here's a picture I took (which was an absolute bastard to get, even with a DSLR and a tripod):

[killervq30de]

Mines auto gt spec b 2007, according to Carjam.co.nz was first registered in Japan June 07. Vf44 allegedly is my06, and the vf45 is my07.

Kiwi Joe and Andy Mac, I'll give it a go tonight

[KiwiJoe]

My B was registered in Japan in Feb 07, so a MY06.

[killervq30de]

 KiwiJoe said:

My B was registered in Japan in Feb 07, so a MY06.

Mine has the VF44 too .. so don't know who got what. Unless auto's are vf44 and the manuals are vf45. Thing I said about MY06 and the vf44 was just off some post on US forum and they are unlikely to know that much about the JDM variants anyway

Double checked and mine is a genuine GT spec B (rather than someone just adding wheels and bumper), it has the BP5E5CV model plate by passenger door. http://www.japanvehicles.com/newcars/subaru/LegacyBP/LegacyTWBP_E.htm

Edited February 19, 2015 by killervq30de

[KiwiJoe]

I found a post from a JDM 5MT owner with a VF44, so it looks like both the VF44 and VF45 were used in autos and manuals.

[sobanoodle]

Went to check what my one was.... .... and found no turbo at all, must be a VF00 then

[Andy_Mac]

 KiwiJoe said:

My B was registered in Japan in Feb 07, so a MY06.

Interesting. Mines a December 06 registration, so possibly MY07 then, my understanding of car year logic was that the MY always ran from late in the previous calendar year rather than after it had started.

Suppose leftover stock will in fact sit there until sold so anythings possible.

There's mine anyway

The real question here is what the heck are the specs on the vf44. It's hard enough finding anything usefull even for the vf45.

Though chances are it's the same turbo with some very minor tweaks that were enough to justify a model change.

Edited February 20, 2015 by Andy_Mac