vf 34 or 39 - Subaru WRX Forum
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#1 Old 07-11-2008, 01:35 AM
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vf 34 or 39

i dunno which one to get. have 2005 wrx and my turbo is goin bad and need a new one. car has 76,000 miles. i dont know which one to get. want more power but not to much where its gunna be lessening the life of my motor. help!!!! found a kit with the 34 with injectors and fuel pump for $1,400. HELPPPP!!!!!!!!!!!!!!!
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#2 Old 07-11-2008, 04:36 AM
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Either one is a suitable turbo. If you just want a little more top end and torque with little to no lag. Look into used ones with low miles if you want to save some cash.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
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#3 Old 07-11-2008, 06:36 AM
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I was also looking to upgrade to a 34 or 39. I think i will go with the 34 just because some people have said they seem to like it alittle better. By the way where did you find that kit at ?
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#4 Old 07-11-2008, 09:20 AM
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there is a kit for the 34 is at www.speedelement.com - Home
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#5 Old 07-11-2008, 03:12 PM
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the VF39 is fairly small turbo with a limited wastegate. The VF34 is a bigger turbo (though, hardly large) and it is a more advanced design with helps keep spool from getting much slower than the VF39.

VF39s are easy to find used because they came stock on 04-07 STis. VF34's are mostly bought new which costs a whole lot more.

That said, I prefer TD05 based Mitsu turbos for the EJ20 WRX's. They spool fast and can make great numbers.

EDIT: Oh, and in addition to the turbo, fuel pump, and injectors (assuming it's already stage 2), you'll also want a larger intercooler.

04 STi 16G powered lagless fun
04 WRX: SOLD
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#6 Old 07-11-2008, 04:33 PM
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+1 Dont waste your money on a vf series turbo. 16g's can make comparable numbers and are rebuildable.
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#7 Old 08-13-2008, 09:41 AM
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Quote:
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the VF39 is fairly small turbo with a limited wastegate. The VF34 is a bigger turbo (though, hardly large) and it is a more advanced design with helps keep spool from getting much slower than the VF39.

VF39s are easy to find used because they came stock on 04-07 STis. VF34's are mostly bought new which costs a whole lot more.

That said, I prefer TD05 based Mitsu turbos for the EJ20 WRX's. They spool fast and can make great numbers.EDIT: Oh, and in addition to the turbo, fuel pump, and injectors (assuming it's already stage 2), you'll also want a larger intercooler.
MOSC,

Would that be a good choice, if you just wanted a little more kick out of the car. But without making any huge amounts of Tq (wrx gears:eek

_Ryan_
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#8 Old 08-13-2008, 10:05 AM
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sure?

04 STi 16G powered lagless fun
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#9 Old 08-13-2008, 12:21 PM
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sure?
I dont feel confidence in your answer

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#10 Old 08-13-2008, 01:32 PM
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You can brake the tranny at stock levels, you can have the tranny last fine for 50k miles at 350whp. It's all in how you drive it. There is no specific whp under which you can beat the hell out of it and 1whp above, it'll break on the first shift, sorry.

I think the TD05-16G is the perfect turbo for the EJ20 but that's just my personal tastes. I like a quick spool and a fat torque curve for spirited driving around town. As Stacy used to say, it's the turbo Subaru should have put on there from the factory in the first place.

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#11 Old 08-15-2008, 07:15 AM
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You can brake the tranny at stock levels, you can have the tranny last fine for 50k miles at 350whp. It's all in how you drive it. There is no specific whp under which you can beat the hell out of it and 1whp above, it'll break on the first shift, sorry.

I think the TD05-16G is the perfect turbo for the EJ20 but that's just my personal tastes. I like a quick spool and a fat torque curve for spirited driving around town. As Stacy used to say, it's the turbo Subaru should have put on there from the factory in the first place.

I didnt know that was the 16G. Now is that the "big" 16G, or just the reg 16G? Because I have heard people mention "big 16G and "16G".

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#12 Old 08-15-2008, 08:57 AM
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I think he means the regular 16g... If im not mistaken, there are 3 16g's. The 16g, Big 16g, and EVO III 16g, they are bigger respectively. If your just looking for a little more umph, go with the regular 16g.
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#13 Old 08-15-2008, 10:54 AM
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there are probably 10 different combination of TD05-16Gs out there for the WRX. All of em are good. Some just breathe more on the top end then the others.

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#14 Old 08-15-2008, 05:58 PM
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I just upgraded my 06 to the vf39 turbo. I got it protuned, it throws down 290whp, and 296wtq. The increase was great and im happy with it and i ended up spending a total of 700 bucks and then the tune. Hopefully the tranny will last more than 50k miles while at 350hp like mosc was saying. Tuner was telling me the wrx tranny can be tuned up to 330awtq before he considers it the "redzone" from about 300-330 he considers it a yellow zone, and below that it should be reliable. People come in to the tuning shop telling him to push 20psi and that they are not worried about the tranny, so the last guy was hitting 370awtq before gears started flying everywhere.
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#15 Old 08-15-2008, 08:38 PM
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yes but as mosc was saying it all depends on how many miles are on the tranny and how hard it is pushed. so if somone shifts vary smoothly and dosn't ram on the gas all the time the tranny could last a vary long time but if it's a track car then it could go fast.

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