IHI VF Turbos Info - Page 4 - Subaru WRX Forum
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#46 Old 04-14-2008, 02:56 AM
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thanks

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#47 Old 04-23-2008, 12:13 PM
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you can go with a bigger injector as well, you can have your injectors sent out to PDX Tuning and they will make them 850cc for $175 bucks then they wont have to work as hard and if you ever want a bigger turbo you can stay with your same injectors
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#48 Old 04-23-2008, 11:30 PM
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I was torn between a Vf39 and VF34 for a bit. With a lot of research I have decided to go with either a TD05H EVO III 16G 7CM^2 or a TD05H 18G 7CM^2. These turbos will spin up quick and are rebuildabe if the need arises. speedelement.com sells the 18G for $750 Shipped. 600 CFM and able to support up to 400WHP with little lag.
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#49 Old 04-25-2008, 12:39 PM
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Realistically, 18g will only yield 290-300whp on a 2.0L. You can get up to 360whp on race gas with a really good setup and a good tune.

Personally, I run the 18g. It's perfect amount of power, but it's pretty much unusable in the town I live in since it's mostly 25mph everywhere.

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#50 Old 04-25-2008, 02:17 PM
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Yeah, an 18G will not spool up super quick on a 2.0. I have a STi short block going in the car right now. I should get it back monday. The extra displacement should spool the 18g fairly fast. The turbo set up for me will be in 6-8 months so I will probably "decide" on thirty other turbos between now and then. I will be surpised, however, if it is not either an Evo III 16G or an 18G.
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#51 Old 04-25-2008, 02:21 PM
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any 16G's a little small for a 2.5L engine...

04 STi 16G powered lagless fun
04 WRX: SOLD
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#52 Old 04-26-2008, 02:46 PM
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So you wouldnt want to go anything smaller than the 18g on the 2.5??

Last edited by VD5505; 04-27-2008 at 10:45 AM.
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#53 Old 04-27-2008, 10:12 AM
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Doesnt that really depend on what the driver wants out of the car though? Maybe a 16G would be enough for some that have the 2.5.

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#54 Old 04-27-2008, 10:57 AM
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of course,a 16 g dies out fast in the top end of a 2.5, but would spool up hella fast. so a autox'er might might what to use it.

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#55 Old 04-27-2008, 06:21 PM
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The main reason I am looking for a faster spooling(smaller) turbo is a previous car I had. First generation eclipse with forged internals running a 20G. The power was great but the lag was annoying to say the least. Two-three seconds before it really started moving. I am hoping to auto cross my car in the Atlanta Region and I don't want to have to wait for power. I'm sure, with the 2.5 and the higher CR coupled with a responsive turbo, I will be happy with the setup. Just have to hope the tranny lasts.
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#56 Old 04-28-2008, 10:35 AM
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Thanks for the backup Nagy. Thats exactly what I was thinking.

Joshua
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#57 Old 06-01-2008, 06:54 PM
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Quote:
Originally Posted by DUBXTCY View Post
The 06 fuel injectors are top feed and flow at 560 (LARGER THAN THE STI!)

The STI (04-05) are side feed and have been measured flowing at 480-490.
Gotta correct you on a couple things.
06 WRX injectors = 585cc

The STi injectors you're referring to are USDM, the JDM Pink injectors flow at 565cc


Anyone have any info on the VF43? Some of they guys from STLSubaru have been putting those in recently and suggested that to me. I ended up getting the VF34 instead, just a personal preference for the ball bearing, water cooled, JDM goodness.

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#58 Old 06-01-2008, 07:42 PM
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The VF43 is the same as a VF39 just with a redesigned wastegate.It is the turbo that comes on the 07 STi.Then the 08 STi uses a new VF48.

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#59 Old 06-01-2008, 08:06 PM
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So running the VF34 would be a better choice over the VF43 if I'm looking for better midrange and top end power?

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#60 Old 06-01-2008, 09:04 PM
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VF34 is a tad bit bigger but didn't come on any USDM subarus so finding a used one is much harder and thus it costs quite a bit more.

04 STi 16G powered lagless fun
04 WRX: SOLD
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