Advice on turbo upgrade - Subaru WRX Forum
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#1 Old 06-19-2012, 09:15 PM
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Advice on turbo upgrade

I've researched this a bit and come to the conclusion that I would rather stick with an IHI VF series turbo since after installation, I want to flash it using a standard Cobb OTS map and then get a protune at a later date. I was set on a VF34 but they seem impossible to find (in great shape anyway) so I have kind of narrowed it down to a VF30 or VF39. I was wondering what you guys would recommend of the two? The problem is that only the VF39 seems to be readily available. Does anyone know where I could possibly source a new VF34? I am currently at stage 1 (it's an 05 Saabaru) and have already sourced a Prodrive axle back, STI TMIC, Cobb catted dp. So now all I need is a turbo, pinks, and a Walbro. My goal is for a reliable daily driver with around 275-285 whp/tq with good midrange punch. Car has 42,000 miles, with about 4000 miles on stage 1.
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#2 Old 06-19-2012, 10:45 PM
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Are those all of the mods you have the car?
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#3 Old 06-20-2012, 04:51 AM
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Quote:
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Are those all of the mods you have the car?
The only modification currently on the car is a flash to stage one. Those are all of the parts I have so far. I was contemplating just going to stage two but after driving a couple of stage 2 cars, I thought I would want a little more so tuner suggested doing it all at once.
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#4 Old 06-20-2012, 05:42 AM
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What about a VF22?

Paul
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#5 Old 06-20-2012, 08:04 AM
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"stick" with an IHI turbo? Your stock turbo is a Mitsubishi turbo. Cobb has maps for several turbos made by Mitsubishi.

VF34 is overpriced. It's not that different than a much more common big 16G which generally costs way less

VF22 is old tech. Slow and doesn't have much top end.

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#6 Old 06-20-2012, 09:01 AM
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VF22 has the most top end of any of the IHI VF line. However, if the only reason you're wanting to go with a VF is because Cobb has OTS maps for them, I would say you are wasting time and money.

OP, you need to upgrade your suspension and brakes before you get a larger turbo.
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#7 Old 06-20-2012, 11:17 AM
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I should have mentioned that the suspension was done. I was focusing more on the power upgrades. I've got a matched Whiteline sway bar setup with Kartboy end links, Epic springs, with stop tech brakes.

My problem is more sourcing the IHI VF series turbos. Very few places seem to have them in stock and the majority of them I am finding are the VF39s. As I said, I would be very happy with about 275whp on a Mustang dyno. I know the Dynojets read a bit higher. My budget for the turbo and install is around $1500-2000

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VF22 has the most top end of any of the IHI VF line. However, if the only reason you're wanting to go with a VF is because Cobb has OTS maps for them, I would say you are wasting time and money.

OP, you need to upgrade your suspension and brakes before you get a larger turbo.
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#8 Old 06-20-2012, 12:03 PM
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A new VF30/34/etc turbo will run ~$1,200 on its own. A used VF39 will run you $300 and offer within 5 whp what the others will.
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#9 Old 06-20-2012, 12:34 PM
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Pick up a used VF. I know it's a crapshoot but that's what PayPal protection is for.

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#10 Old 06-20-2012, 04:16 PM
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Get a 39, they are a dime a dozen and with putting you within a few pony's of the others.. I would say its worth it. I have a VF30 and love it. If I had to hunt for a replacement. I would probably get a 39. Just sayin'

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#11 Old 06-20-2012, 07:31 PM
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Or my favorite, an evo3 16g

One of the best streetable chargers out there for a 2.0

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#12 Old 06-20-2012, 10:19 PM
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I was under the impression the VF48 had the best top end for the layout that we're talking about. I can't remember too many VF22 projects anymore.

Kirt
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"When in doubt...flat out" - Colin McRae
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#13 Old 06-20-2012, 11:40 PM
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VF22 is the largest, but not by much.
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#14 Old 07-12-2012, 06:26 PM
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So I was able to source a low mileage (18000 mi) VF34 but now I am debating whether or not I should go to Stage 2 first and see how that goes before doing the VF34. As I am reading more and more about these two stages, the two things that give me pause are the strength of the tranny and the other, to a lesser extent, the spool characteristics of the VF34. I seem to read as many threads saying that the VF34 seems to be much more laggy than the td04. While there are others that say it's only minutely more laggy. At this point, the tranny is the thing that's worrying me the most, though I don't track the car, I also don't want to have to go into a 5k transmission upgrade just for a daily driver. For anyone who has the VF34 setup, what are your thoughts on the driveability in comparison to the stock? As I said, if I can get 250whp/tq with a wide, flat powerband from around 3300 to 6000, I would be more than happy with that. I realize I will have to get a protune after installtion so hopefully the tuner can sort out those things.
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#15 Old 07-13-2012, 05:42 AM
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Nothing will spool like a td04 out the box. The VF34/39 are not THAT far off, maybe 300-400 RPM.

You can can reach your goals on that turbo.

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