Long term reliability of VF34/39 upgrade - Subaru WRX Forum
 
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post #1 of 9 Old 05-06-2008, 09:15 PM Thread Starter
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Long term reliability of VF34/39 upgrade

Anybody out there that has upgraded their car to a VF 34 or 39 and had it on a while? Any issues with reliability? plan on doing the upgrade very soon and just looking for some background before making the decision. Thanks!
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post #2 of 9 Old 05-06-2008, 09:39 PM
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Its been very reliable for my friends that have done it. I noticed that you have an 06 though. You might want to look for something a little bigger.IMO Don't know how much power your going for though might help to know. Even for your car though either will be reliable.
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post #3 of 9 Old 05-07-2008, 02:14 AM
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+1 on figuring/deciding on your power goal for the car. Once that is decided then you can choose a turbo to meet you goal.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
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post #4 of 9 Old 05-07-2008, 09:43 AM
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Quote:
Originally Posted by exmotoman View Post
Anybody out there that has upgraded their car to a VF 34 or 39 and had it on a while? Any issues with reliability? plan on doing the upgrade very soon and just looking for some background before making the decision. Thanks!
I have personally met with people that had 50k+ on their vf turbochargers on a 2.0 engine excluding the miles collected previously with a td04. Your 2.5 ltr won't have to work nearly as hard to spin the turbo comparing to 2.0, so you're in a better postion already. Main "mod" has to be a good safe, concervative (18-19 psi) tune and the motor together with the turbo will last for a very long, long time.

drive = freedom
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post #5 of 9 Old 05-07-2008, 08:49 PM Thread Starter
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thank you for the info, was looking to get around 350 to 400 ideally at the crank. Was looking at super 16G which is the same turbo used on the Evo. No tune from Cobb on this turbo though. Probably stick with the VF34 or 39 and call it a day.
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post #6 of 9 Old 05-08-2008, 04:16 AM
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You would still want to get a tune after installing that turbo to maximize its potential. Cobbs maps are known to run rich. There can be more power to be had over the OTS map.

Joshua
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Stage 2 2005 WRX
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post #7 of 9 Old 05-08-2008, 10:30 AM
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I have a 39 and car runs great. Great power over stock. However if I had it to do all over again I would go with an 18g . My buddy has one and it seems like they are just as reliable with the potential of a couple extra ponies and a broader power curve. I plan on going to a 20g in the future. Folks out there will tell you to go bigger right away, but the way I see it, it may be safer to go in stages. Get used to more power gradually, then go bigger. Not cost efficient, but maybe safer. Plus even with a 39 we start maxing out injectors, so it is a quick and cheep power mod vs. going bigger right away (injectors, fmic, etc).

Don`t forget a fuel pump with that 39!

BJJ for the win!
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post #8 of 9 Old 05-27-2008, 01:26 PM
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06 and 07, you won't need injectors or a fuel pump for a vf series turbo. Yes, they start to max out and yes, it won't hurt to get them. but IMO it seems like money poorly spent.

Dub-R-X
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post #9 of 9 Old 05-27-2008, 07:13 PM
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Money poorly spent for better perfomance, reliability and a piece of mind? There is a member on here that just gt his 07 tuned with a vf 39 (its kind of aggresive it sounds) but his injector duty cycle he said was at 97% with stock injectors, sounds kind of close to me.

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