What is the easiest least expensive turbo swap?
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This is a discussion on What is the easiest least expensive turbo swap? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I have an 06 wrx tr and i wanna upgrade the turbo but i dont wanna go nuts its a ...

  1. #1
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    Question What is the easiest least expensive turbo swap?

    I have an 06 wrx tr and i wanna upgrade the turbo but i dont wanna go nuts its a daily driver i was wondering what would be the most reliable least expensive swap thanks

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    Registered User wrx wagone's Avatar
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    Probably a VF39 swap. You can find a used STi VF39 turbo for usually ~$400 and if you have a Cobb AP you can use an OTS map.
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    +1 on VF-39. It's a bolt on.

    All you really need is Cobb AP (or some other EM, Cobb has OTS maps for free tho), STi TMIC (get em used for around 200-300) w/ the splitter and bellows, and a nice low mileage VF-39.

    Your injectors are good and fuel pump won't need to be upgraded (but it wouldn't hurt).

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    Registered User wrx wagone's Avatar
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    I'm not sure I would bother with a VF39 on a 2.5L motor though, but anywho.
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    GraysonSubaru's Avatar
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    VF39 would be the least expensive, but i would just hold off until i could get an 18g..

    18g is the smallest i would bother with on the new 2.5L
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    Registered User LeeC's Avatar
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    Check out proven power bragging on nasioc, a few guys are making real nice numbers off of vf39's on their 2.5 wrx's.
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    vf39 is a peice of crap, you'd have to have ported due to spiking issues, why upgrade to a worked over peice of crap? but. . . yeah it may be the easiest due to fuel system and mail order tuning. maybe you can run a 16g on stock fueling with a custom tune, but thats just an idea. i'm no expert. i agree with the addage 18g or bigger on 2.5.

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    Resident meany-rator 06wrx4me's Avatar
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    Cobb has an OTS 18g map as well.
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    GraysonSubaru's Avatar
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    Quote Originally Posted by 06wrx4me View Post
    Cobb has an OTS 18g map as well.

    that i did not know. it is for the 2.0L??
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    Resident meany-rator 06wrx4me's Avatar
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    Quote Originally Posted by GraysonSubaru View Post
    that i did not know. it is for the 2.0L??
    Looks like its only for the 2.5l. The FP18g map came preloaded on the V2 AP with your 3 fuel choices. So if he has a 2006 the AP has an OTS FP 18g map.

    Just looked on Cobbs website for 2.0l looks like no dice, but they do have an FP16g map.
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  12. #11
    Registered User bcyb1029's Avatar
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    VF39 to small, 18g is the way to go.
    Tuned by Jorge at P&L, 240.83whp 239.60wtq at 14.8psi on 2.0L with stock td04 (But doesn't run)

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    lots of people don't seem to read too well.

    the easiest, least expensive is the vf39, no question, 100% without a doubt. there is no discussion. you can get a 39 for <200 bucks, and EASILY get into the 12s with decent driving.

    this is an sti list, but remember--you've got one less shift:

    http://forums.nasioc.com/forums/showthread.php?t=959316

  14. #13
    GraysonSubaru's Avatar
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    I can read...my original post:

    VF39 would be the least expensive, but i would just hold off until i could get an 18g..

    18g is the smallest i would bother with on the new 2.5L


    Added: the VF39 can create some problem due to spiking and cracking. Several people on the forum have done the VF39 upgrade and had problems. Of course there are others that have not had any problems. thing is there, if it cracks, you are out of luck and the $$ that it cost you.

    with the 2.5L, i would suggest the 18g, plus it has a warranty so if it does fail in their guidelines, they would replace it.
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    Quote Originally Posted by GraysonSubaru View Post
    thing is there, if it cracks, you are out of luck and the $$ that it cost you.
    how exactly does the crack affect performance?

    i personally know multiple people with cracked p17/p18 housings and it doesn't make an iota of difference in performance. the crack goes between wastegate port and the main turbine outlet, and is almost never more than a fracture (ie, no space between broken parts).

    on the other hand, the crack did make a difference in that it ended up saving them 100 bucks on the price of the turbo.

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    Quote Originally Posted by ride5000 View Post
    how exactly does the crack affect performance?

    i personally know multiple people with cracked p17/p18 housings and it doesn't make an iota of difference in performance. the crack goes between wastegate port and the main turbine outlet, and is almost never more than a fracture (ie, no space between broken parts).

    on the other hand, the crack did make a difference in that it ended up saving them 100 bucks on the price of the turbo.
    if you are going to have it port and polished, it does have an effect. plus the 39's are notorious for boost creep unless you go through the trouble of a bigger waste gate...which just adds to the cost of the turbo setup as a whole.
    Quote Originally Posted by RayfieldsWRX View Post
    Hey, being the forum car ADD guy is better than being the forum OG.
    Quote Originally Posted by Mikie13 View Post
    Well nobody cares what you think, Seth

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