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2001 Legacy B4 - what turbos? URGENT!!


FaceAche

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I got told by my mechanic that my secondary turbo was starting to fail. Figured i'd replace both to be on the safe side, so i've just ordered VF32 and VF33 turbos. But now i'm thinking that i should have got VF31 and VF32 ones, as my B4 seems to be a Revision C (BE5C48T). I'm quite confused, and need to know whether i've ordered the wrong ones so i can cancel them before they're shipped.

 

So should i have gone with the VF31/VF32 combo, or will the VF32/VF33 combo be okay? If i do need the VF31/VF32 combo, which is the primary (passenger side of the engine), and which is the secondary (drivers side).

 

I love my B4, but i'm not mechanically minded - just trying to save some coin here, but it will be a false economy if i've got it wrong!

 

Would really appreciate some help/advice.

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Thanks.

 

So the primary is definitely a VF31 - i can see it stamped on it after digging in the engine bay a bit. Unfortunately without some serious pulling-apart of stuff (which i don't have the tools for), i can't tell what the secondary is.

 

Strong for Subaru have said i need a VF31, and either a VF25/26/27, which they're sending me. They say that VF32 won't work (so i have cancelled the VF32 that i have got coming from SubTech, which is a shame, as it apparently was coming out of a car that had done around 30,000k's).


I know for sure that the primary is VF31, so that's something. Now if i go with what Strongs say, will the VF25/26/27 that they send me be comparable to the VF32 in terms of performance?

 

So much conflicting information out there!

Edited by FaceAche
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They didn't actually say why, just said a 32 wouldn't work, that i needed a 25/26/27. No issues with the car, just a noisy/leaking secondary turbo. Figured i'd get both of them done since the intercooler etc would already be out.

 

I am happy to go with whatever works, i just don't want reduced performance, especially if the ECU thinks that there is a bigger turbo in the car than their actually is - sounds like a slippery slope to more issues and more $$$'s.

Edited by FaceAche
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Far out - do any supposed professionals have any idea what they're talking about?

 

I've had two Winger Subaru's tell me the primary turbo is on the drivers side, another Winger actually get it right along with my normal mechanic, and a second opinion from Collins Automotive.

 

Now i've got Strongs telling me that VF25/26/27 will be suitable as a secondary!  Got to admit, this whole exercise has been stressful and frustrating, and for the amount of time i've spent researching it, i might as well have just handed it over to my normal guy and said "Fix it!".

 

VF22 single-turbo conversion is looking more and more appealing - who would be the best people to do it?  Anyone in Hamilton?  Or would Torque Performance or SubTech be the best?  Any other Auckland/Waikato suggestions.

 

Oh, and thanks for the help here guys, really do appreciate it!

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It's more a mod you do yourself if you have the time and some mechanical knowledge.

 

If you want it done at a realistic rate and correctly hit up Matt at Mattchanics in Auck. Could try @PBMS as well but Id guess they would prefer to do it properly with a link etc.

 

Don't limit yourself to a VF22 you are probably better off getting a VF 23, 24, 28, 29, 30 or 34 if its going to run on a stock ecu unturned.

 

You will need a wrx ecu A7 or A8 too the STI J2 doesnt work as it causes heavy detonation.

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No mechanical knowledge, tools, or time unfortunately - i'd really just want to drop it off somewhere, pick it up and few days later, and pay whatever i owed. Have messaged Mattchanics and asked for a quote. Will take it from there.

 

Not sure what you mean by @PBMS wanting a link :)

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8 minutes ago, FaceAche said:

No mechanical knowledge, tools, or time unfortunately - i'd really just want to drop it off somewhere, pick it up and few days later, and pay whatever i owed. Have messaged Mattchanics and asked for a quote. Will take it from there.

 

Not sure what you mean by @PBMS wanting a link :)

 

Other guy to try is @Subirex Automotive top guy and looks after club members. Also in Auck.

 

They would probably want to fit a tuneable Link ecu - means you would drop another 3k on an ecu and tune along with everything else you need.

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^ Right, okay. Going to be a bit too rich for me i think - sounds like a $6K+ kind of job, which is probably more than the car is actually worth.

Damn, maybe just keeping it as-is is the best option. Just get a VF31 as the primary, a VF32 as the secondary, and be done with it.

I'm torn!

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7 minutes ago, FaceAche said:

^ Right, okay. Going to be a bit too rich for me i think - sounds like a $6K+ kind of job, which is probably more than the car is actually worth.

Damn, maybe just keeping it as-is is the best option. Just get a VF31 as the primary, a VF32 as the secondary, and be done with it.

I'm torn!

 

Wont cost that much with using stock stuff.

 

Turbo $300

Header $100

Downpipe $150

Intake $150

Wrx ecu $100

Tmic $100

Map/boost sensor $50

Gaskets and bits and pieces $300

Labour is the unknown

 

But that's most of it covered.

 

 

 

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5 minutes ago, FaceAche said:

^ So that's for a single-turbo conversion?   New VF22 by itself seems to be $2000 to $2500 - where would i get one for $300?

 

The VF turbos sell for $2-400 secondhand. It's madness to buy new. Far better options if youre spending that sort of money.

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^ Excellent - thanks.

 

Have asked for single-turbo conversion quotes from Mattchanics, Subirex and what i suspect will be the joke option due to cost, Torque Performance.

 

If i do stay with the current twin setup, i'll get the secondary replaced, as it's the one that's faulty. Would you suggest getting the primary done as well, even though there's nothing wrong with it?  My mechanic has quoted $600 labour for replacing the secondary, and because the intercooler etc is already out, $900 for doing both. So my thinking is that if the primary does the bulk of the heavy-lifting, but it's the secondary that's gone, the primary won't be far behind, so best to get them both done - thoughts?

Edited by FaceAche
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Turbo starting to fail? I'd be clarifying exactly what that meant before throwing a pair of turbos at it. Turbos are often the last thing to fail in a twin turbo system. It's everything else around them that fails first! 

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Ok no time to read all that ^ Sorry for the late reply and if i end up saying something someone has already stated.

 

Firstly, if you cant do the single conversion yourself Id suggest forgetting it. There is to much to iron out once its done which you can only really do over time imo.

 

Re- Turbos. Just replace the Primary with the VF33. Don't worry about the secondary unless it has been diagnosed as bad. A secondary rarely die in these, I have a VF32 sitting on my bench that has 175,000 and its as new in regards to shaft play and throw.

 

 

To my knowledge the only major difference between the VF32 secondary and 31 Primary Turbo is the exhaust housing the V32 has a slightly larger  P18  and VF31 smaller P16. These housings are totally different, not only in size but also flange bolt pattern naturally because one is a primary one is a secondary so they are NOT swappable. But the CHRA is the same to my knowledge so you can make a frankenstein secondary with a 31 and an old 32. That being said, now that I have read what your needing that's all mostly useless information.

 

Pretty positive you will have VF31 Primary “As you have already identified” And a VF27 secondary.

 

I read somewhere that the vf27 is actually a better option for high power setups on the twins but as we are all well aware there is alot of conflicting information out there on the twins. Regardless the performance difference between the 32 and 27 are negligible so don't loose any sleep over it.

 

I’d stick with the vf31/vf27 combo and work towards being single turbo in the future as you have said.

 

 

To Summarize: Replace the Primary and keep driving. 

Edited by A_J_T
made no sense, reworded to prevent adding to the abundance of conflicting information on the internets
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Thanks for the response. Secondary has been diagnosed as bad by two different independent mechanics (one a Subaru specialist).

Was having trouble figuring out exactly what turbo's are installed. Initially thought it was 32/33 but it's Rev C, so 31 as primary and something else. Can see VF31 stamped on the primary, but can't tell what the secondary is.

 

I understand that with secondary turbo's pretty much any of them will bolt on except for a 14. Initially organised a 31 primary and 32 secondary from SubTech, but they weren't happy with the 32 so didn't want to supply it - have swapped it out for a 27.

 

Going to get both of them done, and keep the 31 that's currently on the vehicle as a spare, just in case. Putting aside the single-turbo conversion for the time-being; probably going to be too expensive and time-consuming for me.

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