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Old 03-01-2016, 09:52 PM   #1
DFL2.5RS
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Default VF series turbo identification and information

I recently spent some time searching nasioc and the internet in general for information on how to identify various VF series turbochargers (especially if the etching has been removed/polished off of the compressor cover). It was very challenging to find a single location with all of the information in an easily accessible format.

The purpose of this thread will be to compile at least some basic information on how to identify various turbochargers in the VF series that are common in subaru applications. IF you have additional information to add, please feel free to add it below and I'll try to update the initial posts to reflect it.

Some of the compressor inlet measurements are estimated based on reported similarities for turbochargers where I could not find a reliable source. The dimensions for the VF22, VF23, VF24, VF30, VF34 should be accurate within a fraction of a millimeter. I've measured a VF23/VF24, a VF39 and also a VF22 compressor inlet and all were very close to the listed values, though the VF22 compressor cover I have was slightly closer to 48mm in actual diameter.

turbine housing identification location:
Look for identification stamp inside the turbine housing inlet


Links:

http://www.scoobynet.com/general-tec...rbo-specs.html

http://www.scoobytuner.com/tuning/?tSfID1=4&tuningID=43

http://www.igotasti.com/vBforum/show...I-Series-Specs


VF22
compressor inlet diameter: 48.5mm
Compressor wheel blade count: 5 primary, 5 splitter
exhaust housing scroll:single
exhaust housing size/casting:P20 (large housing, should have "20" stamped inside of the exhaust turbine housing inlet)
exhaust wheel blade count: 11

VF23
compressor inlet diameter: 46.7mm
compressor wheel blade count 6 primary, 6 splitter
exhaust housing scroll: single
exhaust housing size/casting: p20
exhaust wheel blade count: 11

VF24
compressor inlet diameter: 46.7mm
compressor wheel blade count: 6 primary, 6 splitter
exhaust housing scroll: single
exhaust housing size/casting: p18
exhaust wheel blade count: 11

VF28
compressor inlet diameter: 46.7mm
compressor wheel blade count: 6 primary, 6 splitter
exhaust housing scroll: single
exhaust housing size/casting

VF29
compressor inlet diameter: 46.7mm (can anyone confirm this?)
compressor wheel blade count:6 primary, 6 splitter
exhaust housing scroll: single
exhaust housing size/casting: p18?
exhaust wheel blade count:11

VF30
compressor inlet diameter: 47.9mm
compressor wheel blade count: 6 primary, 6 splitter
exhaust housing scroll: single
exhaust housing size: p18
exhaust wheel blade count: 11

VF34
compressor inlet diameter: 47.9mm
compressor wheel blade count: 6 primary, 6 splitter
exhaust housing scroll: single
exhaust housing size: p18
exhaust wheel blade count: 11

VF35
compressor inlet diameter: ??47.9mm (reportedly similar to VF30)
compressor wheel blade count: 6primary, 6 splitter
exhaust housing scroll: single
exhaust housing size/casting: p15 (small, fast spool)
exhaust wheel blade count: 11

VF36/VF37 (36 is roller bearing, 37 is thrust/journal bearing)
compressor inlet diameter: ??47.9mm (reportedly same as VF30)
compressor wheel blade count:6 primary, 6 splitter
exhaust housing scroll: twin
exhaust housing size/casting: p25
exhaust wheel blade count: 11


VF38
compressor inlet diameter:
compressor wheel blade count:
exhaust housing scroll: twin
exhaust housing size/casting
exhaust wheel blade count:

VF39
compressor inlet diameter: 47.9mm
compressor wheel blade count: 6 primary, 6 splitter
exhaust housing scroll: single
exhaust housing size/casting: p18
exhaust wheel blade count:11

VF42
compressor inlet diameter: ??48.5mm -similar to VF22
compressor wheel blade count:6 primary, 6 splitter
exhaust housing scroll: twin
exhaust housing size/casting: p25
exhaust wheel blade count: 9


As noted above, please feel free to post, or PM me with any additions, or discrepancies.
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Last edited by DFL2.5RS; 03-02-2016 at 07:41 PM.
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Old 03-02-2016, 01:50 PM   #2
rob
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Excellent, thanks for sharing.

-Rob
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Old 03-09-2016, 06:50 PM   #3
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Great post, I've featured it on my blog. Let me know if you're not ok with that:
http://www.subiefiles.com/post/140766391764

I'm also making a spreadsheet now
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Old 03-17-2016, 03:51 PM   #4
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Quote:
Originally Posted by elislider View Post
Great post, I've featured it on my blog. Let me know if you're not ok with that:
No problem at all, I'm honored
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Old 03-17-2016, 05:05 PM   #5
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Old 03-18-2016, 07:18 PM   #6
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Quote:
Originally Posted by DFL2.5RS View Post
No problem at all, I'm honored
Any chance you can add the hypothesized CFM flow rate, RPM to spool, and rough WHP power range?

Also, VF36 had the unique titanium compressor wheel that is worthy of noting
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Old 03-22-2016, 12:59 AM   #7
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Quote:
Originally Posted by machineica View Post
ooOooOooOOoOOOOoOOoo

fancy

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Old 03-22-2016, 03:06 AM   #8
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Quote:
Originally Posted by machineica View Post
Nice find

Look what i made Spreadsheet ad or mod it up, but post back what you did so ever buddy can use it.

Last edited by zman519; 03-22-2016 at 03:17 AM. Reason: added DL file link
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Old 03-22-2016, 07:30 PM   #9
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HERE is the spreadsheet I made the other day. I just dumped that link contents into the second tab but haven't integrated it.
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Old 03-23-2016, 05:38 PM   #10
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The VF-36 does not have a titanium compressor wheel. It does however have a TiAl (Titanium Aluminide) turbine wheel and shaft.

Quote:
Originally Posted by dahoseman View Post
Any chance you can add the hypothesized CFM flow rate, RPM to spool, and rough WHP power range?

Also, VF36 had the unique titanium compressor wheel that is worthy of noting
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Old 07-11-2016, 06:39 PM   #11
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Thanks for this.
*Edit - On the ej257, vf22 spools faster and drops off sooner than vf39. Suspected smaller turbine a/r but this doesn't seem to be the case*

Also read that some early vf39 have a p17 but don't know what the difference is.

Wish IHI would make info available!

There is lots of info and pictures here http://subaruidiots.com/turbo-stiwrx...ger-breakdown/ but they claim the vf22 is the biggest all around. This contradicts Defiantspaz experience here http://www.iwsti.com/forums/2-5-lite...upgrade-2.html

Last edited by joek92; 07-13-2016 at 11:09 AM.
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Old 07-12-2016, 06:35 PM   #12
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All P18 housings are the same size. They can be interchanged with any of the VF series turbos as long as they are the same bearing type(ball bearing or journal bearing). For example you can swap the vf-39 p18 exhaust housing on a Vf-37 and vice versa. But it would not be swappable to a vf-36 (you could swap a vf22 p20 housing over to the vf-36 or a p18 off of a Vf-34). I have a P20'd VF-34 going on my version 8 EJ207. I'll post numbers once I get the car together and tuned.
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Old 07-13-2016, 11:05 AM   #13
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Also, IHI makes new numbers for even the smallest changes which supports your case.

Last edited by joek92; 07-15-2016 at 02:05 PM.
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Old 07-14-2016, 01:03 AM   #14
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VF22 has 6 blade compressor wheel VF39 are 6 + 6 ??? Turbine wheels may be the same size but could have more / different blades ????
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Old 07-15-2016, 02:06 PM   #15
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Quote:
Originally Posted by binny View Post
VF22 has 6 blade compressor wheel VF39 are 6 + 6 ??? Turbine wheels may be the same size but could have more / different blades ????
Interesting point. You might actually be correct.
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Old 07-30-2016, 02:43 PM   #16
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Is there any value to these twin setups?? I'm converting to Single turbo and don't want to throw it all in the bin if someone has use for them...
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Old 08-02-2016, 11:42 AM   #17
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Quote:
Originally Posted by SubieSingleCab View Post
Is there any value to these twin setups?? I'm converting to Single turbo and don't want to throw it all in the bin if someone has use for them...
Twin scroll? Or what
*edit - excuse my ignorance

Last edited by joek92; 08-03-2016 at 10:25 AM.
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Old 08-03-2016, 02:40 AM   #18
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Twin turbo - maybe paperweight ? Or small one on a motorbike
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Old 02-23-2018, 10:22 AM   #19
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Default VF22 vs VF39

Hi, everyone.
My VF22 blew through the skies (just kidding) and it no longer works. I can get a VF39 but I'm wondering if the VF22 turbine inlet (ex manifold) and downpipe flanges are the same, so the VF39 could be a bolt-on solution?

Thanks!
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Old 02-23-2018, 01:22 PM   #20
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Yes, it will bolt right on.
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Old 02-23-2018, 04:30 PM   #21
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Nice!
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Old 03-18-2018, 09:33 PM   #22
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Will the dumppipe off an vf37 turbo work on a vf38 turbo
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Old 03-19-2018, 05:26 PM   #23
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you mean downpipe right? In that case yes it should they are both twin scroll i believe.
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Old 03-21-2018, 01:14 AM   #24
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There's two types of twin scroll housings if the vf38 is off a legacy it won't fit (up pipe is different as well)
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