PRE Tuning

PRE billet compressor wheel upgrade for IHI turbocharger

PRE billet compressor wheel

Pavel’s Racing Engines is extremely excited to offer this product to the public. We have been testing these compressor wheels in various turbocharger models and engine combinations. Every time this product proves to make more power than its cast aluminum counterpart!

We tested these compressor wheels on the dyno with a consistent 25-30WHP gain at same boost level as stock cast wheel. Torque increase was moderate as well in the mid-range engine RPM. All testing performed on same vehicles within a narrow installation time window to reduce erroneous data.

This particular post focuses on billet compressor wheels for IHI VF-series turbocharger found on JDM, USDM, and UKDM Subaru Impreza WRX and STI vehicles.


  • VF30 (JDM V5 STI)
  • VF34 (ball bearing turbo)
  • VF37 (twin scroll turbo, JDM V7/8 STI)
  • VF39 (USDM 04-06 STI)
  • VF43 (USDM 07 STI)
  • VF48 (USDM 08-15 STI)
  • VF52 (USDM 09-14 WRX, upgrade for 2008 WRX and 05-09 Legacy GT, originally VF40 or VF46)


  • 11 blade design: Conventional design is 6 tall and 6 short blades. Garrett has proven higher flow potential of the 11 blade design and it has been adopted to this compressor wheel for IHI application. 
  • Extended tip design: Conventional compressor wheel tips perpendicular to the exducer diameter. Extended tip technology originally developed as “cheater” compressor wheels for racing use. Standard exducer diameter is 60mm, while extended tip compressor wheels had 63mm exducer diameter for total blade area increase of 6%. This of it like a larger area of an airplane wing allowing for increased lift. The larger surface area allows for increased flow volume at same turbo speed. 
  • Slim blade design: Performance feature designed to increase air flow. Slim blades have a smaller cross-section allowing more area between blades for air. Flow is increased at same turbo speed. Thinner blades also weigh less for reduced moment of inertia and faster spool.
  • Slim hub design: Another feature designed to increase air flow. Slim hub increased air volume with each rotation. Flow is increased at same turbo shaft speed. Smaller cross-section hub weighs less for a reduced moment of inertia and faster spool.
  • Material selection: Conventional compressor wheels made by casting aluminum alloy. PRE compressor wheels machined from billet aluminum alloy block. Billet blocks are forged. This compacting of molecules increases material density and strength. Increased strength of billet material allows for reduced blade and hub cross-section and weight reduction without increasing internal stresses. 
  • Balancing: PRE compressor wheels inspected and computer balanced to less than 0.5g-cm^2. This does not mean compressor wheel should be swapped as-is. Stack-up dis-balance is always a factor and compressor wheel balancing should always be performed by a professional using entire rotating assembly. 

Extended tip technology comparison: black dotted line is conventional design and the red dotted line is our billet wheel design.

extended tip comp wheel

Recently we dyno tested a couple of Subaru cars and recorded data logs. To keep this an apples-to-apples comparison we tried keeping the variable to a minimum. This comparison shows a 42WHP gain at 1.5psi LESS boost than stock turbo.

Car 1 (Red Line) 2007 Subaru Impreza STI

  • Stage 1 rebuilt short block with 8.8 compression forged pistons
  • stock rebuilt cylinder heads
  • stock fuel injectors (maxed out at 21.5psi)
  • stock fuel pump
  • larger intercooler
  • Perrin inlet pipe
  • OEM rebuild VF48 turbo with cast compressor wheel (6/6 blade design)
  • ECU tuned by 555 Motorsports

Cars 2 (Blue Line) 2010 Subaru Impreza WRX sedan, 5-speed manual transmission

  • Stage 1 rebuilt short block with 8.6 compression Wiseco forged pistons
  • stock rebuild cylinder heads
  • stock fuel injectors (maxed out at 19psi due to higher flowing compressor wheel)
  • stock fuel pump
  • larger intercooler
  • Perrin inlet pipe
  • OEM VF52 turbo rebuilt with PRE billet compressor wheel (11 blade design) VF52 same size turbo as VF48. The only difference is compressor housing outlet orientation. All other internal parts same.
  • ECU tuned by 555 Motorsports

Clink image to enlarge

PRE billet compressor wheel turbo comparison with PRE watermark


You may purchase these billet compressor wheels from our eBay store:

PRE VF30 billet compressor wheel

PRE VF34 billet compressor wheel

PRE VF35 billet compressor wheel

PRE VF37 billet compressor wheel

PRE VF39 billet compressor wheel

PRE VF48 billet compressor wheel

PRE VF52 billet compressor wheel

80 Comments to PRE billet compressor wheel upgrade for IHI turbocharger

  1. Colin's Gravatar Colin
    27/01/2016 at 20:43

    So where can one purchase one of said compressor wheels, and for what price would one acquire such a masterpiece?


  2. Aaron Prado's Gravatar Aaron Prado
    06/02/2016 at 01:20

    Looking into your 11 blade billet compressor wheel for the ihi turbo.
    Is there any modification needed to make the wheel fit into a vf48? Meaning it will bolt up into a stock unmodified compressor housing? Aside from having it balanced.
    I just rebuilt this unit and wanted to upgrade wheels

  3. Joshua Sutcliffe's Gravatar Joshua Sutcliffe
    14/03/2016 at 09:04

    Hi Lads, is there any possibility this wheel will fit the VF42 on my S204? It currently makes 280awhp with max of 21psi

  4. David P.'s Gravatar David P.
    31/03/2016 at 23:27

    how difficult is it to replace the compressor wheel alone? you do not sell a kit with the wheel do you? with CHRA?

  5. Max's Gravatar Max
    14/05/2016 at 22:27

    What supporting mods would you recommend on this? Or will I be able to install and go? Also if I could find where to order.

  6. Jesse's Gravatar Jesse
    09/06/2016 at 14:15

    im opensource tuned, will i need to get another tune?

  7. Nik's Gravatar Nik
    14/06/2016 at 05:24

    Do you ship up to canada?

  8. Qhivi's Gravatar Qhivi
    21/06/2016 at 08:15

    Hi. I’m interested in the bullet wheel for a vf48. Please send me details on how to order from South Africa.

  9. Adam's Gravatar Adam
    02/07/2016 at 23:28

    Hey there, I’m interested in this billet compressor wheel for a vf52. How much does it cost? I am also interested in your turbo rebuild/upgrade service. Thanks,

  10. Mike Gibson's Gravatar Mike Gibson
    27/07/2016 at 21:05

    I have an 05 Legacy GT. It has a bunch of miles on it, but is in good shape except for some oil consumption from the turbo. I want to replace the turbo instead of the car and need some advice. I am a mechanic and have been working on gas and diesel engines (NA as well as FI) for many years, so I am able to hold an intelligent conversation on the topic but I am familiar only with stock stuff and am smart enough to know I need help. My Subaru is my daily driver and I don’t want to do anything that would compromise it’s near perfect reliability or turn it into a fuel hog, but being as I will be replacing the turbo, is there an option to “bolt on” some more power during the repair I am doing anyhow? I am happy with the power the car makes and it is quicker than most stuff on the road as is, so big money is a deal breaker when a stock turbo would fix my problem and please me just fine. Can you recommend a product that meets the narrow window I have given? Thanks!

  11. Adam's Gravatar Adam
    06/08/2016 at 19:03

    Hi can you please email me payment details as I’m interested in the billet wheel for vf52

  12. Tyrone's Gravatar Tyrone
    13/08/2016 at 08:06


    These wheels sound great. Have you got any data on upgrade performed on a VF34? I’ve got a VF34 and am trying to squeeze all the performance I can out of it.. With that kind of WHP gain in addition to e85 fuel, I’d be looking at approximately 250-270awkw theoretically.. A very tempting choice! Also purchase information to Australia would be appreciated.

    Many thanks,

  13. Niles Davis's Gravatar Niles Davis
    23/08/2016 at 20:52

    Do you have any vf52’s for sale with the billet wheel?

    24/08/2016 at 21:05


    24/08/2016 at 21:06


  16. jeremy hansen's Gravatar jeremy hansen
    07/09/2016 at 19:28

    how do I purchase this wheel?

  17. C murray's Gravatar C murray
    10/09/2016 at 19:31

    I have a Vf30 on my V7 STI that I would like to squeeze more power out of and quicken up the spool time. What would it cost for an overhaul and could it be upgraded to ball bearing? What sort of HP numbers would it be able to produce after a tune?

  18. Igor Stetsyuk's Gravatar Igor Stetsyuk
    15/11/2016 at 14:06

    Hello, please email me price and your paypal addres – we need to buy one of this – PRE billet compressor wheel upgrade for IHI VF37 turbocharger, shipped to MN 55016?

  19. Davin's Gravatar Davin
    20/11/2016 at 00:06

    Hi Team,

    I have a Vf52 I’m looking to upgrade the wheel and possibly rebuild the turbo.

    Do you have a supplier already in Australia who has them in stock?


    Can you ship to Australia?
    If so Freight on the wheel to Australia, QLD, Mountain Creek 4557

    Alternatively what’s the cost to rebuild the Core and send it back with new billet wheel if i sent the core alone to you first?


  20. Davin's Gravatar Davin
    21/11/2016 at 21:00

    Cheers, So you won’t need the the intake or exhaust housing? Just need the core to rebuild and install new billet wheel?
    No modification required to housings to fit new billet wheel?

  21. Mark Mineault's Gravatar Mark Mineault
    27/11/2016 at 00:16

    Do you ship to Canada? If so I would like to purchase one for a vf48.

  22. Jason's Gravatar Jason
    29/11/2016 at 00:48

    Hey do you have a billet compressor wheel for the vf22?
    Inducer Diameter : 47.2 mm
    Exducer Diameter : 60 mm
    Bore Dia: 6.12 mm

  23. Kimmo Lairi's Gravatar Kimmo Lairi
    12/12/2016 at 19:28

    Hi.I got IHI VF 35.Do you have compressor billet wheel for that,i think it has same comp wheel as IHI 34.Live in Finland,do you ship here.

  24. Dan's Gravatar Dan
    15/12/2016 at 00:07

    Hello, I would be interested in the vf52. Do you have plan ton make a ball bearing conversion in near future?

  25. Dan's Gravatar Dan
    15/12/2016 at 03:32

    Thanks for fast answer. Do you have a price for that vf52 ball bearing? Could you give me a more precise date for availability? I would like to fit that upgrade in my next setup before the 2017 autocross season if it can fit in the budget

  26. Shayne Martella's Gravatar Shayne Martella
    17/01/2017 at 04:13

    I sent you guys an email about getting a billet wheel for my vf48 but haven’t heard back yet. I really need to get my hands on one so I can get my car back together. Where/how do I buy one?

  27. 26/01/2017 at 11:33

    Hi I want to buy a billet wheel for my vf39 as soon a possible. Please let me know if you have them in stock. Thanks!

  28. Ben Stilwell's Gravatar Ben Stilwell
    30/01/2017 at 16:54

    Hi, I am interested in your billet compressor wheel and rebuild for my vf52. I was wondering how fast of a turn around it would be after you received my turbo?

  29. Tom's Gravatar Tom
    01/03/2017 at 10:31

    Would this work on a 88 thunderbird IHI ?

  30. Dan's Gravatar Dan
    12/03/2017 at 19:51

    Hello, is your ball bearing conversion is ready for vf52? Can you send me info please

  31. Dan's Gravatar Dan
    12/03/2017 at 19:52

    Hello. Is your ball bearing conversion is ready for vf52? Can you send me info please

  32. jalal's Gravatar jalal
    14/06/2017 at 01:28

    hello Pavel

    what are the dimensions of this wheel? does it require any modification to the stock compressor housing? turbo is vf49

    kind regards

  33. 16/06/2017 at 20:57

    Love this compressor wheel!!! Finally got tuned and man.. Picked up 30whp and boosts earlier than stock, nice gut punch I LOVE IT!! Than you Pavel for such an amazing piece! Much easier doing the whole CHRA!

  34. Khadaji's Gravatar Khadaji
    22/06/2017 at 23:28

    Do you offer a replacement wheel for a vf29 (Ver6 STI)?

  35. Chris's Gravatar Chris
    01/07/2017 at 00:24

    I would like to purchase a compressor wheel for my vf39, or have you guys rebuild it to get more out of it. Can you send me prices on both.

  36. Alex's Gravatar Alex
    18/07/2017 at 00:45

    I am in Australia and looking at purchasing a VF52 comp billet wheel.
    Do you ship to Aus?

    Thanks, Alex

  37. John's Gravatar John
    21/09/2017 at 17:45

    Hey there Pavel. Looking to upgrade my Vf52. Very interested in your PRE wheel and would like to get more information. Please email me thank you

  38. Peter Koigi's Gravatar Peter Koigi
    04/10/2017 at 06:02

    I own a 2004 JDM forester Sti using the VF41. Do you have a billet wheel upgrade for this turbo. And how much would it cost for a full rebuild on this turbo.

  39. 05/10/2017 at 12:48

    I have IHI RHB5 VF11 turbo from Subaru Legacy and want to upgrade my compressor with billet one, can you supply it?
    extended turbo model:
    VF11 RHB52XW-52002XP15NRBRLL4016EZ

    Best regards.

  40. Ryan's Gravatar Ryan
    07/10/2017 at 12:11

    Do you have any compressor upgrades for a VF-22? I currently have one that looks like it ate a rock.

  41. Jeff Flanagan's Gravatar Jeff Flanagan
    01/11/2017 at 21:59

    Hi do you have a vf52 with a billet wheel in stock right now? And if so, ho9w much$?

  1. By on 25/01/2016 at 00:10

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