"The BIG BOV thread" (Where all bov question threads get merged) - Page 483
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This is a discussion on "The BIG BOV thread" (Where all bov question threads get merged) within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; stock turbo on a 04 sti is what ? and whats the cfm rating on it at what psi ....

  1. #7231
    Banned C89ZX7R's Avatar
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    Quick Noob Question ( no not a bov question )

    stock turbo on a 04 sti is what ? and whats the cfm rating on it at what psi .

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  3. #7232
    Registered User tayhadar1's Avatar
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    VF-39, don't know know cfm rating but the PSI is around 14.5
    2004 WRX Sti Cobb Stage 2
    GO COUGS!!!

  4. #7233
    Registered User tayhadar1's Avatar
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    And when I say 14.5 I mean that is what it is stock. I also researched but couldn't come up with any very conclusive evidence, but I believe the VF-39 flows somewhere in the area of 500CFM, don't know though
    2004 WRX Sti Cobb Stage 2
    GO COUGS!!!

  5. #7234
    Registered User darylwrx's Avatar
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    Quote Originally Posted by GFIZZLE
    sorry about posting another BOV question!! They seem to be pretty frequent around here. I was actually reading some of the problems that they cause (i.e. car running to rich). I am still debating on the first mod i want to do to my car................any suggestions??
    i say... uppipe is a good first mod. and down pipe for 2nd.. i have an turbo xs rfl.. i dont have any problem... i have a 04wrx w/4eat trans
    2004 WRX Aspen White

  6. #7235
    Moderator YBNormal07's Avatar
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    You can't find stock numbers for it either strangely enough. From what I've been able to discover, IHI has never released maps for the VF39. Some folks propose that the VF39 is closest to a T3 60 trim,or T3 Super 60. The 60 trim at peak efficiency will flow about 430 CFM buth the Super 60 is about 490.

    Turbine efficiency and HP production from a given turbo on a given setup is a very high art form. I tried to get into it at one time but quickly got lost due to a lot of conflicting information out there. You would think simple pump efficiency laws are in effect here, but apparantly this is not the case.

    The number I've always used has been 440 as if you do a HP per CFM calculation, this seems to be the average from the change in HP I've seen from various upgrades. Note there is a lot of guesswork when estimating like this, but it seems to hold out pretty good.
    Last edited by YBNormal07; 07-26-2006 at 06:26 AM.
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  7. #7236
    Registered User Hytek714's Avatar
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    what about adding a intake system....

  8. #7237
    Registered User BlkWRXWag's Avatar
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    Quote Originally Posted by darylwrx
    i say... uppipe is a good first mod
    Not on an 06
    -Max.

    06 STU STI
    2006 STU Pro Solo Natl. Champ.
    www.zzyzxmotorsports.com

  9. #7238
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    First mod = catback. Trulely is the best mod for an 06. Sounds nice and ads barley any performance, but on the other hand, you can also be prepared for a downpipe after you fix the solution of not having boost creep. =D Then after catback go get downpipe, then EM. Make sure you find a solution to the boost creep before thinkin about going to Turbo back exhaust.. this is why 3" catback is my only mod for now.

  10. #7239
    Registered User darylwrx's Avatar
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    Quote Originally Posted by BlkWRXWag
    Not on an 06
    do they have a better uppipe? uppipe is they always says
    2004 WRX Aspen White

  11. #7240
    Registered User BlkWRXWag's Avatar
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    Quote Originally Posted by darylwrx
    do they have a better uppipe? uppipe is they always says
    06's already have a catless uppipe.
    -Max.

    06 STU STI
    2006 STU Pro Solo Natl. Champ.
    www.zzyzxmotorsports.com

  12. #7241
    Registered User Jhawley's Avatar
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    Ive got it and ive had it for about 3 months now... never had an issue with it and im running stg 2 setup, its makes noise when ur in boost but if ur not in boost you hardly hear it...l guess it depends on how ur driving it
    former suby driver... current saab driver

  13. #7242
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    Greddy bov

    I am new to the world of WRX. I have been modifing american muscle cars in the past. I have a 02 WRX. Mostly stock except for exhauast from the turbo back. I have obtained a greddy bov from a friend and I want to put it on my intercooler. I noticed the flange on the stock intercooler is considerably bigger that the flange on the bov. All I have is the bov and the gasket nothing else. Is there and adapter plate out there I could use to bolt up the bov to my stock intercooler? If so where can I obtain one. I would rather buy a new top or front mount intercooler with the correct flange than weld a new flange on my stock intercooler if need be.

  14. #7243
    Registered User 02nighthawksi's Avatar
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    06 Protuned Stg2 WRB WRX
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  15. #7244
    Registered User geefunk's Avatar
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    dont install a bov on your wrx. Also, since your a n00b I'll let you knwo that there is a search button up next to the new posts button. You can find answers to almost every question you can think of about your car

  16. #7245
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    What BOV is in this video clip?

    Here is a video of 2 rex's racing and the BOV's sound nice not like the whistle type sound that I do not like. What kind of BOV is this?

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