blow off valve?
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This is a discussion on blow off valve? within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; I just bought an 06 sti and i want to put a blow off valveon an hks ss but i ...

  1. #1
    Registered User
    Join Date
    Aug 2008

    blow off valve?

    I just bought an 06 sti and i want to put a blow off valveon an hks ss but i have heard bad things on putting blow off valves on the subbies. please advise on if i should put one on

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  3. #2
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Texas, United States
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  4. #3
    Is in Love With the Admins Here 20WRX04's Avatar
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    Nov 2004

    Welcome to the club. Please use the search function. A lot of your questions have already been covered. Read the stickies as they are very useful. Enjoy!
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  5. #4
    Registered User Black X Dahlia's Avatar
    Join Date
    Apr 2008
    baton rouge, la
    i dont mind answering. Stock=NO. Your STi is tuned to a recirculating valve, meaning the unused air is recirculated back into the intake tract, and the ecu takes a reading on that air...therefore increasing the amount of fuel being dumped by your injectors to compensate for the amount of air. If you put a Blow off valve on a stock Subie, the bov is releasing this unused air into the atmosphere, while your ecu is still dumping out the extra fuel via the extra air. Basically your engine then dumps more fuel than needed, making your car run Rich. Running Rich will waste fuel, make your engine sluggish and in the long run leave residue on valves, sparkplugs etc. reducing effectivness and might lead to repairs.

    You can put a bov if you get your ecu tuned to properly run it.
    Last edited by Black X Dahlia; 08-26-2008 at 10:39 PM.
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