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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; What about when u first get in the car and start it up not warming the motor up and vaule ...

  1. #11731
    Registered User Z31_2011's Avatar
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    What about when u first get in the car and start it up not warming the motor up and vaule doesn't open up. Till it warms up is that normal


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  3. #11732
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    Quote Originally Posted by Z31_2011 View Post
    What about when u first get in the car and start it up not warming the motor up and vaule doesn't open up. Till it warms up is that normal


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    There's a chance the valve could be leaking.
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  4. #11733
    Registered User Z31_2011's Avatar
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    We'll put Hydraulic oil didn't have no promblem with it yesterday but was over 60 degrees out side


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  5. #11734
    Registered User Z31_2011's Avatar
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    U think the gasket would cause it it's got like a crease in it but other then that everything tight


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  6. #11735
    Pro Manscaper Mikie13's Avatar
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    Hello, grammar? Are you there?
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  7. #11736
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    Quote Originally Posted by Z31_2011 View Post
    U think the gasket would cause it it's got like a crease in it but other then that everything tight


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    Could be.
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  8. #11737
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    Building an intake for my GFB BOV?

    Hi, today my brother and I installed a new BOV into my 2002 wrx. I either need to buy a new intake or make one because it's not giving me that sound that I want! My brother said that it might not be too much to build a new intake, but what materials would we need for that? Or would it be more time and cost effective to buy one?

  9. #11738
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    Quote Originally Posted by wrxcowgirl View Post
    Hi, today my brother and I installed a new BOV into my 2002 wrx. I either need to buy a new intake or make one because it's not giving me that sound that I want! My brother said that it might not be too much to build a new intake, but what materials would we need for that? Or would it be more time and cost effective to buy one?
    Typically BOV or 'Blow Off Valve' means they discharge the air out to the atmosphere. If your is so, the sound should be loud and clear regardless of the intake. But from what you say I presume that you actually installed a BPV of ‘ByPass Valve’ that works virtually like stock (hence the lack of sound). If you want sound without throwing off your MAF readings too much, you can get a hybrid valve that can both recirculate the air to the intake and discharge it to atmosphere. However some have reported reliability issues with such valve so you might want to research before making a decision.

    As for making an intake, this is very ill advised. The intake houses the MAF sensor that is a precisely calibrated sensor that measures the air coming into the engine. Modifying the shape and size of the piping around it will throw off it reading and the ECU won’t be able to run the engine properly.

    You might want to start by reading those before making any decisions:
    BOV FAQ
    Intake FAQ
    2004 Subaru Impreza WRX
    2004 Dodge Neon SRT-4

  10. #11739
    Registered User Crazyced's Avatar
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    Quote Originally Posted by wrxcowgirl View Post
    Hi, today my brother and I installed a new BOV into my 2002 wrx. I either need to buy a new intake or make one because it's not giving me that sound that I want! My brother said that it might not be too much to build a new intake, but what materials would we need for that? Or would it be more time and cost effective to buy one?
    Typically BOV or 'Blow Off Valve' means they discharge the air out to the atmosphere. If yours is so, the sound should be loud and clear regardless of the intake. But from what you say I presume that you actually installed a BPV of ‘ByPass Valve’ that works virtually like stock (hence the lack of sound). If you want sound without throwing off your MAF readings too much, you can get a hybrid valve that can both recirculate the air to the intake and discharge it to atmosphere simultaneously. However, some have reported reliability issues with such valve so you might want to research before making a decision.

    As for making an intake, this is very ill advised. The intake houses the MAF sensor that is precisely calibrated to measures the air coming into the engine. Modifying the shape and size of the piping around it will throw off its readings and the ECU won’t be able to run the engine properly.

    You might want to start by reading those before making any decisions:
    BOV FAQ
    Intake FAQ
    2004 Subaru Impreza WRX
    2004 Dodge Neon SRT-4

  11. #11740
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    Quote Originally Posted by wrxcowgirl View Post
    Hi, today my brother and I installed a new BOV into my 2002 wrx. I either need to buy a new intake or make one because it's not giving me that sound that I want! My brother said that it might not be too much to build a new intake, but what materials would we need for that? Or would it be more time and cost effective to buy one?
    I built an intake using spare parts but you will need to tune the car for the new MAFv scaling. Unless of course you have an FEA package with CFM analysis you can use to model the airflow close to the stock design... but this will cost you at minimum $15,000.
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  12. #11741
    Pro Manscaper Mikie13's Avatar
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    Quote Originally Posted by wrxcowgirl View Post
    Hi, today my brother and I installed a new BOV into my 2002 wrx. I either need to buy a new intake or make one because it's not giving me that sound that I want! My brother said that it might not be too much to build a new intake, but what materials would we need for that? Or would it be more time and cost effective to buy one?
    Put stock BPV back on. Get SPT intake. **** biatches. Profit.
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  13. #11742
    zax
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    Quote Originally Posted by Mikie13 View Post
    Put stock BPV back on. Get SPT intake. **** biatches. Profit.
    If the name and avatar are correct, the latter might get interesting.
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  14. #11743
    UnBanned Sinister's Avatar
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    Quote Originally Posted by wrxcowgirl View Post
    Hi, today my brother and I installed a new BOV into my 2002 wrx. I either need to buy a new intake or make one because it's not giving me that sound that I want! My brother said that it might not be too much to build a new intake, but what materials would we need for that? Or would it be more time and cost effective to buy one?
    Totally not an issue to build one.... BUT. Then the MAF has to be calibrated by a tuner. Absolutely HAS to. That would include purchasing a method to tune (cobb accessport or tactrix) and then paying a professional tuner / calibrator to adjust the MAF voltage curve to match the flow that you're actually receiving.

    In short, buy a Cobb SF Intake with airbox.
    COBB Tuning - Subaru SF Intake and SF Airbox Kit
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  15. #11744
    zax
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    Quote Originally Posted by Sinister View Post
    Totally not an issue to build one.... BUT. Then the MAF has to be calibrated by a tuner. Absolutely HAS to.
    Quote Originally Posted by zax View Post
    Unless of course you have an FEA package with CFM analysis you can use to model the airflow close to the stock design... but this will cost you at minimum $15,000.
    Like I mentioned, there is an alternative, but the ROI just might not be there

    Quote Originally Posted by Sinister View Post
    That would include purchasing a method to tune (cobb accessport or tactrix) and then paying a professional tuner / calibrator to adjust the MAF voltage curve to match the flow that you're actually receiving.]
    TBH Kevie-poo-poo, MAFv scaling is perhaps one of the easiest tasks you can take-on as a self tuner. You would need a Tactrix (or Cobb) and a WBO2, but with the availability of Airboy's spreadsheet and Badnoodle's OL MAF tool, tuning the MAFv is simple as apple pie.
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  16. #11745
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    Quote Originally Posted by zax View Post
    TBH Kevie-poo-poo, MAFv scaling is perhaps one of the easiest tasks you can take-on as a self tuner. You would need a Tactrix (or Cobb) and a WBO2, but with the availability of Airboy's spreadsheet and Badnoodle's OL MAF tool, tuning the MAFv is simple as apple pie.
    I prefer just Kevie-Poo. D!ck.

    For someone with a good understanding of the vehicles, I would agree. But for someone that doesn't understand how these cars, or tuning works in general that wants to design an intake, I'm going to disagree. An understanding of resolution vs voltage, and understanding laminar vs turbulent flow, understanding open vs closed loop, etc. Also, I've seen too many times where someone is having a fueling problem, and they correct it with the MAF. A band-aid for a big problem.

    After taking EFI-101, and getting a more solid understanding of the principles behind tuning, and the physical responses that come from minor mistakes... and then seeing the bullsht from some "professionals" or "experienced home tuners" (cough cough eric) I definitely am more gun-shy on recommending someone effing with their only vehicle and tuning it themselves.
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