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This is a discussion on Install FMIC? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by Mikie13 You can change to speed density kind of tuning... BOV just isn't necessary. If you need ...

  1. #16
    Registered User irickchad's Avatar
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    Quote Originally Posted by Mikie13 View Post
    You can change to speed density kind of tuning...

    BOV just isn't necessary. If you need to upgrade (pushing over 18-19lbs of boost), then get a BPV. If you absolutely have to have a BOV for the sound, then you have to deal with the negative consequences and potential issues.

    I just don't understand why some people so desperately want a Full VTA BOV on their car, in my opinion, my Forge BPV Sounds almost the same as a BOV.

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  3. #17
    zax
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    Quote Originally Posted by Rex mike View Post
    Also, i need help understanding the blow off valve situation. Is there literally no way i can use the blow off valve without running rich?
    Your options are:

    1. Run BOV with rich condition
    2. Switch to Speed Density Fueling
    3. Switch to blow-through MAF design
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    Subaru Newb MainFrame's Avatar
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    Quote Originally Posted by Rex mike View Post
    Also, i need help understanding the blow off valve situation. Is there literally no way i can use the blow off valve without running rich?

    speed density

  5. #19
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    I struggle understanding the BOV thing myself.

    My Forge BPV, when I'm under full boost (22 psi +/-) is really quite loud, particularly if I'm in the left lane with some concrete barriers to reflect the sound. I know it's not as loud as a full VTA BOV, but it's loud enough to let everyone know what's going on, with the added benefit I don't run rich between shifts, and it's quiet when I want it to be under minor levels of boost (like if I have clients in the car). A friend has the Greddy (?, it's purple) BPV which has a neat sort of whistling effect when it lets go.

    Maybe I'm just getting old, and don't want to be TOO loud, and just want people to stay off my lawn?

    IIRC, I spoke to a local tuner about converting to speed density and it was, all in, like $700+/- with a tune? I could be off on that, but I think that was kind of in the ball-park for my area.
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  6. #20
    zax
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    Quote Originally Posted by TankerTruck View Post
    I struggle understanding the BOV thing myself.
    It's really quite simple... if a BPV is vent to atmosphere (VTA), the device is releasing air from post-turbocharger to atmosphere. Any time the car vents air that has already been metered by the MAF sensor, the ECU will inject more fuel than can be burned and the motor will run rich. The way around this is to switch to Speed-Density fueling (which calculates air mass based on manifold pressure and temperature) or a blow-through MAF system (where the MAF sensor is located after the compressor close to the throttle plate) which can compensate for air mass lost post-compressor.
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