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blow off valve.. recirc. or

Posted by yoscoobie, May 4, 2017

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  1. yoscoobie

    yoscoobie Proven Member

    37
    3
    Joined Jan 6, 2014
    weston, Wisconsin
    I have a 1990 gsx and i have a extrude honed intake mani, 2g ported ext mani, ported head, 3'' exhaust, external dump o2 housing, Evo injectors, evo m.a.f. ... Im just getting my front mount i.c setup on, im having a chip made for my ecu, so im wondering if i should go with a recirc or atmosphere dump B.O.V ... what brand is a good cost for quality?? thanks!!
     

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  2. tunedbysaturnsl

    tunedbysaturnsl Proven Member

    114
    27
    Joined Jan 27, 2010
    Newport News, Virginia
    Recirc unless you're running SD. A lot of people are running Tial and Greddy here as aftermarket. Otherwise an Evo or 1g are good "oem" suggestions. Me, personally, I'm running a Blitz unit that's recirc'd.
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    212.4 whp   212.4 lb/ft
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  3. Jacolu3

    Jacolu3 Proven Member

    453
    50
    Joined Jan 31, 2015
    Lake Grove, New York
    If you are running a maf you need to recirculate or else your a/f will be off. The only time you can run an atmosphere bov is if you go speed density.
     
    My DSM:
    1997 Mitsubishi Eclipse GSX

    Drag Race Build

    11.7 @ 125 MPH
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    TSiAWD666 likes this.
  4. bling5tatus

    bling5tatus Proven Member

    1,250
    82
    Joined Sep 23, 2005
    DFW/Austin, Texas
    Race cars recirculate. Ricers vent. This is regardless of what air metering system is on the car.

    Also before people get all keyboard cowboy on me for saying that I'd like to mention that I'm venting to the atmosphere with a Tial but that's only because I haven't sold it to someone and bought the recirculated Tial yet. The previous owner had the Tial on a MAF car with no tuning provisions to compensate for the rich in-between shifting conditions it caused (and subsequently trashed fuel trims).
     
    My DSM:

    50trim   manual
    1991 Eagle Talon TSi

    GT35   manual
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  5. TuJay

    TuJay Proven Member

    82
    1
    Joined Aug 16, 2016
    Wadsworth, Ohio
    What is "SD" the car i just got has atmospheric and ive heard recirc. unless im running SD and I dont know what that is and I also really like the sounds LOL
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    Street Build

    T25   manual
    1998 Mitsubishi Eclipse N/T (sold)

    Street Build

      manual
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  6. tunedbysaturnsl

    tunedbysaturnsl Proven Member

    114
    27
    Joined Jan 27, 2010
    Newport News, Virginia
    Speed Density
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    212.4 whp   212.4 lb/ft
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  7. JusMX141

    JusMX141 Moderator

    12,702
    688
    Joined Dec 13, 2005
    Greensburg, Pennsylvania
    Draw-thru MAS = must recirculate if you want your car to run right. This is covered on almost every FAQ related to DSM's and isn't up for discussion.
     
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