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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!!
     

    836  0

    1990 Mitsubishi Eclipse GSX
    manual · 1G DSM
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  2. tunedbysaturnsl

    tunedbysaturnsl Proven Member

    114
    30
    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.
     

    588  3

    1997 Mitsubishi Eclipse GST
    212.4 whp · 212.4 lb/ft · 2G DSM
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    TSiAWD666 likes this.
  3. Jacolu3

    Jacolu3 Proven Member

    459
    54
    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.
     

    Drag Race Build 5K  25

    1997 Mitsubishi Eclipse GSX
    11.7 @ 125 · 2G DSM
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  4. bling5tatus

    bling5tatus Proven Member

    1,260
    84
    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).
     

    1K  0

    4G63 1989 Dodge Colt GT
    manual · 4G63t Swapped

    2K  0

    1991 Eagle Talon TSi
    manual · 1G DSM
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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
     

    Street Build 287  1

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
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  6. tunedbysaturnsl

    tunedbysaturnsl Proven Member

    114
    30
    Joined Jan 27, 2010
    Newport News, Virginia
    Speed Density
     

    588  3

    1997 Mitsubishi Eclipse GST
    212.4 whp · 212.4 lb/ft · 2G DSM
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  7. JusMX141

    JusMX141 Moderator

    12,756
    724
    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.
     

    2K  0

    1998 Mitsubishi Eclipse GST
    manual · 2G DSM

    4K  14

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    2K  0

    1992 Eagle Talon TSi
    manual · 1G DSM

    2K  0

    1993 Eagle Talon TSi AWD
    manual · 1G DSM
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