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Atmospheric BOV

Posted by DANT123, Nov 5, 2017

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  1. DANT123

    DANT123 Probationary Member

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    1
    Joined Nov 5, 2017
    Salt Lake, Utah
    Hello, im new here and ive read this a few times but i bought a 97 GSX with an aftermarket atmospheric BOV and a walbro 255 fuel pump and aeromotive FPR. Naturally it runs like junk. it runs really rich so I put new upstream o2 sensor but it still runs really rich and wont idle unless I unplug the MAF. Also sputters and backfires with very slow acceleration under 2.5k rpm and once i get into boost it runs fine. Do I need to get a recirculating BOV to fix this? and where can I buy an OEM one or something that would work. Thanks!
     

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  2. Dstarperformance01

    Dstarperformance01 Proven Member

    702
    123
    Joined Mar 5, 2016
    Mustang, Oklahoma
    You are venting to atmosphere after the air has been metered. You need to vent before its metered. So, you need to change maf/air metering setup. Either Gm maf or speed density is the only way to run a vented bov.
     
    My DSM:
    1993 Eagle Talon TSi AWD

    Street Build

    16g   automatic
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  3. DANT123

    DANT123 Probationary Member

    0
    1
    Joined Nov 5, 2017
    Salt Lake, Utah
    so essentially i need a recirculating BOV?
     
    Spideydsm99 likes this.
  4. Spideydsm99

    Spideydsm99 Proven Member

    227
    40
    Joined May 30, 2017
    Cherryville, North Carolina
    Bingo!
     
    My DSM:
    1997

    Street Build

      manual
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  5. Dstarperformance01

    Dstarperformance01 Proven Member

    702
    123
    Joined Mar 5, 2016
    Mustang, Oklahoma
    My DSM:
    1993 Eagle Talon TSi AWD

    Street Build

    16g   automatic
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