Wastegate recirculation

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  • SwiftE30
    E30 Modder
    • Jun 2010
    • 998

    #1

    Wastegate recirculation

    What is the general concensus with the recirculation of the wastegate? Is it more preferable to just fab a tube that expells paralllel to the downpipe into the open atmosphere, or to recirculate it back into the downpipe. Any pics would be great. And just as an FYI I have the bluntech/good & tight topmount manifold with downpipe.
    1989 E30 Zinnoberrot Vert 325i OBD1 S52 turbo;IP
  • LowR3V'in
    R3V Elite
    • Feb 2004
    • 4209

    #2
    It'll sound nicer going out the exhaust.

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    • TurboJake
      No R3VLimiter
      • Oct 2010
      • 3780

      #3
      And quieter.
      Atmosphere dump wastegates are fucking LOUD


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      • einstein57
        R3V OG
        • Jun 2007
        • 10780

        #4
        They are not that loud. But its pretty buch equivalent to having a huge exhaust leak. Gets old reall quick unless your running a 18psi spring.
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        • JTDay
          E30 Addict
          • Dec 2009
          • 521

          #5
          Ifyou have a nice exhaust, open wastegate can be bearable, and for me it is prefered. Atmospheric wastegate dump means business.

          Past: 1987 325iS, Bilsteins - HR Sports

          Present: 1999 M3, Koni Yellows - HR Sports - GC Camber Plates - UUC Swaybars - UUC SSK - AFE Intake - Stromung Catback

          2009 Mazdaspeed3, Short Ram Intake - Turbo Inlet Pipe - 2nd cat Delete - Catback - Fuel Pump Internals - Cobb Accessport - Stratified E30 tune - 294/342 - SPC Camber Arms - CPE Rear Motor Mount

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          • nando
            Moderator
            • Nov 2003
            • 34827

            #6
            Nice car, but that is really annoying!
            Build thread

            Bimmerlabs

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            • LowR3V'in
              R3V Elite
              • Feb 2004
              • 4209

              #7
              Yeah they do sound like shit.

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              • The Humjet
                E30 Addict
                • Jun 2010
                • 528

                #8
                Lol I love that sound, I would never get tired of that. I would spool up the turbo just for the sake of it even if my grandma is in the car. Then again I'm 20 years old.

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                • SwiftE30
                  E30 Modder
                  • Jun 2010
                  • 998

                  #9
                  Yeah I'm gonna go with a dump pipe back into the exhaust. Screamer pipes are too loud. So what's the preferred location to circ the pipe
                  back in? I have the good&tight downpipe/turbo elbow. Obviously going to have to make another 90 degree bend after the elbow to start the exhaust. I'm thinking that piping in the dump pipe into where the new pipe runs parallel and having the dump pipe be cut at an angle so the joint is a v shape
                  1989 E30 Zinnoberrot Vert 325i OBD1 S52 turbo;IP

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