N75 install, how to?

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  • Lighthouse
    S2Forum Addict
    • Jul 2007
    • 229
    • Country: Norway

    #1

    N75 install, how to?

    I have a S2 with a 3B engine. Can someone please tell me how to connect the N75 valve? It has 3 ports, the one in the bottom is to connect the WG, but where does the hose from the compressor side on the turbo go, the short or the long inlet pipe on the N75?*
    '10 A5 Coupè 2.0TFSI REVO
    90 quattro

    X- 91 S2 Coupè 467hp, 670nm!
  • UrS4boy
    S2Forum Obsessed
    • Feb 2006
    • 11859
    • Country: Canada

    #2
    Click on the link below and then the N75 label (live link) in the lower left corner (all the other labels are live links too). It should tell you what you need to know:

    RS2'd 93 UrS4 5 spd sedan
    94 UrS4 V8 6 spd manual avant

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    • Lighthouse
      S2Forum Addict
      • Jul 2007
      • 229
      • Country: Norway

      #3
      Thanks, but is it the long or short inlet on the N75 that vents to atmosphere?
      '10 A5 Coupè 2.0TFSI REVO
      90 quattro

      X- 91 S2 Coupè 467hp, 670nm!

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      • UrS4boy
        S2Forum Obsessed
        • Feb 2006
        • 11859
        • Country: Canada

        #4
        Originally posted by Lighthouse
        Thanks, but is it the long or short inlet on the N75 that vents to atmosphere?
        Umm...nothing vents to atmosphere, all three legs go to something.

        Maybe this helps (from the N75 article linked out of the WGFV info I pointed you to):

        RS2'd 93 UrS4 5 spd sedan
        94 UrS4 V8 6 spd manual avant

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        • newsh
          S2Forum Obsessed
          • Aug 2003
          • 16226
          • Country: United Kingdom

          #5
          The long leg goes into the MAF hose.

          S2 Coupe 3B Project


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          • UrS4boy
            S2Forum Obsessed
            • Feb 2006
            • 11859
            • Country: Canada

            #6
            Originally posted by newsh
            The long leg goes into the MAF hose.
            or aka, "intake bleed return"
            RS2'd 93 UrS4 5 spd sedan
            94 UrS4 V8 6 spd manual avant

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            • Lighthouse
              S2Forum Addict
              • Jul 2007
              • 229
              • Country: Norway

              #7
              Originally posted by UrS4boy
              or aka, "intake bleed return"
              Thats the one i was thinking of. Not using the maf anymore
              '10 A5 Coupè 2.0TFSI REVO
              90 quattro

              X- 91 S2 Coupè 467hp, 670nm!

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              • prj
                S2Forum Zealot
                • Mar 2010
                • 6308
                • Country: Estonia

                #8
                If you put it to atmosphere, then when your engine is not on boost, it will suck in unfiltered air through there.
                http://tuner.ee - http://www.facebook.com/tuner.ee

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