Custom downpipes

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  • Pisobiker
    S2Forum Extremist
    • Jul 2003
    • 1175
    • Country: Finland

    #1

    Custom downpipes

    Hi all,

    just got an answer from the only company around here that can laser cut flanges to my specs.
    Will order a set of 10 WG outlet pipe + 10 turbine exhaust flanges (RS2-S2 specs, out of SS #304) on monday. That's a pretty big number of pieces I know , but there was no convenience in making lass then that (would spend practically the same for making 2 or 3 pieces). For keeping costs low I cannot ask them to do the job in a hurry so I actually don't exactly know how long it will take.
    Same for the SS tubing, apart from the fact I can have them + bends in 7-10 days.

    As soon as I have al the material I'll start building the first one.
    My plan is to have the outlet turbine size (58mm) diverge to the final tubing size (3" external = 72.1 mm internal, while RS2 has 66mm and S2 60mm) with a short conical diffuser that will also collect the WG duct, to maximize flow.

    Of course I'll need first to build one to have some definitve numbers. Then if I'll like the final job I'll test fit to the "mannequin" S2 I have to make sure all clearances between pipe and engine, gearbox, chassis, left axel-arm aluminum shield will be right. Then I'll take some pictures and might be able to offer some of them to those of you who might be interested. My effort will be on keeping the costs in the 210-220 euros each, if a resonable number of pieces would be required.

    There could also be the possibility of making different section downpipes for different output needs, but also different downpipe layouts for dufferent turbine and/or manifold and/or WG setups. But this might eventually be evalueted afterwards.


    If you let me know your thoughts about this I will appreciate.

    By the way, has anybody noticed downpipe clearances problems or appreciable differences while swapping from S2 header and k24 turbine to RS2 ones?


    Marco
    Last edited by Pisobiker; 17 January 2004, 13:48.
  • The Spanish
    S2Forum Maniac
    • Nov 2003
    • 719

    #2
    Thanks a lot for this work Marco.

    As you know you can count me in for a 2-3/4 inch (70mm) downpipe to connect to the 70mm center silencer and back box I just got.

    Saludos,
    Rafael
    94' RS2 Coupe TT (Twin Torsen )

    Comment

    • SteveH
      Super Moderator
      • Jul 2003
      • 4460
      • Country: United Kingdom

      #3
      Nice one Marco Hope it goes well. Keep us posted on your progress.

      Cheers,
      steve
      91 Modded 3B
      14 A6 Avant Black Edition

      Comment

      • Greg_S
        Administrator
        • Jul 2003
        • 12431
        • Country: United Kingdom

        #4
        excellent news.

        Id be after one with a larger dia than S2 turbine outlet. Will have to check nearer the time.

        ta

        Greg
        Greg

        S2Forum.com Administrator & Webmaster

        '93 Coupe with a few tweeks

        Comment

        • Doug_RS2
          S2Forum Possessed
          • Jul 2003
          • 3847
          • Home: Scotland Current: England

          #5
          Marco - I would be after a custom tubular Exhaust manifold with a custom downpipe to go with it - just whenever you have time :wacked:
          S2,RS2,S4 WB,RS4,S4 B8,RS6 C5,RS6 C6,R8

          Comment

          • Graham
            S2Forum Extremist
            • Jul 2003
            • 1622
            • Home: United Kingdom Current: Australia

            #6
            I'd love one 2 but the missus will have my balls in a Garlic crusher if i spend much more on the S2. She feels neglected, as too does the missus:nana:
            Graham
            Everything should be made as simple as possible, but not simpler.--:Albert Einstein

            Comment

            • Pisobiker
              S2Forum Extremist
              • Jul 2003
              • 1175
              • Country: Finland

              #7
              Originally posted by Doug_RS2
              Marco - I would be after a custom tubular Exhaust manifold with a custom downpipe to go with it - just whenever you have time :wacked:

              Doug I' would really like to have the chance of making tubular headers (need one for myself too) but there are some problems I'll need to get rid of before figuring out if this will be something manageble.
              First one will be availability and cost of #321 SS. #304 is the most common one and will be more than suitable for the downpipe and exhaust, but the header will need to withstand much greater heat and load stresses (turbocharger is a pretty heavy device and SS resistance drop quite consistently with heat) thus needed higher grade and quality SS. Last but not least is the longevity issue. SS has high heat dilatation so the design of it is critical, as much as the right thermal treatment for stress reliefing the whole assembly once the welding process has finished. And even so the chance of having crack issues is somehow higher than with a cast iron header.
              For this reason I was starting to think a good quality "mechanical steel" could offer better strenght and longevity while some kind of heat resistent coating could give the desired corrosion protection.

              I didn't receive so specifial and extensive material chemistry and technology techings, in my engeneering studyes, to easily go through such a topic. If someone here with the knowledge and experience could give some light, we might figure out if this is something we can manage.


              Marco

              Comment

              • S2 Ant
                S2Forum Possessed
                • Jul 2003
                • 3682
                • Country: United Kingdom

                #8
                At that price i would be interested also.......

                Might as well plan ahead, unless this is something you would be able to offer sometime down the line in the year still??
                Ant

                2007 Mk5 Golf GTi, 3 door, DSG, REVO Stg 2 and other goodies
                2011 Kawasaki Z1000

                Comment

                • Jeffer
                  S2Forum Fiend
                  • Jul 2003
                  • 2057
                  • Country: Netherlands

                  #9
                  @ Marco,

                  Cees (dutchbluers2) and I are working on it.
                  We are now making our own flanges (#321) The 321 is only produced in germany, that's why it's "hard" to get. We now ordered the 321 weld els 90 degrees and some straight bits.
                  So hopefully we can weld it together in the next month. Cees is also going to give it a heat treatment and then machine the contact surface so it's a 100% flat.

                  Here's a small pic taken from my cell phone .
                  RS2 Black - stock 315 HP
                  RS2 RS blau - stock 315 HP
                  Sport Quattro - 1005 HP
                  High Octane website

                  Comment

                  • Jeffer
                    S2Forum Fiend
                    • Jul 2003
                    • 2057
                    • Country: Netherlands

                    #10
                    another one
                    RS2 Black - stock 315 HP
                    RS2 RS blau - stock 315 HP
                    Sport Quattro - 1005 HP
                    High Octane website

                    Comment

                    • Dutch_RsBlueS2
                      S2Forum Addict
                      • Sep 2003
                      • 285
                      • Country: Netherlands

                      #11
                      I think i have seen that piece of metal before Actually i guess we`ve made that piece.

                      Indeed like Jeffer says, were on the Tubular exhaust manifold

                      We also are making our own exhaust system from turbo-back with all the mufflers.
                      When our manifold is ready we will post some info off it.

                      Cheers

                      Cees

                      Comment

                      • Pisobiker
                        S2Forum Extremist
                        • Jul 2003
                        • 1175
                        • Country: Finland

                        #12
                        Ok, I now ordered flanges and tubing.

                        If I'll get the flanges whitin a couple of weeks I might be able to have the first downpipe ready for the middle of next month (will be the 70 mm one I promised Rafael).
                        Had to face another problem today: finding the threaded SS insert for the Lambda probe.
                        Only practicable solution so far is I'll make them out of an extruded SS tube of the right size ( ) and then weld them in place.


                        Marco

                        Comment

                        • The Spanish
                          S2Forum Maniac
                          • Nov 2003
                          • 719

                          #13
                          Marco, thank you very much.
                          I will be waiting for it with my arms wide open.
                          94' RS2 Coupe TT (Twin Torsen )

                          Comment

                          • 90quattrocoupe
                            S2Forum Maniac
                            • Nov 2003
                            • 771
                            • Country: United States

                            #14
                            Marco,
                            As you know some of us in the States are doing the 20VT conversion to our cars.

                            The S2/RS2s came with humps in the floor to allow for the placement of the dual cats. The coupes and sedans in the States did not come with these humps.

                            The question I have is this. Are you planning on making use of one of these humps for placement of the cat for your custom downpipe? If you don't, then I believe you sell a few additional downpipes here in the states. Just a thought.

                            Greg.
                            They can have my car when they pry my cold dead fingers from the steering wheel.

                            Comment

                            • The Spanish
                              S2Forum Maniac
                              • Nov 2003
                              • 719

                              #15
                              I belive he uses one of the humps, to keep everything as high as possible an to prevent hitting the cat with the ground.

                              Link: http://www.s2forum.com/forum/showthr...0&pagenumber=2

                              Maybe he can do a different one for the states.
                              Attached Files
                              94' RS2 Coupe TT (Twin Torsen )

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