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whats that sound. B5 S4 Gurus help!!!

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  • whats that sound. B5 S4 Gurus help!!!

    started getting a weird "woooooooo" sound the other day. the car was acting normal and sounded normal except for the exhaust was hitting the bottom of the car when i went over bumps cause i was missing the exhaust hanger that mounts to the rear diff support. i bit the bullet and ordered the part from audi. i installed the mount which was a pain in the ass but the rear of the exhaust is sitting normal finally. right after i installed the new mount i started getting the "woooooo" sound. im wondering if it might be a exhaust leak that may cause this. i do still have a exhaust leak where the mid muffler connects to the rear section of the cat back. ( SSAC twin 1 )

    i sounds like turbo spool but ive never heard it like this before. the car still boost normal and sounds normal under WOT. i can not hear the "woooo" under WOT but then again the car is loud and the exhaust might cover the "wooooo" sound.


    it seems to happen between 5-10 inHg (vac) but fade once i hit boost, it does this with and without load on the engine. really stumped and a bit paranoid. hoping its nothing to do with the little guys down there

    hear is a video of the sound, you can hear the sound through out the video. thanks guys.

    2016 VW GTI (Stock)
    2016 VW Jetta 1.4T (Stock)
    1994 Audi UrS4 - BW S257 SX-E built engine on VEMs.
    2001 Audi S4 - K04s, J-Fonz Tuned ( Gone! Dropped valve)

  • #2
    Re: whats that sound. B5 S4 Gurus help!!!

    Mine has done it since I bought it. Have always been told it is the turbos.
    Jeff


    2017 Sportwagen
    2016 .:R (sold)
    2013 Golf TDI Wolfsburg (sold)
    2001.5 Audi S4 (sold)

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    • #3
      Re: whats that sound. B5 S4 Gurus help!!!

      its just weird cause ive never heard it like that untill i installed that exhaust mount.... ive heard them spool but this sounds different
      2016 VW GTI (Stock)
      2016 VW Jetta 1.4T (Stock)
      1994 Audi UrS4 - BW S257 SX-E built engine on VEMs.
      2001 Audi S4 - K04s, J-Fonz Tuned ( Gone! Dropped valve)

      Comment


      • #4
        Re: whats that sound. B5 S4 Gurus help!!!

        Personally, I don't think it sounds normal. I'm curious for other people to comment with their thoughts.
        Jeff


        2017 Sportwagen
        2016 .:R (sold)
        2013 Golf TDI Wolfsburg (sold)
        2001.5 Audi S4 (sold)

        Comment


        • #5
          Re: whats that sound. B5 S4 Gurus help!!!

          i have a similar sound and its the turbos on mine due to open downpipes. not as loud as that tho.. or maybe it is and i'm used to it..

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          • #6
            Re: whats that sound. B5 S4 Gurus help!!!

            Originally posted by Ryan View Post
            i have a similar sound and its the turbos on mine due to open downpipes. not as loud as that tho.. or maybe it is and i'm used to it..
            when you say open dps, you mean catless? i also have catless
            2016 VW GTI (Stock)
            2016 VW Jetta 1.4T (Stock)
            1994 Audi UrS4 - BW S257 SX-E built engine on VEMs.
            2001 Audi S4 - K04s, J-Fonz Tuned ( Gone! Dropped valve)

            Comment


            • #7
              Re: whats that sound. B5 S4 Gurus help!!!

              Sounds like the air injection pump. Does it only do this when the engine is cold? My 1.8t sounds exactly like that before it warms up, and it's been doing it since I bought it four years ago.
              1990 Porsche 951
              2013 Audi S4 6MT

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              • #8
                Re: whats that sound. B5 S4 Gurus help!!!

                Originally posted by p951 View Post
                Sounds like the air injection pump. Does it only do this when the engine is cold? My 1.8t sounds exactly like that before it warms up, and it's been doing it since I bought it four years ago.

                nope, does it cold and warmed up.
                2016 VW GTI (Stock)
                2016 VW Jetta 1.4T (Stock)
                1994 Audi UrS4 - BW S257 SX-E built engine on VEMs.
                2001 Audi S4 - K04s, J-Fonz Tuned ( Gone! Dropped valve)

                Comment


                • #9
                  Re: whats that sound. B5 S4 Gurus help!!!

                  yea full catless.. i'm just stage 2+ so your turbs are probably much louder.. do you hear it highway driving or more so say driving around town? mine does it zipping along town mostly say under 70 for sure

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                  • #10
                    Re: whats that sound. B5 S4 Gurus help!!!

                    in fully catless too. i do normally hear spool and its loud. but now this id different. i hear this sound on both highway and city driving
                    2016 VW GTI (Stock)
                    2016 VW Jetta 1.4T (Stock)
                    1994 Audi UrS4 - BW S257 SX-E built engine on VEMs.
                    2001 Audi S4 - K04s, J-Fonz Tuned ( Gone! Dropped valve)

                    Comment


                    • #11
                      Re: whats that sound. B5 S4 Gurus help!!!

                      im going to take the exhaust off tomorrow morning, everything except the downpipes and see if the sound goes away. if so then ill be happy if not then with just down pipes on the sound should get louder and i can say for sure i know what it is.
                      2016 VW GTI (Stock)
                      2016 VW Jetta 1.4T (Stock)
                      1994 Audi UrS4 - BW S257 SX-E built engine on VEMs.
                      2001 Audi S4 - K04s, J-Fonz Tuned ( Gone! Dropped valve)

                      Comment


                      • #12
                        Re: whats that sound. B5 S4 Gurus help!!!

                        I'm glad you are doing this. Mine "wooo" isn't as loud, but is noticeable enough that some passengers not used to my car wind up looking for where the "siren" is coming from. My exhaust, hell my car, is stock except for a Stage 1 chip (and Tip chip).
                        Jeff


                        2017 Sportwagen
                        2016 .:R (sold)
                        2013 Golf TDI Wolfsburg (sold)
                        2001.5 Audi S4 (sold)

                        Comment


                        • #13
                          Re: whats that sound. B5 S4 Gurus help!!!

                          The woo noise is definitely your turbos. What concerns me is why it sounds like your in a tractor.
                          2006 Chevrolet Trailblazer SS. Daily. Far from stock.

                          2001.5 Audi S4. Billet rs6 and everything else. FOR SALE. $6500
                          Need this car sold.

                          1960 Ford Falcon.

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                          • #14
                            Re: whats that sound. B5 S4 Gurus help!!!

                            Originally posted by p951 View Post
                            Sounds like the air injection pump. Does it only do this when the engine is cold? My 1.8t sounds exactly like that before it warms up, and it's been doing it since I bought it four years ago.
                            NO secondary air on MT cars
                            I may appear to be nice, but don't be fooled, I probably don't like you

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                            • #15
                              Re: whats that sound. B5 S4 Gurus help!!!

                              This is 100% normal, the sound tends to be exaggerated if you have any exhaust leaks. K04 cars seem to be even louder, and the sound is more noticeable when the oil temp is lower
                              I may appear to be nice, but don't be fooled, I probably don't like you

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