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    So I got under the car, there’s nothing wrong, nothing loose, tbh I think it’s the new PowerFlex poly front diff mount making a SHIT LOAD more noise in the cabin. It’s gotta be that plus the fact that I removed the sound deadening. I did also do CMP solid subframe mounts, not sure how much a role those are playing.

    I knew I was doing some questionable stuff, and yes I did read all the threads I could find. but I didn’t imagine it would increase the NVH THIS MUCH. I suppose I’ll have to just live with it for a while, until I feel like doing a big pain in the ass job to swap that out, but I feel kind of annoyed at myself for going against the sage advice of the e46 elders and proving them right yet again.

    FWIW My old mount was also poly but it was way quieter. I still have the same older poly mounts on the rear of the diff cover. I had to replace the front because I ended up having to replace the entire subframe due to uncovering negligent past repairs, and the old mount couldn’t be saved.
    http://www.natehasslerphoto.com
    '99 M3, Hellrot/Sand Beige, slicktop
    '01 M3, Imola/black

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      Originally posted by Nate047 View Post
      So I got under the car, there’s nothing wrong, nothing loose, tbh I think it’s the new PowerFlex poly front diff mount making a SHIT LOAD more noise in the cabin. It’s gotta be that plus the fact that I removed the sound deadening. I did also do CMP solid subframe mounts, not sure how much a role those are playing.

      I knew I was doing some questionable stuff, and yes I did read all the threads I could find. but I didn’t imagine it would increase the NVH THIS MUCH. I suppose I’ll have to just live with it for a while, until I feel like doing a big pain in the ass job to swap that out, but I feel kind of annoyed at myself for going against the sage advice of the e46 elders and proving them right yet again.

      FWIW My old mount was also poly but it was way quieter. I still have the same older poly mounts on the rear of the diff cover. I had to replace the front because I ended up having to replace the entire subframe due to uncovering negligent past repairs, and the old mount couldn’t be saved.
      Lol this is why poly diff bushings suck. Under certain load and RPM my poly diff bushing makes more noise than my exhaust does. Swapping back to OEM soon.
      Instagram: @logicalconclusion

      Comment


        Originally posted by EthanolTurbo View Post

        Lol this is why poly diff bushings suck. Under certain load and RPM my poly diff bushing makes more noise than my exhaust does. Swapping back to OEM soon.
        Yea dude exactly what I’m finding. Having rear interior removed is for sure exaggerating the problem too. And usually track cars have really loud exhaust that kind of masks it.
        http://www.natehasslerphoto.com
        '99 M3, Hellrot/Sand Beige, slicktop
        '01 M3, Imola/black

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          Originally posted by nahvkolaj View Post
          Got back from a little work road trip after fitting up my new 18” 219M wheels and DWS06 tires. 245/40 front and 275/35 rear. The ride is so much better now than with the old 19” stockers on Firestone summer tires.

          SMG remains happy for now with the new gear position sensor. Thinking diff clunk might be my next issue to tackle.
          Have you checked your rear diff bolts?

          Comment


            A nice polish session with griots ceramic all in one. Click image for larger version

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              Originally posted by beyondm3 View Post

              Have you checked your rear diff bolts?
              Not recently, but those got replaced with new updated bolts when I had the rear subframe out. Torqued to spec, new front mount bushing and new rear cover. It's been the same experience since I got the car.

              Comment


                Originally posted by nahvkolaj View Post

                Not recently, but those got replaced with new updated bolts when I had the rear subframe out. Torqued to spec, new front mount bushing and new rear cover. It's been the same experience since I got the car.
                When are you experiencing the diff clunk? Under what conditions do you notice it?
                2005 ///M3 SMG Coupe Silbergrau Metallic/CSL bucket seats
                Build Thread:
                https://nam3forum.com/forums/forum/m...e46-m3-journal

                Comment


                  Originally posted by karter16 View Post

                  When are you experiencing the diff clunk? Under what conditions do you notice it?
                  Shifting mostly. If I work the throttle juuuust right, I can make it pretty smooth. If I put the SMG setting at 5, I usually get a pretty big “bu-bum” type clunk from the rear.

                  I get a pretty rapid clunk I can hear in the trans tunnel and out back in slow speed 1st and Reverse (in the driveway, some parking lots).

                  SMG with CSL software and DME parameters

                  Comment


                    Originally posted by nahvkolaj View Post

                    Shifting mostly. If I work the throttle juuuust right, I can make it pretty smooth. If I put the SMG setting at 5, I usually get a pretty big “bu-bum” type clunk from the rear.

                    I get a pretty rapid clunk I can hear in the trans tunnel and out back in slow speed 1st and Reverse (in the driveway, some parking lots).

                    SMG with CSL software and DME parameters
                    Yeah I wondered if that was when. I had exactly the same thing and for the longest time I thought it was my diff itself (I'd replaced everything else). I then did a complete SMG/clutch relearn using INPA and it made for a very significant improvement in symptoms for me. Thought I'd mention that as if you haven't done it recently it might be worth doing first and seeing if it helps.

                    Edit: just noted your earlier post when you say you replaced GPS, presume you've already done this then when you replaced the GPS...
                    Last edited by karter16; 03-31-2024, 01:42 PM. Reason: added context
                    2005 ///M3 SMG Coupe Silbergrau Metallic/CSL bucket seats
                    Build Thread:
                    https://nam3forum.com/forums/forum/m...e46-m3-journal

                    Comment


                      Originally posted by karter16 View Post

                      Yeah I wondered if that was when. I had exactly the same thing and for the longest time I thought it was my diff itself (I'd replaced everything else). I then did a complete SMG/clutch relearn using INPA and it made for a very significant improvement in symptoms for me. Thought I'd mention that as if you haven't done it recently it might be worth doing first and seeing if it helps.

                      Edit: just noted your earlier post when you say you replaced GPS, presume you've already done this then when you replaced the GPS...
                      Yup did the full INPA bleed and adaptation procedure. With the new bushings and bolts, I don't know what else it could be besides internals. Feels like excess gear lash.

                      Comment


                        Originally posted by nahvkolaj View Post

                        Shifting mostly. If I work the throttle juuuust right, I can make it pretty smooth. If I put the SMG setting at 5, I usually get a pretty big “bu-bum” type clunk from the rear.

                        I get a pretty rapid clunk I can hear in the trans tunnel and out back in slow speed 1st and Reverse (in the driveway, some parking lots).

                        SMG with CSL software and DME parameters
                        Sounds like a similar experience to mine. Clunks under load and acceleration. Solid diff mounts and subframe. Ordered OEM diff covers and front bushings. I'll start there.

                        Comment


                          New fog lights and corners.

                          Click image for larger version

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                          2004 Silbergrau Metallic 6MT
                          Karbonius/OEM Snorkel/Flap/HTE Tuned
                          Ssv1/Catted Sec. 1/SS 2.5" Sec. 2/SCZA

                          OE CSL Bootlid/AS SSK/BC Coils/4.10 Gears/ Sportline 8S Wheels/Cobra Nogaros
                          RACP Plates/Vincebar/CMP/Turner RTAB/Beisan

                          2006 M6 Black Saphire SMG
                          Instagram

                          Comment


                            Originally posted by nahvkolaj View Post

                            Yup did the full INPA bleed and adaptation procedure. With the new bushings and bolts, I don't know what else it could be besides internals. Feels like excess gear lash.
                            Did you try slave cylinder/PLCD yet? I just went through something similar. It started to SLAM into reverse/1st, even occasionally it'd shut down along with it. I had a voltage issue as well that may have been more responsible but swapped in a slave/PLCD along with new alternator and battery which took care of it.

                            Additionally, may be a good idea to flush the CHF fluid if you haven't in a while.
                            2006 M3 ZCP

                            Comment


                              Originally posted by SUPREM3/// View Post

                              Did you try slave cylinder/PLCD yet? I just went through something similar. It started to SLAM into reverse/1st, even occasionally it'd shut down along with it. I had a voltage issue as well that may have been more responsible but swapped in a slave/PLCD along with new alternator and battery which took care of it.

                              Additionally, may be a good idea to flush the CHF fluid if you haven't in a while.
                              I haven't experienced slamming into 1st/R, it's the slow speed slipping to disengaged clutch where I can hear what I can only think is a combination of diff gear lash and worn dual mass flywheel jiggling.

                              I haven't flushed the system since I got the car, but maybe that's a good idea. I got a lot of bubbles out of the system last time I bled it.

                              Comment


                                Originally posted by WestBankM4 View Post

                                Your life will have changed for the better. Oil changes are an absolute breeze with this thing!
                                Well, I was surprised, I am sure I pulled everything out. Maybe 150-200ml left inside?

                                Click image for larger version

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