HELP!! Rear end clunking noise

[Campose82]

Originally Posted by dtla1

I was trying to diffuse the show!! lol.

I wonder if I should replace my diff bushings too. I always thought my rear end clunking was from my TC Kline Coilover setup, especially since a lot of people had confirmed a signature "Koni Clunk" (TCK's shocks are just custom valved Koni), and when I got it installed even, the shop that installed it noticed it on their own first drive and called TC Kline about it to check what they thought, and they also mentioned noise was normal.

But now you got me thinking about it. I'll add it to my list.

Replace DCT Temp/RPM Sensor
Replace bearings/bushings in DCT pump
Replace/upgrade flywheel
Replace Rod Bearings(?)
Replace diff bushings

My real issue is this stupid DCT temp warning I keep getting, but if I'm going to do that, I might as well knock out as many "related" things I can while the car is under the knife lol.

Also, yes, the show was quite entertaining, but it's a pissing match at this point. Not many people besides fe1rx are really going to take the time to gather data. With the data we do have, there are indications of improvements to be made. The only real results anybody is going to get out of it is felt in the driving dynamics, and that can be very opinion orientated sometimes.

Definitely look into diff bushings especially in your mile range im at 120 and if i were you id try to get them done before the clunking its such an annoying sound! As far as coming from suspension was my theory too i have b8 and performance springs right now that im going to change to some bc coils this weekend. Im set its the diff bushings but gave me an excuse to finally get some coil overs lol

[Jameson.e88]

not sure if you're having the same problem as me, but when I'm backing up I hear a clunk noise coming from the rear when the car comes to a stop. I think it started up when I did my rear muffler delete, but could be completely unrelated

[Campose82]

Originally Posted by Jameson.e88

not sure if you're having the same problem as me, but when I'm backing up I hear a clunk noise coming from the rear when the car comes to a stop. I think it started up when I did my rear muffler delete, but could be completely unrelated

Do you get that on even pavement or over bumps? Might be suspension or possibly diff bushings. The clunking with worn out diff bushings is any time the diff/drive shaft flexes. When accelerating from a stop or coming to a stop going into reverse. Any time the diff moves the clunking comes up. Try putting your rear seats down and take a drive thats what i did and made the clunking so much easier to pin point

[Jameson.e88]

Originally Posted by Campose82

Do you get that on even pavement or over bumps? Might be suspension or possibly diff bushings. The clunking with worn out diff bushings is any time the diff/drive shaft flexes. When accelerating from a stop or coming to a stop going into reverse. Any time the diff moves the clunking comes up. Try putting your rear seats down and take a drive thats what i did and made the clunking so much easier to pin point

i only really hear it when reversing into my garage (probably because the sound echos) , never in any other gear or coming to a stop in anything other than reverse. As far as rear seats go the rear seats in my e88 128i don't go down to my knowledge

[ShocknAwe]

Check trunk struts.

Could also be the diff itself or the inboard half shaft joints if everything else is ruled out. Had all of those myself.

The really annoying knock I had which was over bumps ended up being the sunroof tray which is under the rear half of the roof and sounded like it was coming from the rear deck/upper damper mount area.

Good luck!



PS that guy either has no clue or is trying to stir shit up. We lost our fearless leader Dack. I miss him.

[Esteban]

Originally Posted by ShocknAwe

PS that guy either has no clue or is trying to stir shit up. We lost our fearless leader Dack. I miss him.

Yeah, Dackelone would've kicked Mr Rooty Von Tooty to the curb yet again.

I miss him too...

[BMWGuy4852]

Originally Posted by WDE82

Are you fucking kidding me? What an immature response from an obvious douche bag. I suppose you've authored books on the subject of the E82 suspension? Or are you just a massive hypocrite?

The subframe bushings on E9X/E82 non-M cars are extremely soft. Have you ever taken this car apart? I've basically had my entire car in pieces over the past few years. Every system. You can move the center part of the bushing near to it's maximum extents BY HAND.

The difference between poly or M3 bushings and stock is extremely noticeable. The rear end wiggles a ton over bumps especially on power with the stock bushings. No such wiggle without them. I've even had mine out at Barber MSP where the car performed amazingly with poly RSFB. If you don't notice an improvement after a bushing swap, then you need to go buy yourself a V6 Corolla.

You're very new here and probably new to the E82. You've got no business commenting like this acting like a know-it-all when this car has been around for well over a decade. The weaknesses of the car are very well known and documented. How it responds to modifications is extremely well known and documented.

You SHOULD get an alignment after the modification, but the entire suspension is carried and controlled off the subframe so toe and camber will remain unchanged. There is a slight chance at generating a thrust angle. After doing any suspension work (other than just rear shocks) an alignment is ALWAYS a good idea and required most of the time.

Talk about an immature response, LOL. When someone doesn't agree with you, you insult them with four letter words. What are you? A clone of Trump?

As for my credentials, I have a PhD in mechanical engineering. I've worked on many engineering projects mostly in research at MIT. It doesn't matter. I've encountered many dummies like you over my career who think they know something about something. You don't, but you are too dimwitted to ever realize it, LOL!

[ShocknAwe]

Originally Posted by Esteban

Yeah, Dackelone would've kicked Mr Rooty Von Tooty to the curb yet again.

I miss him too...

Let's just all report him and get another subforum moderator to help us out.

Absolutely ridiculous behavior and unacceptable in our small community.

[MightyMouseTech]

Originally Posted by BMWGuy4852

Talk about an immature response, LOL. When someone doesn't agree with you, you insult them with four letter words. What are you? A clone of Trump?

As for my credentials, I have a PhD in mechanical engineering. I've worked on many engineering projects mostly in research at MIT. It doesn't matter. I've encountered many dummies like you over my career who think they know something about something. You don't, but you are too dimwitted to ever realize it, LOL!

PhD in Mech Eng? Ya right, more than likely still in high school from your posts. By the way, not only am I a BMW suspension specialist (my actual job title) but I have a BSc Mech Eng, so sorry, not going to bullshit me. Just stop.

[WDE82]

Originally Posted by BMWGuy4852

Talk about an immature response, LOL. When someone doesn't agree with you, you insult them with four letter words. What are you? A clone of Trump?

As for my credentials, I have a PhD in mechanical engineering. I've worked on many engineering projects mostly in research at MIT. It doesn't matter. I've encountered many dummies like you over my career who think they know something about something. You don't, but you are too dimwitted to ever realize it, LOL!

Neither douche nor hypocrite is a four letter word.

What did you do your dissertation on?

Hahahahaha

How do people like you even exist? I mean I'm positive you're a troll but making this shit up is serial killer level delusion. If you're not lying about your credentials you're still clearly soooooo incorrect. PhD doesn't mean you know anything about a car. I know of plenty of PhD engineers that can't change a flat tire.

[MightyMouseTech]

Originally Posted by WDE82

Neither douche nor hypocrite is a four letter word.

What did you do your dissertation on?

Hahahahaha

How do people like you even exist? I mean I'm positive you're a troll but making this shit up is serial killer level delusion. If you're not lying about your credentials you're still clearly soooooo incorrect. PhD doesn't mean you know anything about a car. I know of plenty of PhD engineers that can't change a flat tire.

Engineers are my absolute worst customers, at least the bad engineers are. Once had a customer with an MDX with a rattle. Got the work order, and attached was a 5 page description of the noise and what he thought the issues could be, including graphs of frequency of noise to temperature, how the noise changed with driving time, even compared to fuel octane used. Going on and on about metallurgical properties of various metals etc etc etc Started the car......yup.......reached under the car, yanked off the loose cat heat shield and threw it away. Charged him 0.5 labour. Didn't even need to bring into the shop.

[WDE82]

Originally Posted by MightyMouseTech

Engineers are my absolute worst customers, at least the bad engineers are. Once had a customer with an MDX with a rattle. Got the work order, and attached was a 5 page description of the noise and what he thought the issues could be, including graphs of frequency of noise to temperature, how the noise changed with driving time, even compared to fuel octane used. Going on and on about metallurgical properties of various metals etc etc etc Started the car......yup.......reached under the car, yanked off the loose cat heat shield and threw it away. Charged him 0.5 labour. Didn't even need to bring into the shop.

Lmao that guy might be a great analysis engineer but his hands are soft. He was trying to find the issue without touching anything just like at work.

[MightyMouseTech]

Sorry about the mess OP!

Have you found your noise yet? Has any work been done to the car recently? This sounds like it could be pad slap, as in the brake pads are loose in the brackets. Often happens with Akebono pads.

[Mr Gasser]

When you go in reverse is the sound still there? May have to check the suspension bushings, maybe the ones holding the bottom strut near the wheel, there are two on each side.

[Campose82]

Originally Posted by MightyMouseTech

Sorry about the mess OP!

Have you found your noise yet? Has any work been done to the car recently? This sounds like it could be pad slap, as in the brake pads are loose in the brackets. Often happens with Akebono pads.

All good it isn't anyones fault, guy was obviously just trynna start a mess and it worked haha. Good thing we have a good solid community backing up all enthusiasts in this forum. I tracked it down to the diff bushings ima try to tackle the install within the next few weeks. I checked pads and they are good with the retaining clips its diff related i think. Gonna start with the bushings hopefully that solves it and it isnt the driveshaft thanks though! Thats why i love this community everyone backs each other up.