Suspension noise possibly?

Steenos · 09-23-2015, 11:18 AM

Has anyone ever had a noise come from the rear of the car while making a slow sharp turn? It almost sounds like a grinding noise but I can't really describe the sound.

https://soundcloud.com/justin-soltau/car-sound-2

You can hear it at :10 of the track. Pokey said it sounds like a duck. Hah!

Steeler · 09-23-2015, 03:26 PM

Quote:

Originally Posted by Steenos

Has anyone ever had a noise come from the rear of the car while making a slow sharp turn? It almost sounds like a grinding noise but I can't really describe the sound.

https://soundcloud.com/justin-soltau/car-sound-2

You can hear it at :10 of the track. Pokey said it sounds like a duck. Hah!

Yup duck.

Is it repetitive if you were to drive slowly in circles either direction?

inTgr8r · 09-23-2015, 03:50 PM

That's a weird one.

Steenos · 09-23-2015, 05:36 PM

Quote:

Originally Posted by dbarton62

Yup duck.

Is it repetitive if you were to drive slowly in circles either direction?

It is repetitive but it doesn't happen all the time. Like it actually takes me a couple times to recreate the sound. I was surprised that I was even able to get a recording of the sound.

But it does happen mostly in a sharp turn or circle at low speed.

Steenos · 09-23-2015, 05:37 PM

Quote:

Originally Posted by inTgr8r

That's a weird one.

Yeah its one of those problems that makes you look insane. You always hear it but can't recreate the problem for the mechanic. Haha

The HACK · 09-23-2015, 07:09 PM

I can't hear it because of the firewall at work, but I am willing to take a wild @ss guess that it's the diff fluid. You need Castrol SAJ+F for the ///M Diff. The friction modifier (the +F) is suppose to be designed for mechanical LSDs to keep it quiet.

Steenos · 09-24-2015, 05:26 PM

Thanks Hack. Bought some Red Line Diff Fluid. I'm usually a stickler for sticking with BMW OEM stuff but not when it's 48 dollars per .5 liter. I looked at some forum posts on here and seemed like everyone was doing fine with redline and it has the friction modifiers that should help with my problem.

Hopefully going to get some help to change out the fluid this weekend as well as the seal. Anyone every done the seal before?

Steenos · 11-17-2015, 11:05 AM

I took the car to the shop last week. They checked the fluid and everything. Everything was fine. Fluid looked good and wasn't low. Anything else to check? Or should I just have them change out the fluid even if it looks good?

Jumbosock · 11-17-2015, 06:28 PM

Its hard to tell without being in the car. I would guess rubbing exhaust based on the pitch.

zimmer · 11-19-2015, 10:23 PM

That happens to mine to when I make a sharp left turn and I can't figure what's going on

DEG · 11-20-2015, 07:09 AM

Quote:

Originally Posted by zimmer

That happens to mine to when I make a sharp left turn and I can't figure what's going on

Same here. Usually that sound occurs twice...but only when the car has been sitting for a long time. After a few minutes when the drivetrain is "warmed up"...it goes away. The car is put away for the winter, but I am going to have the differential fluid checked anyhow in the Spring.

DEG · 11-20-2015, 08:09 AM

For what it's worth, I found this...

http://www.bimmerfest.com/forums/sho...d.php?t=271921

Sent from my iPhone

09-23-2015, 11:18 AM	#1
Steenos Lieutenant 56 Rep 588 Posts Drives: 2007 Z4M Coupe Join Date: Feb 2011 Location: Tennessee iTrader: (0) Garage List 2021 BMW M240i [0.00] 2007 M Coupe [0.00]	Suspension noise possibly? Has anyone ever had a noise come from the rear of the car while making a slow sharp turn? It almost sounds like a grinding noise but I can't really describe the sound. https://soundcloud.com/justin-soltau/car-sound-2 You can hear it at :10 of the track. Pokey said it sounds like a duck. Hah! __________________ 2021 m240i on order Last edited by Steenos; 09-23-2015 at 11:50 AM..
	Appreciate 0 Tweet Quote

09-23-2015, 03:50 PM	#3
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	That's a weird one. __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
	Appreciate 0 Quote

09-23-2015, 07:09 PM	#6
The HACK Midlife Crises Racing Silent but Deadly Class 1821 Rep 5,337 Posts Drives: 2006 MZ4C, 2021 Tesla Model 3 Join Date: Oct 2007 Location: Welcome to Jamaica have a nice day iTrader: (1)	I can't hear it because of the firewall at work, but I am willing to take a wild @ss guess that it's the diff fluid. You need Castrol SAJ+F for the ///M Diff. The friction modifier (the +F) is suppose to be designed for mechanical LSDs to keep it quiet. __________________ Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
	Appreciate 0 Quote

09-24-2015, 05:26 PM	#7
Steenos Lieutenant 56 Rep 588 Posts Drives: 2007 Z4M Coupe Join Date: Feb 2011 Location: Tennessee iTrader: (0) Garage List 2021 BMW M240i [0.00] 2007 M Coupe [0.00]	Thanks Hack. Bought some Red Line Diff Fluid. I'm usually a stickler for sticking with BMW OEM stuff but not when it's 48 dollars per .5 liter. I looked at some forum posts on here and seemed like everyone was doing fine with redline and it has the friction modifiers that should help with my problem. Hopefully going to get some help to change out the fluid this weekend as well as the seal. Anyone every done the seal before? __________________ 2021 m240i on order
	Appreciate 0 Quote

11-17-2015, 11:05 AM	#8
Steenos Lieutenant 56 Rep 588 Posts Drives: 2007 Z4M Coupe Join Date: Feb 2011 Location: Tennessee iTrader: (0) Garage List 2021 BMW M240i [0.00] 2007 M Coupe [0.00]	I took the car to the shop last week. They checked the fluid and everything. Everything was fine. Fluid looked good and wasn't low. Anything else to check? Or should I just have them change out the fluid even if it looks good? __________________ 2021 m240i on order
	Appreciate 0 Quote

11-17-2015, 06:28 PM	#9
Jumbosock Captain 76 Rep 987 Posts Drives: 2007 M coupe Join Date: Apr 2011 Location: San Diego iTrader: (0)	Its hard to tell without being in the car. I would guess rubbing exhaust based on the pitch. __________________ CSL headersEuro catsArqray exhaustDKF hangersEvolve TuneGenuine CSL rims10mm Macht Schnell front spacersmodified Hamann bumperTekarbon 2X2 CF spoilerTurner CF grillsAS SSKKWV3OEM Strut barRogue RSMPolyurethane anti-roll bar bushingsDeka ETX30L batteryNav Video modulefront & rear camerasIpod modulestubby antennaR-Dash LED license lights*LED Ziza interior lights
	Appreciate 0 Quote

11-19-2015, 10:23 PM	#10
zimmer Second Lieutenant 42 Rep 240 Posts Drives: 2007 Z4MC Join Date: Jul 2012 Location: NY iTrader: (0) Garage List 2007 BMW Z4 M [2.00]	That happens to mine to when I make a sharp left turn and I can't figure what's going on
	Appreciate 0 Quote

11-20-2015, 08:09 AM	#12
DEG First Lieutenant 68 Rep 321 Posts Drives: 2007 Z4 MR Join Date: Jul 2010 Location: Michigan iTrader: (0)	For what it's worth, I found this... http://www.bimmerfest.com/forums/sho...d.php?t=271921 Sent from my iPhone
	Appreciate 0 Quote