F80 differential movement.

VoidCruiser · 11-13-2023, 05:27 PM

Is this much differential movement normal of the F80? Brand new Oem diff bushing.
I drove my buddies f82 and his diff is WAY quieter than mine with almost no movement that I could tell from the driver seat. Granted he does have aftermarket bushings. Mine clanks and smacks like a mf and it’s really annoying. I get some really bad wheel hope sometimes too. In the video the rear end is jacked up and engaging in first gear with firm braking in between.

https://youtube.com/shorts/qnL7G6xu1...IVZTmrezpuXwZj

Idfkman · 11-13-2023, 09:21 PM

Mine are getting really bad at 50k miles. Planning to swap to a brace with dual subframe mounting points and poly bushings at some point.

Anybody have recommendations on a kit?

theweebabySeamus · 11-14-2023, 11:05 AM

I got mine replaced with an OE (newer design) bushing and I feel more movement than I anticipated too. I'll be going to the dual mount bracket soon, though Im undecided on PF poly or another OE.

hC1001 · 11-14-2023, 11:20 AM

Im pretty sure its not only the diff that is moving. Most likely the motor and tranny mounts might be worn too and causing more drivetrain movement.

Track/S · 11-14-2023, 04:02 PM

Quote:

Originally Posted by Idfkman

Mine are getting really bad at 50k miles. Planning to swap to a brace with dual subframe mounting points and poly bushings at some point.

Anybody have recommendations on a kit?

I have lift kit version with dual points poly bushings.

Idfkman · 11-14-2023, 04:37 PM

Looks good! Does the subframe need to be dropped for install? Also, what’s pricing for the kit?

drroc · 11-14-2023, 11:13 PM

https://www.bimmerworld.com/Powerfle...-M2-M3-M4.html
This kit can be installed w/o dropping the subframe. I am using the track bushings since I track the car, and its not too bad on the street.

VoidCruiser · 11-15-2023, 10:47 AM

Quote:

Originally Posted by hC1001

Im pretty sure its not only the diff that is moving. Most likely the motor and tranny mounts might be worn too and causing more drivetrain movement.

Motor mounts were replaced at the same time.

theweebabySeamus · 11-15-2023, 11:12 AM

Quote:

Originally Posted by VoidCruiser

Motor mounts were replaced at the same time.

How did they look when they came out?

VoidCruiser · 11-16-2023, 07:42 PM

Quote:

Originally Posted by theweebabySeamus

How did they look when they came out?

Solid. But replaced them since the engine was already lifted

RAT3DM · 11-17-2023, 01:24 AM

Quote:

Originally Posted by Idfkman

Mine are getting really bad at 50k miles. Planning to swap to a brace with dual subframe mounting points and poly bushings at some point.

Anybody have recommendations on a kit?

Did the complete rear subframe ECS kit on mine.

theweebabySeamus · 11-18-2023, 03:20 PM

Anybody ever just done Powerflex rears on a dual mount and left the front bushings alone?

herbotis · 12-14-2023, 12:32 PM

Quote:

Originally Posted by theweebabySeamus

Anybody ever just done Powerflex rears on a dual mount and left the front bushings alone?

Yeap. Nothing to note as far as NVH go. It was like OEM to me.

Quote:

Originally Posted by Idfkman

Mine are getting really bad at 50k miles. Planning to swap to a brace with dual subframe mounting points and poly bushings at some point.

Anybody have recommendations on a kit?

I changed mine out using Powerflex STREET bushings for all 4 in front and 2 in rear (added the missing bushing). Install was a bit of a pain, and there's a touch more diff noise though it's welcomed for me.

papasmurf_m3 · 12-15-2023, 02:30 PM

Quote:

Originally Posted by VoidCruiser

Is this much differential movement normal of the F80? Brand new Oem diff bushing.
I drove my buddies f82 and his diff is WAY quieter than mine with almost no movement that I could tell from the driver seat. Granted he does have aftermarket bushings. Mine clanks and smacks like a mf and it’s really annoying. I get some really bad wheel hope sometimes too. In the video the rear end is jacked up and engaging in first gear with firm braking in between.

https://youtube.com/shorts/qnL7G6xu1...IVZTmrezpuXwZj

So the movement got worse when you replaced the bushing with the upgraded OEM poly mount?

That doesn't sound promising. I'm about to upgrade my stock bushing for the same 2018 poly mount. I'm expecting it to feel a little tighter definitely not looser.

theweebabySeamus · 12-15-2023, 03:17 PM

Quote:

Originally Posted by papasmurf_m3

So the movement got worse when you replaced the bushing with the upgraded OEM poly mount?

That doesn't sound promising. I'm about to upgrade my stock bushing for the same 2018 poly mount. I'm expecting it to feel a little tighter definitely not looser.

Having done that, I wouldn't do only one bushing. I did that and am going to have the dual mount installed shortly. Also going to replace the front with new OE bushings as I think they got worn from the OE rear bushing that failed.

papasmurf_m3 · 12-23-2023, 11:20 PM

Quote:

Originally Posted by theweebabySeamus

Having done that, I wouldn't do only one bushing. I did that and am going to have the dual mount installed shortly. Also going to replace the front with new OE bushings as I think they got worn from the OE rear bushing that failed.

I was thinking the same. Upon inspection, the fronts looked ok it was just the rear that had a small crack in it. It wasn't collapsed.

Replaced with an ECS poly rear mount and it seems good. Not gonna go any more bracing on the diff, I'm good with how it feels stock or better. I don't want crazy NVH.

After Christmas I'll take the car out on a proper drive.

NORAGRETS · 12-28-2023, 01:12 PM

Quote:

Originally Posted by VoidCruiser

Is this much differential movement normal of the F80? Brand new Oem diff bushing.
I drove my buddies f82 and his diff is WAY quieter than mine with almost no movement that I could tell from the driver seat. Granted he does have aftermarket bushings. Mine clanks and smacks like a mf and it’s really annoying. I get some really bad wheel hope sometimes too. In the video the rear end is jacked up and engaging in first gear with firm braking in between.

https://youtube.com/shorts/qnL7G6xu1...IVZTmrezpuXwZj

wish I could watch the vid and let u know but its private

papasmurf_m3 · 12-31-2023, 02:01 PM

Seems ok. Noticeably tighter, a bit more nvh at highway speeds. But, I'm currently on my R compounds so they are noisy tires.

Telluride · 12-31-2023, 02:31 PM

Not liking the harsh drive train shuddering caused by occasional wheel hop, I found this thread helpful and went with the KMP solution, which appears to be same as Team Schirmer.

Having a lowered car I liked how their offset bushings correct driveshaft tilt. Wish I did this upgrade long ago. Eliminates wheel hop. And while the more solid bushings do introduce a bit more NVH... not intrusive by any means.

Get above ~70mph and gear whine will become much more perceptible. Sounds really good... and approaching 100mph+ intoxicating... huh?!!

However, it is not as loud as in the video which has rear seat delete, etc.

https://f87.bimmerpost.com/forums/sh....php?t=1834869

11-13-2023, 05:27 PM	#1
VoidCruiser Enlisted Member 17 Rep 42 Posts Drives: BMW M3 Join Date: Oct 2023 Location: Portland iTrader: (0)	Is this much differential movement normal of the F80? Brand new Oem diff bushing. I drove my buddies f82 and his diff is WAY quieter than mine with almost no movement that I could tell from the driver seat. Granted he does have aftermarket bushings. Mine clanks and smacks like a mf and it’s really annoying. I get some really bad wheel hope sometimes too. In the video the rear end is jacked up and engaging in first gear with firm braking in between. https://youtube.com/shorts/qnL7G6xu1...IVZTmrezpuXwZj
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11-13-2023, 09:21 PM	#2
Idfkman Lieutenant 473 Rep 468 Posts Drives: F80 M3 Join Date: Sep 2018 Location: Maryland iTrader: (1)	Mine are getting really bad at 50k miles. Planning to swap to a brace with dual subframe mounting points and poly bushings at some point. Anybody have recommendations on a kit? __________________ 10 E90 M3 /// Dinan Intake, X Pipe, Exhaust, Underdrive, 3.62 Diff, Coilovers, Alpine e85 Tune - sold 16 F80 M3 /// MaxPSI 4 Pin, DP, CP, SL Mid-Pipe, TMIC, KW HAS, EU5's, AB Performance Flex Tuned
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11-14-2023, 11:05 AM	#3
theweebabySeamus Captain 384 Rep 922 Posts Drives: M3 Join Date: Jul 2014 Location: Bay Area iTrader: (1)	I got mine replaced with an OE (newer design) bushing and I feel more movement than I anticipated too. I'll be going to the dual mount bracket soon, though Im undecided on PF poly or another OE.
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11-14-2023, 11:20 AM	#4
hC1001 Major 610 Rep 1,014 Posts Drives: E36 M3, F80 M3 Join Date: Nov 2019 Location: Brooklyn, NY iTrader: (4)	Im pretty sure its not only the diff that is moving. Most likely the motor and tranny mounts might be worn too and causing more drivetrain movement.
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11-14-2023, 04:37 PM	#6
Idfkman Lieutenant 473 Rep 468 Posts Drives: F80 M3 Join Date: Sep 2018 Location: Maryland iTrader: (1)	Looks good! Does the subframe need to be dropped for install? Also, what’s pricing for the kit? __________________ 10 E90 M3 /// Dinan Intake, X Pipe, Exhaust, Underdrive, 3.62 Diff, Coilovers, Alpine e85 Tune - sold 16 F80 M3 /// MaxPSI 4 Pin, DP, CP, SL Mid-Pipe, TMIC, KW HAS, EU5's, AB Performance Flex Tuned
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11-14-2023, 11:13 PM	#7
drroc Lieutenant 425 Rep 522 Posts Drives: 2015 M3 - 6MT Join Date: Dec 2016 Location: San Jose iTrader: (2)	https://www.bimmerworld.com/Powerfle...-M2-M3-M4.html This kit can be installed w/o dropping the subframe. I am using the track bushings since I track the car, and its not too bad on the street.
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11-18-2023, 03:20 PM	#12
theweebabySeamus Captain 384 Rep 922 Posts Drives: M3 Join Date: Jul 2014 Location: Bay Area iTrader: (1)	Anybody ever just done Powerflex rears on a dual mount and left the front bushings alone?
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12-31-2023, 02:01 PM	#18
papasmurf_m3 Captain 455 Rep 844 Posts Drives: YMB F80 M3 Join Date: Apr 2019 Location: LA iTrader: (0)	Seems ok. Noticeably tighter, a bit more nvh at highway speeds. But, I'm currently on my R compounds so they are noisy tires. __________________ 60-130 mph 6.72 secs 1/2 mile trap speed 158 mph ecutek - bend calibration pro tune - flex fuel - mpe - stock turbos - oem+
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12-31-2023, 02:31 PM	#19
Telluride Private First Class 136 Rep 116 Posts Drives: 2020 M2C Join Date: Mar 2022 Location: Chicago iTrader: (0)	Not liking the harsh drive train shuddering caused by occasional wheel hop, I found this thread helpful and went with the KMP solution, which appears to be same as Team Schirmer. Having a lowered car I liked how their offset bushings correct driveshaft tilt. Wish I did this upgrade long ago. Eliminates wheel hop. And while the more solid bushings do introduce a bit more NVH... not intrusive by any means. Get above ~70mph and gear whine will become much more perceptible. Sounds really good... and approaching 100mph+ intoxicating... huh?!! However, it is not as loud as in the video which has rear seat delete, etc. https://f87.bimmerpost.com/forums/sh....php?t=1834869
	Appreciate 0 Quote