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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Feb-25-2018, 03:08:54 PM   #1
NotUrAvgM
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Exclamation Fun New Noises!!! After Bushing Replacement

I just finished doing some rear end work on my buddy's E46 M3...

I installed:
- AKG subframe reinforcements
- AKG 75D subframe bushings
- AKG 95A diff bushings
- Rogue tranny mounts
- New BMW bolts/studs for everything above, as well as axles and driveshaft

- Everything is definitely torqued to spec and nothing was abnormal about install.
- All driveshaft components seemed in good condition
- Axle CVs have a little play

Now we have some new noises. In the higher gears (4, 5) at around 2000 if you are hard on the gas and then snap off abruptly, you get like a trio of clunks/rattles from the rear. To me it sounds like the diff is hunting between gear faces to take up lash. However I have no idea about how the E46 M diff lockup works and what could be exacerbated new bushings. It seems louder than it should be. Car has 134k on it.

I've done this procedure on my E36 M3 track car before so I am confident nothing with the install is wrong.

I am going to stick a GoPro under there at the end of the week to look at at diff movement.

Any thoughts in the interim?
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-Matt

[2004 330xi/6] Orient/Natural :: 147k :: ZSP :: ZPP :: ZCW
[1998 M3/4/5] Cosmos/Black :: 126k ::TCKline D/A (500/600) :: GC plates :: RD Sways :: GC Rear Arms :: BW FCAB :: BW RTAB :: AKG Subframe :: 3.64 Diffsonline :: TMS Pulleys :: AA + Borla :: XBrace :: AS SSK :: ZHP Rack :: M50 :: DTC60 :: Direzza ZIII :: Safety Equipment

Past:
[1995 M3] Avus/Dove :: 242k :: S52 OBDI :: M50 manifold :: 3.5" HFM :: Turner Chip :: XBrace :: SS Lines :: Turner RTABS :: Vogtland CS :: Bilstein Sport
[1999 M3] Cosmos/Black :: 87k :: TCKline S/A (400/500) :: Turner plates :: UUC Front Sway :: PF RTABs :: AA Intake :: Borla :: XBrace :: TRM C2s :: CL RC6E :: Direzza ZII :: Safety Equipment
[1993 325is] Brilliant/Black :: 139k :: Bilstein sports :: Eibach sways and springs :: Dinan camber plates and chip :: Borla :: LSD
[1983 320i] Safari/Brownish :: 242k :: homebrew CAI :: some rust :: multicolor body panels
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Old Sun, Feb-25-2018, 03:18:39 PM   #2
M3_Pilot
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Default Re: Fun New Noises!!! After Bushing Replacement

I thought the draw backs from anything other than oem bushings were there harshness and noise?
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Old Sun, Feb-25-2018, 03:20:17 PM   #3
NotUrAvgM
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Default Re: Fun New Noises!!! After Bushing Replacement

Quote:
Originally Posted by M3_Pilot View Post
I thought the draw backs from anything other than oem bushings were there harshness and noise?
Well yeah This is just harsher than I figured. Granted usually you aren't putzing around in 5th at 2krpm.
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-Matt

[2004 330xi/6] Orient/Natural :: 147k :: ZSP :: ZPP :: ZCW
[1998 M3/4/5] Cosmos/Black :: 126k ::TCKline D/A (500/600) :: GC plates :: RD Sways :: GC Rear Arms :: BW FCAB :: BW RTAB :: AKG Subframe :: 3.64 Diffsonline :: TMS Pulleys :: AA + Borla :: XBrace :: AS SSK :: ZHP Rack :: M50 :: DTC60 :: Direzza ZIII :: Safety Equipment

Past:
[1995 M3] Avus/Dove :: 242k :: S52 OBDI :: M50 manifold :: 3.5" HFM :: Turner Chip :: XBrace :: SS Lines :: Turner RTABS :: Vogtland CS :: Bilstein Sport
[1999 M3] Cosmos/Black :: 87k :: TCKline S/A (400/500) :: Turner plates :: UUC Front Sway :: PF RTABs :: AA Intake :: Borla :: XBrace :: TRM C2s :: CL RC6E :: Direzza ZII :: Safety Equipment
[1993 325is] Brilliant/Black :: 139k :: Bilstein sports :: Eibach sways and springs :: Dinan camber plates and chip :: Borla :: LSD
[1983 320i] Safari/Brownish :: 242k :: homebrew CAI :: some rust :: multicolor body panels
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Old Sun, Feb-25-2018, 04:33:41 PM   #4
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Default Re: Fun New Noises!!! After Bushing Replacement

Poly diff bushings will make your car way more noisy. I learned that the hard way, and was worried I didn’t do something right like you. Rattles Im not sure about, but the clunk when letting off gas and shifting is a by product of stiff bushings


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Old Sun, Feb-25-2018, 04:36:29 PM   #5
NotUrAvgM
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Default Re: Fun New Noises!!! After Bushing Replacement

Yeah I have solid diff bushings and 95A subframe on my E36, and while it whines like a jet engine compressor it doesn't do this weird clunk stuff. I'm guessing it's an M diff thing.
__________________
-Matt

[2004 330xi/6] Orient/Natural :: 147k :: ZSP :: ZPP :: ZCW
[1998 M3/4/5] Cosmos/Black :: 126k ::TCKline D/A (500/600) :: GC plates :: RD Sways :: GC Rear Arms :: BW FCAB :: BW RTAB :: AKG Subframe :: 3.64 Diffsonline :: TMS Pulleys :: AA + Borla :: XBrace :: AS SSK :: ZHP Rack :: M50 :: DTC60 :: Direzza ZIII :: Safety Equipment

Past:
[1995 M3] Avus/Dove :: 242k :: S52 OBDI :: M50 manifold :: 3.5" HFM :: Turner Chip :: XBrace :: SS Lines :: Turner RTABS :: Vogtland CS :: Bilstein Sport
[1999 M3] Cosmos/Black :: 87k :: TCKline S/A (400/500) :: Turner plates :: UUC Front Sway :: PF RTABs :: AA Intake :: Borla :: XBrace :: TRM C2s :: CL RC6E :: Direzza ZII :: Safety Equipment
[1993 325is] Brilliant/Black :: 139k :: Bilstein sports :: Eibach sways and springs :: Dinan camber plates and chip :: Borla :: LSD
[1983 320i] Safari/Brownish :: 242k :: homebrew CAI :: some rust :: multicolor body panels
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Old Sun, Feb-25-2018, 06:42:04 PM   #6
duracellttu
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Default Re: Fun New Noises!!! After Bushing Replacement

Going back to OEM diff bushing will solve 90% of this. I did the exact same poly bushing setup you have. The last 10% is in the stiffer subframe bushings. It was too much work for me to go back and change out those, so I left them. It’s tolerable now where before it was horrible.
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Evolve-R | AP V2 Headers | CPI Euro200R (200 cell) | SS Non-res X-pipe + Race | 3.91 w/ 3 stage clutch | TCK SA 450/500 | Vorshlag Camber Plates
Rogue Engineering ASP, RSM, RTABs, TM | TMS Sway Bars, Camber Arms, Pullies | Mason Race Strut, Rear X-Brace | AS 30% SSK | aFe Stage 2 | SPAL Fan
AKG FCABs, SFB | Redish Reinforcement | Turbo Toys V2 Hub | WPC Treated Rod Bearings
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Old Sun, Feb-25-2018, 07:05:24 PM   #7
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Default Re: Fun New Noises!!! After Bushing Replacement

Sounds like the front diff bolt is loose. It takes an incredible amount of torque to tighten. Sometimes things come loose once driving. Check the two “low torque” rear torx bolts for the rear diff too.

I’m running OEM diff bushings, solid subframe bushings, and monoball RTAB bushings. I have no extra noises or vibration from OEM.
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Old Sun, Feb-25-2018, 07:07:01 PM   #8
NotUrAvgM
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Default Re: Fun New Noises!!! After Bushing Replacement

128 on a torque wrench. I didn't best-guess it lol.
__________________
-Matt

[2004 330xi/6] Orient/Natural :: 147k :: ZSP :: ZPP :: ZCW
[1998 M3/4/5] Cosmos/Black :: 126k ::TCKline D/A (500/600) :: GC plates :: RD Sways :: GC Rear Arms :: BW FCAB :: BW RTAB :: AKG Subframe :: 3.64 Diffsonline :: TMS Pulleys :: AA + Borla :: XBrace :: AS SSK :: ZHP Rack :: M50 :: DTC60 :: Direzza ZIII :: Safety Equipment

Past:
[1995 M3] Avus/Dove :: 242k :: S52 OBDI :: M50 manifold :: 3.5" HFM :: Turner Chip :: XBrace :: SS Lines :: Turner RTABS :: Vogtland CS :: Bilstein Sport
[1999 M3] Cosmos/Black :: 87k :: TCKline S/A (400/500) :: Turner plates :: UUC Front Sway :: PF RTABs :: AA Intake :: Borla :: XBrace :: TRM C2s :: CL RC6E :: Direzza ZII :: Safety Equipment
[1993 325is] Brilliant/Black :: 139k :: Bilstein sports :: Eibach sways and springs :: Dinan camber plates and chip :: Borla :: LSD
[1983 320i] Safari/Brownish :: 242k :: homebrew CAI :: some rust :: multicolor body panels
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Old Sun, Feb-25-2018, 07:08:28 PM   #9
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Default Re: Fun New Noises!!! After Bushing Replacement

I believe it’s higher. 154 or something. I know when I torqued it to 143 because my wrench couldn’t only go that high, my noises went away. Just had to borrow a buddy’s big wrench to get it tighter.
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Old Sun, Feb-25-2018, 07:36:27 PM   #10
NotUrAvgM
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Default Re: Fun New Noises!!! After Bushing Replacement

This isn't a loose diff kind of thunk. You can mash the gas as hard as you wish or hop off the gas at higher rpm with no noise.
__________________
-Matt

[2004 330xi/6] Orient/Natural :: 147k :: ZSP :: ZPP :: ZCW
[1998 M3/4/5] Cosmos/Black :: 126k ::TCKline D/A (500/600) :: GC plates :: RD Sways :: GC Rear Arms :: BW FCAB :: BW RTAB :: AKG Subframe :: 3.64 Diffsonline :: TMS Pulleys :: AA + Borla :: XBrace :: AS SSK :: ZHP Rack :: M50 :: DTC60 :: Direzza ZIII :: Safety Equipment

Past:
[1995 M3] Avus/Dove :: 242k :: S52 OBDI :: M50 manifold :: 3.5" HFM :: Turner Chip :: XBrace :: SS Lines :: Turner RTABS :: Vogtland CS :: Bilstein Sport
[1999 M3] Cosmos/Black :: 87k :: TCKline S/A (400/500) :: Turner plates :: UUC Front Sway :: PF RTABs :: AA Intake :: Borla :: XBrace :: TRM C2s :: CL RC6E :: Direzza ZII :: Safety Equipment
[1993 325is] Brilliant/Black :: 139k :: Bilstein sports :: Eibach sways and springs :: Dinan camber plates and chip :: Borla :: LSD
[1983 320i] Safari/Brownish :: 242k :: homebrew CAI :: some rust :: multicolor body panels
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Discussing Fun New Noises!!! After Bushing Replacement in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)