Frequency of motor mount change

8600RPM · 12-13-2016, 11:26 AM

So I'm at 30k in a 2013, did 10 track days this year but prior miles were not aggressive, no standing launches . Mounts are destroyed and getting replaced under warranty. I noticed a clunk in hard acceleration. I run r comps and imagine in general the forces on a car at the track with heavy braking alone really stress the mounts. How often are people replacing them

dparm · 12-13-2016, 11:40 AM

Quote:

Originally Posted by 8600RPM

So I'm at 30k in a 2013, did 10 track days this year but prior miles were not aggressive, no standing launches . Mounts are destroyed and getting replaced under warranty. I noticed a clunk in hard acceleration. I run r comps and imagine in general the forces on a car at the track with heavy braking alone really stress the mounts. How often are people replacing them

Your motor mounts are bad at just 30k? And they're replacing them under warranty despite track usage? Wow.

What was the specific failure?

gan1hck · 12-13-2016, 12:33 PM

I have a 2012.

Tracking it since 2012....8 or so weekends a year.

A little over 40,000 miles...just had my mounts replaced...just after warranty.

8600RPM · 12-13-2016, 12:37 PM

Quote:

Originally Posted by dparm

Your motor mounts are bad at just 30k? And they're replacing them under warranty despite track usage? Wow.

What was the specific failure?

Why woukdnt they warranty it? 30k of hard driving stresses those things. Both leaking fluid and rubber all torn up

SYT_Shadow · 12-13-2016, 01:13 PM

I took mine out at 36k miles and they weren't broken, but they certainly didn't look too hot
That car hadn't been tracked at all

I'm curious how my E92 ones look at 30k miles as that one has seen the track

8600RPM · 12-13-2016, 01:54 PM

In my last e92 they were shot at 30k or so, no track days. Tons of redline wot pills though

Richbot · 12-13-2016, 01:59 PM

I'm curious - DCT or 6MT? Some of the extra trans weight is borne by the motor mounts and the DCT with its faster but just-as-hard shifts is putting more energy in a shorter time on each shift than a manual, and doing it more often because the gearing is closer. I do'nt have symptoms but I'm replacing mine this winter at 90k for the first time, mine's a 6-speed with nowhere near as much tracking but it had 2.5 seasons of pretty heavy autocross rotation on 295/315 Hoosiers, which is a lot of tossing that big weight back and forth at 1+g

SYT_Shadow · 12-13-2016, 02:32 PM

Quote:

Originally Posted by Richbot

I'm curious - DCT or 6MT? Some of the extra trans weight is borne by the motor mounts and the DCT with its faster but just-as-hard shifts is putting more energy in a shorter time on each shift than a manual, and doing it more often because the gearing is closer. I do'nt have symptoms but I'm replacing mine this winter at 90k for the first time, mine's a 6-speed with nowhere near as much tracking but it had 2.5 seasons of pretty heavy autocross rotation on 295/315 Hoosiers, which is a lot of tossing that big weight back and forth at 1+g

The car in the DIY with 36k and worn engine mounts is DCT, not 6MT.

The other one is 6MT, so I'll update accordingly

Richbot · 12-13-2016, 03:32 PM

Just curious it doesn't seem like it should matter THAT much; I'd think just sustained heat from the headers might heat cycle the rubber enough to cause them to fail a bit earlier there's a big difference between 20 minutes of track heat at WOT for 15 minutes of the 20 and even the hardest street driving

8600RPM · 12-13-2016, 03:50 PM

Mine is a dct .

admranger · 12-13-2016, 10:20 PM

The car I did the rod bearings on Sunday was DCT and his mounts were shot (severely cracked but not leaking). Lots of track days.

My 6MT at 35k miles were not that bad. No open cracks but I've done an order of magnitude less track days than previous car.

dparm · 12-13-2016, 11:05 PM

Quote:

Originally Posted by 8600RPM

Why woukdnt they warranty it? 30k of hard driving stresses those things. Both leaking fluid and rubber all torn up

I figured they would try to claim that your racing was considered extreme or excessive.

roastbeef · 12-14-2016, 12:04 AM

Quote:

Originally Posted by dparm

I figured they would try to claim that your racing was considered extreme or excessive.

you seem to keep going back to this. how is the dealer going to know you went to the track?

redpriest · 12-14-2016, 02:25 AM

Think the last time I changed mine was at 110k-ish miles. Am over 150k now, and many more track days since. I should go take a look

roastbeef · 12-14-2016, 02:37 AM

Quote:

Originally Posted by redpriest

Think the last time I changed mine was at 110k-ish miles. Am over 150k now, and many more track days since. I should go take a look

i'm tellin you man, get them vibra-technics! and solidify your rear once you get used to the coilovers...

redpriest · 12-14-2016, 02:39 AM

Quote:

Originally Posted by roastbeef

Quote:

Originally Posted by redpriest

Think the last time I changed mine was at 110k-ish miles. Am over 150k now, and many more track days since. I should go take a look

i'm tellin you man, get them vibra-technics! and solidify your rear once you get used to the coilovers...

I think I may change them out when I do rod bearings.

roastbeef · 12-14-2016, 04:36 AM

Quote:

Originally Posted by redpriest

I think I may change them out when I do rod bearings.

that is probably the way to do it. i was told it is pretty easy to do when doing the rod bearings. i just wasn't ready to do rod bearings yet.

SYT_Shadow · 12-14-2016, 06:13 AM

Quote:

Originally Posted by roastbeef

that is probably the way to do it. i was told it is pretty easy to do when doing the rod bearings. i just wasn't ready to do rod bearings yet.

Yes, it's right in your face when you do rod bearings. It may have added 5 min to the rod bearing procedure

admranger · 12-14-2016, 03:27 PM

Quote:

Originally Posted by SYT_Shadow

Yes, it's right in your face when you do rod bearings. It may have added 5 min to the rod bearing procedure

6.5 minutes for us old guys.

M3 Number 86 · 12-15-2016, 09:02 AM

Mine are fine.

bigjae1976 · 12-17-2016, 11:55 AM

OE rubber engine mounts never last long for track use. I'd consider going with a solid mount. It does add NVH but it's not terrible. Depends on the amount of street driving you do.

JsL · 12-17-2016, 12:01 PM

Without actually looking at the mounts, how do you know they are bad? Sound? Feeling?

I plan to change them when I do my RBs, but just wondering.

12-13-2016, 11:26 AM	#1
8600RPM Lieutenant Colonel 657 Rep 1,749 Posts Drives: e92 m3 Join Date: Oct 2014 Location: AZ iTrader: (0)	Frequency of motor mount change So I'm at 30k in a 2013, did 10 track days this year but prior miles were not aggressive, no standing launches . Mounts are destroyed and getting replaced under warranty. I noticed a clunk in hard acceleration. I run r comps and imagine in general the forces on a car at the track with heavy braking alone really stress the mounts. How often are people replacing them
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12-13-2016, 12:33 PM	#3
gan1hck First Lieutenant 28 Rep 300 Posts Drives: 2012 M3 Join Date: Feb 2012 Location: huntsville, al iTrader: (0)	I have a 2012. Tracking it since 2012....8 or so weekends a year. A little over 40,000 miles...just had my mounts replaced...just after warranty.
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12-13-2016, 01:13 PM	#5
SYT_Shadow ///M Powered for Life 11490 Rep 10,329 Posts Drives: E90M/E92M/M4GTS/M4GT4/X5M Join Date: Sep 2010 Location: Greenwich, CT iTrader: (2)	I took mine out at 36k miles and they weren't broken, but they certainly didn't look too hot That car hadn't been tracked at all I'm curious how my E92 ones look at 30k miles as that one has seen the track
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12-13-2016, 01:54 PM	#6
8600RPM Lieutenant Colonel 657 Rep 1,749 Posts Drives: e92 m3 Join Date: Oct 2014 Location: AZ iTrader: (0)	In my last e92 they were shot at 30k or so, no track days. Tons of redline wot pills though
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12-13-2016, 01:59 PM	#7
Richbot Major General 2760 Rep 5,483 Posts Drives: Jerez Black E90 Join Date: Sep 2007 Location: STL iTrader: (5)	I'm curious - DCT or 6MT? Some of the extra trans weight is borne by the motor mounts and the DCT with its faster but just-as-hard shifts is putting more energy in a shorter time on each shift than a manual, and doing it more often because the gearing is closer. I do'nt have symptoms but I'm replacing mine this winter at 90k for the first time, mine's a 6-speed with nowhere near as much tracking but it had 2.5 seasons of pretty heavy autocross rotation on 295/315 Hoosiers, which is a lot of tossing that big weight back and forth at 1+g __________________ Last edited by Richbot; 12-13-2016 at 02:19 PM..
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12-13-2016, 03:32 PM	#9
Richbot Major General 2760 Rep 5,483 Posts Drives: Jerez Black E90 Join Date: Sep 2007 Location: STL iTrader: (5)	Just curious it doesn't seem like it should matter THAT much; I'd think just sustained heat from the headers might heat cycle the rubber enough to cause them to fail a bit earlier there's a big difference between 20 minutes of track heat at WOT for 15 minutes of the 20 and even the hardest street driving __________________
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12-13-2016, 03:50 PM	#10
8600RPM Lieutenant Colonel 657 Rep 1,749 Posts Drives: e92 m3 Join Date: Oct 2014 Location: AZ iTrader: (0)	Mine is a dct .
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12-13-2016, 10:20 PM	#11
admranger Retired Curmudgeon 2985 Rep 4,047 Posts Drives: ‘19 X3M40i, ‘18 m550i Join Date: May 2011 Location: Las Vegas, NV iTrader: (1)	The car I did the rod bearings on Sunday was DCT and his mounts were shot (severely cracked but not leaking). Lots of track days. My 6MT at 35k miles were not that bad. No open cracks but I've done an order of magnitude less track days than previous car. __________________ '19 X3 M40 Carbon Black/Oyster, '23 Jeep Grand Cherokee L Summit, Past BMWs: '18 M550i, '18 330 GT, '16 X5 40e, '11 E90M3, '06 X5 4.4, '03 330i ZHP, '02 M3, '97 Z3 2.8, '95 M3 (2x), '94 530i (manual), '92 525i (manual), '88 M3, '87 325iS
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12-14-2016, 02:25 AM	#14
redpriest Colonel 2147 Rep 2,527 Posts Drives: 2011 M3/Porsche 992 GT3RS Join Date: Apr 2014 Location: Bay Area, CA iTrader: (0) Garage List 2024 Porsche 911 GT3RS [0.00] 2021 Porsche 718 Sp ... [0.00] 2021 Mazda Miata MX-5 [0.00] 2006 BMW M3 [0.00] 2011 BMW M3 [10.00]	Think the last time I changed mine was at 110k-ish miles. Am over 150k now, and many more track days since. I should go take a look __________________ '06 BMW M3 ZCP 6MT \| JRZ RS Pro + Hyperco 650/750 \| Epic Tune \| Brembo 355mm BBK \| too many to list '11 BMW M3 ZCP DCT \| Akra Evolution \| Eventuri intake \| MCS 3-way \| 4.6L Carbahn S65 \| Zebulon Aero \| AP Racing Radi-CAL BBK by Essex \| 305/645-18 Pirelli DHB Porsche 992 GT3, 991.2 GT3RS, 718 Spyder instagram.com/titomanlio
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12-15-2016, 09:02 AM	#20
M3 Number 86 Major General 3221 Rep 6,218 Posts Drives: black m3 Join Date: Mar 2015 Location: pasadena iTrader: (1)	Mine are fine. __________________ dadmobile IG: @M3number86 youtube: track vids
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12-17-2016, 11:55 AM	#21
bigjae1976 Major General 1571 Rep 8,076 Posts Drives: 11 E90 M3 Individual Join Date: Mar 2006 Location: Houston, TX iTrader: (22) Garage List 2004 BMW M3 [4.50] 2011 BMW E90 M3 [5.25] 2013 BMW 328i [5.00]	OE rubber engine mounts never last long for track use. I'd consider going with a solid mount. It does add NVH but it's not terrible. Depends on the amount of street driving you do. __________________ 2018 F30 320iX Melbourne Red 2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue
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12-17-2016, 12:01 PM	#22
JsL Major 448 Rep 1,263 Posts Drives: 2011 AW M3 ZCP Join Date: Dec 2013 Location: SF Bay Area iTrader: (2)	Without actually looking at the mounts, how do you know they are bad? Sound? Feeling? I plan to change them when I do my RBs, but just wondering.
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