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F30 / F31 / F32 / F33 (2012 - current)
The sixth generation 3 series, chassis code F30. 2013 model year 328i and 335i sedans now in production. Read the F30 frequently asked question thread for all your basic question and dive into all the details in the ultimate F30 information thread.

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  #1  
Old 08-12-2012, 11:10 AM
kevins950 kevins950 is offline
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MY 2013 335i Exhaust Carbon Build Up

Now that I've got 700 km on the odometer, I've noticed a difference in the color of the two exhaust tips. The drivers side inside exhaust is clean with no carbon build up. You can actually see the clean metal inside the exhaust tip. The passenger side inside exhaust is coated and layered with obvious black carbon build up. Is anyone experiencing one sided carbon build up on the exhaust?
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  #2  
Old 08-12-2012, 12:05 PM
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Orient330iNYC Orient330iNYC is offline
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Quote:
Originally Posted by kevins950 View Post
Now that I've got 700 km on the odometer, I've noticed a difference in the color of the two exhaust tips. The drivers side inside exhaust is clean with no carbon build up. You can actually see the clean metal inside the exhaust tip. The passenger side inside exhaust is coated and layered with obvious black carbon build up. Is anyone experiencing one sided carbon build up on the exhaust?
normal. bmw has a flapper valve in one exhaust tip to control noise and prevent droning at low rpm. the other is always open. thats why one tip is "cleaner".
this has been present on bmws since the E46.
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  #3  
Old 08-12-2012, 12:07 PM
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its the part near #7 and 8. part #7 is the actuator the opens and closes it.
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  #4  
Old 08-12-2012, 02:01 PM
vern vern is offline
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Quote:
Originally Posted by Orient330iNYC View Post
normal. bmw has a flapper valve in one exhaust tip to control noise and prevent droning at low rpm. the other is always open. thats why one tip is "cleaner".
this has been present on bmws since the E46.
I know what you are saying is true, thats what the dealer told me when I had it on my 2010 535i but how do you explain not having it on my 2005 530i or do I have it on my 2012 F30 335i Sport with 5,500 + miles on it and all cars have the flapper valve as a matter of fact my 2006 X3 with over 55,000 miles has the flapper and no build up.
cheers
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Last edited by vern; 08-12-2012 at 02:02 PM.
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  #5  
Old 08-12-2012, 03:11 PM
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Quote:
Originally Posted by vern View Post
I know what you are saying is true, thats what the dealer told me when I had it on my 2010 535i but how do you explain not having it on my 2005 530i or do I have it on my 2012 F30 335i Sport with 5,500 + miles on it and all cars have the flapper valve as a matter of fact my 2006 X3 with over 55,000 miles has the flapper and no build up.
cheers
vern
Typically it is much more evident on cars that have split dual exhaust pipes. I don't know why you don't have it on your F30 335i. Just lucky.
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  #6  
Old 08-12-2012, 04:35 PM
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Borla 21461 Exhaust Cleaner and Polish very good stuff very expensive for 8oz. Also one of the green and yellow sponges, and some random exhaust/metal cleaner and a strong arm will do a good job.. But the Borla would clean it up real nice
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  #7  
Old 08-12-2012, 05:13 PM
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Quote:
Originally Posted by SuperTerp View Post
Borla 21461 Exhaust Cleaner and Polish very good stuff very expensive for 8oz. Also one of the green and yellow sponges, and some random exhaust/metal cleaner and a strong arm will do a good job.. But the Borla would clean it up real nice
We are talking about the inside of the exhaust not the outside.
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vern
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  #8  
Old 08-12-2012, 05:35 PM
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Quote:
Originally Posted by vern View Post
We are talking about the inside of the exhaust not the outside.
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I assumed since he was so concerned with the buildup he'd want something to get rid of it.
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  #9  
Old 08-12-2012, 05:42 PM
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There is no harm in cleaning the inside if you choose to do so. I am insufficiently anal to pay much attention to the outside of the pipes, much less the inside (cheers for black chrome) but I know those that polish both inside and out.
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Old 08-12-2012, 06:57 PM
wchast wchast is offline
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Quote:
Originally Posted by vern View Post
I know what you are saying is true, thats what the dealer told me when I had it on my 2010 535i but how do you explain not having it on my 2005 530i or do I have it on my 2012 F30 335i Sport with 5,500 + miles on it and all cars have the flapper valve as a matter of fact my 2006 X3 with over 55,000 miles has the flapper and no build up.
cheers
vern
Vern:
Start your car up( cold engine) and immediately walk to the rear of your car and observe the right rear exhaust pipe. Place your hand in front of the left exhaust pipe. You should not feel any exhaust coming out of the left pipe. Within 15 -20 seconds the actuator will open the left exhaust pipe and you will see the pipe starting to heat up very quickly. Just an observation I noticed on my F-30 335i about a week ago. Initially, the right exhaust has a very deep tone until the actuator opens the left exhaust pipe.
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  #11  
Old 08-13-2012, 10:26 AM
kevins950 kevins950 is offline
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Quote:
Originally Posted by Orient330iNYC View Post
its the part near #7 and 8. part #7 is the actuator the opens and closes it.
Appreciate the diagram. Helps to know and understand how it works.
Quote:
Originally Posted by vern View Post
I know what you are saying is true, thats what the dealer told me when I had it on my 2010 535i but how do you explain not having it on my 2005 530i or do I have it on my 2012 F30 335i Sport with 5,500 + miles on it and all cars have the flapper valve as a matter of fact my 2006 X3 with over 55,000 miles has the flapper and no build up.
cheers
vern
Thanks for sharing your experience.
Quote:
Originally Posted by SuperTerp View Post
I assumed since he was so concerned with the buildup he'd want something to get rid of it.
Yes. Eventually I will clean it. But I'm bothered by the amount of carbon build up.
Quote:
Originally Posted by wchast View Post
Vern:
Start your car up( cold engine) and immediately walk to the rear of your car and observe the right rear exhaust pipe. Place your hand in front of the left exhaust pipe. You should not feel any exhaust coming out of the left pipe. Within 15 -20 seconds the actuator will open the left exhaust pipe and you will see the pipe starting to heat up very quickly. Just an observation I noticed on my F-30 335i about a week ago. Initially, the right exhaust has a very deep tone until the actuator opens the left exhaust pipe.
What is the mileage and are you having any carbon build up?

I understand that some carbon build up is normal. But I only have about 800 km and the carbon build up is thickly layered, mucky/caked, and seeping or oozing out of one side of the tail pipe. You can see the surface metal on the inside of the other pipe. I would think that this is somewhat indicative or related to the amount of oil burning from the cylinders.

Maybe I'll clean out the inside of the caked tail pipe and observe it over time to see if it continues to get caked with carbon. I dunno.
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  #12  
Old 08-13-2012, 12:13 PM
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Orient330iNYC Orient330iNYC is offline
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Quote:
Originally Posted by kevins950 View Post
Appreciate the diagram. Helps to know and understand how it works.

Thanks for sharing your experience.

Yes. Eventually I will clean it. But I'm bothered by the amount of carbon build up.

What is the mileage and are you having any carbon build up?

I understand that some carbon build up is normal. But I only have about 800 km and the carbon build up is thickly layered, mucky/caked, and seeping or oozing out of one side of the tail pipe. You can see the surface metal on the inside of the other pipe. I would think that this is somewhat indicative or related to the amount of oil burning from the cylinders.

Maybe I'll clean out the inside of the caked tail pipe and observe it over time to see if it continues to get caked with carbon. I dunno.
are you city driving? or highway? if its city, you're probably getting a heavier deposit from the initial moisture coming off the engine giving the soot something to stick to.
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Last edited by Orient330iNYC; 08-13-2012 at 12:18 PM.
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  #13  
Old 08-13-2012, 02:50 PM
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Quote:
Originally Posted by tturedraider View Post
Typically it is much more evident on cars that have split dual exhaust pipes. I don't know why you don't have it on your F30 335i. Just lucky.
The 2010 535 i doesn't have" split dual exhaust pipes".
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  #14  
Old 08-13-2012, 08:21 PM
kevins950 kevins950 is offline
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Originally Posted by Orient330iNYC View Post
are you city driving? or highway? if its city, you're probably getting a heavier deposit from the initial moisture coming off the engine giving the soot something to stick to.
I'm doing mostly city driving between work and home.
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Old 12-20-2012, 03:02 PM
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mine is black like that also.
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  #16  
Old 12-20-2012, 03:33 PM
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Quote:
Originally Posted by Orient330iNYC View Post
normal. bmw has a flapper valve in one exhaust tip to control noise and prevent droning at low rpm. the other is always open. thats why one tip is "cleaner".
this has been present on bmws since the E46.
Maybe on some BMWs, but my 2006 Z4 M Roadster (with an E46 M3 S54 engine and dual mufflers) doesn't have a flapper valve. I installed a Strömung exhaust last month and no flapper valves to be found!

(Sorry, kind of late on that reply!)
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Old 12-20-2012, 03:41 PM
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I think the flap closing has more to do with warming up the catalytic converter. It covers one of the exhaust tips to increase cat temperature.

And vern, your F30 335i sport has black tips so it probably isn't as noticeable. My M Sport gets super black tips, even darker than the OPs. I just leave it alone, it doesn't hurt anyone. I do have to maintain the bumper more often to clean up residue.
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  #18  
Old 12-20-2012, 04:08 PM
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Originally Posted by johnofcross View Post
I think the flap closing has more to do with warming up the catalytic converter. It covers one of the exhaust tips to increase cat temperature.

And vern, your F30 335i sport has black tips so it probably isn't as noticeable. My M Sport gets super black tips, even darker than the OPs. I just leave it alone, it doesn't hurt anyone. I do have to maintain the bumper more often to clean up residue.
Yeah my 335i sport is super black also. I just removed the spring and did the golf-tee mod earlier today. Wiped both exhaust tips. Going to see how they dirty up now.
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Old 12-20-2012, 06:04 PM
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Originally Posted by johnofcross View Post
I think the flap closing has more to do with warming up the catalytic converter. It covers one of the exhaust tips to increase cat temperature.

And vern, your F30 335i sport has black tips so it probably isn't as noticeable. My M Sport gets super black tips, even darker than the OPs. I just leave it alone, it doesn't hurt anyone. I do have to maintain the bumper more often to clean up residue.
its noise reduction as a consequence of heating up the cat. on cold start, the intake/exhaust valve (in the engine) opening is programmed to heat up the cat quickly. i forget, but i believe that the exhaust valves are kept open longer to dump more hot gas into the cat quickly. this can be loud. my car (which has no flapper valve, bmw performance exhaust) is loud enough to set off car alarms in my garage on a cold start, the noise drops off as soon as the cat gets lit off. thats about the same time as the flap would open. the flap itself does nothing for emissions.
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Old 12-20-2012, 07:55 PM
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Originally Posted by johnofcross View Post
I think the flap closing has more to do with warming up the catalytic converter. It covers one of the exhaust tips to increase cat temperature.

And vern, your F30 335i sport has black tips so it probably isn't as noticeable. My M Sport gets super black tips, even darker than the OPs. I just leave it alone, it doesn't hurt anyone. I do have to maintain the bumper more often to clean up residue.
Bingo.
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