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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 05-30-2011, 10:50 AM
mbroadway mbroadway is offline
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Exhaust soot.

The first few times I drove my new 335i, I noticed a lot of black soot on the right exhaust. It's now been sixteen days since picking it up, and the odometer is around 450 miles. The funny thing is, the last two times I've driven the car there was no black soot on the pipe when I got home. I'm wondering if this is something that usually occurs only when the engine is brand new and if it decreases with time and miles.

I'm not unhappy about it. Now, if I could ever get a chance to wash it and spray the wheels with that Armour All Wheel Protectant, that would help with the brake dust issue. If it's not one thing, it's another. Life is hard when you're a perfectionist.
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  #2  
Old 05-30-2011, 11:13 AM
mbroadway mbroadway is offline
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Anyone? Anyone? Bueller?
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  #3  
Old 05-30-2011, 11:20 AM
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Orient330iNYC Orient330iNYC is offline
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normal and doesnt decrease. there's more soot on the right pipe because the exhaust has a valve in the left pipe thats closed at low rpm to reduce noise.
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Old 05-30-2011, 11:21 AM
mbroadway mbroadway is offline
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Thanks Orient.

I'm still wondering why the black residue has decreased so much the past couple of days.
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  #5  
Old 05-30-2011, 02:41 PM
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Zeichen311 Zeichen311 is offline
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Quote:
Originally Posted by mbroadway View Post
I'm still wondering why the black residue has decreased so much the past couple of days.
It's a bit variable depending on how you drove recently: Short trip, highway cruise, how much part throttle vs. full throttle, etc., etc.

Don't worry, it'll be back.
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Last edited by Zeichen311; 05-30-2011 at 02:44 PM.
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Old 05-30-2011, 02:53 PM
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GarySL GarySL is offline
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  #7  
Old 05-31-2011, 06:15 AM
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Eights-n-Aces Eights-n-Aces is offline
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Quote:
Originally Posted by Orient330iNYC View Post
normal and doesnt decrease. there's more soot on the right pipe because the exhaust has a valve in the left pipe thats closed at low rpm to reduce noise.
I think this is partially correct. I believe the valve directs the exhaust to the right tail pipe until the catalytic converters warm up. Once warm, the exhaust is directed to both pipes regardless of rpm.
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Old 05-31-2011, 08:20 AM
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Orient330iNYC Orient330iNYC is offline
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Originally Posted by Eights-n-Aces View Post
I think this is partially correct. I believe the valve directs the exhaust to the right tail pipe until the catalytic converters warm up. Once warm, the exhaust is directed to both pipes regardless of rpm.
nope, has nothing to do with the catalytic converters-- my performance exhaust has no valve. if it has any effect on emissions, bmw would not be able to sell it without the flap. it will actively close to reduce noise.
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  #9  
Old 05-31-2011, 12:16 PM
Thumperx Thumperx is offline
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Main reason:

"In order to enhance the exhaust note emanating from the tailpipe(s), BMW has arranged a thermistor switched, electrically controlled, vacuum operated butterfly valve to close off the tailpipe on the driver's side while the engine warms up. This results in a more pleasant exhaust note when you are first pulling out of your neighborhood." Gig103 02-05-2008, 10:19 AM
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Old 05-31-2011, 12:20 PM
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Originally Posted by Zeichen311 View Post
It's a bit variable depending on how you drove recently: Short trip, highway cruise, how much part throttle vs. full throttle, etc., etc.

Don't worry, it'll be back.
+1

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  #11  
Old 09-25-2012, 01:56 PM
Makbeam Makbeam is offline
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I notice it on my new 528xi drivers side tail pipe today for the first time. Must say was a bit worried, its been driven 650 miles. if it is a rich fuel mix, why should new cars have such inefficient setting?
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  #12  
Old 09-25-2012, 02:01 PM
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andrew b andrew b is offline
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Quote:
Originally Posted by Thumperx View Post
Main reason:

"In order to enhance the exhaust note emanating from the tailpipe(s), BMW has arranged a thermistor switched, electrically controlled, vacuum operated butterfly valve to close off the tailpipe on the driver's side while the engine warms up. This results in a more pleasant exhaust note when you are first pulling out of your neighborhood." Gig103 02-05-2008, 10:19 AM
This, exactly. Does not related to RPM. Once warm, both stay open.
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  #13  
Old 09-25-2012, 02:19 PM
The X Men The X Men is offline
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Quote:
Originally Posted by mbroadway View Post
The first few times I drove my new 335i, I noticed a lot of black soot on the right exhaust. It's now been sixteen days since picking it up, and the odometer is around 450 miles. The funny thing is, the last two times I've driven the car there was no black soot on the pipe when I got home. I'm wondering if this is something that usually occurs only when the engine is brand new and if it decreases with time and miles.
It might be due to the fact that your piston rings are still seating, hance the need for a good break in period.
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  #14  
Old 09-25-2012, 06:15 PM
mbroadway mbroadway is offline
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I'm not sure about the cause, but after 6,000 miles, I traded the car in on a 2012 Mustang GT with 412hp and a 6-speed manual. I freaking LOVE this car. Not saying anything negative about BMW, but I really like the Mustang a lot better. I take every opportunity to drive it. Fast. For some reason, both of my tail pipes are clean as a whistle inside, even after 5,500 miles. So, my problem has been solved.
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Old 09-25-2012, 06:22 PM
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pointandgo pointandgo is offline
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Originally Posted by mbroadway View Post
I'm not sure about the cause, but after 6,000 miles, I traded the car in on a 2012 Mustang GT with 412hp and a 6-speed manual. I freaking LOVE this car. Not saying anything negative about BMW, but I really like the Mustang a lot better. I take every opportunity to drive it. Fast. For some reason, both of my tail pipes are clean as a whistle inside, even after 5,500 miles. So, my problem has been solved.
Do you need a link to the Mustang forum? I took a peek...it's overrun with chewing tobacco and beef jerky ads...but you've made your bed and have to sleep in it.
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Last edited by pointandgo; 09-25-2012 at 06:27 PM.
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  #16  
Old 09-25-2012, 06:47 PM
mbroadway mbroadway is offline
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Thanks for the offer, but I already have a link to several Mustang forums. Funny, I didn't see any beef jerky or chewing tobacco ads. LOL.
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