excessive carbon exhaust in back of car? (pics)

jlcf22 · 02-10-2014, 07:22 PM

Been dealing with this for about 5 months now I wash my car then the next two days my back bumper and trunk is full of black carbon coming from the exhaust. Could it be leaky injectors causing this? I also have catless downpipes and muffler delete and still have my oem secondaries in place. It looks worst in person, Anyone else having this same issue?

Infamy · 02-10-2014, 09:41 PM

Yes same issue on my car. Catless dwn pipes stock exhaust.

jlcf22 · 02-10-2014, 11:21 PM

Quote:

Originally Posted by Infamy

Yes same issue on my car. Catless dwn pipes stock exhaust.

yup it sucks trying to keep bumper and trunk clean

Hokie_BMW · 02-10-2014, 11:27 PM

As soon as I got catless Dp's I have more carbon buildup on my tips that is tough to get off if I let it sit to long. My car is black though so I don't see it on the paint.

E90_831 · 02-10-2014, 11:29 PM

Catless downpipes will do that.

jlcf22 · 02-11-2014, 12:29 AM

Could it be that my secondaries are failing? I've notice that the exhaust tone changed

drjekl · 02-11-2014, 04:43 AM

Yeah its surprising how much gunk comes out of the pipes at times, which makes you wonder if the cats were collecting all this crap imagine how choked up they must get hence a reduction in power.

Pretty sure this is normal dude, but the weird thing is i only noticed it when i initially installed my BMW PE, with the oem mufflers and catless pipes it was fine. Also sometime its worse then others

olliej · 02-11-2014, 10:38 AM

I just installed hi flow cats and I still have the same issue....

Bleach8484 · 02-11-2014, 11:30 AM

I would Imagine it has a little to do with the carbon build up in the cylinder head too?

I have a full stock DP and mufflers, and plenty of crud accumulates on my bumper.

Jeff@TopGearSolutions · 02-11-2014, 11:46 AM

Somewhat normal depending on how many miles were driven to get to that state?

How long does it take for that much build up?

SfValley335i · 02-11-2014, 01:11 PM

i have a similar setup, catless dp, catted mids and aftermarket muffler. I get the same buildup after about a week of driving. I got 40k miles on my car...

shadow191 · 02-11-2014, 01:27 PM

It's the catless DP's, I had the same issue. But even with OEM DP's, you'll get the soot on the bumper, it just takes longer. I put the OEM's back on the pass emissions and even with the stock cats, the bumper still gets dirty, just more slowly. Probably because of the tune.

jlcf22 · 02-11-2014, 02:54 PM

Quote:

Originally Posted by Jeff@TopGearSolutions

Somewhat normal depending on how many miles were driven to get to that state?

How long does it take for that much build up?

I got 63xxx miles and it started about 5 months ago when I got my protune also been having long starting cranks

MDORPHN · 02-11-2014, 03:10 PM

Quote:

Originally Posted by jlcf22

I got 63xxx miles and it started about 5 months ago when I got my protune also been having long starting cranks

Sounds like two things going on. Your tune may be rich and that would cause additional soot. The long cranking is often an early sign of a failing high pressure fuel pump.

Neil

blacknbean · 02-11-2014, 05:55 PM

my car is stock and I have the same issue lol

M3_Dylan · 02-12-2014, 04:00 AM

Same issue with FBO and e85 tune putting black shit all over my garage wall on start ups

jlcf22 · 02-12-2014, 08:01 AM

Dang I guess it's a common thing I'm not alone lol

Bme30 · 02-12-2014, 08:22 PM

I'm Fbo with 50k miles have castless dps and I don't have that issue??

02-10-2014, 07:22 PM	#1
jlcf22 Lieutenant 100 Rep 502 Posts Drives: 335i09 Join Date: Jan 2012 Location: bakersfield CA iTrader: (0)	excessive carbon exhaust in back of car? (pics) Been dealing with this for about 5 months now I wash my car then the next two days my back bumper and trunk is full of black carbon coming from the exhaust. Could it be leaky injectors causing this? I also have catless downpipes and muffler delete and still have my oem secondaries in place. It looks worst in person, Anyone else having this same issue? Attached Images
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02-10-2014, 09:41 PM	#2
Infamy underground 63 Rep 331 Posts Drives: alpine white 335 E92 Join Date: Aug 2013 Location: central Jersey iTrader: (1) Garage List 2010 BMW 335i [9.66]	Yes same issue on my car. Catless dwn pipes stock exhaust. __________________
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02-10-2014, 11:27 PM	#4
Hokie_BMW Captain 59 Rep 661 Posts Drives: 2009 335i Sedan Join Date: Apr 2013 Location: NC iTrader: (0)	As soon as I got catless Dp's I have more carbon buildup on my tips that is tough to get off if I let it sit to long. My car is black though so I don't see it on the paint.
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02-10-2014, 11:29 PM	#5
E90_831 Lieutenant 23 Rep 448 Posts Drives: 335i Msport Join Date: Jul 2013 Location: Monterey, Ca iTrader: (4) Garage List 2014 GMC Sierra Denali [0.00] 2006 Lancer Evo Rs [0.00]	Catless downpipes will do that.
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02-11-2014, 12:29 AM	#6
jlcf22 Lieutenant 100 Rep 502 Posts Drives: 335i09 Join Date: Jan 2012 Location: bakersfield CA iTrader: (0)	Could it be that my secondaries are failing? I've notice that the exhaust tone changed
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02-11-2014, 04:43 AM	#7
drjekl Captain 35 Rep 809 Posts Drives: E92 335i Join Date: Jan 2013 Location: Oz iTrader: (0)	Yeah its surprising how much gunk comes out of the pipes at times, which makes you wonder if the cats were collecting all this crap imagine how choked up they must get hence a reduction in power. Pretty sure this is normal dude, but the weird thing is i only noticed it when i initially installed my BMW PE, with the oem mufflers and catless pipes it was fine. Also sometime its worse then others
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02-11-2014, 10:38 AM	#8
olliej Private First Class 8 Rep 120 Posts Drives: 2008 335XI Join Date: Nov 2011 Location: NSB, FL iTrader: (0)	I just installed hi flow cats and I still have the same issue.... __________________ afe cold air intake ets charge pipe with tial blow off valve ets 6" intercooler,ets catless downpipes,VSRF 3.5 exhaust,bmw jb4 programmer.bilstein hd shocks with eibach lowering springs,blacked out tail lights,carbon fiber headlight eyebrows/spoiler and all emblems,carbon fiber grilles and hood lades
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02-11-2014, 11:30 AM	#9
Bleach8484 Private First Class 9 Rep 115 Posts Drives: 335i Join Date: Sep 2013 Location: Atlanta iTrader: (0)	I would Imagine it has a little to do with the carbon build up in the cylinder head too? I have a full stock DP and mufflers, and plenty of crud accumulates on my bumper.
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02-11-2014, 11:46 AM	#10
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Somewhat normal depending on how many miles were driven to get to that state? How long does it take for that much build up?
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02-11-2014, 01:11 PM	#11
SfValley335i Colonel 164 Rep 2,409 Posts Drives: Current:135i Sold:335i sedan Join Date: Mar 2007 Location: City of Angels iTrader: (8)	i have a similar setup, catless dp, catted mids and aftermarket muffler. I get the same buildup after about a week of driving. I got 40k miles on my car...
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02-11-2014, 01:27 PM	#12
shadow191 Lieutenant Colonel 181 Rep 1,681 Posts Drives: 2017 Volvo XC90 R-Design Join Date: Dec 2012 Location: GA iTrader: (3)	It's the catless DP's, I had the same issue. But even with OEM DP's, you'll get the soot on the bumper, it just takes longer. I put the OEM's back on the pass emissions and even with the stock cats, the bumper still gets dirty, just more slowly. Probably because of the tune.
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02-11-2014, 05:55 PM	#15
blacknbean Major 14 Rep 1,044 Posts Drives: e92 335i 6MT Join Date: Jul 2007 Location: LA iTrader: (2)	my car is stock and I have the same issue lol
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02-12-2014, 04:00 AM	#16
M3_Dylan Lieutenant 32 Rep 520 Posts Drives: 2008 BMW M3 Join Date: Sep 2011 Location: Orlando iTrader: (5)	Same issue with FBO and e85 tune putting black shit all over my garage wall on start ups __________________ KW V3's / AA Stage 2 Supercharger / Catless Mid-pipes / AA Mufflers / Apex Arc-8's / PFC 09's
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02-12-2014, 08:01 AM	#17
jlcf22 Lieutenant 100 Rep 502 Posts Drives: 335i09 Join Date: Jan 2012 Location: bakersfield CA iTrader: (0)	Dang I guess it's a common thing I'm not alone lol
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02-12-2014, 08:22 PM	#18
Bme30 Major 88 Rep 1,039 Posts Drives: 335i coupe Join Date: May 2010 Location: 'Merika' iTrader: (2) Garage List 2007 335i [0.00]	I'm Fbo with 50k miles have castless dps and I don't have that issue??
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