Aftermarket exhausts causing black soot - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

tahdizzle · 05-20-2014, 05:09 PM

People have answered your question.

If you aren't throwing a CEL and you don't hear/notice any strange behavior in your car, then I wouldn't worry.

husker741 · 05-20-2014, 05:12 PM

Quote:

Originally Posted by J_kennington

that's ALOT of black making it through in my eyes.

eighty666 · 05-20-2014, 05:24 PM

Go wipe your finger across any exhaust pipe on any car parked on the street. your finger will be black. thats just how it goes

tahdizzle · 05-20-2014, 05:24 PM

Quote:

Originally Posted by eighty666

Go wipe your finger across any exhaust pipe on any car parked on the street. your finger will be black. thats just how it goes

Pervert

eighty666 · 05-20-2014, 05:28 PM

Quote:

Originally Posted by tahdizzle

Pervert

Only if you fist it

mid_life_crisis · 05-20-2014, 05:34 PM

If it got that dark that fast, you should monitor your AFR just as a check. You are probably running pig rich. I have 10,000 miles on my car and not a spec of soot that you can see without getting down behind the car to check specifically for it.
My old Speed3, now that had a black exhaust tip, but that was because
factory turbo = pig rich mixture.

neutron256 · 05-20-2014, 05:51 PM

It's likely just the way the exhaust tips are shaped. My Perrin exhaust makes even a tiny bit of "soot" very obvious on the large smooth surface compared to the stock tips which have lots of edges to catch and hide it.

Tainen · 05-20-2014, 06:01 PM

As Mid_Life_Crisis stated, AFR plays a role. Additionally, be aware that the stock tune is pig-rich, so in stock form this is pretty common. A tune actually would reduce the soot levels some

Neutron256 also makes a valid point too. Tip shape might have impact.

mav1178 · 05-20-2014, 06:13 PM

Quote:

Originally Posted by J_kennington

so I put a nameless axle back on my car with 4" tips. After ~week of driving the tips are covered in black soot.

My two cents:

I put JDM GT86 tips on my stock exhaust. Black "soot" more visible without change in driving style.

My conclusion: when you mod the car, you notice these small things more. I went back and looked at my stock tips, and lo and behold... they're pretty damn dark too!

I just never noticed with a stock exhaust because I wasn't bothering to look.

-alex

2pt5RS · 05-21-2014, 02:07 PM

steve99 · 05-21-2014, 10:40 PM

Quote:

Originally Posted by J_kennington

Pretty sure you all took it way out of context. I'm not saying a motor should never create any. I'm saying I don't believe a stock motor with stock exhaust should create enough to turn 4" tips completely black in a weeks time. If I had no mufflers, no resonators, and no cats. I could understand a good bit being produced out the tip. But with 2 cats, resonators and 2 mufflers, that's ALOT of black making it through in my eyes.

It happens on stock car as well

Depends on yur driving and if its all city stuff you tend to get more soot , lot of freeway driving and it will be less

As others have said tip design can make a difference larger tips run cooler and accumulate more soot you can see

Fuel also makes a difference 10 percent ethanol fuels produce less soot nad emmissions as the ethanol aids combustion.

Run E85 with appropiate tune and there will be no soot at all perfectly clean :-)

These cars being sports cars are generally tuned a bit richer than your family ecno box so you will often see more soot on sports cars

05-20-2014, 05:34 PM	#20
mid_life_crisis Senior Member Join Date: May 2013 Drives: FR-S 10 #103 AT Location: NC Posts: 1,519 Thanks: 101 Thanked 599 Times in 347 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	If it got that dark that fast, you should monitor your AFR just as a check. You are probably running pig rich. I have 10,000 miles on my car and not a spec of soot that you can see without getting down behind the car to check specifically for it. My old Speed3, now that had a black exhaust tip, but that was because factory turbo = pig rich mixture. __________________ Necessity may be the mother of Invention but Desperation is quite often the father. “Sex is like Bridge. If you don't have a good partner, you'd better have a good hand.” - Mae West Papa said, "son there's a lot of evil temptations out there. Best to try 'em all so you know which ones to avoid."

05-20-2014, 05:51 PM	#21
neutron256 Senior Member Join Date: Jan 2012 Drives: '13 GBS Subaru BRZ Location: Minneapolis, MN Posts: 2,030 Thanks: 680 Thanked 664 Times in 382 Posts Mentioned: 26 Post(s) Tagged: 1 Thread(s)	It's likely just the way the exhaust tips are shaped. My Perrin exhaust makes even a tiny bit of "soot" very obvious on the large smooth surface compared to the stock tips which have lots of edges to catch and hide it. __________________ -Fortes fortuna adiuvat (Fortune favors the bold)

05-20-2014, 06:01 PM	#22
Tainen Senior Member Join Date: Nov 2011 Drives: First SWP BRZ-L Location: Washington Posts: 809 Thanks: 154 Thanked 350 Times in 174 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	As Mid_Life_Crisis stated, AFR plays a role. Additionally, be aware that the stock tune is pig-rich, so in stock form this is pretty common. A tune actually would reduce the soot levels some Neutron256 also makes a valid point too. Tip shape might have impact. __________________ First white BRZ in the country Limited SWP BRZ, 35% tint, clear bra, Nameless Performance downpipe, axelback, headers

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05-20-2014, 05:24 PM	#17
eighty666 Banned Join Date: May 2014 Drives: BRZ Location: Knew York Posts: 88 Thanks: 17 Thanked 18 Times in 15 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Go wipe your finger across any exhaust pipe on any car parked on the street. your finger will be black. thats just how it goes

05-21-2014, 02:07 PM	#24
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