Soot in Exhaust...Normal? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

MasonL1997 · 11-22-2015, 10:16 PM

Hi everyone,

Ive had the car for just over 3 months and am the second owner with the car currently having 31 thousand kilometers. Now, when ever i go WOT and get out of the car after driving, i look at the exhaust and notice a small amount of black soot in the exhaust. Is this normal? Then if i dont clean it, after a fair bit of spirited driving i find the exhaust having quite a lot of soot inside it. Is this normal?

(Refer to pictures, one is still dirty, the other i have cleaned)

Thanks,
Mason

Impureclient · 11-22-2015, 10:26 PM

Unburnt fuel from running rich. Normal.

BRZ'13 · 11-22-2015, 10:27 PM

Seems normal (i hope). All the cars iv owned/scene have jt. Just make sure its not oil. I dont even bother cleaning mine

KR-S · 11-22-2015, 10:45 PM

It's totaled.

MasonL1997 · 11-23-2015, 12:01 AM

Quote:

Originally Posted by Impureclient

Unburnt fuel from running rich. Normal.

running rich....will it cause injector problems down the track?

MasonL1997 · 11-23-2015, 12:02 AM

Quote:

Originally Posted by KR-S 86

It's totaled.

Damn it! I too fit in with every second post on this forum regarding a totaled car

FRSBRZGT86FAN · 11-23-2015, 12:10 AM

Quote:

Originally Posted by MasonL1997

running rich....will it cause injector problems down the track?

No, the black "soot" you're talking about is just the carbon buildup due the afr being rich. All cars are set up to run a little rich in stock form - rich is "safe" from the manufacturer perspective. It will not cause injector problems every car has this buildup on the tips it's just some of them you can't see it. Also the FA20 uses Direct injection and port fuel injection. i.e. it has 8 injectors. Port injection still works much better for low rpm and idling for emissions & power. If anything were to be effected by soot it would only be the 4 injectors within the cylinders. At WOT at some points I'm pretty sure it uses both and you'll get that carbon on the tips the more frequently when that happens. Just keep cleaning it every month or so, so that it doesn't get caked on.

MasonL1997 · 11-23-2015, 12:25 AM

Quote:

Originally Posted by FRSBRZGT86FAN

No, the black "soot" you're talking about is just the carbon buildup due the afr being rich. All cars are set up to run a little rich in stock form - rich is "safe" from the manufacturer perspective. It will not cause injector problems every car has this buildup on the tips it's just some of them you can't see it. Also the FA20 uses Direct injection and port fuel injection. i.e. it has 8 injectors. Port injection still works much better for low rpm and idling for emissions & power. At WOT at some points I'm pretty sure it uses both and you'll get that carbon on the tips the more frequently when that happens. Just keep cleaning it every month or so, so that it doesn't get caked on.

Awesome! Thank you heaps!

aegisdrgn · 11-23-2015, 12:31 AM

If you're curious to learn more about the port / direct injection modes...you've come to the right forum!

http://www.ft86club.com/forums/showthread.php?t=50827

http://www.ft86club.com/forums/showthread.php?t=3172

Hotrodheart · 11-23-2015, 12:34 AM

Braces · 11-23-2015, 07:26 AM

Is that the same black soot on the floor?

stevesnj · 11-23-2015, 10:10 AM

extrashaky · 11-23-2015, 10:18 AM

You can monitor your AFR with Torque to see if you're running the right mixture. It usually runs about 14.5 to 1.

jawn · 11-23-2015, 10:54 AM

Quote:

Originally Posted by extrashaky

You can monitor your AFR with Torque to see if you're running the right mixture. It usually runs about 14.5 to 1.

Not under load.

11-23-2015, 10:10 AM	#12
stevesnj Senior Member Join Date: May 2013 Drives: 2016 FR-S Oceanic Blue Location: Southern NJ Posts: 2,958 Thanks: 2,158 Thanked 1,601 Times in 923 Posts Mentioned: 30 Post(s) Tagged: 2 Thread(s)	__________________ My 2016 Build thread TRD Exhaust with custom quad tips, TRD Lowering Springs,TRD Quick shifter,LED;DRL, Projectors, and turn signals. Re-badge, 86 Nanny, WinmaxW2 Pads, K&N Drop In, Antenna delete

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
TRD Exhaust/Intake Installed - Super loud - Problem or Normal??	Chase86	Engine, Exhaust, Transmission	21	02-04-2019 01:02 AM
Undercarriage (exhaust piping) rust, normal?	gonzalj1	BRZ First-Gen (2012+) -- General Topics	18	09-21-2015 01:22 AM
IS IT NORMAL	WGMGR	Scion FR-S / Toyota 86 GT86 General Forum	40	12-08-2014 05:19 PM
Aftermarket exhausts causing black soot	J_kennington	Engine, Exhaust, Transmission	25	05-21-2014 09:40 PM
Water with black soot in exhaust	KamalT	Engine, Exhaust, Transmission	17	01-08-2013 09:28 AM

11-22-2015, 10:26 PM	#2
Impureclient Banned Join Date: May 2015 Drives: 2015 FR-S Location: NPR, Florida Posts: 2,404 Thanks: 1,802 Thanked 2,903 Times in 1,282 Posts Mentioned: 25 Post(s) Tagged: 2 Thread(s)	Unburnt fuel from running rich. Normal.

11-22-2015, 10:27 PM	#3
BRZ'13 Senior Member Join Date: Jun 2014 Drives: subaru Location: Hamilton ON, Canada Posts: 375 Thanks: 41 Thanked 92 Times in 67 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Seems normal (i hope). All the cars iv owned/scene have jt. Just make sure its not oil. I dont even bother cleaning mine

11-22-2015, 10:45 PM	#4
KR-S Sporadic Member Join Date: Nov 2015 Drives: 2016 Halo FR-S M/T Location: Earth Posts: 3,145 Thanks: 5,221 Thanked 3,552 Times in 1,746 Posts Mentioned: 50 Post(s) Tagged: 33 Thread(s)	It's totaled.

11-23-2015, 12:31 AM	#9
aegisdrgn Senior Member Join Date: Dec 2013 Drives: Scion FR-S 10 Series #2263 Location: Los Angeles Posts: 471 Thanks: 208 Thanked 277 Times in 179 Posts Mentioned: 4 Post(s) Tagged: 2 Thread(s)	If you're curious to learn more about the port / direct injection modes...you've come to the right forum! http://www.ft86club.com/forums/showthread.php?t=50827 http://www.ft86club.com/forums/showthread.php?t=3172

11-23-2015, 12:34 AM	#10
Hotrodheart Senior Member Join Date: Jan 2014 Drives: 2013 Scion FR-S Location: Kailua-Kona HI Posts: 401 Thanks: 46 Thanked 428 Times in 181 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)

11-23-2015, 07:26 AM	#11
Braces Senior Member Join Date: Sep 2012 Drives: 17 Alfa Romeo 4C Location: Scottsdale, Arizona Posts: 987 Thanks: 570 Thanked 711 Times in 365 Posts Mentioned: 14 Post(s) Tagged: 2 Thread(s)	Is that the same black soot on the floor?

11-23-2015, 10:18 AM	#13
extrashaky Senior Member Join Date: Mar 2014 Drives: 2014 BRZ Limited Location: USA Posts: 4,045 Thanks: 1,100 Thanked 5,618 Times in 2,266 Posts Mentioned: 55 Post(s) Tagged: 1 Thread(s)	You can monitor your AFR with Torque to see if you're running the right mixture. It usually runs about 14.5 to 1.

User Name		Remember Me?
Password