Is this normal? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Impureclient · 12-08-2017, 12:23 AM

I don't drive much so I know that between the exhaust holding a lot of moisture from not burning it off and having a catless header, I will get more soot but this seems excessive.
This goes all over the rear up to the wing on the trunk. The header and tune have been on a while and this really seems to have started in the last couple months and not exactly
coincide with the install of header/tune. AFR is ok according to what I posted in the software tuning section. Could it be the header/tune and colder weather combo?
This is after about 3/4 tank of gas or two weeks.

Mr.ac · 12-08-2017, 01:10 AM

Yep. Answered your own question.

It's hardly noticeable from the pics. Nothing a little water less car wash spray won't fix.

8RZ · 12-08-2017, 09:21 AM

Yeah on all the cars I've owned in the past that were catless I noticed more exhaust soot build-up on the tips and bumpers, c'est la vie.

Tcoat · 12-08-2017, 10:47 AM

The function of cats is to get really hot and burn off excessive emissions. When they are removed they can not burn everything up and the result is more carbon deposits from the tail pipe. As the weather gets colder the burn off is even less resulting in even more deposits.
Unless you reach a point where you can coal roll on launch it is perfectly normal.

12-08-2017, 12:23 AM	#1
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)	Is this normal? I don't drive much so I know that between the exhaust holding a lot of moisture from not burning it off and having a catless header, I will get more soot but this seems excessive. This goes all over the rear up to the wing on the trunk. The header and tune have been on a while and this really seems to have started in the last couple months and not exactly coincide with the install of header/tune. AFR is ok according to what I posted in the software tuning section. Could it be the header/tune and colder weather combo? This is after about 3/4 tank of gas or two weeks.

12-08-2017, 01:10 AM	#2
Mr.ac [insert cool phrase here] Join Date: Aug 2015 Drives: BRZ Premium Location: Central Coast CA Posts: 2,368 Thanks: 709 Thanked 1,559 Times in 930 Posts Mentioned: 30 Post(s) Tagged: 0 Thread(s)	Yep. Answered your own question. It's hardly noticeable from the pics. Nothing a little water less car wash spray won't fix. __________________ New daily driver - Subaru BRZ Premium Weekend fun/track car - '91 MR2 Turbo Gen3 Old daily driver - '88 MR2 Supercharged Last edited by Mr.ac; 12-08-2017 at 02:38 AM.

12-08-2017, 10:47 AM	#4
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,841 Thanks: 61,656 Thanked 108,295 Times in 46,456 Posts Mentioned: 2499 Post(s) Tagged: 50 Thread(s)	The function of cats is to get really hot and burn off excessive emissions. When they are removed they can not burn everything up and the result is more carbon deposits from the tail pipe. As the weather gets colder the burn off is even less resulting in even more deposits. Unless you reach a point where you can coal roll on launch it is perfectly normal. __________________ Racecar spelled backwards is Racecar, because Racecar.

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