|
Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
|
Thread Tools | Search this Thread |
04-19-2020, 07:00 PM | #15 | |
TRACKBREAD
Join Date: Mar 2016
Drives: 2013 BRZ
Location: Florida
Posts: 3,929
Thanks: 2,660
Thanked 4,024 Times in 1,895 Posts
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
|
Exhaust smell after header install
Quote:
The cat in the header IS the primary cat and does most of the work. The one in the front pipe is secondary. The smell does not go away after 10 minutes with a catless header. I personally hated the smell and ended up going back to the stock unit cause it wasn’t worth the 10hp bump over catback and 93 tune. |
|
04-19-2020, 07:10 PM | #16 | |
Senior Member
Join Date: Mar 2017
Drives: Q5 + BRZ + M796
Location: Santa Rosa, CA
Posts: 7,884
Thanks: 5,668
Thanked 5,805 Times in 3,299 Posts
Mentioned: 70 Post(s)
Tagged: 0 Thread(s)
|
Quote:
__________________
My Build | K24 Turbo Swap | *K24T BRZ SOLD*
|
|
04-19-2020, 07:21 PM | #17 | |
TRACKBREAD
Join Date: Mar 2016
Drives: 2013 BRZ
Location: Florida
Posts: 3,929
Thanks: 2,660
Thanked 4,024 Times in 1,895 Posts
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
|
Exhaust smell after header install
Quote:
That’s really cool, didn’t know that, but alas this isn’t a Koenigsegg. CvK does a lot of things differently because he can afford to, and the cars aren’t held to the same regulations because of the extremely low production numbers. Our primary cat is in the header. That’s why there’s an O2 sensor right before and right after it, and the front pipe does not have an O2 sensor. https://www.ft86club.com/forums/showthread.php?t=71412 |
|
04-19-2020, 10:04 PM | #18 | ||
Senior Member
Join Date: Mar 2017
Drives: Q5 + BRZ + M796
Location: Santa Rosa, CA
Posts: 7,884
Thanks: 5,668
Thanked 5,805 Times in 3,299 Posts
Mentioned: 70 Post(s)
Tagged: 0 Thread(s)
|
Quote:
https://en.wikipedia.org/wiki/Catalytic_converter Quote:
The O2 sensor locations are typically coming right off the exhaust manifold (so they can read oxygen for fuel mapping) and between the precat and main cat. Some cars have them after the main cat as well, but the precat is much more likely to fail because of the heat/proximity to the combustion chamber in terms of melting (so it is the best one to monitor), and the whole point of the o2 sensor is to detect oxygen for fuel mapping. The downstream sensors can detect catalytic health, but it is not their primary function. If you could show me a picture of the cat on the headers and the cat on the front pipe then I would accept what you say. This explanation was a nice read: https://mechanics.stackexchange.com/...ixture-control
__________________
My Build | K24 Turbo Swap | *K24T BRZ SOLD*
|
||
04-19-2020, 10:22 PM | #19 | |
TRACKBREAD
Join Date: Mar 2016
Drives: 2013 BRZ
Location: Florida
Posts: 3,929
Thanks: 2,660
Thanked 4,024 Times in 1,895 Posts
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Go unbolt the exhaust on your car if you don’t believe what has been discussed hundreds of times on this forum. You can search and find dozens of threads where the primary/secondary cats are discussed. |
|
04-19-2020, 10:30 PM | #20 | |
Airborne at your service
Join Date: Sep 2014
Drives: '17 BRZ Series.Yellow
Location: El Paso, Texas
Posts: 6,326
Thanks: 4,529
Thanked 5,587 Times in 2,929 Posts
Mentioned: 33 Post(s)
Tagged: 2 Thread(s)
|
Quote:
__________________
|
|
04-19-2020, 11:07 PM | #21 | |
Senior Member
Join Date: Mar 2017
Drives: Q5 + BRZ + M796
Location: Santa Rosa, CA
Posts: 7,884
Thanks: 5,668
Thanked 5,805 Times in 3,299 Posts
Mentioned: 70 Post(s)
Tagged: 0 Thread(s)
|
Quote:
As in primary and secondary or 1st and 2nd? Because then the precat is the first one.
__________________
My Build | K24 Turbo Swap | *K24T BRZ SOLD*
|
|
04-19-2020, 11:09 PM | #22 | |
Airborne at your service
Join Date: Sep 2014
Drives: '17 BRZ Series.Yellow
Location: El Paso, Texas
Posts: 6,326
Thanks: 4,529
Thanked 5,587 Times in 2,929 Posts
Mentioned: 33 Post(s)
Tagged: 2 Thread(s)
|
Quote:
__________________
|
|
The Following User Says Thank You to weederr33 For This Useful Post: | Irace86.2.0 (04-20-2020) |
04-20-2020, 06:02 AM | #23 | |
Senior Member
Join Date: Dec 2012
Drives: FR-S Whiteout
Location: California
Posts: 2,863
Thanks: 1,808
Thanked 790 Times in 611 Posts
Mentioned: 42 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I'd still check for leaks anyway and retorque after a couple heat cycles.
__________________
Intent > Content
cowardice is the mother of cruelty. |
|
04-20-2020, 12:02 PM | #24 | |
Senior Member
Join Date: Mar 2017
Drives: Q5 + BRZ + M796
Location: Santa Rosa, CA
Posts: 7,884
Thanks: 5,668
Thanked 5,805 Times in 3,299 Posts
Mentioned: 70 Post(s)
Tagged: 0 Thread(s)
|
Quote:
__________________
My Build | K24 Turbo Swap | *K24T BRZ SOLD*
|
|
04-20-2020, 12:32 PM | #25 | |
TRACKBREAD
Join Date: Mar 2016
Drives: 2013 BRZ
Location: Florida
Posts: 3,929
Thanks: 2,660
Thanked 4,024 Times in 1,895 Posts
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Not trying to get smoke to come out of your ears, but holy crap how many people need to tell you the same thing. These cars aren't Koenigseggs, they're not 90s MR2s either. They're not EJ25 Subarus. It's been long established that on these cars, and the vast majority of NA cars made in the last decade, the main (primary/supreme/heavyweight/wearing the pants in the relationship) cat is the one in the exhaust manifold. Last edited by Yoshoobaroo; 04-20-2020 at 12:42 PM. |
|
04-20-2020, 03:45 PM | #26 |
Senior Member
Join Date: Nov 2018
Drives: 2017 Toyota 86
Location: Washougal
Posts: 130
Thanks: 6
Thanked 51 Times in 29 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Lol that is funny shit...
|
04-20-2020, 03:47 PM | #27 | ||
Senior Member
Join Date: Mar 2017
Drives: Q5 + BRZ + M796
Location: Santa Rosa, CA
Posts: 7,884
Thanks: 5,668
Thanked 5,805 Times in 3,299 Posts
Mentioned: 70 Post(s)
Tagged: 0 Thread(s)
|
Quote:
The 3rd gen MR2 quoted was like 1999-2007. Just saying. Kinda after OBD2 adoption and not that long ago. I mean it makes sense what you are saying, that they would just use two high density units because why not remove as much pollutants as possible, regardless of detriments to performance. Quote:
I am curious if tuners use both o2 sensors for tuning like the OEMs, and I also wonder if the secondary cat is negatively effected in its ability to work by installing headers. I wonder if installing headers leads to premature failure of the other cat, and/or if the secondary cat can't do its job without the primary cat or without the ability of the oxygen sensors to properly manage the fuel delivery. I understand people often use o2 foolers, but it seems like those would provide some fixed value and not a dynamic value, which means the engine isn't getting the best feedback, which could make the engine run rich/lean. I have a Harrop kit with E85 on a Delicious Tuning tune, so I'm curious if their tune supplements the stock tune, or if it entirely replaces it, and if so, is it not using the second sensor or is it not considering emissions at all. I feel like it much be not altering things too much because when my engine is started while cold the rpms raise and bla bla bla just like normal. Still.
__________________
My Build | K24 Turbo Swap | *K24T BRZ SOLD*
|
||
04-20-2020, 03:51 PM | #28 | |
Airborne at your service
Join Date: Sep 2014
Drives: '17 BRZ Series.Yellow
Location: El Paso, Texas
Posts: 6,326
Thanks: 4,529
Thanked 5,587 Times in 2,929 Posts
Mentioned: 33 Post(s)
Tagged: 2 Thread(s)
|
Quote:
__________________
|
|
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Catless header exhaust smell? | Aegis3425 | Engine, Exhaust, Transmission | 18 | 03-18-2020 07:01 PM |
Looking to buy header - question about exhaust fume smell | localhost | Engine, Exhaust, Transmission | 29 | 08-15-2018 04:21 PM |
OEM exhaust manifold gaskets ok for aftermarket header install? | giorgi0424 | Engine, Exhaust, Transmission | 3 | 02-22-2017 10:43 AM |
Trusted shop for header/exhaust/suspension install in CT? | FirestormFlex | NY / NJ / CT / PA | 2 | 08-08-2015 11:59 AM |
Need help w/ header/exhaust install? Anyone | Boofneenee | New England | 11 | 09-19-2013 03:49 AM |