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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 02-17-2021, 01:19 AM   #1
lrae21
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Exhaust issues

Hello,
I have a 2012 Toyota 86 with an Invidia N1 and Tomei uel headers. Recently I blew the cat and took it to an exhaust repair shop that fitted a universal high-flow cat to replace it. The exhaust note has dramatically changed and become much quieter, as well as driving a bit sluggish. Anyone have similar experience or know of any potential solutions? Cheers.
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Old 02-17-2021, 02:27 AM   #2
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Not sure about the drivability (likely due to the change of exhaust gas flow, just a guess), but I've heard the size of a cat (or a different cat) can change how the exhaust sounds. Hope you won't have an issue.
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Old 02-17-2021, 02:30 AM   #3
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Hey mate. Do you mean 'blew' your cat as in the actual guts blew out? If so then your exhaust became more free flowing and would have been a free performance upgrade.

Your new cat is restricting flow compared to the old one that was probably disintegrated.

Get the exhaust shop to delete it (replace it with a straight through pipe) to get your sound and performance back.

I run UELs and a Q300 and no cats.


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Old 02-17-2021, 02:33 PM   #4
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How do you blow a cat? (srs)
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There's a point at 7,000 RPM... where everything fades. The machine becomes weightless. Just disappears. And all that's left is a body moving through space and time. 7,000 RPM. That's where you meet it. You feel it coming. It creeps up on you, close in your ear. Asks you a question. The only question that matters. Who are you?
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Old 02-17-2021, 02:35 PM   #5
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How do you blow a cat? (srs)
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Old 02-17-2021, 02:43 PM   #6
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Knew this was coming...meow
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There's a point at 7,000 RPM... where everything fades. The machine becomes weightless. Just disappears. And all that's left is a body moving through space and time. 7,000 RPM. That's where you meet it. You feel it coming. It creeps up on you, close in your ear. Asks you a question. The only question that matters. Who are you?
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Old 02-17-2021, 02:45 PM   #7
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How do you blow a cat? (srs)
Usually from heat. Kinda weird he blew a front pipe cat. Usually FI guys have to worry about it or people running pop tunes.
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Old 02-17-2021, 02:46 PM   #8
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Old 02-17-2021, 02:47 PM   #9
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Usually from heat. Kinda weird he blew a front pipe cat. Usually FI guys have to worry about it or people running pop tunes.
Okay, thank you. This is my 10th post, maybe I can "thanks" now
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Old 02-17-2021, 03:13 PM   #10
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Usually from heat. Kinda weird he blew a front pipe cat. Usually FI guys have to worry about it or people running pop tunes.
A bad tune can burn one out in short order. Used to be a fairly common issue back in the early 90s when people were still learning how to tune ECUs. Too rich will flow more fuel into the cat than it can handle and POOF there it goes.
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Old 02-17-2021, 04:15 PM   #11
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So would runing rich actualy physically disintegrate the substrate, or just stop it catalysing?

Im guessing one of those stupid pop tunes would physically damage it.



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Old 02-17-2021, 07:11 PM   #12
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A bad tune can burn one out in short order. Used to be a fairly common issue back in the early 90s when people were still learning how to tune ECUs. Too rich will flow more fuel into the cat than it can handle and POOF there it goes.
Right, at the basis I understood it as misfires or running rich creates more heat and damages them. Or does the fuel itself cause issues with something like combustion in the cat since it holds so much heat itself
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Old 02-17-2021, 07:47 PM   #13
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Right, at the basis I understood it as misfires or running rich creates more heat and damages them. Or does the fuel itself cause issues with something like combustion in the cat since it holds so much heat itself
Both. I the case of the "pops" they of course are putting rapid pressure on the cats which are just simply not designed for such abuse.
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