Anyone running catalytic converter on a turbo setup?

Mstng93SSP

You have a nice rear end there Dave.
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Is anyone running a turbo with a catalytic converter? I was thinking of replacing the short pipe where the cutout/dump part is with a 3" catalytic converter with v band clamp ends welded on. Would this effect the turbo negatively in any way? I have always run cats on my cars, I do not like the exhaust smell without them.

Thanks

Chris
 
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90sickfox

Wasn't a pretty sight...and I've got big hands
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I'm planning to have a cat on my car as well.
 
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Mstng93SSP

You have a nice rear end there Dave.
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Yeah, my thought is I will never use that cutout...or whatever it is called. So I figure a good 3" cat in place if it would work.
 

General karthief

wonder how much it would cost to ship you a pair
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Something that just dawned on me (where's the 'light bulb' emogi?)
Everybody talks about the stinky exhaust with no cats, I have no cats (well not for the car anyway)and never noticed any unpleasant odors (other than when I forget my deodorant, sorry Steve), never gave it much thought until tonight. Everybody was smelling a chemical rich odor, I was not, maybe cause with the spark plugs loose I was lean, less chemical, more oxygen.
Am I thinking this correctly is my cartoon mind confusing me?
I'm thinking I need to add cats to the list, fauck, gonna run outta carboard at this rate.
 

CarMichael Angelo

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This is a flowmaster " spun" catalytic converter that i had on the Monster maybe a couple of years ago...
20210413_214026.jpg


This is what it looked like after I ran it for a year.
20210413_214036.jpg


What do ya spose happened to all of the catalyst material that was inside this thing, and what do you think happens when a turbine impeller has to eat it?
 

MustangIIMatt

I need something stupid to play with
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So a cat pre turbo might be an issue, but after the turbo should be O.K. if I am reading you correctly.
You can run a cat pre-turbo if doing a rear-mounted setup. STS sells kits to do this, @a91what has done this, and I plan to do this myself (I have my reasons).

Most modern turbocharged cars have the cat mounted directly to or really close to, the turbo.

Observe:

20210115_113857-jpg.jpg


Those idiots in Dingolfing bolt the turbos in the valley, with the catalytic converters directly behind the turbos and under the edge of the cowl on the N63 V8. I see a LOT of coolant and oil leaks on plumbing for the cold side of the turbos on these, but surprisingly little in the way of turbo or cat failure considering all of the heat that they trap right there with all of the covers and shields.

The hard part is going to be choosing a catalytic converter that can handle the amount of exhaust flow you're pushing through it. As small as that converter Mike showed the pictures of is, I'm willing to bet he overwhelmed the substrate in it and melted it down.

Catalytic converters are the one subject that makes me wish I was still a member on AFM and that Tom Renzo was still active over there. He did actual testing on converter designs and understood the heat and fluid dynamics better than anyone else I've ever met. He was a big advocate for high-flow converters on high performance applications based on the improved exhaust velocity and improved scavenging over running cat-less.
 

SorsCode

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My Audi has the Catalytic Converter mounted right after the turbo. I think there is like 1-2" between the converter and the turbo flange. On my Mustang I run the converter a little farther downstream just because of space (Near where most H/X Pipes mount them.
 

7991LXnSHO

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I'm planning to have a cat on my car as well.
We had to replace this cat on the car as it did not protect the wiring.
Unless a convertor is too small or clogged, of course you can run one with a turbo. Factory turbo cars come with them all the time.
73EA1F45-17A1-4496-9F3D-D1C6E8055454.jpeg
55102A6E-1CEA-4A94-91FB-57D73B50C817.jpeg
 
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a91what

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This is a flowmaster " spun" catalytic converter that i had on the Monster maybe a couple of years ago...
20210413_214026.jpg


This is what it looked like after I ran it for a year.
20210413_214036.jpg


What do ya spose happened to all of the catalyst material that was inside this thing, and what do you think happens when a turbine impeller has to eat it?
I hope so, it will give me a reason to get better turbos
 

revhead347

Apparently my ex-husband made that mistake.
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This is a flowmaster " spun" catalytic converter that i had on the Monster maybe a couple of years ago...
20210413_214026.jpg


This is what it looked like after I ran it for a year.
20210413_214036.jpg


What do ya spose happened to all of the catalyst material that was inside this thing, and what do you think happens when a turbine impeller has to eat it?
Aftermarket catalytic converters are notoriously poor quailty to meet a price point. They cheap out on the alloys. That's why you get like $50 at the scrap yard for an OEM cat, and like a buck for an aftermarket one. Then you throw one of the crappiest brands on top of that for your nostalgic experience moment. I think your particular experience has value for a theoretical discussion, but isn't a hard and fast rule for making a turbo setup.

Kurt