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Old 01-08-2019, 04:46 PM   #1 (permalink)
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Exhaust flex turbo-diesel

I'm working on my exhaust right now. I got one of these woven stainless exhaust flex joints. Has anyone put one of these right after the turbo? It would be nice if I could put it there. But not sure if it gets too hot there. I'm talking about an inch away from the band clamp that the "down" pipe would go.

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Old 01-08-2019, 04:59 PM   #2 (permalink)
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When you say right after the turbo you mean before or after the downpipe Or on the up pipes before the turbo ?

I didn't see where you mentioned what platform you were working on or what engine ?

My LBZ Duramax has bellows on the up pipes but not on the downpipe.
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Old 01-08-2019, 05:14 PM   #3 (permalink)
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I'm not sure of the lingo, but I'm talking about on the back of the turbo there's a rib flange. It has a band clamp to another rib flange. I would like to weld the flex coupling an inch behind that.

Where the elbow is right now. (In place of the elbow) This is a Cummins 4BT

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Last edited by waterhorse; 01-08-2019 at 05:15 PM.
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Old 01-08-2019, 05:31 PM   #4 (permalink)
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For that close to the turbo Id suggest a exhaust bellow and not those woven ones. Ive seen a few of them come apart and cause issues.
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Old 01-08-2019, 05:55 PM   #5 (permalink)
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The flex piece can come several ways the mesh braid, the bellows single and double thick and the braid with the bellows inside.

What inside diameter ?

I may have a few pieces depending on size.
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Old 01-08-2019, 06:35 PM   #6 (permalink)
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It's 3" diameter. I could put about two feet of straight tube and then the flex. It seems like that would allot of stress on the band clamp. I guess I could put the flex anywhere in that two feet. How about 8" from the turbo?
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Old 01-08-2019, 06:40 PM   #7 (permalink)
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Mine are all larger but yes 8 inches looks like a good length if there is any stress I would add a insulated brace.



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It's 3" diameter. I could put about two feet of straight tube and then the flex. It seems like that would allot of stress on the band clamp. I guess I could put the flex anywhere in that two feet. How about 8" from the turbo?
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Old 01-08-2019, 07:25 PM   #8 (permalink)
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They do make turbo flex couplers that have a liner inside. Not sure if that is the type you have? They do last a bit longer than the others ones with no liner. I prefer to mount them vertically so they work in a compression/extension with the main vibrations or movement caused by the engine. I feel they last a bit longer in that configuration. I would think if it is the liner type, you could mount it just behind the 90 degree bend you have. Pointing it downward would be the way I would do it. Not sure where you are planning on running the rest of the exhaust though from your pic?
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Old 01-08-2019, 07:39 PM   #9 (permalink)
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They do make turbo flex couplers that have a liner inside. Not sure if that is the type you have? They do last a bit longer than the others ones with no liner. I prefer to mount them vertically so they work in a compression/extension with the main vibrations or movement caused by the engine. I feel they last a bit longer in that configuration. I would think if it is the liner type, you could mount it just behind the 90 degree bend you have. Pointing it downward would be the way I would do it. Not sure where you are planning on running the rest of the exhaust though from your pic?
Mine has woven stainless on the inside also. It's obviously not the same because it's about 1/2" thick. But I don't know if there is any kind of liner in between the two woven surfaces. I would like to cut the 90 bend off and weld the flex right there. It would be somewhat difficult to keep the 90. I would have to put another 90 right away going back.
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Old 01-09-2019, 06:03 AM   #10 (permalink)
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Braided stainless flex joints are just bellows style flex joints with braided steel over them to make them less flexible.

They're fine as long as you don't expect to hang a lot of weight off them or expect a short section to deal with a ton of flex.

I think you'd be fine putting one right off the turbo so long as the rest of the system is done properly.
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