[powellrm]

This was a hell of a thread to read through-wowzers. You guys leave no stone un-turned. I found this thread after researching my own question I posted earlier about adding a cat to the dpf delete pipe. Buzzken sells their delete pipe with an optional add on cat (another $200 i think?). Was the consensus from this thread that people wish they were able to retain a cat in their downpipe for dpf replacement?

Cheers.

[Torqu3]

I think in your last thread you mentioned it being a daily driver. I would say that getting a cat to reduce smell is well worth it. Also, I highly doubt having that one cat is going to affect your HP and TQ figures all that much.

[eric-satx]

Probably not supposed to post here, but if someone on a budget is looking for the parts:
http://www.e90post.com/forums/showthread.php?t=1317982

[powellrm]

Honestly, the power and performance is great and all, but I want reliability in the form of "addition by subtraction". So for me, reducing smell by a little is great. I don't think it'll impact HP/TQ numbers, but wouldn't care even if it did.

[BB_cuda]

Update on the vibrant 1458 gasket that we spoke of many pages back. The part has been updated. It is still a 2 hole/3" application. The holes are now elongated. Before, they were slightly off alignment with the Ecotune pipe. Those of us that used it had to sort of force it and slightly deform the 2 small holes. I recall the spacing on the holes of gasket was slightly too big. Anyway, I picked up 2 more from Summit and the picture is attached. I commented in another thread but it belongs here in this "beast" of a thread.

[JuiceQuadre]

Guys, im sorry if its there somewhere in those 100 pages, but how does various temperatures and pressures change after the dpf delete? Are the egt and exhaust pressures still the same?

[pbdm4k]

Recently did the full turbo back exhaust and although it's nice driving with no SES light, the smell does get to me when I'm idling at red lights.

I'm looking to add a catalytic converter to help with the smell.
http://www.idparts.com/inch-diesel-c...er-p-4969.html

This one is relatively small in size compared to other ones I've seen out there and shouldn't have a problem being fitted to the exhaust.

Just wondering if I should be concerned that soot will one day plug this thing up and where I should put it on the car?

As close to the turbo as possible?

[Hoooper]

Originally Posted by pbdm4k

Recently did the full turbo back exhaust and although it's nice driving with no SES light, the smell does get to me when I'm idling at red lights.

I'm looking to add a catalytic converter to help with the smell.
http://www.idparts.com/inch-diesel-c...er-p-4969.html

This one is relatively small in size compared to other ones I've seen out there and shouldn't have a problem being fitted to the exhaust.

Just wondering if I should be concerned that soot will one day plug this thing up and where I should put it on the car?

As close to the turbo as possible?

Check where it was run on, say, a toureg 3.0 TDI (pre-07) and try to put it about the same distance from the turbo. Since its a diesel specific cat it may be able to got further back down the exhaust but looking at the stock location would tell you.

[BB_cuda]

Originally Posted by pbdm4k

Recently did the full turbo back exhaust and although it's nice driving with no SES light, the smell does get to me when I'm idling at red lights.

I'm looking to add a catalytic converter to help with the smell.
http://www.idparts.com/inch-diesel-c...er-p-4969.html

This one is relatively small in size compared to other ones I've seen out there and shouldn't have a problem being fitted to the exhaust.

Just wondering if I should be concerned that soot will one day plug this thing up and where I should put it on the car?

As close to the turbo as possible?

This is a generic aftermarket CAT. Note how they say to put it in downpipe. This implies it should be close to turbo outlet. This CAT is pretty big so I don't feel it would fit well into a down pipe (at least a 335D one). This is my opinion though.

Whether it will plug up would depend on the cells per in^2 spec. A race cat is around 100 to possibly 200 cell per in^2. The higher the cell count, the more restrictive the CAT. There are more space efficient CATS out there that would fit into down pipes. It's likely easier for you to buy another downpipe with the CAT already in it than to have one retrofitted into an already finished downpipe.

http://mandrelbendingsolutions.com/h...ic-converters/

The above link has the smaller CATs I speak of but they are not diesel specific.

[Torqu3]

Originally Posted by pbdm4k

Recently did the full turbo back exhaust and although it's nice driving with no SES light, the smell does get to me when I'm idling at red lights.

I'm looking to add a catalytic converter to help with the smell.
http://www.idparts.com/inch-diesel-c...er-p-4969.html

This one is relatively small in size compared to other ones I've seen out there and shouldn't have a problem being fitted to the exhaust.

Just wondering if I should be concerned that soot will one day plug this thing up and where I should put it on the car?

As close to the turbo as possible?

I can't really say anything to help you out with your question, but I've got a question for you. I'm looking to get a turboback exhaust done soon and am unsure whether to get the downpipe with a cat, or the one without. You said it gets to you when idling at red lights. Is that with the windows down or up? I just am not sure if I need to get a cat or not, and there's about a $200 price difference.

[Persian Whisperjet]

I do notice it at traffic lights with the windows up assuming the fan is on, but it's intermittent. Maybe I am just inured to it at this point but it's really not that bad, it's not "cough cough" like my old Mercedes 300D, it's not the rotten eggs from the '76 Pinto you had with the early catalytic converters, but it's just a slightly odd smell.

[BB_cuda]

Originally Posted by Torqu3

I can't really say anything to help you out with your question, but I've got a question for you. I'm looking to get a turboback exhaust done soon and am unsure whether to get the downpipe with a cat, or the one without. You said it gets to you when idling at red lights. Is that with the windows down or up? I just am not sure if I need to get a cat or not, and there's about a $200 price difference.

I don't smell anything unless windows are down and stationary.

[9mmkungfu]

Originally Posted by BB_cuda

http://mandrelbendingsolutions.com/h...ic-converters/

The above link has the smaller CATs I speak of but they are not diesel specific.

I have their 50-cell converter on but further downstream vs factory. It helped.

[pbdm4k]

Originally Posted by Torqu3

I can't really say anything to help you out with your question, but I've got a question for you. I'm looking to get a turboback exhaust done soon and am unsure whether to get the downpipe with a cat, or the one without. You said it gets to you when idling at red lights. Is that with the windows down or up? I just am not sure if I need to get a cat or not, and there's about a $200 price difference.

If the cabin fan is on and the car is idling, the smell eventually gets into the car.
My commutes are long and mostly highway, so my current process is leaving the heat off as I creep through traffic to the highway, and when I get to the highway, I turn on the heat. (Mornings are starting to get chilly where I'm from. I imagine AC will be another challenge in the summer.)

I'm finding the smell doesn't really get into the car unless the vents are on and the windows are up. The smell definitely gets in with the windows down.

Never knew how much of a difference the DPF/DOC makes, but I bought a 3" Cat for diesels from Eastern Catalytic and intend to have that welded to the car.

Other ideas running through my head along with having a cat installed are converting my exhaust to a single exit out the passenger side and adding a resonator to quiet it down a little more.

With regards to differences between Catalytic Converters for gasoline and diesel, my questions to manufacturers and research has lead me to conclude that they are different and not cross compatible as the materials needed for reaction differ between the two fuel types.

[BB_cuda]

Originally Posted by pbdm4k

I'm finding the smell doesn't really get into the car unless the vents are on and the windows are up. The smell definitely gets in with the windows up.

Even with the recirculation button pushed? There are 2 settings too. Complete seal off is with the right side of the button turned green.

This is no different than being stuck behind someone's old school diesel at a light. My recirc door broke on the truck and I instantly noticed outside smell coming in. After door linkage problem was solved, the stink stopped coming in.

[DieselOG]

Originally Posted by pbdm4k

I'm finding the smell doesn't really get into the car unless the vents are on and the windows are up. The smell definitely gets in with the windows up.

I'm interested in the discussion about the smell as I've see it brought up a fair amount. I'm hoping to straight pipe in the next month or two, coming from two deleted TDI's I have never noticed a smell in the car unless parked for an extended period with the windows down or standing outside the car. Maby I just didn't notice it, and to be honest I like the smell when standing by the car.... Is there anything that makes these cars smell more than other deleted diesel car?

[pbdm4k]

Originally Posted by DieselOG

I'm interested in the discussion about the smell as I've see it brought up a fair amount. I'm hoping to straight pipe in the next month or two, coming from two deleted TDI's I have never noticed a smell in the car unless parked for an extended period with the windows down or standing outside the car. Maby I just didn't notice it, and to be honest I like the smell when standing by the car.... Is there anything that makes these cars smell more than other deleted diesel car?

I've heard people say that these common rail diesels do smell differently because they burn the fuel better. But that also results in a different, yet arguably more unpleasant smell. I find with this car, the exhaust smell is fairly strong and it doesn't take much idling for it to waft it's way into the cabin.

I'll be putting on a cat to help with the smell. It's not something I like.

[BB_cuda]

This isn't a factual answer so take it with a grain of salt. Older diesels run at higher compression ratio (around 20:1). This should cause a higher burn temp. M57 is 16.5:1 as this burns cooler and should reduce NOx formation. My subjective reasoning is higher CR should result in more complete burn. TDI has commented before that his M57 smells way worse than his 2004 ram with cummins which is emission equipment free from factory. I recall that he says it is a common rail though. DWR, you're welcome to calibrate my statements if you ever look at this thread.

[TDIwyse]

Originally Posted by BB_cuda

...TDI has commented before that his M57 smells way worse than his 2004 ram with cummins which is emission equipment free from factory. I recall that he says it is a common rail though. ...

Yes. With the same fuel on multiple platforms (2 indirect injected diesel tractors, 1 direct injected diesel generator, 04 RAM HO non California CR diesel engine, and then the 335d) the deleted 335d has the strongest smelling exhaust at idle. The 335d also has the lowest compression ratio. But it might also have to do with injection timing at idle.

I think having a DOC with a controllable exhaust bypass would be pretty neat...

[DieselOG]

My 12' Jetta had full deletes and that a 2.0 CR so I'm interested to see the difference between the two after I'm done. I agree, a DOC with a bypass would be a sweet touch for those who wanna cut back the smell

[BB_cuda]

When you say controllable exhaust bypass, you mean turbine bypass but always flowing through DOC, right?

[pbdm4k]

Just a comparison of the cat size from Eastern Catalytic that I plan on putting in the exhaust compared to the DPF.



I'm thinking I'll put it after the first bend off the down pipe so its easy to access should I ever need to hack it out to replace.