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6.5L Turbo Diesel 1992-00 6.5TD - Discussion forum for the 6.5L engine.

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  #1  
Old 05-18-2009, 06:23 PM
w6bauer w6bauer is offline
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Default Soot trap or cat?

I just removed my nearly new stock exhaust system on my 96 and am looking at what some call the soot trap and the inside looks an awful lot like a cat. I do have the f vin engine which is not supposed to come with a cat. I am wondering if the dealer I bought it from replaced the exhaust system with an s code style. How do I tell the difference just by looking at it?

The reason I ask is I will be trying to sell the old system and have no idea what, if any, the price difference would be for a cat vs a soot trap. Any help would be greatly appreciated! Just installed straight pipe for cheap and need to get rid of the nearly new (15,000 mi) old system, behind downpipe.

Thanks

Will
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  #2  
Old 05-18-2009, 07:19 PM
Hubert Hubert is offline
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Soot trap is just what diesel guys call it. Its nearly the same thing as a Catalytic converter. Or Catalyist converter or Cat I can't spell and my chemistry is so rusty I barely remember H2o is water. Anyway its a honycomb looking material that gets hot in the exhaust and reacts with the exhaust gases to react and remove some oxide or other. Something about the Nitrogen in air getting so hot in combustion and reacting and creating Nox's etc. Not sure how different it really is from a gasser CAT similar but probably slightly different. You might find a technical post on it. But CAT is used commonly in a lot of post and is too short so not sure of good search word phrase.

It surely doesn't keep a diesel from belching black smoke or trap soot from escaping by intent. More or less it does restrict the exhaust gasses and is kinda like a trap maybe why its called a soot trap because it seems to soot up and foul over time with a very poorly running engine. Or maybe that it traps the exhaust gas to increase heat for the catalyst reaction?
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97 5spd K2500 Ext Cab short Bed ~160K miles.
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  #3  
Old 05-18-2009, 10:37 PM
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6.5 Detroit Diesel 6.5 Detroit Diesel is offline
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Get rid of it. You and your truck will be happier.
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1993 HD2500- 4X4, Nv4500, rc/lb, Lots of mods, killed her. Awaiting her TT rebuild!

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  #4  
Old 05-19-2009, 06:14 AM
w6bauer w6bauer is offline
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Its already off of My rig. I was going to punch the inside out and put it back on but searching online they run almost 400 bucks brand new. I figure there's someone out there who might want it so I decided not to destroy it.
The burb wasn't as loud after I pulled the cat and muffler as I thought. Will a larger pipe give me more sound or just a deeper tone? I do have noticeably better throttle response and I got an extra 2 mpg on My last tank. also I can actually hear the turbo spool now which was never audible with all that restriction.
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Old 05-19-2009, 09:33 AM
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The "cat" as used in a light-duty diesel is more accurately defined as a Diesel Oxidation Converter (DOC). The DOC is a ceramic honey-combed structure that is washcoated with a layer of catalyst materials (Platinum, Palladium and other rare-earth base metals). These catalysts chemically react with the exhaust gases to convert nitrogen oxides (NOx) into nitrogen dioxide and to oxidize (burn) hydrocarbons and particulate matter (PM = soot).

Jim
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  #6  
Old 05-19-2009, 10:44 AM
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6.5 Detroit Diesel 6.5 Detroit Diesel is offline
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Going to 4" is as big as you will need. Anything bigger is kinda pointless. Big tips are fine, but if you start going with to big of pipe the whole way, the 6.5 will sound a little tinny, IMO.
Throttle response, better mileage, and the sound of your turbo, all are a good payback for opening it up.
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1993 HD2500- 4X4, Nv4500, rc/lb, Lots of mods, killed her. Awaiting her TT rebuild!

2002 Camaro L36/M49- Killed In Action

1995 HD2500 - 4X4, NV4500 rc/lb, GL4, Turbo, exhaust

1994 HD2500- 4X4, NV4500, ec/lb
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  #7  
Old 05-21-2009, 11:17 AM
w6bauer w6bauer is offline
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yeah i will definitely be going with a 4 inch system. I need to get a new downpipe though, i see what all the talk is about how it is basically almost crushed in half from the factory.
Good to know about the diesel cat and the fact that it does contain basically the same elements as a gasser which means i will be able to get a good price for it at a scrap yard, and even better if someone is looking to buy one.

Will
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  #8  
Old 05-21-2009, 03:05 PM
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rameye rameye is offline
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Hey be careful the way it looks when your done, the emissions guys look for it!

How to cloak it is th ecause for another post!
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95 Suburban 1500 Bone Stock Orig.
purchased at 103K from first owner
new alternator/autozone gold @104K
re-trannyed with shift kit @107.5K
new Bilsteins all around @ 127K
Kennedy exhaust @128k ..zoom!
new lift pump w/OPS bypass @ 130K
Kennedy FSD cooler @ 135K
New IP/Injectors/G-plugs @ 137k
Another autozone alternator and Optima Reds @ 150K
Another pump and injectors @157K
New chain and gears @157K
HO pump single therm setup @157K (will see what happens)
Head gasket or worse to be determined...164k
NEW AM General 6.5 installed and running well! @ 164K!!!!!
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Old 05-22-2009, 02:54 AM
w6bauer w6bauer is offline
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I haven't consulted the law book but eveyone ice asked in indianapolis tells me there are no regulations for diesel powered vehicles as far as emissions. Almost every diesel pickup at My school has straight pipes and monster stacks in the bed.

Also, apparently there is no set maximum decibel level for any vehicles. They can write you a ticket for disturbing the peace for an extremely loud exhaust.
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  #10  
Old 05-22-2009, 06:02 AM
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rameye rameye is offline
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Good for you!

Here in the great communist state of Ct. if a cat/soot trap was original equipment, you'd better have one for inspection!

Enjoy your much enhanced performance..
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95 Suburban 1500 Bone Stock Orig.
purchased at 103K from first owner
new alternator/autozone gold @104K
re-trannyed with shift kit @107.5K
new Bilsteins all around @ 127K
Kennedy exhaust @128k ..zoom!
new lift pump w/OPS bypass @ 130K
Kennedy FSD cooler @ 135K
New IP/Injectors/G-plugs @ 137k
Another autozone alternator and Optima Reds @ 150K
Another pump and injectors @157K
New chain and gears @157K
HO pump single therm setup @157K (will see what happens)
Head gasket or worse to be determined...164k
NEW AM General 6.5 installed and running well! @ 164K!!!!!
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