Emmisions Concern..

[Guest]

I dont care but am curious



Do you guys w/ 600's that have deleted the STUPID CAT think it will pass emmisions????

 

[RDusch]

It won't if they look at it!



I'm making mine a quik change... ... . RD

 

[Guest]

I am using the old band clamps for a quick in/out change over when necessary!!!!!!!

 

[RDusch]

I'm doing the same thing, i will be able to switch between delete pipe, cat, or a resonator for the long rides... ... RD

 

[GCross]

I don't know where you're locted but it sure wouldn't pass the smog test in this neck of the woods. Also, you will be in violation of state and federal law and the bottom line is that you probably wont see any increase in power or MPG. Leave it alone and enjoy your legal truck.

 

[nickleinonen]

bottom line is that you probably wont see any increase in power or MPG

if the cat on the 600's is anything like the cat i had on my old 6. 5TD tahoe, it sure is a massive restriction and you will gain MPG and turbo spool up time removing it.



wait a few years and it will be plenty plugged up... soot traps don't work well on diesels unless they are kept clean by replacing them regularly.



just my $0. 02

 

[GCross]

Originally posted by nickleinonen

if the cat on the 600's is anything like the cat i had on my old 6. 5TD tahoe, it sure is a massive restriction.



wait a few years and it will be plenty plugged up

Per John Holmes Service Mgr at Carson Dodge, the new CATS are not as restrictive as some older ones and by removing it you will de-tune the engine and will have to make other modifications. The long term prognosis, well that remains to be seen.

 

[nickleinonen]

removing it you will de-tune the engine

prove that.



if you were to remove the cat and add a higher flow muffler, you will see an egt drop [which is good for emissions, less NOx], and quicker spool up by there being a greater pressure differential between the high & low sides of the turbine... restriction on a turbo engine is not good...



if you want to keep the cat feel free to do so. but if someone wants to remove it, let them. it isn't going to throw any codes like on a gas engine with o2 sensors. it will run better than with one there. but they are the one taking the risk of being caught with it not there. for e-test, put it back, then remove it when done...

 

[RDusch]

There is a noticeable difference in performance in the upper rpm's and without the cat i've been averaging a 75-100 degf reduction in egt, i installed gauges the first weekend i had the truck and running empty just moderate acceleration would yield egt's of 1300 degf before reaching 80 mph, no i can barely hit 1200.



i did'nt dynoed the truck with the cat but from numbers iv'e seen my numbers without the cat look better (see sig).



It's a good thing John Holmes Service Mgr at Carson Dodge does'nt have any ocean front property in Arizona for sale.



Rick



PS when you feel like preaching CLICK HERE

 

[GCross]

Originally posted by RDusch





PS when you feel like preaching CLICK HERE

No, I don't feel like preaching, I'm just expressing an opinion, like most others here I'm not an expert mechanic or an engineer. The point John was making was that the CAT is an integral part of the new fuel/computer system that saved us from EGR and has the least restriction that was possible, and no, I don't believe he has any real estate for sale.

 

[GDouglas]

If there are some of you that will not be putting the cat back in for emission purposes, just take a long prybar or pipe and beat the substrate inards apart inside the cat until you get it all out, then reinstall your "new" less restrictive cat back in place. If your area that your truck is registered in ever requires sniff testing, the visual inspection part will pass since you have a "cat" in your exhaust system.



The manufacturers have to conform to tighter emission standards than most state inspection standards. As a vehicle ages, emissions usually increase somewhat and the factory has to put out a product when brand new that will continue to meet standards over a reasonable amount of time/mileage. In my opinion, if you maintain your truck properly with proper oil change intervals, good fuel and fuel additives, etc. , most trucks will probably pass emission tests with no cat inards at all. I have seen it done on modified gas engines with dummy cats in place and the sniff test still passes.

 

[Matt400]

Interesting this subject would even come up. There must be some States doing Diesel emission testing or inspections.



I live in one of the most strict states- CA and there is nothing for Diesels as of yet. They don't test em or look at them either.

maybe its just the county I live in but the local smog shop confirmed there is no testing/inspections on the Diesel pick-ups in our area, maybe its different for areas that have more smog issues.



Even the muffler shop has no problem pulling one off but of course would not even think of doing it on a gas vehicle.



Who has inspections? do they tail pipe test or just look?

 

[mberry]

I had to have mine smog tested here this year. They actually put it on a dyno to put a load on it, run it up to 45mph and test the tailpipe emissions. Mine is stock and passed with flying colors. Of course, 5 minutes on the freeway to the next county and no smog required.

 

[Matt400]

Good reason to ask for the CAT back if you have it taken off if you sell to someone in another county the seller is responsible for the smog to pass here in CA.



An 03 CAT for the CTD is 900. 00!

 

[GCross]

Quote. . live in one of the most strict states- CA and there is nothing for Diesels as of yet. They don't test em or look at them either.

******************************

I believe we get checked in the South Coast Air Basin, LA. OC, SD, Ventura, and Santa Barbara Counties. The first when the vehicle is 4 years old and every 2 years thereafter. By the time my truck is 4 years old, I will be out of here.

 

[Guest]

"CATS" I now use mine as a beehive cause thats what it looks like!!!!