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Jag
Dodge Dakota
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10/16/2004
12:20:06
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 Subject: Cutting out the cat?
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Besides being against the law...harming the environment...blah blah. Anyone done it on the 5.2 or 5.9? I have done this in the past on a few of my other trucks and noticed a decent performance improvement, then again they all had high mileage and were probably stopped up.
How many O2 sensors the R/T have? I might give it a good if I won't get a CEL.
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Bob Lincoln
Dodge Dakota
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10/16/2004
13:47:40
| RE: Cutting out the cat?
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"then again they all had high mileage and were probably stopped up." That's just it. All the posts I've seen here and other sites claim it did not increase power and gas mileage. Probably they were stopped up.
Why not try a high-flow cat? They've got to be cheaper than the $440 stock cat I just had put on my wife's Camry. 8(
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daffydak
GenIII
10/16/2004
14:02:44
| RE: Cutting out the cat?
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I think I'm going to try a high flow cat, mainly for sound. I see NO reason to cut it off completely (or gut it) Unless its a purpose built racer :-)
Do what you want....
just my .02
00 CC Sport Plus 4.7L 4X4 Auto, 3:55 LSD
Flowmaster orig. 40 series (2 chamber) muffler, adjusted tps to .76V, ported TB, home brew intake setup w/K&N filter, more mods to come!!!
Dan
MOPAR=More Power!!
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deerridge
GenIII
10/16/2004
15:00:22
| RE: Cutting out the cat?
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We not drop the muffler and keep the cat. I would think the honeycomb in the cat would or could serve both purposes. Anyone know anything about that?
Real Horsepower
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Jag
Dodge Dakota
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10/18/2004
18:44:33
| RE: Cutting out the cat?
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Well the sound has to get better...that is my primary purpose...
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Jag
Dodge Dakota
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10/18/2004
22:34:00
| RE: Cutting out the cat?
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I haven't even looked under there...how many cats? 1 or 2? I assume there is a resonator and the muffler as well.
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MikeD
*R/T*
10/20/2004
11:41:54
| RE: Cutting out the cat?
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Depends on what year model you have but the 01's and after have 3 cats & 4 O2 sensors (2 before & 2 after the cats). I did notice a good increase in flow on the topend. I wasn't worried about torque because I had heads, cam, convertor...all that stuff. If you don't have at least a higher stall convertor I wouldn't cut the cats, you will loose backpressure and torque.
~Mike~
Get In...Sit Down...Shutup...& Hangon
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blndak
Dodge Dakota
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10/20/2004
15:39:36
| RE: Cutting out the cat?
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i cut the 3rd cat off my 01 r/t with flowmaster and i love how it sounds
i didnt notice any loss of torque
superchips, flowmaster, 4.56 gears, m1, gibson headers, ported stock heads, k&n cold air
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Kowalski
GenIII
10/20/2004
16:55:23
|  RE: Cutting out the cat?
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I've never heard anyone claim a loss of torque from removing the cat. Sounds like Bob Lincoln missed some posts about the '00 Daks. The 3 cat Daks are rated 5 hp less than the regular federal emissions package; there is definitely a bit of power to be had there.
Lead, follow, or get out of the way
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Bob Lincoln
Dodge Dakota
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10/21/2004
12:48:53
| RE: Cutting out the cat?
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5 HP out of what, 180, 230? That's 2-3%. Insignificant.
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Thumper
Dodge Dakota
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10/21/2004
14:36:56
| RE: Cutting out the cat?
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the big cat...the 3rd under the crossmember has no sensors go cheap man and cut that thing off gotta do it yourself though no place will touch that thing
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DennisO
Dodge Dakota
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10/21/2004
16:20:50
| RE: Cutting out the cat?
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Hey Bob why don't you go harp on someone else about emissions, no one here really cares what you have to say. Why don't you take a break from the dakota forum and go bug some chebbie owners.
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Bob Lincoln
Dodge Dakota
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10/21/2004
22:02:12
| RE: Cutting out the cat?
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You still need to breathe, we all do. People who don't give a damn about hurting other people's health are just as much criminals as someone who assaults someone else.
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mrman
Dodge Dakota
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10/22/2004
08:36:48
| RE: Cutting out the cat?
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Seems to me that only a small percentage of Dak owners want to, or already have, cut out their cat. Shouldn't Lincoln be concerned with the dump trucks, school buses, tankers, gravel haulers, and other big vehicles? No emissions controls there. Lots of stinky black exhaust.
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fastyz400
Dodge Dakota
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10/22/2004
12:52:55
| RE: Cutting out the cat?
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A little story from Random Technology: Have a look
"maximum air flow capacity"
But another factor, and one that’s often overlooked, is brick length - longer bricks offer higher flow resistance. On the other hand, if a brick is too short, it won’t offer sufficient area to effectively control exhaust pollutants. Converter manufacturers use different precious metal loadings of washcoats and vary them according to brick length and density. Brand notes, "Most converters currently being produced utilize bricks that are between three and four inches in length. This configuration allows lighter wash coat loadings and trades air flow efficiency for cost. Random Technology converters are specifically designed for maximum air flow capacity and our converters contain bricks with heavier washcoat loadings that are only two inches long. The combination of this brick technology and special case construction makes for maximum air flow - and maximum horsepower."
Dyno testing has proven that to be true. According to engine builder Mike Osucha, (MORE Performance, Charlotte, NC) "We recently built a 396-cubic inch LT1 engine that produced 455 horsepower with an open exhaust system. When we installed two Random Tech converters, the engine produced 458 horsepower. When you look at the complete test results, you see that at some points the engine makes more power without converters than with them. And vice versa. I think the bottom line is that there's a tuning effect when a slight restriction is placed in an exhaust system. But the real point is that with the right catalytic converters, you don't have to sacrifice any horsepower to make an engine emissions legal."
Since all catalytic converters must meet standards established by the Environmental Protection Agency, (EPA) their efficiency in controlling pollutants is a given - provided a particular converter is installed on the type of vehicle for which it was designed. Longevity is also comparable from brand to brand because EPA mandates require the converter case to be warranted for 50,000 miles and the bricks for 25,000 miles. That leaves flow - and horsepower - as the only major characteristic that varies to a considerable degree.
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Bob Lincoln
Dodge Dakota
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10/22/2004
19:09:05
| RE: Cutting out the cat?
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"Shouldn't Lincoln be concerned with the dump trucks, school buses, tankers, gravel haulers, and other big vehicles?"
The answer is yes. They'll have their day.
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fastyz400
Dodge Dakota
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10/23/2004
03:48:12
| RE: Cutting out the cat?
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Actually, Big rigs are required to burn cleaner now days. Cummins Engine Co. are in a scramble to produce cleaner and leaner big rig diesel engines right now. Because, of up comming EPA concerns.
To give you an example, they are looking at engines without a camshaft and will have infinite intake and exhaust valve adjustments. You wonder how the heck they are going to do this. lol, that's what i said.
They are looking at electromanetic valves. Basically kinda like your average silinoids. Electrical charge holds them open the the spring load sucks them shut. But, is done very fast. The engine management system will be able to adjust the timing of both intake and exhaust valves.
All this to make the EPA folks happier. Plus, cleaner burning and less emmisions.
Take a look at some new technology out for diesels at the present. Direct injection. Increases hp and cleaner emmisions.
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ticats
Dodge Dakota
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10/23/2004
10:08:04
| RE: Cutting out the cat?
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At the beginning of the track season, I replaced my cat with a straight pipe (fabbed it with flanges so pipe and cat can be swapped in and out because of clean air test every two years). Comparing to similar, past weather and track conditions, the straight pipe has lowered my 1/4-mile ETs by almost 2/10 sec. I'm quite pleased since I was expecting maybe a 1/10 off :-) Naturally, the exhaust is a lot louder, much like the sound from the mopar muscle cars from the late 60s and early 70s.
ticats, ontario, canada
'97 Dak CC Sport, 5.2L na modded, 44RE, 4.56SG, race weight 4,150 lb, 13.98 @ 99.85
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fastyz400
Dodge Dakota
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10/24/2004
13:00:29
| RE: Cutting out the cat?
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ticats,
Maybe you should try a Hi-Flow cat, you probably won't make much difference between no cat and cat. Plus, you won't have to switch them all the time.
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