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brian dunckley
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PostPosted: Fri Oct 28, 2011 8:41 am    Post subject: cats Reply with quote

If i cut out my cats and weld a new pipe in its place will my ck engine light come on?
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RumbleBee#2331
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PostPosted: Fri Oct 28, 2011 9:06 am    Post subject: Reply with quote

yes, you will need 02 sims or a programmer to delete the code, unless you do either of these two you will always have a code and poor gas mileage
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mrpookyy


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PostPosted: Fri Oct 28, 2011 4:04 pm    Post subject: Reply with quote

NJ has emisions and you wont pass without them on there.
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thejunkman2005
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PostPosted: Fri Oct 28, 2011 6:41 pm    Post subject: Reply with quote

Why would you want to do that? That's just crazy. The cats play a huge roll in more than just emissions, but also to make sure that the engine stays properly tuned and not run too rich or too lean. They make sure the engine is always running a peak air/fuel ratio.

Now, a good set of factory cats dont' cost any power either. Just google it. Read all the info.

If you cat is plugged, you have a problem with your O2 sensors. And, then removing it will help power, since you are taking out a plugged cat. But, if you just replace them, and repair what caused them to plug up, and you are good as new.

Removing cats on a street truck, especially a fuel injected, is one of the craziest things you can do. Plus, consider that you wont pass emmisions, EVER, first part of the test to make sure the cats are there.

Do us a favor, don't remove them, there is 100 other ways to make power without removing the cats.

Len

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GronkdaSlayer
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PostPosted: Sat Oct 29, 2011 1:20 am    Post subject: Reply with quote

You don't have to remove the cat. You can replace it (them) with sports cat if available for the car/truck.

A lot of people who own the same car as I do (my track car that is), usually go for a sports cat or plain remove it since it restricts the exhaust flow. This is usually done when we put a F/I system on (SC or Turbo). People who do this without a FI system just do it to make more noise, since there is not much point doing it. You will get a CEL code for sure, probably a P0170 or something like this which can be neutralized anyway (there are a number of CEL deletion hardware). Since the Dodge can use a chip, this can be done that way too.

All in all, I wouldn't do this if the onle reason behind it is more noise. Plus it won't pass the emission test like someone else mentioned (a sport cat would have a better chance).

Edit: Junkman, the cat doesn't have anything to do with AF ratio, since it's only purpose is to transform polluting chemicals into more friendly stuff (CO2, N2 and H2O). The AF ratio is controlled by the MAF (or MAP depending on the vehicle).

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RumbleBee#2331
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PostPosted: Sat Oct 29, 2011 10:16 am    Post subject: Reply with quote

Edit: Junkman, the cat doesn't have anything to do with AF ratio, since it's only purpose is to transform polluting chemicals into more friendly stuff (CO2, N2 and H2O). The AF ratio is controlled by the MAF (or MAP depending on the vehicle).[/quote]

true but the cat does have the 02 sensor which plays huge role in engine performance thus you need 02 sims

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2011 Ram Sport Qc bought 8/11
2005 Black QC SRT 10 SOLD Sad 3/11
2004 4x4 #2331 Yellow Bee Sold Sad 3/11
2007 Daytona Charger R/T Plum crazy #320 of 1400
SOLD Sad 3/11
07 srt8 Jeep Grand Cherokee sold 8/11
07 Limited Jeep Grand Cherokee
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brian dunckley
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PostPosted: Mon Oct 31, 2011 1:54 pm    Post subject: Reply with quote

Thanks. I didn't know i would lose power. Just think i did it to all my mustangs oh well
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kay9
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PostPosted: Wed Nov 02, 2011 11:54 am    Post subject: Reply with quote

You will most likely pop a code in the P04xx range.

You can't turn off your rear O2's from your programer. You need it done via custom tune. I used non foulers.
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AlbertaHemi
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PostPosted: Wed Nov 02, 2011 10:01 pm    Post subject: m Reply with quote

You wont lose power, use the sims.
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