Hypothetical question regarding removing catalytic conv.

Forget about, "good," mileage or forget about RVing.

Remove it and there goes global warming again ... oh wait! Go ahead, remove it. We need global warming. It's -4 (wind chill) at my house again this morning! Maybe some of those California emissions will blow over Indiana and warm us up! We need some global warming here.

yes and no.

yes, removing the e.p.a. junk and using a tuner and bypass/ false sensors will give you a better running engine and increase your mileage and power for the same amount of fuel. as long as you don't use the tuner to make gains over the stock tune, just for clearing codes and adjust to a better operating curve.

no, i wouldn't do it. as it will void your warranty and may get you huge fines, due to state and federal emissions. the factory computer will record any changes and any devices attached to it. (serial number and type of device, along with the current mileage when the device was attached).

Come and do the jail house rock. Could happen you take that converter off. Especially in California. A hefty fine is certain.

Keep the cats, but do let us know about the Blackbear. Have you noticed any improvement around town?

mrkoje wrote:
This probably isn't the answer you want to hear but someone is going to say it anyways so it might as well be me.

If you remove your catalytic converter then you will probably not be in compliance with California emissions laws. I don't know the laws for California but if sure you guys out there have some sort of inspection. Without those cats I'm sure you would fail the inspection and probably have to pay hefty fine if someone turned you in.

Unless you are in a county that does not require the BI-annual inspection, I would think that you would be be in violation. What I have heard is that they look to see if everything is there that is supposed to be there. I do not have a diesel, but the gas vehicle inspections are tough enough to pass, especially when some of it is judgement calls. JMO

Cats flow very well and you wont see any appreciable difference.

Most OE cats are not restrictive as long as they have not had a melt-down. I know one V10 owner who removed his and nothing changed except it made the exhaust smell, so he put it back on.

ramyankee wrote:
Was talking to my grandson-in-Law this afternoon and gas mileage came up on our unit. I told him we would get 6mpg is not uncommon. He mentioned a friend that had a Ford Diesel, year unknown, that removed his cat converter and the fuel economy went up A LOT.
By my sig, would there be any advantage? I did install a tuner from Blackbear in September. But have not towed to check how it works.
I searched the generic question and got answers ranging from much more HP and 25% better mileage (Yeah, right) to it would run much worse and mileage would decrease....
Just curious as to any answers.

Trying to compare a gasoline cat converter to a diesel engine, diesel particulate filter is like comparing an apple to a poodle.

You might pick up a hair in fuel economy at wide open throttle with no cat. The new cats flow really good. They have 600 HP cat on some cars. Your engine puts out less than 400 HP. Leave it alone.

This probably isn't the answer you want to hear but someone is going to say it anyways so it might as well be me.

If you remove your catalytic converter then you will probably not be in compliance with California emissions laws. I don't know the laws for California but if sure you guys out there have some sort of inspection. Without those cats I'm sure you would fail the inspection and probably have to pay hefty fine if someone turned you in.