3" exhaust....almost.

[lookin]

Do you think that cat air tube could be used, as a Bernoulli effect PCV thingy, like that one you were talking about before Brent?

[Ondonti]

Quote:

Originally Posted by lookin Do you think that cat air tube could be used, as a Bernoulli effect PCV thingy, like that one you were talking about before Brent?

IMO it would be a bad idea because oil would clog up the CAT when it burnt. Ive thought of it before :P

Of course if you used a catch can then maybe it would be a decent idea.

[440trk]

Quote:

Originally Posted by Ondonti Basically everyone on TD's experience is that 2.5-3" sounds the same if not maybe the 2.5" being more droning. The airhole on his cat is cap'd off so its not a problem unless he removes it.

2.5-3" will be louder than stock, with some droning...but choice of muffler can make the droning a bit better or worse. A straight through muffler will most like make it worse. Regardless of drone....a straight through muffler is going to be much louder. That's fine if that's what you want.... I was just mentioning that its going to be loud.

The "Airhole" is an air injection port. It's purpose is to inject air into the second (or third) stage of a staged catalyetic coverter. If no air injection is to be used, that Cat is incorrect for his application. The Cat will NOT perform properly, and may even clog up faster, due to lack of proper temperature in the staged converter.
I am unaware of air pumps being used on these cars, which is why I asked why that cat was being used.

[irocelectric93]

I know its gonna be loud. Drone might be bad too....well just have to wait and see.

[lookin]

Quote:

Originally Posted by Ondonti IMO it would be a bad idea because oil would clog up the CAT when it burnt. Ive thought of it before :P Of course if you used a catch can then maybe it would be a decent idea.

So the tube vents into the cat, before the honeycomb, or too close to it? I wonder if you could reposition that vent to make the idea work.

I am not so sure I would trust a catch can if it vents too close. A can will always let some oil vapor through. Maybe it would be an acceptable amount though.

[lookin]

Quote:

Originally Posted by 440trk If no air injection is to be used, that Cat is incorrect for his application. The Cat will NOT perform properly, and may even clog up faster, due to lack of proper temperature in the staged converter.

I thought the air vent is there, on cats of that type, to help burn unburnt fuel vapor. Other than that, it is still exotic metals converting gasses by catalytic reaction. Or is the metal used and the honeycomb structure radically different on those cats?

Have I got this all wrong?

[Ondonti]

Quote:

Originally Posted by irocelectric93 I know its gonna be loud. Drone might be bad too....well just have to wait and see.

i think 2.5" is supposed to have worse drone sometimes just because drone doesnt happen at all rpms its just when the frequency coming out of you exhaust is the right frequency to vibrate the car. some people avoid certain cruising speeds because of it.


BTW as far as i have ever read on catalytic converter info pages, the cat works fine. Its universal. Thats why its capped off. It can be used with or without the air tube functional.

[irocelectric93]

Quote:

Originally Posted by Ondonti i think 2.5" is supposed to have worse drone sometimes just because drone doesnt happen at all rpms its just when the frequency coming out of you exhaust is the right frequency to vibrate the car. some people avoid certain cruising speeds because of it. BTW as far as i have ever read on catalytic converter info pages, the cat works fine. Its universal. Thats why its capped off. It can be used with or without the air tube functional.

Thats the way i took it which is why i ordered that cat. If it doesnt work it doesnt work. Ill figure it out when i get the rest of the kit and go to put it on. My old 3" setup sounded "alright" for a v6 car with no mods and being an auto but drone was terrible. It had a cherry bomb muffler on it though. Hopefully the magnaflow will be better even though its a straight design. Like i said well just have to wait and see.

[lookin]

If you want to totally eliminate drone then do the following.

Get a few cans of expandable foam at Home Depot. Get the kind that wont over expand and warp window frames. Then squirt it between interior panels and the body and under the back seat, and then squirt some between the back seat and the trunk etc.

Your car will be much quieter after that. You may add maybe as much as 30 ounces of weight to your car is all. The stuff is nearly weightless.

No more drone.

It worked like a charm on my van.

[Ondonti]

might try that a bit on my race car when I get some of the holes filled up lol.

[lookin]

Who cares if their race car is quiet though?

Are you being a smart ass Brent?

[mopar3.0]

say good buy to your body when water get trapped in tha foam, rust will love it

[lookin]

It wont absorb water. They wouldn't use it for insulating door and window frames if it did..

[DustyR/T]

Quote:

Originally Posted by Ondonti BTW as far as i have ever read on catalytic converter info pages, the cat works fine. Its universal. Thats why its capped off. It can be used with or without the air tube functional.

+1 Brent. It's capped to be used both ways. And as stated above, the extra air injected just helps convert the NO2 gasses into less harmful, more emissions friendy gasses. I have never heard of anyone getting a "clogged" cat because it didn't inject air. What materially is different about them? They both have palladium and platinum like every other. And the gasses pass through them like others. The only thing to be concerned about when purchasing a cat is that it must be able to work efficiently for the engine size which is why universal apps in catalogs ask the CID.

[lookin]

Dusty do you know where the air tube vent is in relation to the honeycomb? Is it before or after it?