FEOA Forums banner

1 - 15 of 15 Posts

·
Registered
Joined
·
63 Posts
Discussion Starter · #1 ·
Anyone know of a bypass for the converter other thank headers?
I'd just as soon kep the manifold without the converter.
thanks
ziton
 

·
Registered
Joined
·
4,556 Posts
You use to be able to buy test pipes that bolt directly in where the converter goes. I used them back in the 70's when it wasn't illegal to remove the converter. Just so you know it is against federal law to remove a converter from a car now. I forget what the penalty is, but I'm thinking the fine can be up to $25,000 and possibly time in prison. Even if you don't have emissions testing where you are it could be a serious problem if a policeman ever done a visual inspection.
 

·
Registered
Joined
·
63 Posts
Discussion Starter · #3 ·
What about headers theyre illeagle too?
I live in MS there is never a check. Also I don't travel outside the state so I'm not too worried about being checked. I'd like to get 45mpg though.
 

·
Registered
Joined
·
374 Posts
Take the coverter off the car and knock the stuff out of the inside of it and then your gonna have to get an MIL eliminator to take care of the CEL it's gonna throw when it fries the o2 sensor
 

·
Registered
Joined
·
4,556 Posts
Headers are not illegal, but if the converter is not relocated it is an illegal set up. Removing the converter won't help your mileage that much if at all. The only reason I removed them in the 70's was because leaded fuel was available then, which was cheaper and higher octane.
 

·
Registered
Joined
·
50 Posts
I found a nice OBX header and downpipe for my sons zx-2 and was wondering if the CEL will come on if the cat is gone.I know the lower o2 will sense more flow but will that throw the light on??
 

·
Registered
Joined
·
818 Posts
You guys really have NO CLUE as to how oxygen sensors work do you?

First off, deleting a converter will not damage the rear o2 sensor.

Secondly, o2 sensors measure oxygen content in the exhaust, NOT exhaust flow.

If you were to graph out the voltage readings of the first (front) o2 sensor, it would look similar to a SINE wave... Voltage goes up, indicating 'rich'... computer leans out the mixture. Voltage goes down, indicating 'lean', computer enrichens the mixture. Voltage goes up... well you get the picture.

The rear o2 sensor, on the other hand, has more of a 'lazy' pattern to it. Since the converter 'stores' oxygen, the rear sensor will not change like the front one does. When the rear sensor's graphs start to look like the front on, the engine computer assumes that the converter isn't working properly and sets a 'Catalyst Efficiency' code.

What eliminators do is intercept and change the voltage reading of the rear o2 sensor, 'fooling' the computer into believing that the converter is doing its job. Having these is almost as illegal as not having a converter for an on-road vehicle.

Those of you who are removing these things are just asking for trouble. The louder your exhaust is, and the more it farts, the more likely you are to get inspected for a converter. For a long time nobody really checked, but as these 4 cylinder cars get more and more obnoxious, the more they are checking these things.

Now if you drive sensibly and don't have an obnoxiously loud exhaust, your Escort isn't likely going to get checked... but then again under these conditions it doesn't make a lot of sense to remove the converter, as it really doesn't give you any performance benefits (at least without having a heavily modified engine).
 

·
Registered
Joined
·
818 Posts
karnage23 said:
I found a nice OBX header and downpipe for my sons zx-2 and was wondering if the CEL will come on if the cat is gone.I know the lower o2 will sense more flow but will that throw the light on??
1> YES it will make the light come on

2> For your son's? Do you want to pay his $25,000 fine or bail him out of jail when he gets caught running without a converter?

I expect kids to try to do this stuff to their own cars... this is the first I've ever heard of a parent wanting to do it for them...

Want to give him something fast? Get him a V8 Camaro or Mustang or something...
 

·
Registered
Joined
·
1,909 Posts
header - flex - hi flow Magnaflow cat(50 state legal)

I run a Hi Flow cat - its 50% bypass and meets emission standards with no CEL running OEM O2 sensor.

if for some reason you do get a cat MIL code - I have a How-To to make your own MIL Eliminator, its a sticky in our sites How-To section.
 

·
Registered
Joined
·
9,941 Posts
If you want to get technical its against federal law to remove a functioning converter from any car even if you replace it with a high flow unit. Its also illegal to change the converter's location as well. Of course, you could contend that the converter's location is behind the manifold/header and your "aftermarket replacement" just happens to be longer.

After reading all the laws I decided against doing the HO header on my car. I would rather not take the chance. Instead I'm going to make the HO into a 4-2-1 shorty that bolts to the stock cat. I can always turn it back into a longtube later if I want. The only place it won't be legal is CA but I don't plan on driving there anytime soon.

If you want to bypass the converter just get the ebay header. I guaranty if you find an offroad pipe it will cost about as much as the header and won't give the mileage or power increase of a header. This one is only $132 and a direct bolt-on. You will still need a CEL eliminator but you need that when ever you go catless.
http://cgi.ebay.com/ebaymotors/98-99-00 ... tsupported

Also, if anybody plans on removing the cat from their kid's car you should be willing and able to pay all their bail, fines, lawyer's fees, ect if they get caught. Even if you have to tell the court you did it and end up going to jail.
 

·
Registered
Joined
·
1,909 Posts
remember - a cats expected lifetime is only 60k miles - after that, an aftermarket replacement is legal. Magnaflow Hi Flows come with a sticker for underhood explaining a cat was replaced and at what mileage.. they are 50 state legal and CARB exempt.
 

·
Registered
Joined
·
9,941 Posts
97DragScort said:
remember - a cats expected lifetime is only 60k miles - after that, an aftermarket replacement is legal. Magnaflow Hi Flows come with a sticker for underhood explaining a cat was replaced and at what mileage.. they are 50 state legal and CARB exempt.
Automotive manufacturers are required to warranty the OEM cats for 8 years 80K miles.

CA recently changed their smog laws and now 90% of the cats on the market can't be shipped or sold there anymore. Magnaflow only has about 8 universal models that can be shipped there and they cost $250 each. They also no longer go by G.V.W. and engine size to select a cat. The vehicle now has to specifically be on a list showing which universal cat you can use on it.
 

·
Registered
Joined
·
773 Posts
I'm racing my car on a 1/4 mile oval, and hollowed out the converter. Do I need these MIL sensors or what ever they're called? I only have one more race to go with the car before the end of the year, so I don't really want to buy anything.

P.S. in case anyone is wondering why I would do this, it's because I couldn't hear the darn thing when the green flag dropped, and didn't want to spin my tires, and it doesn't have a tach, so it always stalled. :oops: But this should fix this problem.
 

·
Registered
Joined
·
9,941 Posts
They are called oxygen sensors. You need the one before the converter, the one after the converter is only there to tell if its working. If your racing you don't need the 2nd one, you will just have a check engine light without it but you would also have one without a cat.
 
1 - 15 of 15 Posts
Top