De-cat....

[BillyW124]

I thought id start a new thread as in my previous one regarding the exaust, i got down to the subject of de-catting because i dont want to shell out 1300 squids for the whole down pipes unit which includes the cat.

My lambda is up on the exit manifold so im thinking this may be actually possible given the MOT etc etc..

So can i de cat the 124?

 

[BillyW124]

no one knows?

 

[BlackC55]

I very much doubt it will pass an mot without any cat.

 

[BillyW124]

cheers mate, but are we saying it can be done however?

so having the lambda based next to the manifold as opposed to mounted on the cat pipe itself wont make a difference then?

 

[momomo]

Billy the cat is still needed to reduce the emissions. The lambda is used to adjust mixture etc. by the ECU.

 

[BillyW124]

Billy the cat is still needed to reduce the emissions. The lambda is used to adjust mixture etc. by the ECU.

LOL..ok so that sounded like a dumb question! :bannana:

ok now seeing as i have a type of MOT station, can i actually de cat the thing? Do i need to get some sort of 'de cat' pipe or somthing?

yes as you can tell, not a bean really.

 

[mazza]

cheers mate, but are we saying it can be done however?

so having the lambda based next to the manifold as opposed to mounted on the cat pipe itself wont make a difference then?

you can mount the lambda sensor closer to the exhaust manifolds.

must be mounted between 9 o'clock and 3 o'clock position...never below those positions as the lambda may be damaged by condensation.

providing your AFR is spot on..you should pass the emmisions test with or without the cat. law says you should have a cat fitted...but if you do decide to chop the cat off...you wont be the only person that broke the law.

cheers
mazza

 

[BillyW124]

you can mount the lambda sensor closer to the exhaust manifolds.

must be mounted between 9 o'clock and 3 o'clock position...never below those positions as the lambda may be damaged by condensation.

providing your AFR is spot on..you should pass the emmisions test with or without the cat. law says you should have a cat fitted...but if you do decide to chop the cat off...you wont be the only person that broke the law.

cheers
mazza

Thanks mazza, I see what you are saying, i think my mixture is ok, not sure if you are aware of where the lambda is mounted on my car but its on the upper most side of the exit manifold towards the back. I believe on the 320's they are mounted next to the cat itself..

 

[mazza]

Thanks mazza, I see what you are saying, i think my mixture is ok, not sure if you are aware of where the lambda is mounted on my car but its on the upper most side of the exit manifold towards the back. I believe on the 320's they are mounted next to the cat itself..

Hi

is this the set up?? item 195

Shot at 2011-05-24


if so...i reckon you can still retain the same position

if do decide to move the lambda, may i sugest for you to get 2 lambda bosses, one for the ecu and one for an AFR meter...that way you can monitor your AFR and very useful if you want to do a power upgrade like forced induction...just a thought

mazza

 

[BillyW124]

..i tell you what let me find the right set up.. i think i can get it from one of those russian sites

..thats not the set up i have

 

[BillyW124]

here it is:

the first pic with the second cat shown

the second pic where my lambda sits

 

[mazza]

Hi

My fault billy ...I didn't read the thread properly. your Lambda is in the perfect position.

mazza

 

[BillyW124]

Hi

My fault billy ...I didn't read the thread properly. your Lambda is in the perfect position.

mazza

no problem Mazza, this is the reason why i thought a de cat can be possible as the lambda is mounted in a good position.

So are we able to clear up somthing here? If by doing this, are you saying the emissions would be ok and pass without the cat or are we still saying that it may fail obviously as the cat will be no longer to filter out the gasses?

but as momomo said lambda just makes good reading to the ECU, so it controls mixture.

i really am not bothered about the underwriting of if the car has to have a cat or not.

 

[BillyW124]

has anybody heard of these guys?... Eberspächer

 

[NW_Merc]

It's not a problem decatting it, or the position of the lambda sensor. Its to do with the cat being there to give you the correct emissions. With a V8 you can take away 2 cats as it has 2 others. On your car, as its a 4 cylinder only needs one cat. Remove it and see if it passes the emissions. It might pass but it might not, you take your chances.

 

[chubbs111]

ref

has anybody heard of these guys?... Eberspächer

eberspracher used to make night heaters for lorries and coaches they used to be top notch stuff

 

[BillyW124]

It's not a problem decatting it, or the position of the lambda sensor. Its to do with the cat being there to give you the correct emissions. With a V8 you can take away 2 cats as it has 2 others. On your car, as its a 4 cylinder only needs one cat. Remove it and see if it passes the emissions. It might pass but it might not, you take your chances.

see this i dont mind as the guy at the garage is a chap! and will pass it.

just want to make certain but yea you are right take a chance with it.

the company mentioned above make OE cats apparently...

 

[BillyW124]

eberspracher used to make night heaters for lorries and coaches they used to be top notch stuff

they used to be?

 

[Martyn_n]

has anybody heard of these guys?... Eberspächer

They are a big company that produces exhausts, radiators and cabin heaters etc. Not sure if they are, or have been, oem suppliers to Mercedes but wouldn't be surprised.

If you do remove the cat, and it passes the emmissions let us all know as I'd like to do it, just not brave enough. I have a kit car with a lambda sensor but no cat and it gets "very close" to catalytic emmissions, but no cigar, therefore no MOT if my car actually required those emmission levels. That is why I am wary.

As I understand the emmissions are checked against a database of all cars and not against a specific cut-off point for all cars. As the info would have come from the original type approval process for the car and, with all respect, our cars are no spring chickens so they probably need as much help as possible to remain compliant and removing the cat would probably be a step too far.

 

[BillyW124]

cheers Martyn,

thing is do you just chop it off and weld another pipe in place of the cat?