placement of the converter

[biohazard65]

hey im getting an exhaust sytem put on my car in just over 2 weeks. and the guy was asking me where abouts i want my cat placed. he told me he was going to put it near the rear of the car as it has better top end performance. and i was just wondering wat happens if i put it near the front or middle and such. can any1 help please? thanks

 

[obi_waynne]

Cats are more efficient the hotter they are, this means putting it near the front of the engine. Most manufacturers go this route and it makes a lot of sense to me.

A cat that is cold for longer periods of time will not last very long IMHO.

Are we talking about a sports catalyst or a standard one?

 

[HDi fun]

I'd go for as close to the manifold as possible.

 

[lutonmatt]

as they have said there is a reason why they put it at the front and its so it gets red hot

plus i dont know if they have lamba sensors before and after the cat on them if they do will have to rewire the one after the cat so more messing around

 

[HDi fun]

Lambda sensors are usually upstream of the cat, frequently mounted in the exhaust manifold directly.

 

[herb]

Lambda sensors are usually upstream of the cat, frequently mounted in the exhaust manifold directly.

but some mine for example have 2 1 before the cat and 1 after

 

[pgarner]

most now have 2

 

[biohazard65]

..

ah cool thanks guys.

 

[HDi fun]

but some mine for example have 2 1 before the cat and 1 after

Diesel engines run open loop 2 way unregulated cats so there will not be any lambda sensors at all.

I think the ones you mention are pressure and exhaust temperature sensors to deal with the diesel particulate filter and it's periodic regeneration process.

I am assuming that your Cupra is a diesel.

 

[pgarner]

nope the vcupra is the same as mine. pre and post cat sensors to tell you if there is an emission problem

 

[Country Bumpkin]

If they are even asking about putting the cat at the rear of the car i would question their ability and knowledge of anything more technical than a space hopper.

 

[HDi fun]

nope the vcupra is the same as mine. pre and post cat sensors to tell you if there is an emission problem

Hadn't thought of that. So it's the 20V petrol engine in the Cupra then

 

[herb]

Hadn't thought of that. So it's the 20V petrol engine in the Cupra then

in mine yes:bigsmile: but there are cupra diesels too, a bit confusing

 

[HDi fun]

in mine yes:bigsmile: but there are cupra diesels too, a bit confusing

The TDi ones are well liked for their immense midrange torque. There's little to choose between the TDI and petrol models for overall driveability.