16 replies to this topic

[minidude03]

what does a catalytic convertors do

[adam c]

They basically contain catalysts (platinum i think) that break down the unburnt hydrocarbons in exhaust emissions and turn it into water and CO2(i think). They basically reduce the exhaust emmissions from about 3.5% CO in non cat cars to less than 0.5% in cat cars. They are very expensive (compared to a standard mini exhaust system) and don't benefit the car particually, they just 'save the environment'.
Am not sure exactly how they work but theres a start...

[minidude03]

cheers dude, its a b****rd having one because its confusing wen getting a stage 1 kit or exhaust system because of the different link pipes n stuff.
does anyone know if u can just replace the cat systyem with a regular system without any mods

[Sam]

They also reduce power.

Lots of Scoobys and other cars are de-catted.

[Dom]

ill be getting mine decatted once i get a new exhaust :grin:

[minidude03]

so u just take the cat system off and replace it with a normal exhaust system?

[Sam]

I don't know if it is that simple.

If you take the cat out then what would happen the lambada sensor? And how would that effect fuel managment system?

[minidude03]

that was a question, not a statement lol

[adam c]

You should just be able to take the system off but not on some later cars are it would fail the emmisions for the mot. I'm not sure but thought that only injection cars have lambada sensors??

[minidude03]

ive got a carb and a cat, does that mean i dont have a lambda sensor, or does the cat need a lambda sensor to work

[bluebottle]

i think you'll find that all cars after '91 (j reg), i think, have to have a cat fitted for the mot

[Dom]

yeah i was told that also, which means mine is legal, H reg 90'

[Sam]

All cars K Plate and onwards have to have cats.

[Dom]

:grin:

[siggy]

Thats not quite true If your car is fitted with a old engine (pre cat) you do not need to have one fitted.

Siggy