WHAT IS CATALYTIC CONVERTER ?
A catalytic converter is an exhaust emission control device that reduces toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction. Catalytic convertors are usually used with internal combustion engines fueled by either petrol or diesel.
The internal structure of catalytic converters are like a sieve, and consists of hundreds of small chambers. Although this part is used to keep emission rates at legal level, it badly affects upper rpm engine performance of even unmodified stock vehicles because of it decelerates exhaust flow.
Catalytic convertor is a significant point especially in remapped vehicles. Because the values on the maps of a vehicle with catalytic converter can be increased up to certain level. After this level, the exhaust gas discharged from the pistons begins to compress and the engine performance is adversely affected by back pressure to the engine. At the same time, the temperature in the combustion chamber rises above the safe limit. Therefore, in order to obtain more power and torque, the catalytic convertor is either replaced by a sport cat with larger chambers, suitable for performance use, or is completely removed by using decat pipe (downpipe).
There are 2 lambda (O2) sensors located both before and after the catalytic convertor. When the catalytic convertor is removed, second lambda sensor begins to send wrong values to the engine control unit. So, the vehicle must be reprogrammed in order to engine begins to work correctly again. This re-programming also involves to balance engine torque according to new exhaust back pressure values, too.
We supply this service for the vehicles which is tuned usually Stage 2 or above. For complete cat removal, cat must be both taken off the car and deactivated from the ecu. For more details, please do not hesitate to contact us.