147 1.6 Eco (105Hp) - Removing the catalytic converter and sensors is ok? - Alfa Romeo Forum
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Hmmm 147 1.6 Eco (105Hp) - Removing the catalytic converter and sensors is ok?

Hello everyone!
I have a 2002 Alfa 147 1.6 T.Spark Eco (105Hp).

Can I Remove the catalytic converter and sensors from my car?
will it be bad for the engine?
how will it affect the ECU?

I am going for a straight pipe from the exhaust manifold to the side of the front bumper for weight loss, my car only have 105 HP, grip and weight loss is all I have in my budget.
I am building it for racing only.

Thank you for your help!
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ItaPita is offline  
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you can remove the cat but keep the sensors . you will have to weld in a ring to the exhaust for the lambda to screw into .
then all will be fine but maynot passs an mot because of emmissions
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You'll need a catalytic converter between the pre-cat O2 sensors and the post-cat sensor.

Either that, something called a lambda faker can be used. I've only seen this at the shop.alfisti site but it's probably available elsewhere.

The issue is Euro 3 engines monitor cat efficiency and not having something to tell the system that the post cat O2 sensor is sensing catalysed gas will bring on an error and limp home.

Either use a cat in there, or a lambda faker or have it remapped to delete the post cat O2 sensor monitoring.

I've heard a cat somewhere is your best bet as someone thinks TSs run better with "back pressure". I doubt it's back pressure but a cat may well regulate gas pressure fluctuations for better running. That's my take on what I read.
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The ecu can be remapped to not search for the lambdas.
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