Re: [doc] Cat replacement / Lambda-sensor
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Re: [doc] Cat replacement / Lambda-sensor



The lambda system reads the emissions* through the lambda sensor upstream of the cat, so getting rid of the cat will not affect the lambda system.

Getting rid of the lambda sensor will put the lambda computer into "limp home" mode and set the mixture a bit rich. You could dial this back down to anywhere between 1% and 2% and still pass a UK MOT and not damage the engine (1.5% is the setting for non-lambda european Volvo and Renault PRVs) but you'll still be relying on the lambda computer and frequency valve. The correct way to remove the lambda system is to fit a metering head that doesn't have a frequency valve port. However, once this is done, you've still got ignition timing appropriate for a leaner mixture. So unless you plan on changing Metering head, ignition distributor and control pressure regulator, there's not a lot of point in getting rid of the lambda sensor.

The cat bypass reduces load on the engine so it does make a noticable improvement.

Martin

* it actually reads the oxygen in the exhaust but this is used as an indicator of how complete the burn is in the engine and therefore what the emissions are

Stian Birkeland wrote:

Hi,

If you swap the cat with a crossover pipe, would this effect the Lambda-system?

Would the Lambda sensor not be necessary any more?

Would this also effect the actual CO2 emissions testing / passing on the MoT?

Best wishes
Stian Birkeland
Norway

VIN # 06759








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