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Author Topic: Safe AFR/Lambda for OPF equipped cars  (Read 71 times)
xM1ke
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« on: February 01, 2026, 06:36:06 AM »

There isn’t much information available online on how durable an OPF is or how to keep it operating normally when tuning modern petrol engines. Can an OPF tolerate richer AFRs without being damaged?

For example, in stock calibrations for OPF equipped cars, OEMs target lambda at 1 until exhaust gas temperatures reach a certain threshold (930 degrees Celsius in my case). This is mainly for emissions. But similar to how running too rich on a diesel can increase DPF regenerations or even damage the filter, is there a point where going too rich on a petrol engine risks shortening the life of an OPF or cause it to fail?

Does someone on this forum have any experience with tuning cars and driving them at high loads/temperatures with the OPF still equipped? Making the engine run in component protection mode from a more "normal" set point (like 700 degrees Celsius) for engine health and running a normal AFR (like 0.8 - 0.84 lambda) for the amount of boost will result in lower EGTs compared to the OEMs fuelling strategy, but may significantly reduce the life of the OPF.
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