Quote:
Originally Posted by Bindegal
Is it known if the graph represents emissions output before or after the cat? (my guess is before)
It seems to me like many modern cars run AFR 14.7 / lambda 1.0 as often as possible. Even at WOT until very high RPM. Basically sacrificing economy and power for catalytic converter efficiency in keeping emissions down.
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I have seen similar graphs in various texts that go back to the 70's. It is an example of engine out emissions before any remediation techniques are applied to an "average" engine.
And, you are correct that most modern cars sacrifice performance/economy for emissions.