Quote:
Originally Posted by serialk11r
pigrich under load? How they gonna pass emissions :confused: If emissions standards are getting stricter...they have to be going more lean right?
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They run Stoich, which gives a cleaner burn, at lower loads and go rich under moderate-heavy loads. It varies.
Go read a guide to OBDII ECUs and current emission systems.
Edit: Lean burn would only be done under light loads like cruising. And it would require a separate NoX cat and only for limited amounts of time. The US has very strict NoX emission regulations.