Quote:
Originally Posted by AdrianD
I never knew about the air-flow meter adjustment. Could be different between the 1.8 and 1.6 models.
A new O2 sensor would definitely help.
There are reports of people who turbo Miatas and get better mileage if they keep out of boost, as the stock tune could be leaned out.
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I would not recommend touching closed-loop A/F. On a vehicle with a 3-way catalyst, net-lean operation (>~14.7 A/F on E0 or about 14.1 A/F on E10 ) will result not just in high NOx emissions - the Pt in the 3-way catalyst will oxidize most of the NO in NOx to NO2, which is still a problematic pollutant in many urban areas. NOx itself (NO + NO2) is also a major contributor to tropospheric ozone, which is also still a problem in urban areas, and contributes to nitrate secondary particle formation. Let's keep it clean.