afc and egt?

[Tamago]

Originally Posted by o89canucks

I don't see a difference on leaning out a turbo vs. na car, leaning is leaning wether you have a turbo or not.

the difference is that the DSM guy is probably leaning to 14:1. turbos make engines more efficient, volumetrically and thermally (at low boost)

stoich is 14.7:1. that's what the yaris ECU is going to try to achieve in closed loop. leaning the engine out further will simply overheat the exhaust manifold, as well as your pistons, valves, everything.

so you'll get better fuel mileage at the cost of engine longevity, which does more harm to the environment than leaving well enough alone.