Quote:
Originally Posted by Ecky
I think what I'm going to do is make a window of ~1.25 lambda from 1000-2000rpm 0-500mbar manifold pressure, tapering to 1.07 lambda up to 600mbar, 1.0 lambda from 600-800 mbar, then go progressively rich at higher loads.
Reading through the above links, what I'm gathering is that in these regions, I can expect to need only 2-3° extra ignition timing for every 10% leaner I run - so at, say, 1.25 lambda 1500rpm 400mbar, I'll have an extra 6-7 degrees of ignition advance.
I don't have any flat roads nearby or access to a load dyno, so I'm basically shooting in the dark with my timing numbers.
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That sounds like the right ballpark, but I wonder if you want to run lean at minimum load, the engine might misfire there. The biggest gain from lean burn happens at medium load anyways, since your throttle loss reduction is proportional to load and lambda - 1.