Quote:
Originally Posted by Ecky
Although going higher may not be the best for fuel economy with all else being equal, by leaning the burn out you can open the throttle plate more and run at a higher load, which helps too. The Insight goes as high as 25:1 or 26:1 sometimes, presumably to keep the throttle plate open.
You would probably be better off running only slightly lean and regearing to get load up, but lean burn is a more versatile and easier way of keeping load high.
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I see, so I guess I will stay this lean since I haven't experienced any issues so far. Today I managed to hit 18:1 without issues either. I will have to analyze data logs to see if there is any difference in throttle opening. Stock it's about 15.5% throttle opening at 50% engine load at 2500 RPM or 65 mph. I'm not sure about lean burn at above 2700 RPM. the burn rate might be too slow for engine speed and cause problems. so lean burn will have to be restricted to 65 mph for now.
update: new throttle opening is at 18%. so about 2.5% more opening at 17:1 AFR.