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- There is optimal injection timing for best efficiency
- There is optimal boost level for certain injection level at certain RPM
- There is optimal cam (or cams) timing
You need to find those out by doing sweep runs and tests.
In general the EGR is not boosting efficiency so its not in use. I should still try to test will it help at low rpm and injection levels as there is a reason why it migth help to boost little bit efficiency.
In my own ecu programs is a AFR limitation to set 19 meaning, I will never go richer than that. There is no need. At higher rpms AFR can go over 45 if you want to get best efficiency.
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