Hi,

Since this forum is a community of many experienced tuners, lot of you know answer to my question.

In my Marelli 8GMK Giulietta i have found something weird to me. I have Base spark advance map and RPM/Intake efficiency max torque spark advance.
As i understand Base spark is start point map for timing. max torque map is ideal best timing for efficiency, in assumption if there is no knock and advance in bBase should be lower at some points to prevent of knock, but if there is no knock, Base timing should be equal to max efficiency. But there are some points, where Base is bigger than Max efficiency. As I understand if spark is too early, then efficiency drops. Maybe this is for emissions? Is a good thing to retard Base to Max effic, where it is possible?

Thanks in advance.