In a continuing quest to understand the E38 I did some more logging last night.
It appears that the "Engine Zones" for LO, MED and High are as follows;
idle to 2800 is LO speed
2800 to 4000 is MED speed
4000 to Redline is HI speed
I am trying to figure out why they break it down as such and what is happening different when in the specific zone.
HT