First, forgive the Excel color theme. As I promised a while back, this is the compressor map for the stock turbos according to Ford's model in the ECU. The RPM lines aren't the highest resolution so they're definitely not perfect. Still has to be a lot more accurate than the hand-drawn one floating around here IMO.
Also I'm not 100% sure on the shape and placement of the surge line. It just seemed weird to me that it basically cut right through the most efficient part of the map, but I did find other Garrett compressor maps with similar appearances.

Also I'm not 100% sure on the shape and placement of the surge line. It just seemed weird to me that it basically cut right through the most efficient part of the map, but I did find other Garrett compressor maps with similar appearances.
