Garrett T3 60 Trim Turbo Compressor Map with Plotted Operating Line

This document is a compressor map for a Garrett T3 turbocharger with a "60" trim compressor wheel. The map plots pressure ratio (P2C/P1C, from 1.00 to 3.00) on the vertical axis against corrected air flow (W√(T1C/545)/(P1C/28.4), in lb/min, from 0 to 40) on the horizontal axis. A dashed line on the left marks the surge limit. Constant-speed lines are labeled with corrected shaft speeds of 56,400; 78,800; 96,300; 110,400; 121,900; 132,800; 143,700; and 153,700 RPM, with the formula RPM = N/√(T1C/545) noted. Efficiency islands are marked at 74%, 70%, and 65%, with the peak efficiency region near the map center. A red operating line has been drawn onto the map by the uploader, showing a plotted current setup: starting near 3 lb/min at a pressure ratio of 1.00, rising through roughly 9 lb/min at 1.09 and 18 lb/min at about 1.98, reaching approximately 2.87 pressure ratio at 28 lb/min, then extending flat at that pressure ratio out to 40 lb/min. A reader can determine where this operating line falls relative to the surge limit, efficiency islands, and turbo speed lines. The map itself is not vehicle-specific; it was filed under a 1993 Ford Probe.