Dotted lines represent the projected torque and power values using linear regression if there was no clutch slip. Data are unaltered as produced by the dyno machine and input into Excel for analysis.
The original chart is here.
According to the graph, peak power is at 5718 RPM. Assuming ideal conditions, a 2.5L engine would flow about 530 cfm of air at 1.1 bar of boost pressure... about 366 crank horsepower. This compares favorably with the 290 PS measured at wheels, and sounds pretty reasonable for 4WD drivetrain loss while also taking the clutch slip into account.
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