This BMW E46 Coupe with a 3.0-litre diesel engine had been tuned at another workshop. The owner felt that the car had gained power, but the initial dyno run showed that the output was not well balanced with torque: it recorded about 204 hp and 514 Nm.

Inspection of the ECU file found that the EGR valve had been mechanically blanked, but its operation had not been correctly programmed in the control unit. AutoChip revised the calibration and adjusted engine output. The engine, turbocharger and the rest of the engine setup remained standard.

After the work, the dynamometer recorded 252 hp and around 676 Nm. This result made it possible to compare the previous software with the new calibration rather than relying only on how the car felt on the road.