This BMW 530d E61, with a 3.0-litre diesel engine and an automatic transmission, arrived at AutoChip with a tune from another workshop. The first dynamometer run recorded 268 hp and 577 Nm, but the power curve was uneven.

Power fluctuations were visible during the test, and the control unit contained faults related to the fuel rail pressure sensor. The existing software was inspected, and its calibration was found to be insufficiently matched to the car's behaviour.

After diagnosis, the ECU software was revised and the car was tested again. The aim was not only to increase peak output, but also to achieve a smoother engine response and a more stable torque curve. The narration does not clearly state exact final power figures.