This 2003 BMW E46 320d had already been tuned at another workshop, but the owner was not satisfied with how the car performed. We first tested it on a dynamometer to assess the result. The power curve was uneven, with a pronounced delay in turbo response.

After revising the software, we tested the car again. The video gives a final result of 158 hp and 385 Nm. Compared with the factory figures of 136 hp and 280 Nm, that is an increase of 22 hp and 105 Nm.

A dynamometer helps show more than a change in peak figures: it also reveals how power and torque develop across the rev range. In this case, the calibration was adjusted with the measured curve in mind.