This Audi Q7 4.2 TDI is fitted with two hybrid turbochargers. Before the new Stage 1 calibration, it produced 305 hp and 717 Nm on the dynamometer. The logs showed apparently normal turbocharger operation and fuel-rail pressure, but the injected fuel quantity varied significantly under load.

Those fluctuations suggested a possible fuel-delivery or injector issue, but no specific faulty component was identified. The owner requested a Stage 1 software calibration and planned to address the vehicle’s technical fault later before returning for another check. The calibration was carried out, and the subsequent dyno run produced 360 hp and 810 Nm—about 55 hp and 93 Nm more than the initial measurement.

These figures apply to this vehicle at the time of testing. The logs showed that the fuel-delivery fluctuations remained, so the power result does not mean the mechanical issue was repaired. The vehicle was already without its emissions systems before this work; their restoration is not shown in the video.