The ECU software on this 2008 Jaguar XF with a 2.7-litre diesel engine was updated and checked during a road test. The owner did not want the car put on a dynamometer, so no specific dyno power or torque measurements were taken.

During the test drive, engine parameters were checked, including boost pressure, fuel data and throttle response. After programming, the car accelerated smoothly; the video shows no pronounced turbo lag or visible smoke.

The assessment in this case is based on a road test and live parameters rather than a dynamometer measurement. No specific power gain is therefore stated.