A 2013 Lancia Thema equipped with the 3.0 CRD V6 diesel engine arrived at AUTOCHIP.LV for a complete Stage 1 ECU remap. The owner wanted more power, stronger torque delivery and improved engine response. However, the initial dynamometer tests revealed something unexpected: the vehicle was producing considerably less power than its stated factory specification.

3.0 CRD V6: What Did the Baseline Dyno Test Show?

The Lancia Thema shares much of its engineering with the Chrysler 300. Its 3.0-litre V6 diesel belongs to an engine family also used in the Jeep Grand Cherokee. The factory figures quoted for this particular version were 190 hp and 440 Nm of torque.

Before making any software changes, the team carried out a baseline dyno test. The car felt sluggish, throttle response was poor, and acceleration was noticeably laboured. The behaviour of the automatic transmission also contributed to the impression that the vehicle was struggling to build speed.

To establish a more reliable baseline, approximately three to four dyno runs were performed using both third and fourth gears. Despite the repeated tests, the recorded figures remained well below the stated factory output:

• Measured power before remapping: approximately 156–160 hp.
• Maximum measured torque: approximately 374–375 Nm.
• Quoted factory specification: 190 hp and 440 Nm.

That is a substantial difference. However, a dyno result alone cannot establish exactly why an individual vehicle falls short of its nominal output. Mechanical condition, engine management behaviour and testing conditions can all influence the readings. In this case, the initial measurements provided a reference point for the subsequent tuning work.

Stage 1 ECU Remapping: 250 HP and 607 Nm

Following the baseline tests, the AUTOCHIP.LV team performed a Stage 1 ECU remap. This involves optimising the engine management software to make better use of the engine's available power and torque potential while monitoring important operating parameters.

Once the ECU software work was completed, the Lancia Thema underwent another dynamometer test. The measured results were significantly higher:

• Power after Stage 1: 250 hp.
• Maximum torque: 607 Nm.
• Power increase over the baseline measurements: approximately 90–94 hp.
• Torque increase: approximately 232–233 Nm.

Using the lowest initial reading of 156 hp, the measured power gain was 94 hp. Torque rose from approximately 375 Nm to 607 Nm. The dyno graph shown in the accompanying video illustrates the difference, with the blue curve representing the original software and the red curve showing the result after remapping.

These figures need to be interpreted in context. The vehicle's initial measured output was already considerably below its quoted factory rating. A gain of nearly 100 hp should therefore not be treated as a typical or guaranteed Stage 1 improvement for every 3.0 CRD engine. The outcome of an ECU remap depends on the individual vehicle, its condition and its starting performance.

Datalogging: Monitoring Boost and Fuel Rail Pressure

Professional ECU remapping involves more than simply increasing the numbers on a power graph. It is also important to understand how the engine behaves under load and whether its key operating parameters remain appropriate for the chosen calibration.

During the tuning process, the team recorded and reviewed engine datalogs. These included turbocharger boost pressure, Common Rail fuel pressure and other relevant engine management parameters.

Reviewing this data helps assess engine behaviour during testing and monitor the operating limits considered in the calibration process. Nevertheless, a successful dyno run does not automatically establish long-term engine or transmission durability. With such a substantial increase in torque, the mechanical condition of the automatic gearbox and the wider drivetrain remains particularly important.

Why Did the ECU Have to Be Removed?

Accessing the engine control unit was another important part of this job. On this Lancia Thema, reading and writing the ECU software required removing the control unit from the vehicle.

The ECU is located near the base of the windscreen, beneath plastic trim in the engine compartment. Reaching it involved removing several trim components and parts around the windscreen wiper assembly.

Once accessible, the ECU was removed and connected to programming equipment on the workbench. The ECU housing did not need to be opened.

This procedure takes more time than programming through the vehicle's OBD diagnostic port, but certain engine control units require a direct connection to allow the necessary software operations to be performed correctly.

Final Results: Why Baseline Dyno Testing Matters

This Lancia Thema 3.0 CRD demonstrates the value of measuring a vehicle's actual performance before carrying out an ECU remap. Although the quoted factory output was 190 hp, the initial dyno runs produced only around 156–160 hp. Following the Stage 1 calibration, the dynamometer recorded 250 hp and 607 Nm.

At AUTOCHIP.LV, ECU remapping is approached as a process involving software calibration, performance measurement and engine parameter monitoring. A dynamometer provides a direct before-and-after comparison under test conditions, while datalogging adds valuable information about engine behaviour under load. The accompanying video offers a closer look at the dyno results, ECU removal process and measured power curves for this particular vehicle.