The Freelander 2 2.2-litre Duratorq diesel platform (engine code 224DT / PSA DW12) left Solihull with two distinct calibration profiles. The TD4 delivers 150PS and 400Nm. The SD4 delivers 190PS and 420Nm. Both variants share the same long-block architecture, the same Bosch common-rail injection hardware, and the same variable-geometry turbocharger family. The performance delta resides in the engine control module calibration strategy — specifically, the torque-limiter maps, rail-pressure targets, and boost-control schedules that JLR engineers authored for the high-output derivative.

This upgrade installs those factory SD4 calibration parameters into your TD4 ECU. You retain the original hardware, the original service intervals, and the original JLR engineering validation — you simply access the performance envelope the platform already supports.

Why the TD4 and SD4 Share a Common Hardware Foundation

JLR engineered the 2.2 Duratorq for the 2011 model-year Freelander 2 refresh with a dual-calibration strategy. Both TD4 and SD4 receive the same Mitsubishi TD04L variable-geometry turbocharger on later production, the same Bosch piezoelectric common-rail injectors (part family 0445115042 / 0445116043), and the same Bosch EDC17CP42 engine control module. The SD4 specification unlocks higher rail-pressure authority and more aggressive boost targets — 22 PSI nominal with overboost to 28 PSI — without requiring different mechanical components[reference:5].

Earlier TD4 builds (2007–2010) used a Garrett turbocharger, and those vehicles benefit from the software upgrade within their hardware’s validated torque ceiling. The calibration package accommodates both hardware generations.

Technical Upgrade Pathway

The upgrade follows a software-first methodology. We read the existing EDC17CP42 calibration, verify the hardware identification against the JLR parts catalogue, and write the SD4 factory calibration file to the ECU. This is not a generic “stage tune” — it is the calibration set JLR shipped in the 190PS derivative, adjusted for the vehicle’s specific hardware configuration and market emissions standard.

For owners seeking performance beyond the factory SD4 envelope, a Stage 1 calibration layer is available. This builds on the SD4 baseline and delivers 215PS and 480Nm while retaining the factory safety margins for the turbocharger, injection system, and transmission[reference:6].

Measured Performance Outcomes

These figures reflect measured outcomes on JLR-specified dynamometer protocols. The SD4 calibration reduces 0–100 km/h acceleration by 1.4 seconds and adds 40PS of usable output across the mid-range — precisely the band that matters for overtaking, towing, and gradient response.

Engineering Safeguards and Platform Compatibility

We validate every calibration against the vehicle’s transmission specification before writing. The SD4 calibration from JLR pairs exclusively with the automatic transmission because the manual gearbox carries a 400Nm torque limit[reference:8]. Our process confirms your transmission type and applies the appropriate torque-limiter strategy. Automatic-equipped TD4 vehicles receive the full SD4 calibration. Manual vehicles receive a calibrated output that respects the gearbox’s validated ceiling while still delivering meaningful torque and power gains.

The upgrade preserves Haldex coupling behaviour, cruise-control functionality, diagnostic readiness, and all factory emission-control monitors. The ECU retains its original immobiliser data and VIN coding.

What the Upgrade Delivers in Daily Operation

The most immediate change is throttle linearity. The SD4 calibration removes the torque truncation that defines the TD4’s low-output map, so part-throttle response becomes sharper and the engine pulls cleanly to a higher rpm ceiling. Motorway gradients that demand a downshift in the TD4 become a single-gear pull. Towing stability improves because the engine sustains 420Nm over a broader crank-angle window. The platform finally delivers the performance JLR intended for the high-output derivative — without aftermarket hardware, without compromised service life, and without departing from factory engineering validation.

Ordering and Technical Support

Select your model year and transmission type at checkout. Our JLR calibration team reviews every order against the vehicle’s VIN and hardware identification before releasing the file. You receive the calibration tool, a vehicle-specific installation guide, and direct technical support from engineers who work with the 224DT platform daily.

Upgrade your Freelander 2 TD4 to SD4 specification today. Factory calibrations. Measured outcomes. JLR engineering integrity.