RRS 3.0 Ingenium I6 Diesel D250 to D300/D350 Factory Upgrade
Product Code: LR-RETRO-ING-D250-D350 | Vehicle: L494 Range Rover Sport (2017-2022) | Engine: 3.0L AJ20D6 Ingenium I6 Diesel
Welcome to the definitive JLR technical guide for upgrading your L494 Range Rover Sport 3.0 Ingenium I6 Diesel from the factory D250 calibration to the full-fat D300 or D350 specifications. This is not a generic remap; this is a factory-specification upgrade that mirrors the exact powertrain calibration used by Jaguar Land Rover for the higher-output variants. We also cover the specific nuances of the Defender D350 power upgrade for L663 applications.
Technical Overview: The AJ20D6 Ingenium I6
The 3.0L Ingenium I6 diesel (AJ20D6) is a modular, all-aluminium straight-six engine featuring a single twin-scroll turbocharger, 2500 bar common-rail direct injection, and a variable geometry turbo (VGT) actuator. The D250, D300, and D350 variants share identical hardware: same turbocharger, same injectors, same high-pressure fuel pump, and same intercooler. The only difference is the ECU calibration (ECU: Bosch MG1CS008).
Key Hardware Commonality:
- Turbocharger: BorgWarner BV45 (same part number across all three variants)
- Injectors: Delphi DFI 2.2 (flow rate identical)
- HPFP: Bosch CP4.2 (same delivery pressure)
- Intercooler: Air-to-water charge air cooler (same core)
This hardware parity means the D250 is artificially detuned from the factory. Our upgrade restores the factory D300 or D350 calibration maps, including boost pressure, injection timing, rail pressure, and torque limiter tables.
Performance Comparison: D250 vs D300 vs D350
| Parameter | D250 (Stock) | D300 (Upgrade) | D350 (Upgrade) |
|---|---|---|---|
| Power (PS) | 249 PS (183 kW) | 300 PS (221 kW) | 350 PS (257 kW) |
| Torque (Nm) | 600 Nm | 650 Nm | 700 Nm |
| 0-100 km/h (sec) | 7.6 sec | 6.5 sec | 5.8 sec |
| Top Speed (km/h) | 209 km/h | 225 km/h | 234 km/h |
| Fuel Economy (combined) | 7.8 L/100km | 7.6 L/100km | 7.5 L/100km |
| ECU Calibration | Bosch MG1CS008 (detuned) | Factory D300 map | Factory D350 map |
What is the Difference Between D250 and D300 Defender?
For the L663 Defender, the D250 and D300 share the exact same 3.0L Ingenium I6 diesel hardware. The difference is purely software. The D300 calibration increases boost pressure by approximately 0.15 bar (from 2.35 bar absolute to 2.50 bar absolute) and advances injection timing by 2 degrees crank angle at full load. This results in a 51 PS and 50 Nm increase without any mechanical changes. The D350 Defender upgrade follows the same principle but with a more aggressive torque ramp and higher rail pressure (up to 2200 bar vs 2000 bar in D250).
Upgrade Process: JLR Technical Workflow
- Vehicle Assessment: We verify the ECU part number (Bosch MG1CS008) and ensure no DTCs are present. We also check the turbocharger actuator sweep for mechanical integrity.
- ECU Read: Using a BDM (Background Debug Mode) interface or OBD direct read (depending on ECU version), we extract the full flash file (typically 4MB for the application block).
- Calibration Modification: We modify the following maps using WinOLS or PCMFlash:
- Boost pressure target map (load vs RPM)
- Fuel injection quantity map (mm³/stroke)
- Rail pressure setpoint map
- Torque limiter (driver demand) map
- EGR rate reduction (optional, for improved response)
- Flash Write: The modified calibration is written back to the ECU. No hardware modifications are required.
- Validation: We perform a road test with live data logging (boost, rail pressure, lambda, IAT) to confirm the calibration is within JLR safety margins.
Why Choose LR-Retrofit for Your D250 to D300/D350 Upgrade?
- Factory-Spec Calibration: We do not use generic “stage 1” files. Our calibrations are derived from genuine JLR D300 and D350 factory files, ensuring OEM drivability and reliability.
- Defender D350 Expertise: We have specific experience with the L663 Defender D350 power upgrade, including the unique torque vectoring and transmission adaptation required for the 8HP76 gearbox.
- No Hardware Required: The upgrade is 100% software-based. No new turbo, injectors, or intercooler needed.
- Warranty Safe: Our calibration stays within the factory hardware limits. We do not exceed 700 Nm on the D350 map to protect the ZF 8HP transmission.
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