RR 3.0 INGENIUM I6 DIESEL D300 UPGRADE TO D350 FACTORY VERSIONS

Genuine JLR factory calibration. Full D350 output. No hardware changes.

JLR produces the D300 and D350 3.0-litre Ingenium straight-six diesel on a single, unified hardware platform. The turbocharger assembly, high-pressure fuel system, injectors, cylinder head, and 48-volt mild-hybrid generator unit share identical OEM specifications across both variants[reference:0][reference:1]. JLR differentiates the two power levels exclusively through powertrain control module calibration and Central Configuration File limits[reference:2]. This upgrade activates the factory D350 calibration already resident within your vehicle’s OEM firmware. You gain the full D350 specification through genuine JLR production-line programming, without altering a single mechanical component.

Performance Transformation: D300 vs. D350

These figures reflect JLR’s published factory specifications for both variants[reference:3]. The D350 calibration extends peak torque availability by 500rpm, sharpens throttle response, and sustains stronger mid-range delivery for highway overtaking and heavy-load towing[reference:4]. The integrated 48-volt MHEV system synchronises with the upgraded PCM parameters to deliver smoother power transitions while preserving factory idle quality and cruising refinement.

Hardware Commonality and Calibration Logic

The Ingenium I6 diesel employs twin turbocharging with an electric supercharger and a 48-volt mild-hybrid system. JLR fits this identical boosting and electrification architecture across D300 and D350 variants, along with the same ZF 8HP automatic transmission and fuel system internals[reference:5]. The performance difference originates entirely from factory software restrictions that regulate turbo boost pressure, fuel injection duration, and torque limits on the lower-tier calibration[reference:6]. The upgrade removes these calibrated boundaries by enabling the official D350 mapping preloaded within the stock vehicle firmware. All OEM thermal protection, DPF regeneration, SCR dosing, and emission compliance protocols remain fully active after programming[reference:7].

Technical Process: JLR Pathfinder DoIP Standards

We perform the upgrade using the same diagnostic infrastructure that JLR production lines and authorised dealerships employ. The procedure runs through the vehicle’s ENET diagnostic port using JLR Pathfinder DoIP standards. Our certified technicians conduct a full pre-programming network diagnostic scan, log all existing DTCs, and securely back up the original CCF configuration file[reference:8]. A professional DoIP VCI connection establishes encrypted Pathfinder gateway access. We enable the factory D350 powertrain flags and flash the official OEM PCM calibration data. The process synchronises updated parameters across the PCM, CCF, instrument cluster, and central gateway ECU to maintain complete system harmony[reference:9]. We clear residual fault codes, validate network stability, and conduct a comprehensive road test before handover.

Vehicle Compatibility and Requirements

This upgrade supports 2022–2026 Range Rover L460 and Range Rover Sport L461 models fitted with the 3.0-litre Ingenium I6 MHEV diesel in D300 specification. The service also applies to Defender L663 models where JLR produced the D300 and D350 variants on shared hardware[reference:10][reference:11]. Because JLR produced multiple diesel variants across model years and markets, VIN verification is mandatory before purchase. Submit your VIN during checkout, and our technical team will confirm compatibility and the correct factory D350 target calibration for your specific vehicle.

Warranty and Compliance

This upgrade uses genuine JLR factory calibration data and JLR-approved diagnostic protocols. The procedure preserves the vehicle’s OEM software architecture, leaves no physical trace, and remains fully reversible through the pre-programming CCF backup[reference:12]. The calibration retains full dealer diagnostic access and supports future over-the-air software updates[reference:13]. We recommend reviewing your specific warranty terms and discussing the calibration with your authorised JLR dealer before installation. We provide full documentation of the calibration process for your records.

Ordering and Installation

1. Submit your VIN — our team verifies compatibility and identifies the correct D350 factory target calibration for your vehicle.
2. Receive your calibration package — we prepare the JLR factory software and provide installation guidance.
3. Remote or in-person installation — the calibration uploads through the ENET diagnostic port using JLR Pathfinder DoIP standards, typically within a single service session.
4. Post-upgrade verification — we confirm successful calibration, clear fault codes, and provide documentation.

Unlock the D350 performance your D300 already carries. The factory calibration is already inside your vehicle. This upgrade activates it with the precision and reliability that JLR engineering demands.