The Land Rover Discovery V 3.0 Si6, produced from 2017 to 2018, represents a significant iteration in the fifth generation of Land Rover’s popular SUV. Positioned as a premium offering within the Discovery V lineup, this variant combined a potent supercharged V6 engine with a sophisticated all-wheel-drive system and an eight-speed automatic transmission, offering a blend of performance, luxury, and off-road capability. It was designed to appeal to buyers seeking a versatile vehicle capable of both family duties and adventurous excursions. The Discovery V series (internally designated as the L550) moved away from the rugged, utilitarian image of previous generations, embracing a more refined and contemporary aesthetic while retaining Land Rover’s core competency in all-terrain performance.
Technical Specifications
| Brand | Land Rover |
| Model | Discovery |
| Generation | Discovery V |
| Type | 3.0 Si6 (340 Hp) 4WD Automatic 7 Seat |
| Start of production | 2017 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 7 |
| Doors | 5 |
| Fuel consumption (urban) | 14.2 l/100 km (16.6 US mpg, 19.9 UK mpg, 7 km/l) |
| Fuel consumption (extra urban) | 9.3 l/100 km (25.3 US mpg, 30.4 UK mpg, 10.8 km/l) |
| Fuel consumption (combined) | 10.9 l/100 km (21.6 US mpg, 25.9 UK mpg, 9.2 km/l) |
| CO2 emissions | 254 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.1 sec |
| Acceleration 0 – 62 mph | 7.1 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 215 km/h (133.59 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 6.3 kg/Hp, 158.3 Hp/tonne |
| Weight-to-torque ratio | 4.8 kg/Nm, 209.5 Nm/tonne |
| Power | 340 Hp @ 6500 rpm |
| Power per litre | 113.5 Hp/l |
| Torque | 450 Nm @ 3500-5000 rpm (331.9 lb.-ft. @ 3500-5000 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | AJ126 |
| Engine displacement | 2995 cm3 (182.77 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 84.5 mm (3.33 in.) |
| Piston Stroke | 89 mm (3.5 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Supercharger, Intercooler |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Kerb Weight | 2148 kg (4735.53 lbs.) |
| Trunk (boot) space – minimum | 258 l (9.11 cu. ft.) |
| Trunk (boot) space – maximum | 2406 l (84.97 cu. ft.) |
| Fuel tank capacity | 89 l (23.51 US gal | 19.58 UK gal) |
| Permitted trailer load with brakes (12%) | 3500 kg (7716.18 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4970 mm (195.67 in.) |
| Width with mirrors folded | 2073 mm (81.61 in.) |
| Width including mirrors | 2220 mm (87.4 in.) |
| Height | 1846 mm (72.68 in.) |
| Wheelbase | 2923 mm (115.08 in.) |
| Front track | 1692 mm (66.61 in.) |
| Rear (Back) track | 1686 mm (66.38 in.) |
| Front overhang | 872 mm (34.33 in.) |
| Rear overhang | 1175 mm (46.26 in.) |
| Ride height (ground clearance) | 220 mm (8.66 in.) |
| Drag coefficient (Cd) | 0.36 |
| Minimum turning circle (turning diameter) | 12.7 m (41.67 ft.) |
| Approach angle | 28.5° |
| Departure angle | 27.0° |
| Ramp-over (brakeover) angle | 22.5° |
| Climb angle | 45° |
| Wading depth | 850 mm (33.46 in.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives permanently the four wheels of the vehicle. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission |
| Front suspension | Independent multi-link suspension, Independent coil spring |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs, 360 mm |
| Rear brakes | Ventilated discs, 350 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 235/65 R19; 255/60 R19; 255/55 R20; 275/45 R21; 285/40 R22 |
| Wheel rims size | 7.5J x 19; 8.5J x 20; 9.5J x 21; 9.5J x 22 |
Powertrain & Engine Architecture
At the heart of the Discovery V 3.0 Si6 lies the AJ126 engine, a 3.0-liter supercharged V6 gasoline engine. This engine is a cornerstone of Jaguar Land Rover’s Ingenium engine family, though the AJ126 predates the fully modular Ingenium designs. It features direct fuel injection and a Roots-type supercharger, delivering a robust 340 horsepower at 6,500 rpm and 450 Nm (331.9 lb-ft) of torque between 3,500 and 5,000 rpm. The supercharger provides immediate throttle response and strong low-end torque, contributing to the vehicle’s effortless acceleration. The engine’s transverse mounting optimizes packaging within the engine bay. The eight-speed automatic transmission, sourced from ZF, is a crucial component of the powertrain. Known for its smooth and quick shifts, it contributes to both performance and fuel efficiency. The transmission features a wide gear ratio spread, allowing for both strong acceleration and relaxed highway cruising.
Driving Characteristics
The 3.0 Si6 variant of the Discovery V offers a noticeably more spirited driving experience compared to the lower-powered four-cylinder options. The supercharged V6 provides ample power for overtaking and merging, and the eight-speed automatic transmission keeps the engine in its optimal power band. While not a sports SUV, the Discovery V 3.0 Si6 feels confident and composed on the road. The all-wheel-drive system provides excellent traction in various conditions, and the air suspension (standard on many trims) delivers a comfortable ride. Compared to the diesel variants, the 3.0 Si6 offers a more refined and responsive engine character, but at the expense of fuel economy. The gear ratios are tuned for a balance of acceleration and efficiency, with lower gears providing quick off-the-line response and higher gears optimized for highway cruising.
Equipment & Trim Levels
The 3.0 Si6 typically came in higher trim levels, such as HSE and HSE Luxury. Standard equipment included leather upholstery, heated front seats, a panoramic sunroof, a premium sound system, and a suite of driver-assistance features like adaptive cruise control and lane departure warning. Optional extras included upgraded leather packages, rear-seat entertainment systems, and advanced off-road packages with features like Terrain Response 2 and an active rear differential. The interior design emphasized luxury and practicality, with a spacious cabin and ample storage compartments. The infotainment system featured a touchscreen display and integrated navigation.
Chassis & Braking
The Discovery V utilizes a lightweight aluminum monocoque chassis, contributing to its relatively low weight for a vehicle of its size. The suspension system consists of independent multi-link suspension at all four corners, providing a comfortable and controlled ride. Air suspension was often included, allowing for adjustable ride height and improved off-road capability. Braking duties are handled by ventilated discs on all four wheels, providing ample stopping power. The front brakes measure 360mm, while the rear brakes are 350mm. An anti-lock braking system (ABS) and electronic stability control (ESC) are standard features, enhancing safety and control.
Market Reception & Comparison
The Discovery V 3.0 Si6 was generally well-received by automotive critics, who praised its powerful engine, comfortable ride, and luxurious interior. However, some reviewers noted that the fuel economy was relatively poor compared to the diesel alternatives. Compared to the four-cylinder models, the 3.0 Si6 offered a significant performance upgrade, but at a higher price point. Against competitors like the Audi Q7 and BMW X5, the Discovery V 3.0 Si6 offered a unique blend of luxury, off-road capability, and practicality.
Legacy
The AJ126 engine, while not without its quirks, has proven to be a relatively reliable powertrain when properly maintained. Common issues include occasional oil leaks and potential problems with the supercharger’s bearings. The eight-speed ZF transmission is known for its durability and smooth operation. In the used car market, the Discovery V 3.0 Si6 holds its value reasonably well, particularly well-maintained examples with a full service history. It remains a popular choice for buyers seeking a versatile and capable luxury SUV with a strong engine and a comfortable ride.
