The Infiniti FX II 50, produced between 2008 and 2012, represents the second generation of Infiniti’s mid-size luxury crossover SUV. This variant, equipped with the VK50VE 5.0-liter V8 engine producing 390 horsepower and paired with a 7-speed automatic transmission and ATTESA E-TS all-wheel drive, was positioned as the performance flagship of the FX lineup. It aimed to blend the practicality of an SUV with the driving dynamics of a sports car, appealing to buyers seeking a distinctive and powerful luxury vehicle. The FX II competed with vehicles like the BMW X5, Porsche Cayenne, and Acura MDX, offering a unique combination of style, performance, and technology.
Technical Specifications
| Brand | Infiniti |
| Model | FX |
| Generation | FX II |
| Type (Engine) | 50 V8 (390 Hp) ATTESA E-TS AWD Automatic |
| Start of production | 2008 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Crossover |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (economy) – urban (NEDC) | 18.9 l/100 km (12.4 US mpg, 14.9 UK mpg, 5.3 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 9.8 l/100 km (24 US mpg, 28.8 UK mpg, 10.2 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 13.1 l/100 km (18 US mpg, 21.6 UK mpg, 7.6 km/l) |
| CO2 emissions (NEDC) | 307 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.8 sec |
| Acceleration 0 – 62 mph | 5.8 sec |
| Acceleration 0 – 60 mph | 5.5 sec |
| Maximum speed | 250 km/h (155.34 mph) – Electronically limited |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 5.3 kg/Hp, 188 Hp/tonne |
| Weight-to-torque ratio | 4.2 kg/Nm, 241 Nm/tonne |
| Power | 390 Hp @ 6500 rpm |
| Power per litre | 77.6 Hp/l |
| Torque | 500 Nm @ 4400 rpm (368.78 lb.-ft. @ 4400 rpm) |
| Maximum engine speed | 6800 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | VK50VE |
| Engine displacement | 5026 cm3 (306.71 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 95.5 mm (3.76 in.) |
| Piston Stroke | 87.7 mm (3.45 in.) |
| Compression ratio | 10.9:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC, VVEL |
| Engine oil capacity | 6.7 l (7.08 US qt | 5.9 UK qt) |
| Coolant | 11 l (11.62 US qt | 9.68 UK qt) |
| Kerb Weight | 2075 kg (4574.59 lbs.) |
| Max. weight | 2615 kg (5765.09 lbs.) |
| Max load | 540 kg (1190.5 lbs.) |
| Trunk (boot) space – minimum | 702 l (24.79 cu. ft.) |
| Trunk (boot) space – maximum | 1756 l (62.01 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Max. roof load | 45 kg (99.21 lbs.) |
| Permitted trailer load with brakes (12%) | 1588 kg (3500.94 lbs.) |
| Permitted trailer load without brakes | 454 kg (1000.9 lbs.) |
| Permitted towbar download | 159 kg (350.53 lbs.) |
| Length | 4860 mm (191.34 in.) |
| Width | 1925 mm (75.79 in.) |
| Height | 1680 mm (66.14 in.) |
| Wheelbase | 2885 mm (113.58 in.) |
| Front track | 1635 mm (64.37 in.) |
| Rear (Back) track | 1640 mm (64.57 in.) |
| Ride height (ground clearance) | 187 mm (7.36 in.) |
| Drag coefficient (Cd) | 0.36 |
| Minimum turning circle (turning diameter) | 11.2 m (36.75 ft.) |
| Approach angle | 28.8° |
| Departure angle | 20.9° |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels permanently, and the front wheels are driven through an electrically or mechanically operated clutch if necessary. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 7 gears, automatic transmission |
| Front suspension | Double wishbone, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs, 355×33 mm |
| Rear brakes | Ventilated discs, 350×20 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 265/45 R21 |
| Wheel rims size | 9.5J x 21 |
Powertrain & Engine Architecture
The heart of the FX II 50 is the VK50VE 5.0-liter V8 engine. This naturally aspirated engine utilizes a 60-degree V-angle and features dual overhead camshafts (DOHC) with variable valve event and lift (VVEL) technology. VVEL allows for precise control of valve timing and lift, optimizing engine performance and efficiency across the rev range. The engine employs multi-port fuel injection and boasts a compression ratio of 10.9:1. The 7-speed automatic transmission, sourced from Jatco (a Nissan subsidiary), provides smooth and responsive shifting. The ATTESA E-TS (Advanced Total Traction Engineering System for All-Terrain) all-wheel-drive system is a key component, proactively distributing torque between the front and rear axles based on road conditions and driver input. Typically, the system operates in a rear-wheel-drive configuration for improved fuel efficiency and a more engaging driving experience, seamlessly engaging the front wheels when traction is needed.
Driving Characteristics
The FX II 50 delivers strong acceleration, achieving 0-60 mph in approximately 5.5 seconds. The 500 Nm (368.78 lb-ft) of torque, available at 4400 rpm, provides ample power for effortless overtaking and towing. The 7-speed automatic transmission is well-tuned, offering quick and precise shifts. Compared to the 3.5-liter V6 version of the FX, the 50 V8 offers a significantly more powerful and refined driving experience. While the V6 prioritized fuel economy, the V8 focused on performance. The automatic transmission, while convenient, doesn’t offer the same level of driver engagement as the available manual transmission in some markets. The ATTESA E-TS system provides excellent stability and traction in various conditions, enhancing confidence during spirited driving and inclement weather.
Equipment & Trim Levels
The FX II 50 typically came standard with a high level of equipment, including leather upholstery, power-adjustable heated front seats, a premium Bose audio system, a navigation system, and a sunroof. Optional extras included ventilated front seats, adaptive cruise control, lane departure warning, and a rear-seat entertainment system. Interior trim options included woodgrain accents and metallic finishes. The FX 50 was generally offered in a single, well-equipped trim level, with options packages available to further enhance the luxury and technology features.
Chassis & Braking
The FX II rides on a robust chassis featuring a double wishbone front suspension and an independent multi-link rear suspension. Stabilizer bars are fitted to both axles to minimize body roll during cornering. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Front brakes measure 355x33mm, while rear brakes are 350x20mm. ABS (Anti-lock Braking System) is standard. The suspension tuning is geared towards a balance between comfort and handling, providing a relatively compliant ride while maintaining good control in corners.
Market Reception & Comparison
The Infiniti FX II 50 was generally well-received by automotive critics, who praised its powerful engine, luxurious interior, and distinctive styling. However, its fuel economy was often criticized as being relatively poor compared to its competitors. Compared to the FX 35 (3.5L V6), the FX 50 offered a substantial performance upgrade but came at a higher price point and with increased running costs. Reliability was generally good, although some owners reported issues with the cooling system and electronic components.
Legacy
The Infiniti FX II 50 remains a desirable vehicle in the used car market, particularly for those seeking a unique and powerful luxury crossover. The VK50VE V8 engine is known for its durability and smooth power delivery, although regular maintenance is essential. While fuel economy is a concern, the FX 50’s combination of performance, luxury, and distinctive styling continues to appeal to enthusiasts. Parts availability is generally good, but specialized components may require sourcing from Infiniti dealerships or online retailers. The FX II 50 represents a bold and ambitious attempt by Infiniti to challenge the established players in the luxury crossover segment.
