The Infiniti Q70, specifically the facelifted model produced from 2014 to 2018, represented Infiniti’s offering in the mid-size luxury sedan segment. This iteration, distinguished by revised styling and updated technology, aimed to compete with established European and domestic rivals like the BMW 5 Series, Mercedes-Benz E-Class, and Cadillac CTS. Among the engine options available, the 5.6-liter V8 paired with an automatic transmission and all-wheel drive (AWD) represented the top-tier performance variant. This configuration positioned the Q70 as a powerful and refined grand tourer, prioritizing comfort and effortless acceleration over outright sportiness. It was the flagship engine choice for those seeking a premium experience within the Q70 lineup.
Technical Specifications
| Brand | Infiniti |
| Model | Q70 |
| Generation | Q70 (facelift 2014) |
| Type (Engine) | 5.6 V8 (420 Hp) AWD Automatic |
| Start of production | 2014 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 13.1 l/100 km (18 US mpg, 21.6 UK mpg, 7.6 km/l) |
| Fuel consumption (extra urban) | 10.2 l/100 km (23.1 US mpg, 27.7 UK mpg, 9.8 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 4.6 kg/Hp, 218.4 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 293.8 Nm/tonne |
| Power | 420 Hp @ 6000 rpm |
| Power per litre | 75.6 Hp/l |
| Torque | 565 Nm @ 4400 rpm (416.72 lb.-ft. @ 4400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | VK56VD |
| Engine displacement | 5552 cm3 (338.8 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 98 mm (3.86 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 11.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC, VVEL |
| Engine oil capacity | 6.1 l (6.45 US qt | 5.37 UK qt) |
| Coolant capacity | 10.9 l (11.52 US qt | 9.59 UK qt) |
| Kerb Weight | 1923 kg (4239.49 lbs.) |
| Trunk (boot) space | 422 l (14.9 cu. ft.) |
| Fuel tank capacity | 76 l (20.08 US gal | 16.72 UK gal) |
| Length | 4981 mm (196.1 in.) |
| Width | 1844 mm (72.6 in.) |
| Height | 1514 mm (59.61 in.) |
| Wheelbase | 2901 mm (114.21 in.) |
| Front track | 1575 mm (62.01 in.) |
| Rear track | 1570 mm (61.81 in.) |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle | 11.4 m (37.4 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 7 |
| Gearbox type | Automatic transmission ASC |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/50 R18 |
| Wheel rims size | 8J x 18 |
Powertrain & Engine Architecture
The heart of this Q70 variant is the VK56VD 5.6-liter naturally aspirated V8 engine. This engine, a member of Nissan’s VK engine family, is known for its smooth power delivery and robust construction. It features a 60-degree V-angle, contributing to a relatively compact engine bay footprint. The VK56VD utilizes direct fuel injection, enhancing both power and fuel efficiency. Variable Valve Event and Lift (VVEL) technology is employed to optimize valve timing and lift based on driving conditions, further improving performance and responsiveness. The engine produces 420 horsepower at 6000 rpm and 416.72 lb-ft of torque at 4400 rpm. This power is channeled through a seven-speed automatic transmission (ASC) to all four wheels via Infiniti’s Intelligent All-Wheel Drive system. The AWD system prioritizes rear-wheel drive under normal conditions, shifting power to the front wheels as needed for enhanced traction.
Driving Characteristics
The Q70 5.6L AWD delivers a driving experience focused on comfort and effortless acceleration. The large displacement V8 provides ample torque throughout the rev range, making overtaking and merging onto highways a breeze. While not a sports sedan in the vein of some European competitors, the Q70 offers a composed and stable ride. The seven-speed automatic transmission is generally smooth and responsive, although it may not offer the same level of engagement as a dual-clutch transmission. Compared to the Q70 models equipped with the 3.7-liter V6, the V8 provides a significant performance advantage. The V6 models, while more fuel-efficient, lacked the sheer power and refinement of the 5.6-liter engine. The AWD system provides enhanced grip in inclement weather, making it a practical choice for regions with harsh winters.
Equipment & Trim Levels
The 5.6L AWD Q70 typically came well-equipped with standard features including leather upholstery, heated and ventilated front seats, a premium audio system (often Bose), a navigation system, and a suite of safety technologies. Available options included a rear-seat entertainment system, advanced climate control, and various cosmetic enhancements. The trim level often included unique exterior accents, such as chrome detailing and specific wheel designs. The interior typically featured wood trim and a generally luxurious ambiance. The focus was on providing a comfortable and refined cabin experience.
Chassis & Braking
The Q70 utilizes a double wishbone front suspension and an independent multi-link rear suspension, providing a comfortable and controlled ride. Stabilizer bars are fitted to both axles to reduce body roll during cornering. The braking system consists of ventilated discs at all four corners, providing ample stopping power. Anti-lock brakes (ABS) and electronic stability control are standard features. The steering is electrically assisted, offering a light and precise feel. The chassis is tuned for comfort rather than outright sportiness, prioritizing a smooth and quiet ride over sharp handling.
Market Reception & Comparison
Critics generally praised the Q70 5.6L AWD for its powerful engine, comfortable ride, and luxurious interior. However, some reviewers noted that the styling was somewhat conservative compared to its European rivals. Fuel economy was also a concern, given the engine’s large displacement. Compared to the V6-powered Q70 models, the V8 offered a significant performance upgrade but came at a higher price point and with reduced fuel efficiency. Reliability was generally considered good, although maintenance costs for the V8 engine were higher than for the V6.
Legacy
The Infiniti Q70 5.6L AWD remains a compelling option in the used luxury sedan market. The VK56VD engine is known for its durability, and with proper maintenance, it can provide many years of reliable service. While newer luxury sedans offer more advanced technology and features, the Q70 5.6L AWD continues to appeal to buyers who prioritize a comfortable ride, powerful engine, and a relatively affordable price point. Its blend of performance, luxury, and reliability has ensured its continued presence on the roads today.
