The Infiniti Q70, particularly the facelifted version introduced in 2014, represented Infiniti’s offering in the mid-size luxury sedan segment. Produced from 2014 through 2018, this generation aimed to blend performance, luxury, and technology. Among the engine options available, the 5.6-liter V8 paired with a seven-speed automatic transmission stands out as the flagship powertrain, delivering a substantial power output and a more traditional luxury experience. This variant occupied the top tier of the Q70 lineup, positioned above the 3.7-liter V6 models and catering to buyers prioritizing power and refinement.
Technical Specifications
| Brand | Infiniti |
| Model | Q70 |
| Generation | Q70 (facelift 2014) |
| Type (Engine) | 5.6 V8 (420 Hp) Automatic |
| Start of production | 2014 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 14.7 l/100 km (16 US mpg, 19.2 UK mpg, 6.8 km/l) |
| Fuel consumption (extra urban) | 9.8 l/100 km (24 US mpg, 28.8 UK mpg, 10.2 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 4.4 kg/Hp, 229 Hp/tonne |
| Weight-to-torque ratio | 3.2 kg/Nm, 308.1 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 l (6.34 US qt | 5.28 UK qt) |
| Coolant capacity | 10.9 l (11.52 US qt | 9.59 UK qt) |
| Kerb Weight | 1834 kg (4043.28 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 | 1501 mm (59.09 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 | 11.2 m (36.75 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| 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, features a 90-degree V-angle and utilizes aluminum alloy construction for the block and cylinder heads. Direct injection is employed to enhance fuel efficiency and power output, while Variable Valve Event and Lift (VVEL) technology optimizes valve timing and lift for improved performance across the rev range. 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 (designated ASC), known for its smooth shifts and responsive operation. The transmission is electronically controlled and features adaptive shift logic, adjusting shift points based on driving conditions and driver input.
Driving Characteristics
The Q70 5.6 V8 delivers a distinctly different driving experience compared to the V6 models. The substantial torque output provides effortless acceleration in most situations, making highway merging and overtaking maneuvers feel relaxed and confident. While not a sports sedan in the truest sense, the V8 offers a level of performance that is engaging and satisfying. The seven-speed automatic transmission contributes to this experience, providing quick and smooth gear changes. Compared to a manual transmission, the automatic prioritizes comfort and ease of use, but may feel slightly less connected to the engine. The rear-wheel-drive configuration contributes to a balanced feel, although it doesn’t offer the all-weather capability of an all-wheel-drive system.
Equipment & Trim Levels
The 5.6 V8 Q70 typically came well-equipped, reflecting its position as the premium trim level. Standard features often included leather upholstery, heated and ventilated front seats, a premium audio system (often Bose branded), a navigation system, and a suite of driver-assistance technologies such as lane departure warning and blind-spot monitoring. Optional extras could include a rear-seat entertainment system, adaptive cruise control, and semi-aniline leather. Interior trim options typically included wood or aluminum accents, allowing buyers to personalize the cabin to their preferences.
Chassis & Braking
The Q70’s chassis features a double wishbone front suspension and an independent multi-link rear suspension, both designed to provide a comfortable ride and controlled handling. Stabilizer bars are fitted to both axles to reduce body roll during cornering. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) is standard, enhancing safety during emergency braking situations. The steering system utilizes an electric power steering rack and pinion, offering precise and responsive steering feel.
Market Reception & Comparison
Critics generally praised the Q70 5.6 V8 for its powerful engine, comfortable ride, and luxurious interior. However, some reviewers noted that the car’s styling was becoming dated compared to newer competitors. Fuel economy was also a point of concern, with the V8 engine consuming significantly more fuel than the V6 options. Compared to rivals like the BMW 5 Series and Mercedes-Benz E-Class, the Q70 offered a different character – prioritizing comfort and a more relaxed driving experience over outright sportiness. The V6 models offered better fuel economy and a lower price point, appealing to a broader range of buyers.
Legacy
The Infiniti Q70 5.6 V8, while not a high-volume seller, has developed a following among enthusiasts who appreciate its robust powertrain and luxurious appointments. The VK56VD engine is known for its reliability when properly maintained, although preventative maintenance, such as regular oil changes and timing chain inspections, is crucial. On the used car market, these Q70s represent a relatively affordable entry point into the world of V8-powered luxury sedans. Their long-term value is influenced by mileage, condition, and maintenance history, but they continue to offer a compelling combination of performance, comfort, and value.
