The Dodge Viper VX SRT 8.4i V10 20V (649 Hp) represents the final iteration of the iconic Viper sports car, produced from 2013 to 2017. This generation, internally designated as the VX, marked a return for the Viper after a brief hiatus, and aimed to recapture the raw, visceral driving experience that defined the model while incorporating modern technology and refinement. The VX was offered exclusively as a coupe and a convertible, both powered by a hand-built, naturally aspirated 8.4-liter V10 engine. This variant, with its substantial 649 horsepower output, positioned itself as the flagship performance model within the revived Viper lineup, catering to enthusiasts seeking uncompromising power and handling.
Technical Specifications
| Brand | Dodge |
| Model | Viper |
| Generation | Viper VX |
| Type (Engine) | SRT 8.4i V10 20V (649 Hp) |
| Start of production | 2013 |
| End of production | 2017 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe, Liftback |
| Seats | 2 |
| Doors | 3 |
| Fuel consumption (urban) | 19.6 l/100 km (12 US mpg, 14.4 UK mpg, 5.1 km/l) |
| Fuel consumption (extra urban) | 12.4 l/100 km (19 US mpg, 22.8 UK mpg, 8.1 km/l) |
| Fuel consumption (combined) | 16.8 l/100 km (14 US mpg, 16.8 UK mpg, 6 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 3.9 sec |
| Acceleration 0 – 62 mph | 3.9 sec |
| Acceleration 0 – 60 mph | 3.7 sec |
| Maximum speed | 325 km/h (201.95 mph) |
| Weight-to-power ratio | 2.3 kg/Hp, 433.8 Hp/tonne |
| Weight-to-torque ratio | 1.8 kg/Nm, 544.1 Nm/tonne |
| Power | 649 Hp @ 6200 rpm |
| Power per litre | 77.4 Hp/l |
| Torque | 814 Nm @ 5000 rpm (600.38 lb.-ft. @ 5000 rpm) |
| Maximum engine speed | 6400 rpm |
| Engine layout | Front, Longitudinal |
| Engine displacement | 8382 cm3 (511.5 cu. in.) |
| Number of cylinders | 10 |
| Engine configuration | V-engine |
| Cylinder Bore | 103 mm (4.06 in.) |
| Piston Stroke | 100.6 mm (3.96 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV, VVT |
| Engine oil capacity | 10.4 l (10.99 US qt | 9.15 UK qt) |
| Coolant | 15 l (15.85 US qt | 13.2 UK qt) |
| Kerb Weight | 1496-1521 kg (3298.12 – 3353.23 lbs.) |
| Trunk (boot) space – maximum | 114 l (4.03 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4463 mm (175.71 in.) |
| Width | 1941 mm (76.42 in.) |
| Height | 1246 mm (49.06 in.) |
| Wheelbase | 2510 mm (98.82 in.) |
| Front track | 1598 mm (62.91 in.) |
| Rear (Back) track | 1550 mm (61.02 in.) |
| Ride height (ground clearance) | 127 mm (5 in.) |
| Drag coefficient (Cd) | 0.369 |
| Minimum turning circle (turning diameter) | 12.34 m (40.49 ft.) |
| Approach angle | 10.73° |
| Departure angle | 16.15° |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs, 355.6 mm |
| Rear brakes | Ventilated discs, 355.6 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | Front wheel tires: 295/30 ZR18 Rear wheel tires: 355/30 ZR19 |
| Wheel rims size | Front wheel rims: 10.5J x 18 Rear wheel rims: 13J x 19 |
Powertrain & Engine Architecture
The heart of the Viper VX SRT is its 8.4-liter (511 cubic inch) V10 engine, designated as the 8.4L V10. This engine is a significant departure from the earlier Viper powerplants, featuring aluminum block construction, revised cylinder heads, and a strengthened crankshaft. The engine utilizes a multi-port fuel injection system and overhead valve (OHV) valvetrain with variable valve timing (VVT) to optimize performance and efficiency. The 649 horsepower and 600 lb-ft of torque are delivered through a robust six-speed manual transmission, the only transmission option available for this model. The engine’s longitudinal mounting and rear-wheel-drive configuration contribute to the car’s balanced handling characteristics. The engine oil capacity is 10.4 liters, and requires a specific oil specification for optimal performance and longevity.
Driving Characteristics
The Viper VX SRT 8.4i delivers a raw and engaging driving experience. The substantial torque output, readily available across a broad RPM range, provides exhilarating acceleration. The manual transmission, while demanding, offers precise control and a direct connection to the powertrain. Compared to hypothetical lower-powered Vipers, the 649 hp variant offers a significantly more intense experience, requiring greater driver skill and attention. The gear ratios are tuned for maximizing acceleration, with a focus on delivering power to the rear wheels. While not designed for fuel efficiency, the Viper’s performance capabilities are its primary focus. The car’s weight, while substantial, is well-distributed, contributing to its impressive handling balance.
Equipment & Trim Levels
The Viper VX SRT 8.4i came standard with a comprehensive suite of performance-oriented features. Interior appointments included bolstered leather seats, a leather-wrapped steering wheel, and a premium audio system. Standard equipment also included a performance-tuned suspension, Brembo brakes, and a sophisticated stability control system. Optional extras included upgraded interior trim materials, a two-mode exhaust system, and various exterior customization options. The interior design prioritized functionality and driver focus, with minimal distractions. The VX trim represented the highest level of equipment available for the fifth-generation Viper.
Chassis & Braking
The Viper VX SRT utilizes an aluminum chassis designed for exceptional rigidity and lightweight construction. The suspension system features independent multi-link suspension at both the front and rear, optimized for handling and ride comfort. Braking duties are handled by large, ventilated disc brakes with Brembo calipers, providing exceptional stopping power. The ABS (Anti-lock braking system) is standard. The car’s wide track and low center of gravity contribute to its stability and cornering ability. The tires, sized 295/30 ZR18 at the front and 355/30 ZR19 at the rear, provide ample grip.
Market Reception & Comparison
The Viper VX SRT 8.4i was generally well-received by automotive critics, who praised its powerful engine, engaging driving dynamics, and striking design. However, its high price and uncompromising nature limited its appeal to a niche market. Compared to other high-performance sports cars of the era, such as the Chevrolet Corvette Z06 and the Porsche 911 GT3, the Viper offered a more visceral and raw driving experience, but with less refinement and practicality. Fuel economy was predictably poor, reflecting the car’s high-output engine and focus on performance. Reliability was also a concern for some owners, with reports of occasional mechanical issues.
Legacy
The Dodge Viper VX SRT 8.4i represents the culmination of the Viper’s development, and the final chapter in the model’s history. While production numbers were relatively low, the car has become a sought-after collectible among enthusiasts. The 8.4-liter V10 engine is widely regarded as one of the most impressive American-made powerplants of all time. The Viper’s legacy as a no-compromise sports car continues to endure, and the VX SRT stands as a testament to the model’s enduring appeal. On the used car market, well-maintained examples command premium prices, reflecting their rarity and desirability. The powertrain, while requiring diligent maintenance, has proven to be relatively durable when properly cared for.
