The Lamborghini Diablo Roadster VT 5.7, produced from April 1996 to September 1999, represented the open-top iteration of Lamborghini’s iconic Diablo. Positioned as the flagship convertible within the Diablo range, the VT 5.7 distinguished itself with its powerful 5.7-liter V12 engine and advanced all-wheel-drive system. It was a statement of performance and luxury, aimed at buyers seeking the ultimate in open-air exotic car experiences. The “VT” designation signified “Viscous Traction,” denoting the all-wheel-drive system, while the “5.7” indicated the engine displacement. This model sat at the pinnacle of the Diablo Roadster lineup, offering the highest performance and most sophisticated technology available at the time.
Technical Specifications
| Brand | Lamborghini |
| Model | Diablo |
| Generation | Diablo Roadster |
| Type (Engine) | VT 5.7 (492 Hp) |
| Start of production | April, 1996 |
| End of production | September, 1999 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Roadster |
| Seats | 2 |
| Doors | 2 |
| Fuel consumption (economy) – urban | 26.1 l/100 km (9 US mpg, 10.8 UK mpg, 3.8 km/l) |
| Fuel consumption (economy) – extra urban | 16.8 l/100 km (14 US mpg, 16.8 UK mpg, 6 km/l) |
| Fuel consumption (economy) – combined | 19.2 l/100 km (12.3 US mpg, 14.7 UK mpg, 5.2 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 60 mph | 4 sec |
| Maximum speed | 322 km/h (200.08 mph) |
| Weight-to-power ratio | 3.3 kg/Hp, 302.8 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 356.9 Nm/tonne |
| Power | 492 Hp @ 7000 rpm |
| Power per litre | 86.2 Hp/l |
| Torque | 580 Nm @ 5200 rpm (427.79 lb.-ft. @ 5200 rpm) |
| Engine layout | Middle, Longitudinal |
| Engine Model/Code | L 522 |
| Engine displacement | 5707 cm3 (348.26 cu. in.) |
| Number of cylinders | 12 |
| Engine configuration | V-engine |
| Cylinder Bore | 87.12 mm (3.43 in.) |
| Piston Stroke | 80.01 mm (3.15 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 14 l (14.79 US qt | 12.32 UK qt) |
| Coolant | 15 l (15.85 US qt | 13.2 UK qt) |
| Kerb Weight | 1625 kg (3582.51 lbs.) |
| Max. weight | 1890 kg (4166.74 lbs.) |
| Max load | 265 kg (584.22 lbs.) |
| Trunk (boot) space – minimum | 150 l (5.3 cu. ft.) |
| Fuel tank capacity | 98 l (25.89 US gal | 21.56 UK gal) |
| Length | 4542 mm (178.82 in.) |
| Width | 2040 mm (80.31 in.) |
| Height | 1133 mm (44.61 in.) |
| Wheelbase | 2649 mm (104.29 in.) |
| Ride height (ground clearance) | 140 mm (5.51 in.) |
| Minimum turning circle (turning diameter) | 13 m (42.65 ft.) |
| 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 | 5 gears, manual transmission |
| Front suspension | Double wishbone, Transverse stabilizer |
| Rear suspension | Double wishbone, Transverse stabilizer |
| Front brakes | Ventilated discs, 325.12×33.02 mm |
| Rear brakes | Ventilated discs, 314.96×27.94 mm |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | Front wheel tires: 235/40 R17Rear wheel tires: 335/35 R17 |
| Wheel rims size | Front wheel rims: 8.5J x 17Rear wheel rims: 13J x 17 |
Powertrain & Engine Architecture
The heart of the Diablo Roadster VT 5.7 is the L522, a 5.7-liter (5707 cc) naturally aspirated V12 engine. This engine builds upon the earlier Diablo V12s, but with increased displacement and refinements to improve power and torque. It features a 60-degree V-angle, four valves per cylinder operated by dual overhead camshafts (DOHC), and multi-port fuel injection. The engine produces 492 horsepower at 7000 rpm and 427.79 lb-ft of torque at 5200 rpm. The engine’s architecture is a testament to Lamborghini’s engineering prowess, prioritizing smooth power delivery and a distinctive exhaust note. The five-speed manual transmission was the only transmission option, delivering power to all four wheels. The all-wheel-drive system utilizes a viscous coupling to distribute torque between the front and rear axles, enhancing traction and stability.
Driving Characteristics
The Diablo Roadster VT 5.7 delivers a thrilling driving experience. Acceleration from 0 to 60 mph takes approximately 4 seconds, and it can achieve a top speed of 200.08 mph. The all-wheel-drive system provides exceptional grip, particularly when exiting corners. Compared to rear-wheel-drive Diablo variants, the VT 5.7 offers increased stability and confidence-inspiring handling. While the manual transmission requires skill to operate smoothly, it provides a direct connection to the engine and allows for precise control. The gear ratios are well-matched to the engine’s powerband, providing strong acceleration in all gears. However, the car’s substantial weight (3582.51 lbs) is noticeable, and it doesn’t possess the agility of more modern supercars.
Equipment & Trim Levels
The Diablo Roadster VT 5.7 was generously equipped, reflecting its status as a high-end exotic car. Standard features included leather upholstery, power windows, power steering, air conditioning, and a premium sound system. The interior featured a driver-focused cockpit with analog gauges and a leather-wrapped steering wheel. Optional extras included upgraded audio systems, custom paint colors, and various interior trim options. The Roadster also featured a manually operated soft top, which could be raised or lowered to enjoy open-air driving. The interior design, while luxurious, prioritized functionality and a connection to the driving experience.
Chassis & Braking
The Diablo Roadster VT 5.7 utilizes a tubular steel chassis, providing a rigid and lightweight foundation. The suspension consists of independent double wishbones with transverse stabilizers at both the front and rear. This setup provides a comfortable ride while maintaining excellent handling characteristics. Braking duties are handled by ventilated disc brakes on all four wheels. The front brakes measure 325.12×33.02 mm, while the rear brakes are 314.96×27.94 mm. The braking system provides ample stopping power, but lacks the advanced features found in more modern performance cars, such as ABS.
Market Reception & Comparison
The Diablo Roadster VT 5.7 was well-received by automotive critics, who praised its performance, handling, and luxurious interior. However, its high price and relatively poor fuel economy (12.3 US mpg combined) were noted drawbacks. Compared to other Diablo variants, the VT 5.7 offered the best combination of performance and all-weather capability. The all-wheel-drive system made it a more practical choice for drivers in regions with inclement weather. Compared to the rear-wheel-drive Diablo, the VT 5.7 was generally considered to be more forgiving and easier to drive at the limit.
Legacy
The Lamborghini Diablo Roadster VT 5.7 remains a highly sought-after collectible car. Its powerful V12 engine, striking design, and limited production numbers have contributed to its enduring appeal. The L522 engine is known for its reliability, provided it is properly maintained. However, maintenance costs can be substantial, due to the car’s complex mechanical systems and the scarcity of parts. Today, the Diablo Roadster VT 5.7 represents a significant chapter in Lamborghini’s history, embodying the brand’s commitment to performance, luxury, and exclusivity. Well-maintained examples command high prices in the used car market, attracting collectors and enthusiasts alike.
