1991-1994 Jaguar XJSc Convertible 4.0 (222 Hp)

The Jaguar XJSC Convertible 4.0, produced between 1991 and 1994, represents a refined iteration of Jaguar’s long-running XJ-S grand tourer. This open-top variant, distinguished by its power-operated soft top, aimed to combine British luxury with open-air driving pleasure. It sat towards the upper end of the XJ-S lineup, offering a significant performance upgrade over the earlier 3.6-liter models while remaining more accessible than the later, supercharged versions. The XJSC, internally designated as Project Landaulet during development, was intended to replace the E-Type, but its protracted development and initial styling criticisms meant it coexisted with the E-Type for a period. The 4.0-liter version specifically addressed some of the earlier criticisms regarding performance, offering a more spirited driving experience.

Technical Specifications

Powertrain & Engine Architecture

The heart of the XJSC 4.0 is Jaguar’s renowned 4.0-liter V12 engine. This engine, designated the AJ6S, represented a significant evolution of the earlier V12s used in the XJ-S. It featured a 60-degree V-angle, aluminum alloy cylinder heads and block, and a single overhead camshaft per bank operating four valves per cylinder. Fuel injection was handled by a Bosch Motronic engine management system, providing precise control over fuel delivery and ignition timing. The 4.0-liter engine produced 222 horsepower at 5,500 rpm and 290 lb-ft of torque at 3,800 rpm. This represented a substantial increase in power compared to the earlier 3.6-liter inline-six engines. The engine’s smooth power delivery was a hallmark of Jaguar V12s.

The XJSC 4.0 was exclusively paired with a four-speed automatic transmission manufactured by ZF, specifically the 4HP22 model. This transmission was known for its smoothness and reliability. While not offering the driver engagement of a manual gearbox, the automatic transmission suited the XJSC’s grand touring character, providing effortless cruising. The transmission featured electronic control, further enhancing its refinement. The gear ratios were optimized for both acceleration and highway cruising, providing a balance between performance and fuel efficiency.

Driving Characteristics

The XJSC 4.0 offered a distinctly grand touring experience. The 4.0-liter V12 provided ample power for comfortable and confident highway cruising, as well as brisk acceleration when needed. The automatic transmission contributed to the car’s ease of use, making it a relaxed and enjoyable vehicle to drive. However, it wasn’t a sports car in the modern sense. The XJSC’s considerable weight and relatively soft suspension tuning prioritized comfort over razor-sharp handling. Steering was power-assisted, providing light effort but lacking significant feedback. The car felt planted and stable at high speeds, but it wasn’t particularly agile in tight corners. Compared to the earlier 3.6-liter XJ-S, the 4.0-liter version felt noticeably more responsive and capable, particularly when overtaking or climbing hills. It lacked the raw performance of the later supercharged models, but offered a more balanced and accessible driving experience.

Equipment & Trim Levels

The XJSC 4.0 Convertible was a luxury vehicle, and came well-equipped as standard. Interior appointments included Connolly leather upholstery, burled walnut wood trim, and power-adjustable front seats. Standard features also included air conditioning, power windows, power door locks, and a premium sound system. The convertible top was fully automatic, raising and lowering with the touch of a button. Optional extras included a heated windshield, a self-leveling suspension system, and upgraded audio systems. Trim levels were relatively limited, with most variations stemming from optional equipment choices. The XJSC 4.0 generally represented a higher level of specification than the earlier 3.6-liter models, reflecting its position as a more premium offering.

Chassis & Braking

The XJSC Convertible 4.0 utilized a monocoque chassis construction, providing a rigid and lightweight platform. Suspension was independent on all four wheels, employing double wishbones at the front and a semi-trailing arm setup at the rear. Anti-roll bars were fitted to both the front and rear axles to reduce body roll during cornering. Braking was provided by four-wheel disc brakes, although rear discs were smaller in diameter than the front. Anti-lock braking system (ABS) was standard, enhancing safety and control. The suspension was tuned for comfort, prioritizing a smooth ride over aggressive handling. The steering was power-assisted, providing light effort but lacking significant feedback.

Market Reception & Comparison

The XJSC 4.0 Convertible was generally well-received by automotive critics. The increased power of the 4.0-liter engine was praised, addressing a common criticism of the earlier XJ-S models. The car’s luxurious interior and comfortable ride were also highlighted. However, some critics still found the styling somewhat dated, and the car’s weight and size limited its agility. Compared to the 3.6-liter XJ-S, the 4.0-liter version offered a significant performance improvement, making it a more desirable option for buyers seeking a more spirited driving experience. Compared to the later supercharged XJ-S models, the 4.0-liter version was more affordable and accessible, but lacked the ultimate performance of the forced-induction variants. Fuel economy was typical for a V12 engine of the era, averaging around 14-16 mpg in mixed driving.

Legacy

The Jaguar XJSC 4.0 Convertible remains a desirable classic car today. The 4.0-liter V12 engine is generally considered to be a reliable unit, although regular maintenance is essential. Common issues include oil leaks and electrical gremlins, typical of British cars of this era. The ZF 4HP22 automatic transmission is also known for its durability, provided it has been properly serviced. The XJSC 4.0 Convertible offers a unique combination of British luxury, V12 power, and open-air driving pleasure. Values have been steadily increasing in recent years, reflecting the car’s growing popularity among collectors and enthusiasts. Finding well-maintained examples can be challenging, but the XJSC 4.0 Convertible remains a rewarding and enjoyable classic car to own and drive.