1978 Porsche 928 Dimensions, Size & Specs

With side mirrors opened, the Porsche 928's width extends to 2028 mm (79.8 inches). This wider profile should be taken into consideration when parking in tight spaces or standard garages, as the mirrors increase the car's overall width by approximately 138-192 mm (5.4 to 7.6 inches) compared to its closed width. Drivers should be cautious when maneuvering in narrow spots to avoid mirror damage.

The Porsche 928's curb weight varies from approximately 1450 kg to 1650 kg (3197 to 3638 lbs) depending on the specific model and equipment. This weight range supports the car’s front-engine V8 layout, contributing to a balanced driving experience characterized by solid road grip and stable handling. While heavier than some contemporary sports cars, the refined chassis and suspension ensure a smooth and engaging drive.

The Porsche 928's height ranges from 1280 mm to 1313 mm (50.4 to 51.7 inches), with a ride height or ground clearance of about 115 to 125 mm (4.5 to 4.9 inches). This relatively low profile enhances aerodynamic performance and handling agility, particularly on smooth roads and curves. However, the low ground clearance means the car is less suitable for rough terrain, speed bumps, or uneven surfaces, requiring attentive driving on such conditions.

The Porsche 928 offers a luggage capacity of 200 liters (7.1 cubic feet) under normal conditions, which can be doubled to 400 liters (14.1 cubic feet) when the rear seats are folded down. This generous storage space is quite practical for a sports coupe, allowing owners to carry luggage or larger items conveniently, making it suitable for longer trips or weekend getaways without compromising too much on passenger space.

Yes, the Porsche 928 generally fits into a standard single-car family garage. The typical garage width is about 2400 to 3000 mm (94.5 to 118 inches), which accommodates the car's width of 1836 to 1890 mm (72.3 to 74.4 inches) and even with mirrors extended to 2028 mm (79.8 inches), it fits comfortably. The length of up to 4523 mm (178 inches) is also within the typical garage length range, usually above 5000 mm (197 inches), allowing sufficient room for parking and opening doors with normal care.

The Porsche 928 was a radical departure from Porsche's typical rear-engine, smaller sports cars like the 911. Compared to predecessors, the 928 is larger across almost all dimensions—for example, the 911 of that era was notably shorter and narrower. The 928’s increased length (up to 4523 mm), width (up to 1890 mm), and weight (up to 1650 kg) provided more interior comfort, space, and a grand touring character. Compared to similar GT coupes in the late 1970s and 1980s, like the Jaguar XJ-S or Mercedes-Benz SEC models, the 928 was competitive or slightly more compact, emphasizing performance and luxury in a refined package.

The Porsche 928 came with a range of rim sizes, including 7J x 16, 7.5J x 16, 8J x 16, 9J x 17, and 7.5J x 17, paired with tire sizes such as 225/60 VR16, 225/50 R16, 245/45 ZR16, 255/40 ZR17, and 225/45 ZR17. These large wheels and wide tires improved road grip and handling precision, enhancing the car’s cornering stability and braking performance. The staggered fitment on some models, with wider tires at the rear, further supported balanced traction and sporty driving characteristics.

The Porsche 928 has a roof load capacity ranging between 35 kg and 75 kg (77 to 165 lbs), a limitation set due to its sporty and relatively low roof structure. While it is possible to fit roof racks or carriers, they must be lightweight and securely mounted to avoid damage or unwanted noise. Owners should adhere strictly to this load limit to maintain vehicle safety, structural integrity, and prevent adverse effects on aerodynamics and fuel efficiency.

The Porsche 928 was produced from 1977 until 1995, spanning an 18-year production period. Over its lifespan, the 928 evolved through various updates including the introduction of improved engine variants, transmission options, and technical enhancements like the Weissach package and reinforced chassis. The car matured from its initial broad-shouldered design to a more refined luxury GT coupe, maintaining Porsche’s hallmark performance while increasing comfort, safety, and usability.