The BMW 732i, produced between 1983 and 1986, was a significant iteration of the E23 7 Series, representing a mid-cycle refresh of BMW’s flagship sedan. This model occupied a middle ground within the 7 Series lineup, positioned above the 728i and below the more powerful 745i and later, the 750iL. The facelifted E23, introduced in 1983, brought subtle but important changes to the exterior styling, interior appointments, and mechanical components, solidifying the 7 Series’ reputation as a technologically advanced and luxurious automobile. The 732i specifically aimed to balance performance and fuel efficiency, appealing to buyers who desired a refined driving experience without the higher running costs associated with the larger-displacement engines.
Technical Specifications
| Brand | BMW |
| Model | 7 Series |
| Generation | 7 Series (E23, facelift 1983) |
| Type (Engine) | 732i (197 Hp) |
| Start of production | 1983 |
| End of production | 1986 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 16.8 l/100 km (14 US mpg, 16.8 UK mpg, 6 km/l) |
| Fuel consumption (economy) – extra urban | 8.4 l/100 km (28 US mpg, 33.6 UK mpg, 11.9 km/l) |
| Fuel consumption (economy) – combined | 11.8 l/100 km (19.9 US mpg, 23.9 UK mpg, 8.5 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.6 sec |
| Acceleration 0 – 62 mph | 8.6 sec |
| Acceleration 0 – 60 mph | 8.2 sec |
| Maximum speed | 208 km/h (129.25 mph) |
| Weight-to-power ratio | 7.6 kg/Hp, 131.3 Hp/tonne |
| Weight-to-torque ratio | 5.3 kg/Nm, 190 Nm/tonne |
| Power | 197 Hp @ 5500 rpm |
| Power per litre | 61.4 Hp/l |
| Torque | 285 Nm @ 4300 rpm (210.21 lb.-ft. @ 4300 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M30B32 |
| Engine displacement | 3210 cm3 (195.89 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 89 mm (3.5 in.) |
| Piston Stroke | 86 mm (3.39 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 5.75 l (6.08 US qt, 5.06 UK qt) |
| Coolant | 12 l (12.68 US qt, 10.56 UK qt) |
| Kerb Weight | 1500 kg (3306.93 lbs.) |
| Max. weight | 2010 kg (4431.29 lbs.) |
| Max load | 510 kg (1124.36 lbs.) |
| Trunk (boot) space – minimum | 480 l (16.95 cu. ft.) |
| Fuel tank capacity | 100 l (26.42 US gal, 22 UK gal) |
| Length | 4860 mm (191.34 in.) |
| Width | 1800 mm (70.87 in.) |
| Height | 1430 mm (56.3 in.) |
| Wheelbase | 2795 mm (110.04 in.) |
| Front track | 1502 mm (59.13 in.) |
| Rear (Back) track | 1524 mm (60 in.) |
| Drag coefficient (Cd) | 0.40 |
| Minimum turning circle | 11.6 m (38.06 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 5 gears, manual transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent coil spring |
| Front brakes | Disc |
| Rear brakes | Drum |
| Tires size | 205/70 R 14 |
| Wheel rims size | 14 |
Powertrain & Engine Architecture
The heart of the 732i was the M30B32 engine, a 3.2-liter inline-six cylinder powerplant. This engine was a further development of the M30 family, known for its smoothness and durability. The B32 featured a cast iron block and an aluminum cylinder head, employing a single overhead camshaft (SOHC) design with two valves per cylinder. Fuel delivery was managed by Bosch Motronic multi-port fuel injection, a significant advancement over earlier carburetor-based systems, improving both performance and fuel efficiency. The M30B32 produced 197 horsepower at 5500 rpm and 285 Nm (210 lb-ft) of torque at 4300 rpm. The engine’s longitudinal mounting and rear-wheel-drive configuration were typical of BMW’s engineering philosophy at the time. The 732i was equipped with a 5-speed manual transmission as standard, offering precise gear changes and a direct connection to the engine. A 4-speed automatic transmission was also available, catering to drivers prioritizing comfort and convenience.
Driving Characteristics
The 732i offered a refined and balanced driving experience. While not as overtly sporty as the 745i, the 3.2-liter engine provided ample power for comfortable cruising and confident overtaking. The manual transmission version allowed for greater driver involvement, while the automatic offered smooth and effortless shifts. The gear ratios were tuned to prioritize mid-range torque, making the car responsive in everyday driving situations. Compared to the larger 745i, the 732i felt slightly less urgent in acceleration, but it also offered improved fuel economy. The suspension, featuring McPherson struts at the front and independent coil springs at the rear, provided a comfortable ride without sacrificing handling precision. The steering was precise and well-weighted, contributing to a confident feel behind the wheel.
Equipment & Trim Levels
The 732i came standard with a comprehensive list of features, reflecting its status as a luxury sedan. These included power windows, power locks, central locking, air conditioning, and a high-quality sound system. The interior was typically trimmed with cloth upholstery, although leather was available as an option. Wood trim was used extensively throughout the cabin, adding to the sense of luxury. Optional extras included a sunroof, heated seats, and a more advanced audio system. The 732i’s trim level was generally considered mid-range within the E23 lineup, offering a good balance of features and price.
Chassis & Braking
The E23 7 Series featured a robust chassis designed for both comfort and handling. The front suspension utilized McPherson struts with coil springs and an anti-roll bar, while the rear suspension employed an independent coil spring setup. The 732i was equipped with disc brakes at the front and drum brakes at the rear. While the drum brakes at the rear were a cost-saving measure, they provided adequate stopping power for most driving conditions. The car’s weight distribution was carefully balanced, contributing to its neutral handling characteristics. The standard tire size was 205/70 R14, providing a good compromise between ride comfort and grip.
Market Reception & Comparison
The 732i was generally well-received by automotive critics. It was praised for its smooth engine, comfortable ride, and refined interior. However, some critics noted that it lacked the outright performance of the 745i. Compared to its siblings, the 732i offered a more affordable entry point into the 7 Series range, making it appealing to a wider range of buyers. Its fuel economy was also better than that of the larger-displacement models. In terms of reliability, the M30B32 engine proved to be very durable, although regular maintenance was essential to prevent issues such as oil leaks and cooling system problems.
Legacy
The BMW 732i remains a desirable classic car today, appreciated for its elegant styling, refined driving experience, and robust engineering. The M30B32 engine is known for its longevity and relatively simple maintenance requirements. While finding well-maintained examples can be challenging, the 732i offers a unique opportunity to experience a classic BMW luxury sedan. In the used car market, prices vary depending on condition and mileage, but well-preserved examples can command a premium. The 732i represents a pivotal moment in BMW’s history, showcasing the company’s commitment to innovation and quality.
