The BMW 7 Series (E23) 732i, produced between 1979 and 1983, represented a significant step forward for BMW in the luxury sedan segment. Positioned as a mid-range offering within the initial E23 generation, the 732i aimed to balance performance and refinement with a more accessible price point compared to the flagship 735i and 745i models. It was the first generation of the 7 Series, replacing the BMW E21, and served as a technological showcase for the Bavarian automaker, introducing features previously unseen in BMW’s lineup. The E23 platform, internally designated as the ‘E23’, was a clean-sheet design intended to establish BMW as a serious competitor to Mercedes-Benz in the full-size luxury car market.
Technical Specifications
| Brand | BMW |
| Model | 7 Series |
| Generation | 7 Series (E23) |
| Type (Engine) | 732i (197 Hp) Automatic |
| Start of production | 1979 |
| End of production | 1983 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 18.1 l/100 km (13 US mpg, 15.6 UK mpg, 5.5 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 10.8 sec |
| Acceleration 0 – 62 mph | 10.8 sec |
| Acceleration 0 – 60 mph | 10.3 sec |
| Maximum speed | 198 km/h (123.03 mph) |
| Weight-to-power ratio | 7.8 kg/Hp, 127.5 Hp/tonne |
| Weight-to-torque ratio | 5.5 kg/Nm, 181.2 Nm/tonne |
| Power | 197 Hp @ 5500 rpm |
| Power per litre | 61.4 Hp/l |
| Torque | 280 Nm @ 4300 rpm (206.52 lb.-ft. @ 4300 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | 326EZ1 |
| 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 | 9.3:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | SOHC |
| Engine oil capacity | 5.8 l (6.13 US qt | 5.1 UK qt) |
| Coolant | 12 l (12.68 US qt | 10.56 UK qt) |
| Kerb Weight | 1545 kg (3406.14 lbs.) |
| Max. weight | 2000 kg (4409.25 lbs.) |
| Max load | 455 kg (1003.1 lbs.) |
| 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 track | 1524 mm (60 in.) |
| Ride height (ground clearance) | 132 mm (5.2 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 3 |
| Gearbox type | Automatic transmission |
| Front suspension | Independent, McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Tires size | 205/70 HR14; 220/55 HR390 TRX |
| Wheel rims size | 6.5 J x 14; 165 T 390 |
Powertrain & Engine Architecture
The 732i was powered by BMW’s M30 inline-six engine, specifically the 326EZ1 variant. This 3.2-liter engine featured a single overhead camshaft (SOHC) valvetrain, two valves per cylinder, and Bosch L-Jetronic multi-port fuel injection. The engine produced 197 horsepower at 5500 rpm and 280 Nm (206.52 lb-ft) of torque at 4300 rpm. The engine’s design emphasized smooth power delivery and refinement, rather than outright performance. The automatic transmission was a 3-speed unit, chosen to provide comfortable and effortless cruising. This transmission was not known for its sportiness, prioritizing smooth shifts over rapid acceleration. The engine was mounted longitudinally in the front of the vehicle, driving the rear wheels.
Driving Characteristics
The 732i’s driving experience was characterized by its comfortable ride and refined engine. While the 197 hp engine provided adequate power for highway cruising and passing maneuvers, it wasn’t particularly quick. Acceleration from 0 to 60 mph took around 10.3 seconds, and top speed was limited to 198 km/h (123 mph). Compared to the 735i with its larger 3.5-liter engine and manual transmission option, the 732i felt noticeably slower and less engaging. The automatic transmission, while smooth, contributed to a less direct driving feel. The gear ratios were optimized for fuel economy and comfort, rather than performance. However, for drivers prioritizing a relaxed and refined driving experience, the 732i offered a compelling package.
Equipment & Trim Levels
The 732i came standard with a respectable level of equipment for its time, including power windows, central locking, and a high-quality sound system. Interior upholstery was typically cloth, although leather was available as an option. The dashboard featured wood trim and analog gauges, reflecting BMW’s commitment to a luxurious interior environment. Optional extras included a sunroof, air conditioning, and upgraded audio systems. The 732i was positioned as a more accessible entry point into the 7 Series range, so it lacked some of the more extravagant features found on the higher-end models.
Chassis & Braking
The E23 7 Series featured an independent suspension system at all four wheels. The front suspension utilized a McPherson strut design with coil springs and an anti-roll bar, while the rear suspension employed a semi-trailing arm setup with coil springs. The 732i was equipped with ventilated disc brakes at the front and solid disc brakes at the rear. An anti-lock braking system (ABS) was available as an option, a relatively advanced feature for the early 1980s. The chassis was designed to provide a comfortable ride and good handling balance, although it wasn’t as sporty as some of BMW’s other models. The weight distribution was relatively balanced, contributing to predictable handling characteristics.
Market Reception & Comparison
The 732i was generally well-received by automotive critics, who praised its comfortable ride, refined engine, and luxurious interior. However, some critics noted that its performance was not as impressive as that of its larger-engined siblings. Fuel economy was also a concern, with the 732i consuming around 18.1 l/100 km (13 US mpg) in urban driving. Compared to the 735i, the 732i offered a more affordable entry point into the 7 Series range, but at the expense of performance. The 732i appealed to buyers who prioritized comfort and refinement over outright speed.
Legacy
The E23 7 Series, including the 732i variant, is now considered a classic BMW. The M30 engine is known for its durability and reliability, and well-maintained examples can still provide years of service. The 732i’s automatic transmission, while not particularly sporty, is also generally reliable. Today, the E23 7 Series is a sought-after vehicle among BMW enthusiasts, and prices for well-preserved examples are steadily increasing. The 732i, while not the most powerful or desirable variant, remains a viable option for those seeking a classic BMW luxury sedan with a comfortable ride and a refined driving experience. Finding parts can be challenging, but a dedicated network of BMW specialists and aftermarket suppliers ensures that these cars can be kept on the road.
