The BMW 3 Series Sedan (E30) 325i, produced from 1986 to 1987, represents a pivotal point in the evolution of BMW’s iconic 3 Series. Positioned as a performance-oriented variant within the E30 generation (1982-1991), the 325i offered a significant step up in power and refinement compared to the base 318i models. It played a crucial role in establishing the 3 Series as the benchmark for compact sports sedans, particularly in the North American market where it gained a strong following for its balanced handling and engaging driving experience. The E30 platform, internally designated as the E30, was BMW’s first foray into a truly modern, mass-produced sports sedan.
| Brand | BMW |
| Model | 3 Series |
| Generation | 3 Series Sedan (E30) |
| Type (Engine) | 325i (170 Hp) |
| Start of production | 1986 |
| End of production | 1987 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 12.9 l/100 km (18.2 US mpg) |
| Fuel consumption (extra urban) | 7.2 l/100 km (32.7 US mpg) |
| Fuel consumption (combined) | 9 l/100 km (26.1 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.3 sec |
| Acceleration 0 – 62 mph | 8.3 sec |
| Acceleration 0 – 60 mph | 7.9 sec |
| Maximum speed | 218 km/h (135.46 mph) |
| Weight-to-power ratio | 7.1 kg/Hp |
| Weight-to-torque ratio | 5.4 kg/Nm |
| Power | 170 Hp @ 5800 rpm |
| Torque | 222 Nm @ 4300 rpm (163.74 lb.-ft. @ 4300 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M20B25 |
| Engine displacement | 2494 cm3 (152.19 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 75 mm (2.95 in.) |
| Compression ratio | 9.7:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated |
| Engine oil capacity | 4.25 l (4.49 US qt | 3.74 UK qt) |
| Coolant capacity | 10.5 l (11.1 US qt | 9.24 UK qt) |
| Kerb Weight | 1200 kg (2645.55 lbs.) |
| Max. weight | 1660 kg (3659.67 lbs.) |
| Max load | 460 kg (1014.13 lbs.) |
| Trunk (boot) space – minimum | 425 l (15.01 cu. ft.) |
| Fuel tank capacity | 55 l (14.53 US gal | 12.1 UK gal) |
| Length | 4325 mm (170.28 in.) |
| Width | 1645 mm (64.76 in.) |
| Height | 1380 mm (54.33 in.) |
| Wheelbase | 2570 mm (101.18 in.) |
| Front track | 1405 mm (55.31 in.) |
| Rear track | 1415 mm (55.71 in.) |
| Front overhang | 761 mm (29.96 in.) |
| Rear overhang | 994 mm (39.13 in.) |
| Drag coefficient (Cd) | 0.35 |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 5 |
| Gearbox type | Manual transmission |
| Front suspension | Coil spring |
| Rear suspension | Coil spring |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic |
| Tires size | 195/65 R14 |
| Wheel rims size | 14 |
Powertrain & Engine Architecture
The heart of the 325i is the M20B25 engine, a 2.5-liter inline-six cylinder powerplant. This engine, a cornerstone of BMW’s engineering prowess during the 1980s, featured a cast iron block and an aluminum cylinder head. It utilized Bosch Motronic fuel injection, a sophisticated system for its time, which precisely controlled fuel delivery based on engine speed, load, and other parameters. The M20B25 employed a single overhead camshaft (SOHC) design with two valves per cylinder, a configuration that balanced performance and reliability. The engine’s 9.7:1 compression ratio contributed to its responsive nature. The 325i was exclusively offered with a Getrag 265 five-speed manual transmission, known for its precise shifts and durability. This transmission was a key component in delivering the engine’s power to the rear wheels.
Driving Characteristics
The 325i’s driving experience was defined by its balanced chassis and responsive engine. The 170 horsepower and 164 lb-ft of torque provided brisk acceleration, with a 0-60 mph time of around 7.9 seconds. While not a drag racer, the 325i excelled in providing a connected and engaging driving experience. The manual transmission allowed for precise control, and the rear-wheel-drive layout contributed to its neutral handling characteristics. Compared to the lower-powered 318i, the 325i offered a noticeable improvement in performance, particularly in highway passing situations. The gear ratios were well-matched to the engine’s powerband, providing strong acceleration in each gear. The suspension, featuring coil springs and shock absorbers, provided a comfortable ride while maintaining good body control.
Equipment & Trim Levels
The 325i typically came standard with features considered premium for the time, including power windows, power door locks, and a sunroof. Interior upholstery was typically cloth, although leather was available as an option. The dashboard layout was functional and driver-focused, with clearly marked gauges and controls. Optional extras included air conditioning, a premium sound system, and metallic paint finishes. The 325i was often distinguished by its sport seats, which provided additional support during spirited driving. The trim level was generally consistent, with options being the primary way to personalize the vehicle.
Chassis & Braking
The E30 325i featured a robust chassis with independent suspension at all four wheels. The front suspension utilized MacPherson struts, while the rear suspension employed a semi-trailing arm design. This setup provided a good balance of ride comfort and handling precision. Braking duties were handled by disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) was available as an option, enhancing safety by preventing wheel lockup during hard braking. The 325i’s relatively light weight (around 2645 lbs) contributed to its agile handling.
Market Reception & Comparison
The 325i was widely praised by automotive critics for its performance, handling, and build quality. It was often compared favorably to its rivals, such as the Mercedes-Benz 190E and the Audi 80. The 325i offered a more engaging driving experience than many of its competitors, and its relatively affordable price made it an attractive option for enthusiasts. Compared to the 318i, the 325i offered a significant performance upgrade, but at a higher price point. The 325i’s fuel economy was reasonable for its time, averaging around 26 mpg in combined driving. Reliability was generally good, although maintenance costs could be higher than those of some other vehicles in its class.
Legacy
The E30 325i has become a highly sought-after classic car, appreciated by enthusiasts for its timeless design and engaging driving experience. The M20B25 engine is known for its durability and relatively simple maintenance requirements, although age-related issues such as oil leaks and worn seals are common. Well-maintained examples of the 325i command premium prices in the used car market. The E30 325i’s influence can still be felt in modern BMWs, as it helped establish the brand’s reputation for building sporty and refined sedans. It remains a benchmark for compact sports sedans and a testament to BMW’s engineering excellence.
