The BMW M3 Convertible (E46) 3.2i 24V, produced between 2001 and 2006, represents the open-top variant of BMW’s highly acclaimed E46 M3. Positioned as the performance flagship of the E46 convertible range, it combined the M3’s potent engine and chassis technology with the added enjoyment of open-air motoring. This model occupied the premium segment, offering a more engaging and visceral driving experience than the standard 3 Series convertibles. It was a key part of the E46 generation, built on the 3 Series platform (E46) and sharing many components, but distinguished by its high-revving engine, upgraded suspension, and aggressive styling cues.
Technical Specifications
| Brand | BMW |
| Model | M3 |
| Generation | M3 Convertible (E46) |
| Type (Engine) | 3.2i 24V (343 Hp) |
| Start of production | 2001 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (economy) – urban | 17.9 l/100 km (13.1 US mpg, 15.8 UK mpg, 5.6 km/l) |
| Fuel consumption (economy) – extra urban | 8.8 l/100 km (26.7 US mpg, 32.1 UK mpg, 11.4 km/l) |
| Fuel consumption (economy) – combined | 12.1 l/100 km (19.4 US mpg, 23.3 UK mpg, 8.3 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.5 sec |
| Acceleration 0 – 62 mph | 5.5 sec |
| Acceleration 0 – 60 mph | 5.2 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Weight-to-power ratio | 4.8 kg/Hp, 207.3 Hp/tonne |
| Weight-to-torque ratio | 4.5 kg/Nm, 220.5 Nm/tonne |
| Power | 343 Hp @ 7900 rpm |
| Power per litre | 105.7 Hp/l |
| Torque | 365 Nm @ 4900 rpm (269.21 lb.-ft. @ 4900 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | S54B32 |
| Engine displacement | 3246 cm3 (198.08 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 87 mm (3.43 in.) |
| Piston Stroke | 91 mm (3.58 in.) |
| Compression ratio | 11.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 5.5 l (5.81 US qt | 4.84 UK qt) |
| Coolant | 10 l (10.57 US qt | 8.8 UK qt) |
| Kerb Weight | 1655 kg (3648.65 lbs.) |
| Max. weight | 2100 kg (4629.71 lbs.) |
| Max load | 445 kg (981.06 lbs.) |
| Trunk (boot) space – minimum | 300 l (10.59 cu. ft.) |
| Fuel tank capacity | 63 l (16.64 US gal | 13.86 UK gal) |
| Length | 4492 mm (176.85 in.) |
| Width | 1780 mm (70.08 in.) |
| Height | 1363 mm (53.66 in.) |
| Wheelbase | 2731 mm (107.52 in.) |
| Front track | 1508 mm (59.37 in.) |
| Rear (Back) track | 1525 mm (60.04 in.) |
| Drag coefficient (Cd) | 0.35 |
| Minimum turning circle | 11.0 m (36.09 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Wishbone |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 225/45 R18; 255/40 R18 |
| Wheel rims size | 8J x 18; 9J x 18 |
Powertrain & Engine Architecture
The heart of the E46 M3 Convertible is the S54B32, a 3.2-liter inline-six engine. This engine is a naturally aspirated masterpiece, renowned for its high-revving character and linear power delivery. It features individual throttle bodies, double VANOS (variable valve timing), and a high compression ratio of 11.5:1. The fuel injection system is a multi-port system, ensuring precise fuel delivery. The S54 engine was a significant departure from the typical BMW inline-sixes of the time, designed specifically for performance. The engine’s code, S54, is instantly recognizable to enthusiasts. The six-speed manual transmission was standard, providing precise gear changes and enhancing the driving experience. The transmission featured robust internals to handle the engine’s substantial power output.
Driving Characteristics
The M3 Convertible, even with the added weight of the convertible top mechanism, delivered exhilarating performance. The 343 horsepower and 269 lb-ft of torque allowed for a 0-60 mph time of around 5.2 seconds. The engine’s peak torque arrived at 4900 rpm, providing strong acceleration throughout the rev range. The six-speed manual transmission’s gear ratios were well-matched to the engine’s powerband, allowing for quick and precise shifts. Compared to the standard E46 convertibles, the M3 offered significantly sharper handling and a more responsive driving experience. While not as stiff as the coupe, the convertible chassis was well-braced and provided a confident feel on both winding roads and highways.
Equipment & Trim Levels
The M3 Convertible came generously equipped, reflecting its premium positioning. Standard features included leather upholstery, power-adjustable seats, automatic climate control, and a premium sound system. The interior featured M-specific badging and trim, including aluminum accents and sport seats. Optional extras included a navigation system, upgraded sound system, and various interior trim options. The convertible top was a power-operated soft top, available in several colors. The M3 also featured a more aggressive exterior styling package, including wider fenders, a front splitter, and a rear spoiler.
Chassis & Braking
The M3 Convertible benefited from a significantly upgraded chassis compared to the standard E46 convertibles. It featured a reinforced chassis, stiffer springs, and upgraded dampers. The front suspension utilized a multi-link design, while the rear suspension employed a semi-trailing arm setup. Braking duties were handled by large ventilated discs at all four corners, providing excellent stopping power. An Anti-lock Braking System (ABS) was standard. The M3 also featured a more direct steering ratio, enhancing responsiveness and feel.
Market Reception & Comparison
The E46 M3 Convertible was widely praised by automotive critics for its performance, handling, and overall driving experience. It was often lauded as one of the best performance convertibles available at the time. Compared to other convertibles in its class, the M3 offered a more focused and engaging driving experience. Fuel economy, while not a priority for M3 buyers, was reasonable for a high-performance vehicle, averaging around 19.4 US mpg in combined driving. Reliability was generally good, although the S54 engine required regular maintenance, including oil changes and valve adjustments.
Legacy
The E46 M3 Convertible remains a highly sought-after vehicle among enthusiasts. The S54 engine is considered one of the greatest engines ever produced by BMW, and the E46 M3 as a whole is regarded as a modern classic. Well-maintained examples command high prices in the used car market. The powertrain, while requiring diligent maintenance, is generally considered robust and reliable when properly cared for. The E46 M3 Convertible represents a sweet spot in BMW’s history, combining performance, luxury, and open-air enjoyment in a compelling package.
