The BMW Z4 M40i (G29 LCI), introduced with the 2022 facelift and continuing through the 2026 model year, represents the performance pinnacle of the third-generation Z4 Roadster. Positioned as the flagship variant, it delivers a significantly more potent driving experience than the base 2.0-liter models. The “LCI” designation signifies a Life Cycle Impulse, BMW’s term for a comprehensive mid-cycle refresh, bringing styling updates and technological enhancements to the G29 platform. This variant is exclusively a rear-wheel drive roadster, designed to compete with other premium sports cars like the Porsche 718 Boxster and the Mercedes-Benz SLC (now discontinued).
Technical Specifications
| Brand | BMW |
| Model | Z4 |
| Generation | Z4 (G29 LCI, facelift 2022) |
| Type (Engine) | M40i (382 Hp) |
| Start of production | 2024 |
| End of production | March, 2026 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Roadster |
| Seats | 2 |
| Doors | 2 |
| Fuel consumption (economy) – urban (EPA) | 12.4 l/100 km (19 US mpg, 22.8 UK mpg, 8.1 km/l) |
| Fuel consumption (economy) – extra urban (EPA) | 9 l/100 km (26.1 US mpg, 31.4 UK mpg, 11.1 km/l) |
| Fuel consumption (economy) – combined (EPA) | 10.7 l/100 km (22 US mpg, 26.4 UK mpg, 9.3 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 60 mph | 4.2 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Weight-to-power ratio | 4.2 kg/Hp, 239.6 Hp/tonne |
| Weight-to-torque ratio | 3.2 kg/Nm, 313.7 Nm/tonne |
| Power | 382 Hp @ 5800-6500 rpm |
| Power per litre | 127.4 Hp/l |
| Torque | 500 Nm @ 1800-5000 rpm (368.78 lb.-ft. @ 1800-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B58B30O1 |
| Engine displacement | 2998 cm3 (182.95 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 10.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Valvetrain | VALVETRONIC, Double-VANOS |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Kerb Weight | 1594 kg (3514.17 lbs.) |
| Max. weight | 1845 kg (4067.53 lbs.) |
| Max load | 251 kg (553.36 lbs.) |
| Trunk (boot) space – minimum | 281 l (9.92 cu. ft.) |
| Fuel tank capacity | 52 l (13.74 US gal | 11.44 UK gal) |
| Length | 4337 mm (170.75 in.) |
| Width | 1864 mm (73.39 in.) |
| Width including mirrors | 2024 mm (79.69 in.) |
| Height | 1304 mm (51.34 in.) |
| Wheelbase | 2470 mm (97.24 in.) |
| Front track | 1594 mm (62.76 in.) |
| Rear (Back) track | 1589 mm (62.56 in.) |
| Ride height (ground clearance) | 119 mm (4.69 in.) |
| Minimum turning circle (turning diameter) | 11 m (36.09 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Spring Strut, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | Front wheel tires: 255/35 R19 Rear wheel tires: 285/30 R20 |
| Wheel rims size | Front wheel rims: 9J x 19 Rear wheel rims: 10J x 20 |
Powertrain & Engine Architecture
At the heart of the Z4 M40i lies the BMW B58B30O1 engine, a 3.0-liter inline-six cylinder powerplant. This engine is a member of BMW’s modular engine family, known for its smooth power delivery and robust construction. It utilizes direct fuel injection, a twin-scroll turbocharger, and BMW’s VALVETRONIC variable valve timing and lift system, along with Double-VANOS variable camshaft timing. These technologies work in concert to optimize efficiency and performance across the engine’s operating range. The B58 engine is renowned for its responsiveness and linear powerband, making it a favorite among enthusiasts. The 6-speed manual transmission is standard, providing a direct connection to the engine and enhancing the driving experience.
Driving Characteristics
The Z4 M40i delivers a thrilling driving experience characterized by its sharp handling and potent acceleration. The rear-wheel-drive configuration and well-tuned suspension contribute to a balanced and engaging feel. The 4.2-second 0-60 mph sprint is indicative of its performance capabilities. Compared to the base 2.0-liter Z4, the M40i offers a significantly more muscular feel, with readily available torque throughout the rev range. The manual transmission allows for precise gear selection and maximizes driver control. While the 2.0-liter models prioritize fuel efficiency, the M40i is geared towards delivering a pure sports car experience.
Equipment & Trim Levels
The Z4 M40i comes standard with a comprehensive suite of features, including leather upholstery, a premium sound system, and a suite of driver-assistance technologies. Optional extras include adaptive suspension, upgraded brakes, and various interior trim options. The interior design emphasizes a driver-focused layout, with intuitive controls and a modern aesthetic. The LCI facelift brought updated infotainment systems and digital instrument clusters, enhancing the overall technological sophistication of the vehicle.
Chassis & Braking
The Z4 M40i features a lightweight chassis designed to maximize agility and handling. The suspension utilizes a spring-strut setup at the front and an independent multi-link suspension at the rear, providing a comfortable yet controlled ride. Ventilated disc brakes are standard on all four wheels, offering ample stopping power. The electronic power steering system provides precise and responsive steering feel. The M40i benefits from a slightly stiffer suspension tuning compared to the base models, further enhancing its handling capabilities.
Market Reception & Comparison
The Z4 M40i has been well-received by automotive critics, who praise its engaging driving dynamics, powerful engine, and refined interior. It is often cited as one of the most enjoyable roadsters on the market. Compared to the 2.0-liter Z4 models, the M40i commands a higher price but offers a significantly more rewarding driving experience. Fuel economy is understandably lower than the base models, but the performance gains are considered well worth the trade-off by enthusiasts.
Legacy
The B58 engine has proven to be a remarkably reliable powerplant, and the Z4 M40i is expected to hold its value well in the used car market. Its combination of performance, luxury, and driving enjoyment makes it a desirable choice for sports car enthusiasts. As a modern classic, the G29 Z4 M40i represents a high point in BMW’s roadster heritage, offering a compelling blend of tradition and innovation.
