The BMW Z4 G29 LCI 30i sDrive Steptronic, introduced in September 2022 as part of the facelift for the G29 generation Z4, represents a mid-range offering in the model lineup. Positioned above the entry-level 20i and below the performance-oriented M40i, the 30i balances performance and efficiency in BMW’s two-seater roadster. Production continued through March 2026. This iteration of the Z4 builds upon the foundation laid by the G29 platform, which debuted in 2019, offering a modern take on the classic roadster experience with updated styling, technology, and powertrain refinements. The LCI (Life Cycle Impulse) facelift brought subtle but significant changes to the exterior and interior, enhancing the car’s overall appeal.
Technical Specifications
| Brand | BMW |
| Model | Z4 |
| Generation | Z4 (G29 LCI, facelift 2022) |
| Type (Engine) | 30i (258 Hp) sDrive Steptronic |
| Start of production | September, 2022 |
| End of production | March, 2026 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Roadster |
| Seats | 2 |
| Doors | 2 |
| Combined fuel consumption (WLTP) | 7-7.4 l/100 km (33.6 – 31.8 US mpg, 40.4 – 38.2 UK mpg, 14.3 – 13.5 km/l) |
| CO2 emissions (WLTP) | 159-167 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.4 sec |
| Acceleration 0 – 62 mph | 5.4 sec |
| Acceleration 0 – 60 mph | 5.1 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 5.7 kg/Hp, 175.5 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 272.1 Nm/tonne |
| Power | 258 Hp @ 5000-6500 rpm |
| Power per litre | 129.1 Hp/l |
| Torque | 400 Nm @ 1550-4400 rpm (295.02 lb.-ft. @ 1550-4400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B48 |
| Engine displacement | 1998 cm3 (121.93 cu. in.) |
| Number of cylinders | 4 |
| 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 | 5.25 l (5.55 US qt | 4.62 UK qt) |
| Kerb Weight | 1470 kg (3240.8 lbs.) |
| Max. weight | 1760 kg (3880.14 lbs.) |
| Max load | 290 kg (639.34 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 | 4324 mm (170.24 in.) |
| Width | 1864 mm (73.39 in.) |
| Height | 1304 mm (51.34 in.) |
| Wheelbase | 2470 mm (97.24 in.) |
| Front track | 1618 mm (63.7 in.) |
| Rear (Back) track | 1613 mm (63.5 in.) |
| Ride height (ground clearance) | 117 mm (4.61 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle (turning diameter) | 11 m (36.09 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Spring Strut |
| Rear suspension | Independent multi-link suspension |
| 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: 225/45 R18 Rear wheel tires: 255/40 R18 |
| Wheel rims size | Front wheel rims: 8J x 18 Rear wheel rims: 9J x 18 |
Powertrain & Engine Architecture
At the heart of the Z4 30i lies the BMW B48 2.0-liter inline-four cylinder engine. This engine is a member of BMW’s modular engine family, known for its efficiency and performance. The B48 utilizes direct fuel injection, a single 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 deliver a broad torque curve and responsive power delivery. The engine produces 258 horsepower at 5,000-6,500 rpm and 295 lb-ft of torque between 1,550 and 4,400 rpm. The engine is longitudinally mounted, driving the rear wheels. The transmission is an 8-speed Steptronic automatic, offering smooth and quick shifts. This transmission is known for its adaptability, offering both automatic and manual shift modes via steering wheel-mounted paddles.
Driving Characteristics
The Z4 30i sDrive Steptronic delivers a balanced driving experience. The 258 hp and 295 lb-ft of torque provide ample power for spirited driving, with a 0-60 mph time of around 5.1 seconds. The automatic transmission is well-tuned, providing seamless gear changes and contributing to a comfortable ride. Compared to the more powerful M40i, the 30i offers a slightly less aggressive experience, prioritizing refinement and fuel efficiency. The gear ratios are optimized for both acceleration and highway cruising. While not as engaging as a manual transmission, the Steptronic unit allows for driver involvement through its paddle shifters. The rear-wheel drive configuration contributes to the car’s balanced handling and playful dynamics.
Equipment & Trim Levels
The Z4 30i typically came well-equipped as standard. Features included leatherette upholstery, a BMW Live Cockpit Professional with a 12.3-inch digital instrument cluster, and a 10.25-inch central information display. Standard safety features included automatic emergency braking, lane departure warning, and forward collision warning. Optional extras included premium leather upholstery, a Harman Kardon sound system, adaptive cruise control, and a head-up display. The LCI facelift brought updated interior trim options and new exterior color choices. The overall interior design focused on a driver-centric layout with high-quality materials.
Chassis & Braking
The Z4 G29 utilizes a lightweight chassis construction, incorporating aluminum components to reduce weight and enhance rigidity. The front suspension features a spring strut design, while the rear employs an independent multi-link suspension. This setup provides a good balance between comfort and handling. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) is standard. The steering is an electric power steering system, offering precise and responsive control.
Market Reception & Comparison
The Z4 30i was generally well-received by automotive critics. It was praised for its balanced performance, comfortable ride, and refined interior. Compared to the base 20i model, the 30i offered a significant performance upgrade without the higher price tag of the M40i. Fuel economy was also a strong point, with the 30i achieving around 31.8-33.6 US mpg in combined driving. Some critics noted that the engine lacked the character of a larger displacement engine, but acknowledged its overall competence and efficiency. Compared to competitors like the Porsche 718 Boxster, the Z4 30i offered a more affordable entry point into the roadster segment.
Legacy
The BMW Z4 G29 LCI 30i sDrive Steptronic represents a compelling option in the used car market. The B48 engine has proven to be relatively reliable, although regular maintenance is crucial. The 8-speed Steptronic transmission is also known for its durability. As a modern roadster, the Z4 30i offers a blend of performance, comfort, and technology that continues to appeal to enthusiasts. Its balanced driving dynamics and refined interior make it a desirable choice for those seeking a fun and engaging driving experience.
