The BMW Z4 G29 LCI 20i sDrive Steptronic, introduced in September 2022 as part of the Life Cycle Impulse (LCI) facelift for the G29 Z4 generation, represents the entry point into the modern Z4 roadster lineup. Positioned as a more accessible option, it offers a blend of BMW’s signature driving dynamics with a focus on fuel efficiency and everyday usability. Production of this variant continued through March 2026. The G29 Z4, launched in 2018, marked a significant departure from its predecessor, moving to a jointly-developed platform with the Toyota Supra, and the 20i variant aimed to broaden the Z4’s appeal beyond the performance-focused M40i model.
Technical Specifications
| Brand | BMW |
| Model | Z4 |
| Generation | Z4 (G29 LCI, facelift 2022) |
| Type (Engine) | 20i (197 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) | 6.9-7.3 l/100 km (34.1 – 32.2 US mpg, 40.9 – 38.7 UK mpg, 14.5 – 13.7 km/l) |
| CO2 emissions (WLTP) | 157-164 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.6 sec |
| Acceleration 0 – 62 mph | 6.6 sec |
| Acceleration 0 – 60 mph | 6.3 sec |
| Maximum speed | 240 km/h (149.13 mph) |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 7.4 kg/Hp, 135.9 Hp/tonne |
| Weight-to-torque ratio | 4.5 kg/Nm, 220.7 Nm/tonne |
| Power | 197 Hp @ 4500-6500 rpm |
| Power per litre | 98.6 Hp/l |
| Torque | 320 Nm @ 1450-4200 rpm (236.02 lb.-ft. @ 1450-4200 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 | 1450 kg (3196.7 lbs.) |
| Max. weight | 1740 kg (3836.04 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 20i 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, operating at pressures up to 350 bar, and is equipped with a twin-scroll turbocharger with an intercooler to minimize turbo lag and maximize boost. BMW’s VALVETRONIC technology, a variable valve timing and lift system, and Double-VANOS (variable camshaft timing) further optimize engine breathing and responsiveness. The engine produces 197 horsepower at 4,500-6,500 rpm and 320 Nm (236 lb-ft) of torque between 1,450 and 4,200 rpm. This power is channeled through an 8-speed Steptronic automatic transmission, known for its smooth shifts and quick response. The transmission is configured for rear-wheel drive (sDrive), contributing to the Z4’s sporty handling characteristics.
Driving Characteristics
The Z4 20i sDrive Steptronic offers a comfortable and engaging driving experience. While not as overtly sporty as the M40i, the 2.0-liter engine provides ample power for everyday driving and spirited weekend excursions. The 8-speed automatic transmission is well-tuned, offering smooth and timely gear changes. Acceleration from 0 to 60 mph takes approximately 6.3 seconds. The gear ratios are optimized for a balance of acceleration and fuel economy. Compared to the higher-output M40i, the 20i feels less urgent off the line, but its lighter weight and more balanced chassis contribute to a nimble feel in corners. The automatic transmission, while convenient, doesn’t offer the same level of driver control as the available manual transmission in some markets.
Equipment & Trim Levels
The Z4 20i sDrive Steptronic typically came equipped with a generous array of standard features. These included BMW’s iDrive infotainment system with a touchscreen display, navigation, automatic climate control, leatherette upholstery, and a suite of driver-assistance systems such as lane departure warning and forward collision warning. Optional extras included premium leather upholstery, a head-up display, adaptive cruise control, and a Harman Kardon sound system. Trim levels were relatively streamlined, with options primarily focused on adding individual features rather than distinct packages. The LCI facelift brought updated interior trim options and enhanced connectivity features.
Chassis & Braking
The Z4 G29 utilizes a lightweight chassis construction, incorporating high-strength steel and aluminum components. The front suspension employs a spring-strut design, while the rear features a sophisticated independent multi-link suspension. This setup provides a good balance of ride comfort and handling precision. The Z4 20i is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) is standard. The steering is an electric power-assisted rack and pinion system, offering precise and responsive control. The standard tire size is 225/45 R18 at the front and 255/40 R18 at the rear, mounted on 8J x 18 and 9J x 18 alloy wheels, respectively.
Market Reception & Comparison
The Z4 20i sDrive Steptronic was generally well-received by automotive critics as a compelling entry-level option in the roadster segment. It was praised for its fuel efficiency (6.9-7.3 l/100 km) and comfortable ride. Compared to the Z4 M40i, the 20i offered a more affordable price point, making it accessible to a wider range of buyers. However, some reviewers noted that the 2.0-liter engine lacked the outright performance of the M40i’s inline-six. In terms of reliability, the B48 engine has proven to be generally robust, although some early models experienced issues with the timing chain tensioner.
Legacy
The BMW Z4 G29 LCI 20i sDrive Steptronic represents a modern interpretation of the classic roadster formula. Its blend of performance, efficiency, and technology has made it a popular choice among enthusiasts. On the used car market, these models are generally well-regarded, with prices varying depending on mileage, condition, and options. The B48 engine’s proven reliability and relatively low maintenance costs contribute to its long-term appeal. As a more accessible entry point into the Z4 lineup, the 20i helped broaden the model’s reach and solidify its position as a competitive roadster in the premium segment.
