The BMW X4 M40i, specifically the G02 LCI (Life Cycle Impulse – facelift) model produced from 2021 onwards, represents a performance-oriented variant within the second generation of the X4 Sports Activity Coupe (SAC). Positioned as a mid-to-high range offering, the M40i combines a potent inline-six engine with mild-hybrid technology and BMW’s xDrive all-wheel-drive system. This iteration of the X4 aimed to deliver a blend of sporty handling, luxurious comfort, and respectable fuel efficiency within the premium compact SUV segment. The LCI facelift brought updated styling cues, enhanced technology, and refinements to the powertrain.
Technical Specifications
| Brand | BMW |
| Model | X4 |
| Generation | X4 (G02 LCI, facelift 2021) |
| Type | M40i (360 Hp) Mild Hybrid xDrive Steptronic |
| Start of production | 2021 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SAC (Sports Activity Coupe) |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 8.7-9.5 l/100 km (27 – 24.8 US mpg) |
| CO2 emissions (WLTP) | 198-215 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.9 sec |
| Acceleration 0 – 62 mph | 4.9 sec |
| Acceleration 0 – 60 mph | 4.7 sec |
| Maximum speed | 250 km/h (155.34 mph) – Electronically limited |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 5.3 kg/Hp |
| Weight-to-torque ratio | 3.8 kg/Nm |
| Electric motor power | 11 Hp |
| Electric motor location | Front, Longitudinal |
| Power | 360 Hp @ 5200-6500 rpm |
| Torque | 500 Nm @ 1900-5000 rpm (368.78 lb.-ft. @ 1900-5000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B58B30B |
| 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 | 7.2 l (7.61 US qt | 6.34 UK qt) |
| Kerb Weight | 1920 kg (4232.88 lbs.) |
| Max. weight | 2500 kg (5511.56 lbs.) |
| Max load | 580 kg (1278.68 lbs.) |
| Trunk (boot) space – minimum | 525 l (18.54 cu. ft.) |
| Trunk (boot) space – maximum | 1430 l (50.5 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal | 14.3 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 2400 kg (5291.09 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 100 kg (220.46 lbs.) |
| Length | 4752 mm (187.09 in.) |
| Width | 1938 mm (76.3 in.) |
| Height | 1621 mm (63.82 in.) |
| Wheelbase | 2864 mm (112.76 in.) |
| Front track | 1615 mm (63.58 in.) |
| Rear (Back) track | 1624 mm (63.94 in.) |
| Ride height (ground clearance) | 204 mm (8.03 in.) |
| Drag coefficient (Cd) | 0.33-0.35 |
| Minimum turning circle (turning diameter) | 12.1 m (39.7 ft.) |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
INTRODUCTION
The BMW X4 M40i (G02 LCI) launched in 2021 as a refreshed version of the second-generation X4, which debuted in 2018. Built on the BMW Cluster Architecture (CLAR) platform – specifically the UKL platform shared with models like the 3 Series – the X4 blends the practicality of an SUV with the sleeker profile of a coupe. The M40i trim level serves as a performance-focused variant, bridging the gap between the standard X4 models and the full-fledged X4 M. The LCI facelift brought subtle but significant updates to the exterior styling, interior technology, and powertrain refinement, solidifying the X4’s position in the competitive luxury compact SUV market.
Powertrain & Engine Architecture
At the heart of the X4 M40i lies the B58B30B inline-six engine, a 3.0-liter turbocharged powerplant. This engine benefits from BMW’s VALVETRONIC variable valve timing and Double VANOS variable camshaft timing systems, optimizing efficiency and performance across the rev range. The B58 utilizes direct fuel injection and a twin-scroll turbocharger, delivering 360 horsepower at 5200-6500 rpm and 500 Nm (368.78 lb.-ft.) of torque between 1900-5000 rpm. The “M40i” designation also incorporates a 48V mild-hybrid system. This system features an 11 hp electric motor integrated into the drivetrain, providing a small power boost during acceleration and enabling smoother start-stop operation. The engine is longitudinally mounted, driving all four wheels through BMW’s xDrive all-wheel-drive system.
The transmission is an 8-speed Steptronic automatic gearbox, known for its quick and smooth shifts. This transmission is programmed for both efficient cruising and responsive performance, with paddle shifters available for manual control. The xDrive system is rear-biased, prioritizing power delivery to the rear wheels for a more engaging driving experience, while seamlessly distributing torque to the front wheels when traction is needed.
Driving Characteristics
The X4 M40i delivers a noticeably more spirited driving experience compared to lower-powered X4 variants. The 360 hp engine provides strong acceleration, achieving 0-60 mph in approximately 4.7 seconds. The 8-speed automatic transmission is well-tuned, offering quick and precise shifts. The xDrive system provides excellent grip and stability in various driving conditions. While the X4’s higher center of gravity limits its ultimate cornering ability compared to a traditional sports car, the M40i’s chassis tuning and responsive steering contribute to a confident and engaging driving experience. The mild-hybrid system provides a subtle but noticeable boost during acceleration, enhancing responsiveness. Compared to the X4 M, the M40i offers a more comfortable ride and a less aggressive overall demeanor, making it a more practical choice for everyday driving.
Equipment & Trim Levels
The X4 M40i comes standard with a comprehensive list of features, including leather upholstery, power-adjustable front seats with memory function, a panoramic sunroof, and a premium sound system. The infotainment system features a 12.3-inch touchscreen display with BMW’s iDrive operating system, offering navigation, Apple CarPlay, and Android Auto compatibility. Standard safety features include automatic emergency braking, lane departure warning, and adaptive cruise control. Optional extras include upgraded leather upholstery, a head-up display, and a parking assistant system. The LCI facelift introduced updated interior trim options and enhanced connectivity features.
Chassis & Braking
The X4 M40i features a spring strut front suspension and an independent multi-link rear suspension. The suspension is tuned for a balance between comfort and handling, providing a relatively compliant ride while maintaining good body control. The M40i is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The braking system is assisted by ABS (Anti-lock Braking System), electronic brake-force distribution, and brake assist. The M40i typically features larger brake rotors and calipers compared to the base X4 models.
Market Reception & Comparison
The BMW X4 M40i was generally well-received by automotive critics, praised for its powerful engine, engaging driving dynamics, and luxurious interior. Reviewers noted that the M40i offered a compelling alternative to traditional SUVs, providing a sportier driving experience without sacrificing practicality. Compared to the X4 30i (the base engine option), the M40i offered significantly more performance and a more premium driving experience. Fuel economy was considered respectable for a performance SUV, although not class-leading. Reliability reports have been generally positive, with the B58 engine proving to be a robust and durable powerplant.
Legacy
The BMW X4 M40i (G02 LCI) has established itself as a popular choice in the luxury compact SUV segment. The B58 engine has gained a reputation for its reliability and tunability, making it a favorite among enthusiasts. On the used car market, the X4 M40i holds its value well, reflecting its strong performance and desirable features. The combination of performance, luxury, and practicality ensures that the X4 M40i will remain a sought-after vehicle for years to come.
