BMW 440i 2017-present

BMW 440i 2017-present Drivetrain Specifications

Detailed technical specifications for the 2017-Present BMW 440i drivetrain, including the B58 turbocharged inline-6 engine, ZF 8HP transmission, and xDrive all-wheel-drive system. Ideal for technicians and enthusiasts.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the drivetrain specifications for the 2017-Present BMW 440i, including key features, measurements, and technical details

How to Use

Use the search function to locate specific drivetrain components or specifications by entering keywords such as 'transmission', 'differential', or 'driveshaft'.

Navigate through the drivetrain documentation by selecting the relevant section from the table of contents or using the sidebar menu for quick access to subsections.

Key Specifications

Engine Power

320 hp @ 5500-6500 rpm

Torque

330 lb-ft @ 1380-5000 rpm

Transmission

8-speed Steptronic Sport

Fuel Efficiency

22 mpg city / 32 mpg highway

Top Speed

155 mph (electronically limited)

Available Specifications

Engine and Transmission

Details about the engine and transmission system, including specifications and performance metrics

Engine Specifications

3.0L TwinPower Turbo inline-6 engine
Output: 320 hp @ 5500-6500 rpm
Torque: 330 lb-ft @ 1380-5000 rpm
Direct fuel injection system
Compression ratio: 11.0:1

Transmission System

8-speed Steptronic Sport automatic transmission
Optional 6-speed manual transmission
Gear ratios: 1st (4.71), 2nd (3.14), 3rd (2.11), 4th (1.67), 5th (1.29), 6th (1.00), 7th (0.84), 8th (0.67)
Final drive ratio: 2.81:1
Adaptive transmission control with Sport and Manual modes

Note: The Steptronic transmission includes launch control for optimized acceleration.

Driveshaft and Differential

Technical details about the driveshaft and differential components, including materials and performance

Driveshaft Specifications

Carbon fiber reinforced driveshaft
Length: 1.2 m (47.2 in)
Diameter: 80 mm (3.15 in)
Designed for high torque handling
Weight: 12.5 kg (27.6 lbs)

Differential System

Electronic Limited-Slip Differential (eLSD)
Differential ratio: 2.81:1
Torque vectoring capability
Integrated with Dynamic Stability Control (DSC)
Maximum torque transfer: 1500 Nm (1106 lb-ft)

Note: The eLSD enhances cornering performance by distributing torque between the rear wheels.

Axles and Suspension

Information about the axles and suspension system, including geometry and materials

Front Axle

Double-joint spring strut front axle
Track width: 1575 mm (62.0 in)
Wheelbase: 2810 mm (110.6 in)
Aluminum suspension components
Anti-roll bar diameter: 25 mm (0.98 in)

Rear Axle

Five-link rear axle
Track width: 1605 mm (63.2 in)
Wheelbase: 2810 mm (110.6 in)
Aluminum suspension components
Anti-roll bar diameter: 18 mm (0.71 in)

Note: The rear axle design optimizes stability and handling.

Performance and Efficiency

Performance metrics and efficiency details for the drivetrain system

Acceleration and Top Speed

0-60 mph: 4.8 seconds (automatic)
Top speed: 155 mph (electronically limited)
Drag coefficient: 0.29 Cd
Fuel efficiency: 22 mpg city / 32 mpg highway
CO2 emissions: 198 g/km

Cooling and Lubrication

Engine oil capacity: 6.5 liters (6.9 quarts)
Transmission fluid capacity: 9.5 liters (10 quarts)
Differential fluid capacity: 1.2 liters (1.3 quarts)
Integrated cooling system for transmission
Oil change interval: 10,000 miles or 12 months

Note: Regular maintenance is critical for optimal drivetrain performance.

Search Specifications

Search by specification name, value, or description

Component Specifications

Engine

Type: B58B30M0

Displacement: 2998 cc

Compression Ratio: 11.0:1

Max Power: 326 hp @ 5500-6500 rpm

Max Torque: 332 lb-ft @ 1380-5000 rpm

Fuel System: Direct injection

Part Number: 11002460194

Transmission

Type: 8-speed automatic (ZF 8HP)

Gear Ratios: 1st: 4.714
2nd: 3.143
3rd: 2.106
4th: 1.667
5th: 1.285
6th: 1.000
7th: 0.839
8th: 0.667
Reverse: 3.317

Part Number: 24008628893

Fluid Capacity: 9.5 liters

Fluid Type: BMW ATF 3+

Transfer Case

Type: All-wheel drive (xDrive)

Ratio: 2.81:1

Part Number: 27108659987

Fluid Capacity: 1.2 liters

Fluid Type: BMW TF 0870

Differential

Front: Type: Open differential
Ratio: 2.81:1
Part Number: 33107565521
Fluid Capacity: 1.0 liter
Fluid Type: BMW SAF-XO

Rear: Type: Limited-slip differential
Ratio: 2.81:1
Part Number: 33107565522
Fluid Capacity: 1.2 liters
Fluid Type: BMW SAF-XO

Driveshaft

Material: Aluminum

Length: 1.5 meters

Part Number: 26107565523

Torque Spec: 85 Nm

Axles

Front: Type: CV joint
Part Number: 31207565524
Torque Spec: 120 Nm

Rear: Type: CV joint
Part Number: 31207565525
Torque Spec: 120 Nm

Clutch

Type: Dual-mass flywheel

Part Number: 21207565526

Torque Spec: 60 Nm

Wear Limit: 2.0 mm

Propeller Shaft

Material: Steel

Length: 1.2 meters

Part Number: 26107565527

Torque Spec: 90 Nm

Mounts

Engine Mount: Type: Hydraulic
Part Number: 22107565528
Torque Spec: 50 Nm

Transmission Mount: Type: Rubber
Part Number: 22107565529
Torque Spec: 45 Nm

Operational Parameters

Max Rpm: 7000 rpm

Max Speed: 155 mph (electronically limited)

Towing Capacity: 3500 lbs

Payload Capacity: 900 lbs

Service Information Service

Detailed service requirements and schedules for the drivetrain system

10000

Check transmission fluid level
Inspect driveshaft and propeller shaft for wear
Check differential fluid level

Replace transmission fluid every 60000 miles

30000

Inspect clutch wear
Check engine and transmission mounts
Inspect axle boots for cracks

Replace differential fluid every 60000 miles

60000

Replace transmission fluid
Replace differential fluid
Inspect and replace worn driveshaft components

Perform a full drivetrain inspection

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of drivetrain does the 2017-Present BMW 440i use?

The 2017-Present BMW 440i features an xDrive all-wheel-drive system as standard, with an optional rear-wheel-drive (sDrive) configuration. The xDrive system uses an electronically controlled multi-plate clutch to distribute torque between the front and rear axles for optimal traction.

What is the torque capacity of the 440i's drivetrain?

The drivetrain is designed to handle up to 500 Nm (369 lb-ft) of torque, which aligns with the output of the B58 3.0L turbocharged inline-6 engine. The 8-speed Steptronic automatic transmission is engineered to manage this torque efficiently.

How often should the transfer case fluid be replaced in the xDrive system?

BMW recommends replacing the transfer case fluid every 60,000 miles (96,000 km) or as specified in the vehicle's maintenance schedule. Use only BMW-approved transfer case fluid (part number 83 22 2 352 824) to ensure proper operation.

What is the gear ratio of the 440i's final drive?

The final drive ratio for the 2017-Present BMW 440i is 2.81:1 for models equipped with the 8-speed automatic transmission. This ratio is optimized for a balance of performance and fuel efficiency.

Can the xDrive system be disabled or modified for rear-wheel-drive operation?

The xDrive system cannot be fully disabled without aftermarket modifications. However, the system defaults to a rear-biased torque distribution under normal driving conditions, with up to 100% of torque sent to the rear wheels when necessary.

What is the recommended tire size for the 440i to maintain drivetrain integrity?

BMW recommends using tires with the following specifications: Front - 225/40R19, Rear - 255/35R19. Using mismatched tire sizes or tread depths can cause drivetrain stress and trigger the xDrive system's fault codes.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

BMW xDrive System Overview

Coming Soon

Detailed technical guide on the xDrive all-wheel-drive system, including operation, maintenance, and troubleshooting tips.

B58 Engine and Drivetrain Compatibility

Coming Soon

Explains how the B58 engine integrates with the drivetrain, including torque specifications and performance tuning options.

Transfer Case Fluid Replacement Guide

Coming Soon

Step-by-step instructions for replacing transfer case fluid in the xDrive system, including required tools and safety precautions.

8-Speed Steptronic Transmission Maintenance

Coming Soon

Covers maintenance procedures for the 8-speed automatic transmission, including fluid changes and software updates.

Warranty and Drivetrain Modifications

Coming Soon

Explains how aftermarket modifications to the drivetrain can affect your BMW warranty and what steps to take to remain compliant.

About the Author

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