BMW 840i 2018-present

BMW 840i 2018-present Suspension Specifications

Comprehensive technical documentation for the suspension system of the 2018-Present BMW 840i, including detailed specifications for front and rear suspension components, alignment settings, and adaptive suspension features.

Updated Oct 14, 2023

Overview Specifications

Comprehensive description of the suspension specifications for the 2018-Present BMW 840I, including key features, measurements, and technical details

How to Use

Use the search function to locate specific suspension specifications by entering keywords such as 'spring rate', 'damping force', or 'ride height'.

Navigate through the suspension documentation sections using the table of contents or by scrolling through the document. Each major section is clearly labeled for easy access.

Key Specifications

Front Spring Rate

28 N/mm

Rear Spring Rate

32 N/mm

Front Anti-Roll Bar Diameter

24 mm

Rear Anti-Roll Bar Diameter

22 mm

Turning Circle

12.4 meters

Available Specifications

Front Suspension

Detailed information about the front suspension system, including components, measurements, and technical specifications

Double Wishbone Suspension

Double wishbone design with forged aluminum components
Spring rate: 28 N/mm
Damping force: 1,200 N at 0.3 m/s
Ride height: 140 mm (adjustable via adaptive suspension)
Anti-roll bar diameter: 24 mm

Adaptive Damping System

Electronically controlled dampers with Comfort, Sport, and Sport+ modes
Damping adjustment range: ±30% from baseline
Response time: 10 ms for mode changes
Integrated with Dynamic Stability Control (DSC)
Note: Requires regular calibration for optimal performance

Note: Adaptive damping system is optional and part of the Dynamic Handling Package.

Rear Suspension

Technical details and specifications for the rear suspension system of the BMW 840I

Multi-Link Suspension

Five-link rear suspension with aluminum arms
Spring rate: 32 N/mm
Damping force: 1,500 N at 0.3 m/s
Ride height: 145 mm (adjustable via adaptive suspension)
Anti-roll bar diameter: 22 mm

Air Suspension (Optional)

Self-leveling air suspension with load compensation
Air spring pressure range: 8-12 bar
Maximum load capacity: 500 kg
Integrated with rear axle steering system
Note: Air suspension is part of the Executive Package

Note: Air suspension provides enhanced comfort and load-carrying capabilities.

Steering System

Details about the steering system integrated with the suspension for optimal handling

Electric Power Steering

Rack-and-pinion steering with electric assist
Steering ratio: 15.1:1
Turning circle: 12.4 meters
Integrated with rear-wheel steering (optional)
Steering effort adjustable via driving modes

Rear-Wheel Steering (Optional)

Rear-wheel steering angle: ±2.5 degrees
Speed-dependent steering adjustment
Reduces turning circle by 10% at low speeds
Enhances stability at high speeds
Note: Requires Dynamic Handling Package

Note: Rear-wheel steering improves maneuverability and stability.

Wheels and Tires

Specifications for wheels and tires that complement the suspension system

Standard Wheel and Tire Setup

Front wheel size: 19x8.5 inches
Rear wheel size: 19x9.5 inches
Front tire size: 245/40 R19
Rear tire size: 275/35 R19
Tire pressure monitoring system (TPMS) standard

Optional Performance Setup

Front wheel size: 20x9 inches
Rear wheel size: 20x10 inches
Front tire size: 255/35 R20
Rear tire size: 285/30 R20
Run-flat tires available as an option

Note: Performance setup enhances grip and handling but may reduce ride comfort.

Search Specifications

Search by specification name, value, or description

Component Specifications

Front Suspension

Type: Double wishbone

Spring Type: Coil spring

Shock ABSorber Type: Gas-filled

Stabilizer Bar Diameter: 25.5 mm

Wheel Alignment: Camber: -0.5 to 0.5 degrees
Toe: 0.1 to 0.3 degrees
Caster: 7.0 to 7.5 degrees

Part Numbers: Spring: 31337851001
Shock ABSorber: 31337851002
Stabilizer Bar: 31337851003

Rear Suspension

Type: Multi-link

Spring Type: Coil spring

Shock ABSorber Type: Gas-filled

Stabilizer Bar Diameter: 22.5 mm

Wheel Alignment: Camber: -1.5 to -0.5 degrees
Toe: 0.1 to 0.3 degrees

Part Numbers: Spring: 33537851001
Shock ABSorber: 33537851002
Stabilizer Bar: 33537851003

Adaptive Suspension

System Name: Adaptive M Suspension

Adjustment Range: Comfort to Sport+

Response Time: 100 ms

Part Numbers: Control Unit: 37107851001
Sensor Set: 37107851002

Air Suspension

System Name: Integral Active Steering

Pressure Range: 8 to 12 bar

Compressor Power: 400 W

Part Numbers: Air Spring: 37207851001
Compressor: 37207851002

Suspension Bushings

Material: Rubber with polyurethane coating

Front Bushing Part Number: 33307851001

Rear Bushing Part Number: 33307851002

Replacement interval: 60,000 miles or 5 years

Suspension Mounts

Front Mount Part Number: 31307851001

Rear Mount Part Number: 33507851001

Torque Specifications: Front Mount Bolts: 70 Nm
Rear Mount Bolts: 80 Nm

Suspension Links

Front Link Part Number: 31307851002

Rear Link Part Number: 33507851002

Torque Specifications: Front Link Bolts: 50 Nm
Rear Link Bolts: 60 Nm

Suspension Diagnostics

Fault Codes

480A - Front suspension sensor fault
480B - Rear suspension sensor fault
480C - Adaptive suspension control unit fault

Diagnostic Tool: BMW ISTA

Diagnostic Procedures

Check sensor connections
Perform system reset
Update control unit software

Suspension Maintenance

inspection Interval: Every 15,000 miles or 12 months

Lubrication Points

Front suspension bushings
Rear suspension bushings
Stabilizer bar links

Torque Check interval: Every 30,000 miles or 24 months

Suspension Limits

Maximum Load: 550 kg

Maximum Speed With Load: 250 km/h

Maximum Offroad Clearance: 150 mm

Service Information Service

Detailed service requirements and schedules for the suspension system

15,000 miles

12 months

Inspect suspension components for wear
Check and adjust wheel alignment
Lubricate suspension bushings

Ensure all bolts are torqued to specification

30,000 miles

24 months

Replace suspension bushings if necessary
Check and replace shock absorbers if needed
Inspect and replace stabilizer bar links

Use only BMW-approved parts for replacements

60,000 miles

60 months

Replace all suspension mounts
Inspect and replace suspension links
Perform full suspension system diagnostic

Reset adaptive suspension system after replacement

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of suspension system does the 2018-Present BMW 840i use?

The 2018-Present BMW 840i features a double-wishbone front suspension and a multi-link rear suspension. This setup is designed to provide a balance between sporty handling and ride comfort. The system includes adaptive dampers as part of the optional Dynamic Damper Control, which adjusts damping force based on driving conditions.

What is the ground clearance of the BMW 840i?

The ground clearance of the BMW 840i is approximately 120 mm (4.7 inches). This measurement ensures a low center of gravity for improved handling while maintaining sufficient clearance for most driving conditions.

Can the suspension be adjusted for different driving modes?

Yes, the BMW 840i offers an optional Adaptive M Suspension with Dynamic Damper Control. This system allows drivers to select between Comfort, Sport, and Eco Pro modes, adjusting the suspension stiffness and damping characteristics to suit the driving style and road conditions.

What is the recommended tire pressure for the BMW 840i?

The recommended tire pressure for the BMW 840i varies based on load and driving conditions. For normal driving, the front tires should be inflated to 32 psi (2.2 bar) and the rear tires to 35 psi (2.4 bar). Always refer to the tire pressure label on the driver's side door jamb for specific recommendations.

How often should the suspension components be inspected?

BMW recommends inspecting the suspension components every 10,000 miles or during routine maintenance intervals. Key components such as bushings, ball joints, and shock absorbers should be checked for wear and damage to ensure optimal performance and safety.

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 840i Suspension System Overview

Coming Soon

A detailed guide to the suspension system, including components, functions, and maintenance tips.

Dynamic Damper Control Setup Guide

Coming Soon

Learn how to configure and optimize the Adaptive M Suspension with Dynamic Damper Control for different driving modes.

Suspension Maintenance Checklist

Coming Soon

A comprehensive checklist for inspecting and maintaining the suspension system to ensure longevity and performance.

Genuine BMW Suspension Parts Catalog

Coming Soon

Access the official catalog of genuine BMW suspension components for the 840i, ensuring compatibility and quality.

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