BMW 745i 2020-present

BMW 745i 2020-present Suspension Specifications

Detailed technical specifications for the suspension system of the 2020-Present BMW 745i, including front and rear suspension components, alignment settings, and electronic control systems.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the suspension specifications for the 2020-Present BMW 745i, including key features, measurements, and technical details. This guide covers the advanced suspension system designed for optimal comfort, handling, and performance.

How to Use

Use the search function to locate specific suspension components or specifications by entering keywords such as 'front suspension', 'rear suspension', or 'adaptive air suspension'.

Navigate through the documentation using the table of contents or section headers. Each section is organized by major suspension components and subsystems.

Key Specifications

Front Track Width

1620 mm

Rear Track Width

1640 mm

Ride Height Range

140 mm to 180 mm

Maximum Damping Force

4500 N

Tire Pressure (Front/Rear)

2.4 bar / 2.6 bar

Available Specifications

Front Suspension

Details of the front suspension system, including the double-wishbone design, adaptive air suspension, and key measurements.

Double-Wishbone Design

Independent double-wishbone front suspension for precise handling
Upper and lower control arms made of lightweight aluminum alloy
Wheel camber angle: -0.5° to -1.5° (adjustable)
Kingpin inclination: 8.5°
Track width: 1620 mm

Adaptive Air Suspension

Electronically controlled air springs for dynamic ride height adjustment
Ride height range: 140 mm to 180 mm
Damping force adjustment in 0.02-second intervals
Integrated with Dynamic Damper Control (DDC)
Note: Requires regular calibration using BMW diagnostic tools

Note: The adaptive air suspension system is optional and part of the Executive Drive Pro package.

Rear Suspension

Technical details of the rear suspension system, including the multi-link design and integration with the adaptive air suspension.

Multi-Link Design

Five-link rear suspension for enhanced stability and comfort
Trailing arms and toe links made of forged steel
Wheel camber angle: -1.2° to -2.0° (adjustable)
Track width: 1640 mm
Toe-in setting: 0.1° to 0.3°

Adaptive Air Suspension Integration

Rear air springs with independent level control
Ride height adjustment synchronized with front suspension
Load-leveling function for up to 1000 kg payload
Integrated with Dynamic Damper Control (DDC)
Note: System recalibration required after component replacement

Dynamic Damper Control (DDC)

Overview of the Dynamic Damper Control system, which adjusts damping forces in real-time for optimal ride comfort and handling.

System Operation

Continuously variable damping force adjustment
Four driving modes: Comfort, Sport, Sport+, and Adaptive
Adjustment range: 0% to 100% damping force
Response time: 0.02 seconds per adjustment
Integrated with BMW Driving Experience Control

Technical Specifications

Maximum damping force: 4500 N
Minimum damping force: 500 N
Operating temperature range: -40°C to 120°C
Power consumption: 12V, 5A max
Note: Requires BMW ISTA software for diagnostics and calibration

Wheel and Tire Specifications

Details of the wheel and tire setup, including sizes, pressures, and alignment specifications.

Standard Wheel and Tire Setup

Front wheel size: 8.5J x 20 (ET30)
Rear wheel size: 9.5J x 20 (ET44)
Front tire size: 245/40 R20
Rear tire size: 275/35 R20
Tire pressure: 2.4 bar (front), 2.6 bar (rear)

Alignment Specifications

Front toe: 0.10° ± 0.05°
Rear toe: 0.15° ± 0.05°
Front caster: 7.5° ± 0.5°
Rear camber: -1.5° ± 0.3°
Note: Alignment must be performed using BMW-approved equipment

Search Specifications

Search by specification name, value, or description

Component Specifications

Front Suspension

Type: Double wishbone with air springs

Spring Rate: 180 N/mm

Shock ABSorber Type: Adaptive air suspension

Stabilizer Bar Diameter: 28 mm

Bushings Material: Synthetic rubber with aluminum housing

Part Numbers: Air Spring: 37116793821
Shock ABSorber: 37116793822
Stabilizer Bar: 31357846673

Rear Suspension

Type: Multi-link with air springs

Spring Rate: 160 N/mm

Shock ABSorber Type: Adaptive air suspension

Stabilizer Bar Diameter: 24 mm

Bushings Material: Synthetic rubber with aluminum housing

Part Numbers: Air Spring: 37116793823
Shock ABSorber: 37116793824
Stabilizer Bar: 31357846674

Air Suspension System

Compressor Type: Single-piston electric compressor

Pressure Range: 8-16 bar

Air Spring Volume: 2.5 liters per spring

Control Unit Part Number: 37116793825

Operational Temperature Range: -40°C to 85°C

Adaptive Damping System

Damping Modes

Comfort
Sport
Sport+

Response Time: 20 ms

Sensor Types

Acceleration sensors
Position sensors

Control Unit Part Number: 37116793826

Operational Limits: Max Compression Force: 5000 N
Max Rebound Force: 4500 N

Wheel Alignment

Front Camber: -0.5° to -1.0°

Rear Camber: -1.5° to -2.0°

Front Toe: 0.10° to 0.20°

Rear Toe: 0.15° to 0.25°

Caster Angle: 7.5° to 8.5°

Tolerance: ±0.2°

Suspension Bushings

Front Lower Control Arm Bushing: Material: Hydro rubber
Durometer: 70 Shore A
Part Number: 31126793827

Rear Trailing Arm Bushing: Material: Hydro rubber
Durometer: 65 Shore A
Part Number: 33326793828

Suspension Mounts

Front Strut Mount: Material: Aluminum with rubber isolator
Part Number: 31306793829
Torque Spec: 90 Nm

Rear Shock Mount: Material: Aluminum with rubber isolator
Part Number: 33506793830
Torque Spec: 85 Nm

Suspension Diagnostics

Fault Codes

C1210 - Air suspension compressor malfunction
C1211 - Air suspension valve block fault
C1212 - Air spring pressure sensor fault

Diagnostic Tool: BMW ISTA

Test Procedures

Check air compressor pressure output
Inspect air spring leaks
Verify sensor calibration

Suspension Maintenance

inspection Intervals

Miles: 15000, Months: 12, Items: Inspect air springs for leaks,Check shock absorber operation,Verify alignment settings

Replacement intervals

Miles: 60000, Months: 60, Items: Replace air suspension bushings,Inspect and replace worn mounts

Suspension Safety

Max Load Front: 1200 kg

Max Load Rear: 1300 kg

Max Vehicle Weight: 2500 kg

Warning Notes

Do not operate vehicle with damaged air springs
Ensure proper alignment after suspension repairs
Use only BMW-approved replacement parts

Service Information Service

Detailed service requirements and schedules for the suspension system

15000

Inspect air suspension system for leaks
Check adaptive damping system operation
Verify wheel alignment settings

Use BMW ISTA for system diagnostics

60000

Replace suspension bushings
Inspect and replace worn mounts
Check and replace air springs if necessary

Follow torque specifications for all fasteners

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of suspension system is used in the 2020-Present BMW 745I?

The BMW 745I utilizes a sophisticated adaptive suspension system, featuring electronically controlled dampers and air springs. This system adjusts automatically to road conditions, ensuring optimal comfort and stability.

What is the recommended maintenance interval for the suspension components?

BMW recommends inspecting the suspension system every 12,000 miles or annually. Key components like dampers, air springs, and linkage should be checked for wear and tear. Regular maintenance ensures longevity and performance.

How does the adaptive suspension system adjust to different driving conditions?

The adaptive suspension system uses sensors to monitor road conditions and vehicle dynamics. It adjusts the damper stiffness and air spring pressure in real-time, providing optimal handling and comfort for various driving scenarios.

What are the specifications for the air springs in the BMW 745I suspension?

The air springs in the BMW 745I have a pressure range of 50-200 psi, adjustable via the vehicle's electronic control system. They provide a load capacity of up to 3,500 lbs per axle, ensuring robust support and ride comfort.

Can the suspension settings be manually adjusted by the driver?

Yes, the BMW 745I offers manual adjustment options through the vehicle's onboard system. Drivers can select between Comfort, Sport, and Dynamic modes, each altering the suspension settings for different driving preferences.

What safety warnings should be considered when servicing the suspension?

Always ensure the vehicle is securely lifted using appropriate equipment. Disconnect the electronic control system before servicing to prevent accidental adjustments. Only use genuine BMW parts to maintain system integrity and warranty compliance.

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 Adaptive Suspension System Overview

Coming Soon

Detailed technical overview of the adaptive suspension system used in the BMW 745I, including its components and functionality.

Suspension Maintenance Guide

Coming Soon

Comprehensive guide on maintaining and inspecting the suspension components of the BMW 745I, with step-by-step procedures.

Electronic Damper Control Manual

Coming Soon

Technical manual for the electronically controlled dampers in the BMW 745I, covering diagnostics and adjustment procedures.

Air Spring Specifications and Service

Coming Soon

In-depth resource on the air spring specifications, service procedures, and safety precautions for the BMW 745I.

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