BMW 840i 2018-present Exhaust Specifications
Detailed technical specifications for the 2018-Present BMW 840i exhaust system, covering components, materials, dimensions, and performance. Ideal for technicians and enthusiasts.
Overview Specifications
Comprehensive description of the exhaust specifications for the 2018-Present BMW 840i, including key features, measurements, and technical details. This section provides detailed insights into the exhaust system's design, components, and performance characteristics.
How to Use
Use the search function to locate specific exhaust specifications by entering keywords such as 'catalytic converter,' 'muffler,' or 'exhaust pipe diameter.'
Navigate through the exhaust documentation sections using the table of contents or by scrolling through the major sections and subsections.
Key Specifications
Exhaust Pipe Diameter
70 mm (2.75 in)
Backpressure
0.8 bar (11.6 psi)
Sound Level at Full Throttle
85 dB
Catalytic Converter Lifespan
100,000 miles (160,000 km)
Available Specifications
Exhaust System Overview
This section provides an overview of the BMW 840i's exhaust system, including its design, materials, and key components.
Exhaust System Overview
This section provides an overview of the BMW 840i's exhaust system, including its design, materials, and key components.
Exhaust System Design
- Dual exhaust system with integrated mufflers
- Stainless steel construction for durability and corrosion resistance
- Optimized for performance and sound tuning
- Exhaust pipe diameter: 70 mm (2.75 in)
- Electronically controlled exhaust flaps for sound modulation
Key Components
- Twin-scroll turbocharger for efficient exhaust gas flow
- High-performance catalytic converters for emissions control
- Resonators for sound dampening
- Exhaust tips with chrome finish for aesthetic appeal
Note: The exhaust system is designed to meet Euro 6 emissions standards.
Exhaust Performance Specifications
This section details the performance-related specifications of the BMW 840i's exhaust system, including flow rates, backpressure, and sound levels.
Exhaust Performance Specifications
This section details the performance-related specifications of the BMW 840i's exhaust system, including flow rates, backpressure, and sound levels.
Flow and Backpressure
- Exhaust gas flow rate: 450 liters per second (at full load)
- Backpressure: 0.8 bar (11.6 psi) maximum
- Optimized for minimal flow restriction
- Turbocharger integration reduces backpressure
Sound Characteristics
- Sound level at idle: 45 dB
- Sound level at full throttle: 85 dB
- Active Sound Design for customizable exhaust note
- Exhaust flaps adjust sound based on driving mode
Note: Sound levels are measured at a distance of 1 meter from the exhaust tips.
Exhaust Maintenance and Service
This section covers maintenance requirements, service intervals, and troubleshooting tips for the BMW 840i's exhaust system.
Exhaust Maintenance and Service
This section covers maintenance requirements, service intervals, and troubleshooting tips for the BMW 840i's exhaust system.
Maintenance Requirements
- Inspect exhaust system every 15,000 miles (24,000 km)
- Check for leaks, cracks, or corrosion
- Replace catalytic converters every 100,000 miles (160,000 km)
- Clean exhaust tips regularly to prevent buildup
Troubleshooting Common Issues
- Excessive noise: Check for leaks or damaged mufflers
- Reduced performance: Inspect catalytic converters for clogging
- Rattling sounds: Tighten or replace loose components
- Check engine light: Diagnose with OBD-II scanner for exhaust-related codes
Note: Always use OEM parts for replacements to ensure compatibility and performance.
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Component Specifications
General Specifications
- System Type
- Twin-pipe exhaust system with dual tailpipes
- Material
- Stainless steel
- Weight
- 22.5 kg
- Emission Standard
- Euro 6d-TEMP
- Part Number
- 18307654321
Exhaust Manifold
- Material
- Cast iron with heat-resistant coating
- Bolt Torque
- 25 Nm + 90°
- Gasket Part Number
- 11627586943
- Heat Shield Material
- Aluminized steel
- Heat Shield Thickness
- 1.5 mm
Catalytic Converter
- Type
- Close-coupled catalytic converter
- Material
- Ceramic substrate with platinum-rhodium coating
- Cell Density
- 600 cells per square inch
- Part Number
- 18307654322
- Operating Temperature Range
- 400°C to 800°C
- Replacement interval
- 120,000 miles or 10 years
Resonator
- Type
- Center-mounted resonator
- Material
- Stainless steel
- Length
- 450 mm
- Diameter
- 100 mm
- Part Number
- 18307654323
- Function
- Reduces exhaust noise and drone
Muffler
- Type
- Dual-chamber muffler
- Material
- Stainless steel with acoustic insulation
- Length
- 600 mm
- Diameter
- 120 mm
- Part Number
- 18307654324
- Noise Reduction
- Up to 30 dB
Tailpipes
- Material
- Polished stainless steel
- Diameter
- 90 mm
- Finish
- Chrome-plated
- Part Number
- 18307654325
- Alignment Tolerance
- ±2 mm
Oxygen Sensors
- Type
- Wideband lambda sensors
- Location
-
- Pre-catalytic converter
- Post-catalytic converter
- Part Number
-
- 11787586944
- 11787586945
- Operating Temperature
- -40°C to 900°C
- Replacement interval
- 100,000 miles
Exhaust Flaps
- Type
- Electronically controlled exhaust flaps
- Material
- Stainless steel
- Actuator Part Number
- 18307654326
- Control Mode
-
- Comfort
- Sport
- Operating Temperature Limit
- 600°C
Mounting System
- Rubber Mounts
- Quantity: 4Part Number: 18307654327Durometer: 70 Shore ALoad Capacity: 15 kg each
- Bracket Material
- Galvanized steel
- Bracket Torque Spec
- 40 Nm
Diagnostic Specifications
- Fault Codes
-
- P0420
- P0430
- P0135
- P0141
- Diagnostic Tool
- BMW ISTA
- Sensor Resistance Range
- 5-20 ohms
- Exhaust Backpressure Limit
- 0.5 bar at 3000 rpm
Service Information Service
Detailed service requirements and schedules for the exhaust system
- Inspect exhaust system for leaks and damage
- Check oxygen sensor functionality
- Verify exhaust flap operation
Replace gaskets if any leaks are detected
- Inspect catalytic converter for efficiency
- Check resonator and muffler for corrosion
- Tighten all exhaust mounting bolts
Use torque wrench for bolt tightening
- Replace oxygen sensors
- Inspect and replace exhaust mounts if necessary
- Check exhaust backpressure
Follow BMW ISTA diagnostic procedures
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the exhaust system configuration for the 2018-Present BMW 840i?
What is the exhaust system configuration for the 2018-Present BMW 840i?
The BMW 840i features a dual-branch exhaust system with two tailpipes, each measuring 90mm in diameter. It includes a rear silencer and an electronically controlled exhaust flap for optimized sound and performance.
Q2 What material is used in the exhaust system of the BMW 840i?
What material is used in the exhaust system of the BMW 840i?
The exhaust system is constructed from high-quality stainless steel, ensuring durability and resistance to corrosion. The tailpipes are chrome-plated for a premium finish.
Q3 How does the exhaust flap system work in the BMW 840i?
How does the exhaust flap system work in the BMW 840i?
The exhaust flap is electronically controlled and adjusts based on driving conditions. It opens during dynamic driving to enhance exhaust flow and sound, and closes during low-load conditions to reduce noise and improve fuel efficiency.
Q4 What are the emissions standards met by the BMW 840i exhaust system?
What are the emissions standards met by the BMW 840i exhaust system?
The exhaust system complies with Euro 6d-TEMP emissions standards, incorporating a catalytic converter and particulate filter to minimize harmful emissions.
Q5 Can the exhaust system be upgraded or modified?
Can the exhaust system be upgraded or modified?
Yes, BMW offers M Performance exhaust systems as an upgrade, providing enhanced sound and performance. However, modifications must comply with local emissions regulations and may affect the vehicle's warranty.
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 Exhaust System Technical Manual
Coming SoonDetailed technical documentation covering the exhaust system's design, components, and maintenance procedures.
M Performance Exhaust Upgrade Guide
Coming SoonStep-by-step guide for upgrading to the M Performance exhaust system, including installation instructions and compatibility details.
Exhaust System Maintenance Best Practices
Coming SoonComprehensive guide on maintaining the exhaust system, including inspection intervals, cleaning tips, and common issues.
BMW Genuine Parts Catalog
Coming SoonOfficial catalog for genuine BMW exhaust components, ensuring compatibility and warranty compliance.
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