Audi Audi A8 2010-2017 AL551 Transmission Specifications
Comprehensive technical specifications and operational details for the AL551 8-speed automatic transmission used in the 2010-2017 Audi A8. This document covers gear ratios, torque capacity, fluid specifications, shift logic, and diagnostic codes specific to the AL551 transmission system.
AL551 Transmission Specifications Overview Specifications
This document provides a comprehensive overview of the AL551 transmission specifications for the 2010-2017 Audi A8. It includes detailed technical information, performance metrics, and maintenance guidelines. Use this guide to understand the transmission's design, operation, and service requirements. Navigate through the sections to find specific information or refer to the quick reference section for key specifications.
How to Use
To find specific information, use the search functionality (Ctrl+F or Cmd+F) to locate key terms within the document. Enter relevant keywords related to the AL551 transmission to quickly access the desired section or detail.
Navigate through the document by scrolling through the sections or using the table of contents. Each section is organized into subsections with detailed technical points. Use the quick reference section for a concise overview of key specifications.
Key Specifications
Transmission Type
8-speed dual-clutch automatic
Number of Gears
8
Gear Ratio Spread
4.71:1 to 0.58:1
Max Torque Capacity
369 lb-ft
Weight
Approx. 150 lbs
Available Specifications
Transmission Overview
This section provides a general overview of the AL551 transmission, including its type, key features, and application in the 2010-2017 Audi A8. It covers the basic architecture and functionality of the transmission.
Transmission Overview
This section provides a general overview of the AL551 transmission, including its type, key features, and application in the 2010-2017 Audi A8. It covers the basic architecture and functionality of the transmission.
Transmission Type
- 8-speed automatic transmission
- Dual-clutch design
- Rear-wheel drive (RWD) configuration
- Optional all-wheel drive (AWD) capability
- Torque converter with lock-up clutch
Gear Ratios
- 1st gear: 4.71
- 2nd gear: 2.84
- 3rd gear: 1.91
- 4th gear: 1.37
- 5th gear: 1.00
- 6th gear: 0.81
- 7th gear: 0.69
- 8th gear: 0.58
- Reverse gear: 3.28
Clutch Packs
- Multiple clutch packs for smooth gear transitions
- Hydraulic actuation system
- Electronic control unit (ECU) for precise shifting
- Adaptive shift strategy based on driving conditions
- Overlapping clutches for seamless torque delivery
Torque Converter
- Lock-up torque converter for improved fuel efficiency
- Multiple friction plates for increased durability
- Electronic controls for optimal engagement
- Cooling system integrated into the transmission
- Stall speed torque multiplication for better low-end performance
Design and Components
This section delves into the detailed design and components of the AL551 transmission, including the transmission housing, valve body, and other critical components.
Design and Components
This section delves into the detailed design and components of the AL551 transmission, including the transmission housing, valve body, and other critical components.
Transmission Housing
- Aluminum alloy construction for reduced weight
- Rigid design for improved stability and durability
- Integrated mounting points for engine and suspension
- Cooling channels for heat management
- Sealed design to prevent fluid contamination
Valve Body
- Solenoid-controlled hydraulic system
- Precision-machined hydraulic passages
- Adaptive pressure control for smooth shifting
- Integrated pressure sensors for real-time monitoring
- Fail-safe default mode for emergency operation
Sensors and Electronics
- Transmission speed sensor for gear position detection
- Turbocharger boost pressure sensor
- Engine speed and torque sensors
- Transmission fluid temperature sensor
- Accelerator pedal position sensor
Cooling System
- Dedicated transmission cooler integrated into the radiator
- Electronic cooling fan for improved heat dissipation
- Cooling lines made of high-temperature resistant material
- Thermostat-controlled cooling system
- Warning system for high transmission temperature
Performance Specifications
This section outlines the performance specifications of the AL551 transmission, including acceleration, fuel efficiency, and torque capacity.
Performance Specifications
This section outlines the performance specifications of the AL551 transmission, including acceleration, fuel efficiency, and torque capacity.
Acceleration
- 0-60 mph in 5.5 seconds (base model)
- 0-60 mph in 4.7 seconds (S8 model)
- Quarter-mile time: 13.8 seconds (base model)
- Quarter-mile time: 13.2 seconds (S8 model)
- Top speed: 155 mph (electronically limited)
Fuel Efficiency
- EPA estimated 19 mpg combined (city/highway)
- Up to 24 mpg highway driving
- Up to 15 mpg city driving
- Optimized gear ratios for improved fuel economy
- Automatic start/stop technology for reduced fuel consumption
Torque Capacity
- Maximum torque capacity: 369 lb-ft
- Optimized torque delivery across all gears
- Smooth torque transition during shifting
- Adaptive torque control for varying driving conditions
- Torque vectoring capability with AWD models
Shift Speed
- Fast shifting times in manual mode
- Adaptive shift logic for sport or comfort modes
- Paddle-shift capability for manual control
- Throttle-blip downshifts for smoother deceleration
- Pre-programmed shift patterns for optimal performance
Maintenance and Service
This section provides information on the maintenance and service requirements for the AL551 transmission, including fluid changes, filter replacements, and inspection intervals.
Maintenance and Service
This section provides information on the maintenance and service requirements for the AL551 transmission, including fluid changes, filter replacements, and inspection intervals.
Service Intervals
- Transmission fluid change every 30,000 miles
- Filter replacement every 60,000 miles
- Inspection of transmission mounts every 15,000 miles
- Software updates as required by Audi
- Visual inspection of transmission components every 30,000 miles
Transmission Fluid
- Use Audi-approved ATF (Automatic Transmission Fluid)
- Fluid capacity: approximately 3.5 quarts
- Fluid change procedure requires specialized tools
- Fluid level check procedure after refill
- Disposal of used fluid must follow environmental regulations
Filter Replacement
- Transmission pan gasket replacement recommended with filter
- Use only genuine Audi transmission filters
- Proper torque specification for pan bolts
- Inspection of the transmission pan for debris
- Resetting the service indicator after replacement
Inspection Points
- Check transmission mounts for wear or damage
- Inspect cooling lines for leaks or corrosion
- Verify proper operation of the torque converter
- Check the condition of the drive belts
- Inspect the transmission housing for any signs of damage
Troubleshooting and Repair
This section provides guidance on common issues, diagnostic procedures, and repair steps for the AL551 transmission.
Troubleshooting and Repair
This section provides guidance on common issues, diagnostic procedures, and repair steps for the AL551 transmission.
Common Issues
- Slipping or hesitation between gears
- Harsh or abrupt shifting
- Transmission fluid leaks
- Overheating transmission
- Faulty solenoid or sensor issues
- Software calibration issues
Diagnostic Tools
- Audi-specific diagnostic tool (VAG-COM)
- Transmission control module (TCM) reset procedure
- Live data monitoring for sensor readings
- Fault code reading and interpretation
- Specialized pressure test kit for hydraulic system
- Throttle body alignment procedure
Repair Procedures
- Replacing the torque converter
- Rebuilding the valve body
- Replacing the transmission pan gasket
- Updating the TCM software
- Replacing worn clutch packs
- Fixing or replacing damaged solenoids
Replacement Costs
- Transmission fluid change: $200-$300
- Filter replacement: $100-$200
- Torque converter replacement: $500-$700
- Solenoid pack replacement: $300-$500
- Complete transmission overhaul: $2,000-$3,000
- Replacement transmission unit: $4,000-$6,000
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Transmission Specifications
Overview
- Type
- 8-speed automatic transmission
- Configuration
- Torque converter automatic
- Platform
- Longitudinal
- Manufacturer
- ZF Friedrichshafen
- Model
- AL551
Dimensions
- Length
- 23.7 inches (601 mm)
- Width
- 16.1 inches (409 mm)
- Height
- 12.2 inches (310 mm)
- Weight
- Approx. 265 lbs (120 kg)
- Torque Capacity
- 369 lb-ft (500 Nm)
- Max Speed
- 155 mph (250 km/h)
Materials
- Transmission Casing
- Aluminum alloy
- Gear Sets
- High-strength steel
- Bearings
- Roller-type steel bearings
- Clutch Packs
- Organic friction material
- Seals
- High-temperature rubber
Features
- Adaptive Shifting
-
- Dynamic shifting based on driving conditions
- Torque converter lockup
- Manual shift mode
- Thermal management system
- Fuel efficiency optimization
- DriverModes
-
- Comfort Mode
- Sport Mode
- Manual Mode
- AdditionalFeatures
-
- Predictive shifting
- Shift paddles
- Cruise control integration
Safety Features
- FailSafe
- Fail-safe mode in case of system failure
- Thermal Protection
- Overheating protection system
- Monitoring System
-
- Transmission temperature monitoring
- Fluid level monitoring
- Pressure monitoring
Comfort Features
- Noise Reduction
-
- Isolated mounting
- Sound-dampening materials
- Smooth Operation
- Optimized gear transitions
- Creep Function
- Low-speed maneuvering assistance
- Start Stop
- Compatible with start-stop technology
Accessories
- Transmission Cooler
- Optional heavy-duty cooler
- Filter Kit
- Serviceable transmission filter
- Software
- Reflash capability for performance tuning
Maintenance
- Service interval
- First service at 30,000 miles (48,000 km), every 30,000 miles thereafter
- Service Items
-
- Transmission fluid change
- Filter replacement
- Inspection of cooler lines
- Software update check
- Clutch pack inspection
- Notes
- Use synthetic transmission fluid only
Warranty
- Basic
- Miles: 48,000 milesYears: 4 yearsCoverage: Parts and labor
- Powertrain
- Miles: 70,000 milesYears: 5 yearsCoverage: Transmission components
- Corrosion
- Miles: UnlimitedYears: 12 yearsCoverage: Perforation
- Roadside Assistance
- Miles: UnlimitedYears: 4 yearsCoverage: 24/7 service
Production Details
- Manufacturer info
- ZF Friedrichshafen AG
- Manufacturing Process
-
- CNC machining
- Heat treatment
- Assembly
- Testing
- Quality Control
- inspection: End-of-line testingCertifications: ISO/TS 16949Standards: OEM specifications
- Sustainability Practices
- Recyclable materials used
- Production Metrics
- Over 1 million units produced
Service Information for AL551 Transmission Service
Maintenance and service requirements specific to the AL551 transmission
- Transmission fluid change
- Replace transmission filter
- Inspect cooler lines
- Check software version
- Inspect clutch packs
Use synthetic transmission fluid only. Inspect for leaks.
- Inspect torque converter
- Check transmission mounts
- Verify shift solenoid operation
- Inspect wiring harness
- Check for software updates
Special tools required for solenoid testing.
- Major transmission service
- Overhaul if necessary
- Replace all seals and gaskets
- Flush and replace coolant
- Performance test
Critical to use OEM parts. Requires specialized tools and expertise.
Common Questions
Find answers to common questions about torque specifications
Q1 What is the torque capacity of the AL551 transmission in the 2010-2017 Audi A8?
What is the torque capacity of the AL551 transmission in the 2010-2017 Audi A8?
The AL551 transmission, also known as the 8-speed Tiptronic, has a torque capacity of up to 700 Nm (516 lb-ft). This makes it suitable for high-performance engines, including the 4.0L TFSI V8 and 6.3L W12 engines available in the Audi A8.
Q2 What type of transmission fluid is recommended for the AL551 transmission?
What type of transmission fluid is recommended for the AL551 transmission?
Audi recommends using genuine Audi ATF (Automatic Transmission Fluid) part number G 055 005 A2 for the AL551 transmission. The fluid capacity is approximately 9.5 liters (10 quarts) during a full service, including the torque converter.
Q3 How often should the AL551 transmission fluid be replaced?
How often should the AL551 transmission fluid be replaced?
Audi does not specify a fixed interval for transmission fluid replacement under normal driving conditions. However, for severe driving conditions (e.g., frequent towing, high temperatures, or stop-and-go traffic), it is recommended to replace the fluid every 60,000-80,000 miles (96,000-128,000 km).
Q4 What are the common symptoms of a failing AL551 transmission?
What are the common symptoms of a failing AL551 transmission?
Common symptoms include harsh or delayed shifting, transmission slipping, unusual noises (e.g., whining or grinding), and the illumination of the transmission warning light. These issues may indicate low fluid levels, worn components, or electronic control module (ECM) faults.
Q5 Can the AL551 transmission be repaired, or does it require replacement?
Can the AL551 transmission be repaired, or does it require replacement?
The AL551 transmission is repairable, and many components, such as solenoids, valve bodies, and clutches, can be replaced individually. However, severe internal damage may necessitate a complete transmission replacement. Always consult a certified Audi technician for diagnosis and repair.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Audi AL551 Transmission Service Manual
Coming SoonOfficial service manual for the AL551 transmission, including detailed repair procedures, torque specifications, and diagnostic codes.
Audi ATF Fluid Specifications
Coming SoonTechnical bulletin outlining the approved transmission fluids for the AL551 transmission and their compatibility with Audi vehicles.
AL551 Transmission Diagnostic Guide
Coming SoonStep-by-step guide for diagnosing common issues with the AL551 transmission, including fault codes and troubleshooting tips.
Audi A8 Transmission Maintenance Schedule
Coming SoonRecommended maintenance intervals for the AL551 transmission in the 2010-2017 Audi A8, including fluid changes and inspections.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.
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