This comprehensive 72-page PDF file contains the official VAG Self-Study Program 198 (SSP 198), dedicated entirely to the design, function, and engineering theory of the iconic Audi 2.7-litre V6 Biturbo engine. Revered by tuners and enthusiasts for its massive power potential (famously used in the B5 S4 and C5 A6), this complex powerplant requires a deep understanding of its interrelated systems. While this is not a step-by-step workshop manual, the technical knowledge it provides is absolutely indispensable for complex diagnostics, engine builds, and understanding how modifications affect the factory systems.
This highly detailed technical guide covers the following critical areas:
- Engine Architecture and Internal Mechanics: A deep dive into the physical construction of the V6. It details the specific design of the cylinder heads, crankshaft, and the complex camshaft timing mechanisms required to optimize airflow for the twin turbos. It also fully explains the engine’s dedicated cooling and high-stress lubrication circuits.
- Biturbo System and Airflow Management: The core of the 2.7T’s performance. It thoroughly maps out the complete air ducting path, the specific design of the turbochargers, and the crucial exhaust system layout.
- Charge Pressure and Pneumatic Controls: Essential reading for diagnosing boost leaks or tuning. It breaks down the theory and function of the complex charge pressure control system, the operation of the diverter valves (air divert control in overrun), and the various pneumatically controlled subsystems.
- Motronic ME 7.1 Engine Management: A comprehensive overview of the “brain” controlling the engine. It explains torque-oriented engine management, the electronic throttle system (drive-by-wire), and the critical exhaust gas temperature control strategies designed to protect the turbos. It also details the function of the various engine sensors and auxiliary signals.
- Drivetrain and Diagnostics: The manual concludes with information on the self-adjusting clutch and gearbox used in conjunction with the 2.7T, as well as an overview of the factory self-diagnosis capabilities.
Whether you are trying to understand how the ME 7.1 ECU calculates torque, mapping out the complicated vacuum line routing, or preparing for a major engine service, SSP 198 is the definitive technical resource for the 2.7L V6 Biturbo.
CONTENTS
- Introduction
- Engine description and special features
- Technical data
- Engine mechanics
- Cylinder block
- Crankshaft
- Cylinder head
- Camshaft drive configuration
- Crankcase ventilation system
- Positive Crankcase Ventilation (PCV)
- Fuel tank ventilation
- Vacuum system
- Oil supply
- Oil circuit overview
- Oil pump
- Piston cooling
- Sensors and actuators
- Oil filter and oil-coolant heat exchanger
- Oil filter module
- Oil supply in the cylinder head cover
- Drive for ancillaries
- Cooling system
- System overview
- Coolant circuit in cylinder block
- Cooling concept for the cylinder head
- Transmission coolant circuit
- Air supply
- Overview of air ducts
- Intake manifolds
- Throttle Valve Control Modules GX3 and GX4
- Turbocharging
- Twin scroll exhaust manifold
- Twin scroll turbochargers
- Turbocharger mounting
- Turbocharger oil and coolant connections
- Heat shield in inner V of engine
- Exhaust system
- Fuel system
- High-pressure injector
- Engine management
- System overview
- Engine Control Module
- Inspection and maintenance
- Service information and operations
- Special tools and workshop equipment
Language: English
Format: PDF
Pages: 88
Self Study Program 920493 – The Audi 4.0l V8 TFSI engine from the EA825 series
