Audi S4 Right 2.7T Turbo Charger B5 00-02 OEM

Description

Audi S4 Right 2.7T Turbocharger for the B5 platform (model years 2000-2002) is a fundamental component of the factory twin-turbocharged 2.7-liter V6 engine system. This turbo is a precision-engineered Borg Warner K03 unit, designed to deliver reliable performance, optimal boost, and emissions compliance while maintaining longevity under OEM standards. Below is a detailed, extensive description of this right-side turbocharger covering its specifications, design, role, performance, maintenance, and replacement considerations.

OEM right turbocharger for the Audi B5 S4 2.7T, produced for the 2000-2002 model years, is a crucial component of the twin-turbocharged engine system. It is typically a Borg Warner K03 turbo, designed to deliver reliable boost and performance for the stock engine configuration.

OEM Right Turbocharger for B5 S4 (2000-2002)

• Part Number: Usually identified as 078145704S or similar, this turbo is mounted on the passenger side (right side) of the engine.

• Design: A compact, ball-bearing turbocharger that features a twin-scroll turbine housing for improved spool times and efficiency. It optimally supports factory boost levels (~8-9 psi) and maintains longevity under OEM specifications.

• Construction: Built with high-quality materials for durability, including a cast aluminum compressor wheel and a turbine wheel designed to withstand high exhaust temperatures.

• Compatibility: The OEM right turbo fits directly onto the factory exhaust manifold and intercooler piping without modification. It utilizes factory oil and coolant lines, making it a straightforward replacement or rebuild part.

Performance and Usage

• The OEM turbo supports the stock performance of the B5 S4, producing around 250-280 horsepower with the proper ECU tuning.

• It provides quick spool response and a broad power band suited for daily driving and stock to mildly tuned setups.

• For high-performance builds, many enthusiasts replace this OEM turbo with upgraded units such as hybrid K04s, RS6 turbos, or custom-tuned larger turbos to improve top-end power and boost capacity.

Replacement and Upgrading Options

• OEM Replacement: Genuine Borg Warner K03 turbochargers can be purchased from authorized parts suppliers or used markets, maintaining OEM specifications and reliability.

• Aftermarket Upgrades: For increased power, many opt for hybrid or larger turbos like the RS4 hybrid turbos, TTE780+, or custom K04-based setups. These provide increased airflow and support higher boost levels (note: require ECU remaps).

• Remanufactured Units: Many turbo rebuilders offer remanufactured OEM turbos, often with upgraded bearings or coatings to extend durability.

Installation and Maintenance

• Replacement involves removing the existing turbo, inspecting the oil and coolant lines, and installing the new unit with OEM gaskets and mounting hardware.

• Ensuring proper break-in, oil changes with high-quality synthetic oil, and regular boost system inspections help prolong turbo lifespan.

• For high-power applications, reinforce the cooling system and intercoolers to reduce thermal stress on the turbo.

Summary

The OEM right turbocharger (06M-145-689-AC or similar) for the B5 S4 is a key component designed for durability, efficiency, and proper fitment within the factory twin-turbo system. While excellent for maintaining stock performance, this turbo can be upgraded with hybrid options or larger units for high-performance tuners aiming to exceed 400+ horsepower. Its reliability, ease of replacement, and compatibility make it a popular choice for restoration, repair, and mild upgrades in the B5 S4 community.