Audi RS4 RS5 B8 Alternator Mounting Bracket Support 4.2 FSI CFSA 079903805AD

Audi RS4 RS5 B8 Alternator Mounting Bracket Support 4.2 FSI CFSA is an original component from the Alternator and generator parts group, designed for precise mounting of the alternator in the 4.2 FSI CFSA engine unit. The robust construction ensures stable support for engine accessories, which translates into reliable operation of the charging system and reduction of unwanted vibrations.

Specifications and technical data

• SKU: 079903805AD
• Mark: Audi
• Condition: Used
• OEM Part Number: 079903805AD
• Substitutable numbers: 079903805AD, 079 903 805 AD
• Part type: Bearing
• Category: Alternator & Generator Parts

Purpose and function in the powertrain

The alternator mounting bracket in Audi RS4 and RS5 B8 generation models is responsible for the rigid, repeatable positioning of the alternator relative to the 4.2 FSI CFSA engine block. Proper alternator alignment is crucial for:

• maintaining the correct tension of the accessory belt,
• stable operation of the charging system at high RPMs,
• reducing mechanical loads acting on the alternator bearings.

Thanks to its factory geometry, the bracket ensures compatibility with the original accessory drive line, which is particularly important in the high-revving V8 units used in RS versions.

Benefits of using an original Audi bracket

Using an original bracket in the Audi RS4 RS5 B8 allows you to maintain the factory operating parameters of the charging system and avoid problems typical of imprecise aftermarket replacements. The most important advantages include:

• precise fit for the 4.2 FSI CFSA engine – maintaining proper alignment of pulleys and the belt,
• compatibility with the factory alternator and other accessories,
• properly selected stiffness and shape, limiting deflection under high dynamic loads,
• easier installation due to the retention of original mounting points.

By choosing this component, you maintain the structural integrity of the entire alternator drive system, which promotes long-term, repeatable engine performance in both road and track conditions.

Product characteristics and condition

The offered bracket belongs to the Alternator and generator parts group by Audi and comes from disassembly. This means it is a used component that retains its original geometry and can be reused in the process of repairing or rebuilding the engine unit. This type of component is particularly valuable when servicing high-performance engines, where compliance with factory specifications is essential.

The bracket will work well both for a standard replacement of a damaged part and for a comprehensive rebuild of the 4.2 FSI CFSA engine in an Audi RS4 or RS5 B8, where the priority is to maintain the manufacturer's original design assumptions.

Integration with other charging system components

The alternator mounting bracket works directly with the alternator, engine block mounts, and belt drive components. When properly selected and installed, it:

• facilitates maintaining the correct belt tension without overloading the tensioner,
• reduces the risk of alternator displacement during sudden load changes,
• supports even force transmission from the belt to the engine block.

This is particularly important in sports Audi models, where the engine operates across a wide RPM range and the charging system must remain stable even under intensive use.

Support in maintaining the Audi RS character

If you care about preserving the original character and dynamics of RS models, it is worth reaching for components that comply with factory specifications. You can read about the importance of original components in maintaining the brand's consistent DNA in the article Audi and emotions in their purest form – how used parts help maintain the brand's DNA, which discusses the impact of properly selected components on driving experience and vehicle durability.

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as alternator housings, mounts, or additional brackets, check out the available parts in the Audi alternator and generator parts category.