BMW E81 E87 LCI 123d N47S Actuator Turbocharger Turbo Part Vacuum Box 7804638

The BMW E81 123d N47S Pear Turbo Vacuum Valve is a specialized turbocharger and parts component designed to precisely control boost pressure in the BMW engine. The OEM component used ensures factory fit and maintains proper operating parameters of the turbocharger system.

Specifications and technical data

• SKU: 7804638-7
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7804638
• Substitutable numbers: 11657804638, 7804638, KZ
• Category: Turbos & Parts

Purpose and function in the supercharging system

The turbocharger vacuum valve is responsible for controlling the position of the turbocharger's actuators, which translates into stable boost pressure and correct torque characteristics. A properly functioning vacuum valve:

• ensures smooth boost build-up throughout the entire rev range,
• reduces the risk of turbocharger overload,
• supports the correct operation of the engine controller and the protection strategies of the drive unit,
• allows you to maintain a predictable response to the accelerator pedal.

Technical characteristics and fit

This component comes from the Turbocharger and Parts group, meaning it's designed to operate in demanding environments with high temperatures and variable loads. As an OEM BMW part, it retains:

• factory mounting geometry,
• compatibility with the original turbocharger accessories,
• proper operating parameters of the membrane and vacuum actuator.

This makes installation predictable and reduces the risk of problems with the calibration of the charging system after replacement.

Used condition - practical benefits

The item is offered in used condition, which represents a reasonable compromise between cost and functionality. For many BMW E81 123d N47S owners, this solution allows for:

• reduce the cost of repairing the supercharger system compared to a new part,
• maintain the original manufacturer's specifications,
• restore correct operation of the turbocharger without interfering with the engine software.

A used OEM component is particularly attractive for cars that are used intensively, where functionality, compatibility and a reasonable service budget are key.

Application in service and diagnostics

Replacing the turbo vacuum valve is often recommended for symptoms such as:

• uneven power build-up or noticeable "holes" in the boost,
• engine emergency mode related to boost pressure,
• error messages regarding turbocharger control.

Selecting an original component from the same BMW model group reduces the need for additional modifications and facilitates the work of the workshop, especially when diagnosing the charging systems in N47S engines.

Alternative Part Numbers and Identification

The turbo vacuum valve has a dedicated OEM part number and associated interchange numbers, making it easy to identify in BMW catalogs and service systems. In practice, this means you can quickly check compatibility with a specific engine configuration and the part's revision history within a given model.

Other turbochargers and parts for BMW

If you're looking for other turbochargers and parts for BMW, check out our dedicated category: Turbochargers and Parts for BMW . This allows you to easily compare available turbocharger components and choose the right ones for your engine.

BMW Youngtimers and Used Supercharging System Components

Owners of older BMW models are increasingly turning to used turbocharger components to keep their cars in top condition without breaking the bank. If you're interested in a broader perspective on the use of used parts in cars from the 1998–2012 era, check out the article: The Second Life of a Youngtimer – How Used Car Parts Rejuvenate 1998–2012 Cars . You'll find practical upgrade scenarios and tips for selecting components there.

Summary

The BMW E81 123d N47S Pear Turbo Vacuum Valve is a used, original turbocharger and parts component designed to precisely control boost pressure in your BMW engine. Selecting this component allows you to restore proper turbocharging system operation, maintain factory engine characteristics, and optimize service costs, which is especially important for heavily used vehicles and older models that are well-maintained.