BMW Accesstuner

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Product Code: AT-BMW

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Accesstuner Support

This part is not an emissions-related part and therefore can be used on Emission Controlled Vehicles.


Online training with EFI University is required prior to receiving your unique, licensed copy of Accesstuner. The cost associated with this training is $149 and the transaction will occur with EFI University. Click "Get Accesstuner" for more details.

Accesstuner is engine tuning software created for enthusiast tuners. Accesstuner allows the user to get into the heart of the OEM ECU and create custom calibrations for vehicles equipped with virtually any performance modification. The end result is a tune that is custom tailored to the vehicle's unique modifications, producing maximum power gains while maintaining the drive-ability and sophistication inherent in the OEM ECU.

COBB Tuning does not provide calibration support for Accesstuner users. For information regarding tuning strategies and tips, reference the Tuning Guides mentioned below.

System Requirements: Windows: XP 32 (not 64bit), Vista, Windows 7, Windows 8.1, Windows 10.

Accesstuner is only compatible with V3 Accessports.


Accesstuner Software for BMW

BMW Accesstuner
  • Simple Interface with Tuning Flexibility
  • Same tuning capabilities as our Accesstuner Pro shop grade software
  • Access to a huge number of tables for full tuning control
  • COBB Tuning provided tuning documentation
  • Compatible with V3 Accessports Only


Accesstuner Support Page


Simple Interface: Significant amount of time has been spent creating a simple, straight-forward interface that takes the mystery out of BMW's complex load-based tuning system. Intuitive changes provide anticipated results and let you get down to the task of tuning.

Tuning Flexibility: Access to over 70 tables in the ECU (DME) allow tuning for a wide range of modifications.

Vanos Control (N54 Only): Full control of VANOS system via tables for intake and exhaust with separate tables for cold vs. warm operating contitions in idle, moving and spool states, allowing tuner to adjust valve timing to improve drivability and boost control.

Individual Cyl. Timing Correction: Accesstuner logs timing correction on all cylinders, providing a complete view of possible and a better understanding of how the engine is running.

Fuel Control: Full control of fuel system including Fuel Pressure Targeting, Commanded Fuel tables and catalytic converter protection.

Fuel Scalar: Quickly update Accessport maps to accommodate fuels of different specific energy using the Fuel Scalar tables, resulting in proper fuel trims during engine operation for fuels such as E85 and other custom blends.

Limiter Tables (N54 Only)Adjust rev limits by gear, speed limiter, requested torque limit, and many more.

Throttle Tables: Customize engine response to throttle pedal input quickly and easily, with 3-D graphing.


Tuner Auto Updater: Users can access tuning software updates through the "Help/Updates" menu.

Integral Data Logging: Unlimited data logging of multiple channels of data from the ECU for detailed analysis of engine performance.

Integral Dashboard: Shows tuner chosen gauges to be displayed on-screen throughout the tuning process

Unit Conversion: Ability to easily convert between metric and standard units so the tuner can use units he/she is most familiar with

Map Database: Free access to the Off –The-Shelf (OTS) map database from COBB Tuning that provide excellent starting points for specific modifications.

Hot Keys: Convenient one-touch short-cut keys allow easy data manipulation of common tuning operations.

Wideband O2 Interface: Open wideband O2 interface integrates with a wide selection of available wideband O2 sensors.

Embedded Stock Data: Stock tuning data (ROMs) are self-contained inside the software itself, providing the OEM baseline tune for each vehicle supported by the software.

Tuning Documentation: Step-by-step Accesstuner Help File provided by COBB Tuning Calibrators explains ECU logic and procedures for properly tuning your specific application. For release notes, update instructions, monitor & table list, tutorials, help documentation, CLICK HERE.

Customer Photos