BMW engine tuning

ByteTuner is a complete tuning suite for OBD2 BMW engine tuning.  Suitable for professional tuning shops and enthusiasts alike, ByteTuner provides all necessary functions to extract the full potential out of your stock vehicle or custom engine build.

  • Flashing through OBD2
  • Full map editing
  • Data logging
  • Checksum corrections
  • RSA signatures
  • Diagnostics
  • Flash counter reset
  • EWS/DME sync*
  • Adaptations

* except MS45

Supported DMEs

ByteTuner is compatible with the following BMW DMEs:

  • MS41.1
  • MS41.2
  • MS42
  • MS43
  • MS45.0
  • MS45.1
  • MSS52
  • MSS54
  • MSS54HP

We mods

ByteTuner supports nearly any engine modifications:

  • Forced induction (turbo/supercharger)
  • Larger injectors
  • Headers
  • Exhaust
  • Cold air intake
  • Engine swaps

Modified base tunes

Unlimited vehicles

Included with the purchase of ByteTuner is a free license for one vehicle.  Unlimited licenses can be purchased for additional vehicles.  This makes it economical for enthusiasts with a single vehicle or professional tuning shops with hundreds of vehicles.

Note: Although ByteTuner is locked to a single computer, additional software licenses can be purchased at a discount for other computers.

Data logging

ByteTuner can record dozens of live engine channels such as engine speed, temperature, air flow, fuel, ignition advance, vehicle speed, VANOS position and much more! All data is displayed to a scrolling graph in real-time. Afterwards, the data can be saved to a file for later use.


Record analog signals

In addition to the many OBD2 channels that can be recorded, up to 4 differential analog signals of your choice can also be logged in parallel! Monitoring your wideband air/fuel ratio, boost gauge or practically any factory or aftermarket sensor is now a reality.

We proudly support DATAQ Instruments DI-1100 analog data acquisition module which can be purchased separately on their website.  We’ve thoroughly tested this unit and it meets our needs for signal quality, cost and robustness.

USB OBDII cables

ByteTuner is compatible with most USB OBD2 cables which support K-Line communication and BMW diagnostic protocols. It has been specifically developed to support the infamous K+DCAN interface which is popular among BMW enthusiasts today. If in doubt, we offer compatible cables with our software.

System requirements

Note: Installations on virtual machines are strongly discouraged at this time.  This sometimes causes problems with the software licensing manager.  Also, some MS45.1 customers experience issues when reading/flashing their DME due to communication corruption.  We’ve thoroughly tested on native Windows installations and intend our software to be used only in native environments.


  • Microsoft® Windows® Vista/7/8/10
  • 1GHz CPU
  • 512MB RAM
  • 100MB disk space
  • USB 1.0


  • Microsoft® Windows® Vista/7/8/10
  • 2GHz CPU
  • 1GB RAM
  • 200MB disk space
  • USB 2.0 or newer