Mercedes M271/M274 Custom Tuning — SIM271 & MED17.7

Mercedes M271/M274 Custom Tuning

Custom calibration for supported turbocharged Mercedes-Benz four-cylinder applications, developed around the installed hardware, fuel, transmission, and intended use.

Supported applications

Common C-Class, E-Class, SLK/SLC, GLC, CLA and related M271 or M274 applications. Exact support depends on controller and software version.

Supported control units and access

Common families include Continental SIM271KE/SIM271DE and Bosch MED17.7.2 or related MED17.7 variants. HexProg II publishes support for SIM271 and MED17.7 families; StageX lists DTC and mappack coverage for these controllers. Exact ECU/TCU identification, software version, and read/write method are confirmed after purchase. Some vehicles can be flashed through OBD; others may require bench or boot access.

Choose the service level

• Calibration Level: Select the option that matches the installed hardware. Stage names describe service scope, not a guaranteed power figure.
• Drivetrain Service: Engine-only or engine plus a supported transmission calibration.
• DTC Review: Choose no DTC changes or a review of supported non-emissions diagnostic codes. This option does not include disabling required emissions or safety systems on street vehicles.

Included service

• Build, fuel, hardware, and stock-file review
• One confirmed hardware configuration and one primary fuel setup
• Scheduled remote connection or file workflow, datalog review, calibration changes, and revisions inside the purchased block
• Fuel, ignition, airflow/load, torque, boost, throttle, drivability, and supported transmission strategies as applicable

Included time: Stage 1 — up to 3 hours. Stage 2 — up to 4 hours. Upgraded Turbo — up to 5 hours. Time includes setup review, connecting, logging, calibration work, revisions, troubleshooting, and communication.

After purchase and scheduling

Our team will email the address used at checkout to confirm the vehicle, ECU/TCU, hardware, fuel, tuning goals, required files, and an available appointment time. Text or phone follow-up may be used when needed. Sessions are scheduled in Eastern Time.

Before the appointment

The vehicle must be mechanically complete, leak-free, fueled correctly, and ready to produce repeatable logs. A compatible interface, cable, software license, ECU/TCU unlock, bench service, and dyno rental are separate unless specifically stated.

Time and revision policy

This is a scheduled professional service, not an open-ended support window. Mechanical faults, communication problems, incomplete hardware, or incorrect fuel can consume the purchased time. Work beyond the included block must be purchased as Additional Calibration Time and scheduled before tuning continues. Major hardware or fuel changes may require additional time or a new calibration.

Specific power is not guaranteed. Results depend on vehicle condition, hardware, fuel quality, environment, and safe operating limits. Customers are responsible for legal and emissions compliance.