Name the exact engine and specification
Start with registration, engine, factory output, gearbox and current modifications. A model badge can cover several engine and controller versions. State whether the ECU or TCU has already been programmed and provide the history where known.
Explain the driving goal: response, a stronger mid-range, a hardware-matched setup or another practical priority. Naturally aspirated and turbocharged applications have different prospects; a generic turbo gain should not be applied to every petrol car.
Use the fuel you can maintain
Tell us which fuel grade you will normally buy. A calibration brief should not assume a premium grade that the vehicle will rarely receive. Fuel specification belongs with the proposed output and intended use, rather than being a detail added after programming.
If the car has been running differently after a fuel or software change, describe it before booking performance work. Warnings, misfire or unexpected noise need investigation. Follow the agreed fuel requirements after calibration.
Review cooling and drivetrain condition
List intake, intercooler, turbo, fuel-system and exhaust changes, including exact part specifications. The installation and operating condition matter as much as owning the parts. Include diagnostic findings or previous logs where available.
For DSG, ZF and other supported automatic applications, engine and gearbox strategies can be discussed together. A manual car needs an honest clutch-condition history. Higher output should not be used to ignore an existing transmission symptom.
Confirm access and verification
Controller support varies by generation, hardware and software. The team identifies the actual access route before agreeing mobile, workshop or removed-unit work. Tuning coverage for one version does not prove coverage for a later update.
Ask which checks are included in the quote and how the proposed result will be reviewed. Measured output requires the agreed measurement method. A calculator comparison or another car’s result is not a test report for your vehicle.