Volvo tuned the 2.5-litre T5 five-cylinder in the 2009 C30 for smooth everyday drivability, leaving sizeable margins in its Bosch ME9.0C control logic. This Stage 1 calibration closes those gaps by reshaping driver-torque and throttle tables for more immediate response, raising turbo request curves inside the OEM knock and temperature safety envelope, and refining fuel and ignition maps to maintain a clean, consistent lambda trace under fast transients. Cam-phasing limits stay stock to protect valvetrain longevity, while catalyst protection, misfire detection, oxygen-sensor and CAN plausibility diagnostics remain fully active. Cold-start and altitude strategies are untouched, so start-up manners and emissions compliance are preserved; the T5 simply delivers a keener surge through the mid-range and a flatter pull to the redline without upsetting the engine’s built-in safeguards.