Cooper S Convertible
B48 / B46 (US)

The calibration principles are the same — it is the same B48 engine — but every file is written for the individual car, its gearbox, fuel and fitted parts rather than copied across from a hatch map. What changes most is emphasis: Convertible owners usually want smooth, muscular mid-range delivery, and Samuel shapes the torque curve accordingly.

It moves the Convertible from 189–192 bhp and 280 Nm to 245–260 bhp and 360–400 Nm without a single hardware change. The extra 80–120 Nm through the middle of the rev range is what you notice roof-down — overtakes shrink and the car stops needing to be revved out to feel quick.

An upgraded intercooler, a sports cat or decat, and an intake, ideally with one-step-colder plugs. Together they support 270–285 bhp and 420–460 Nm on the standard turbo. A pleasant side effect with the roof down: the freer-breathing exhaust gives the Cooper S a noticeably better voice.

Yes. The remap lives in the engine ECU, so both transmissions are covered, and Samuel calibrates torque delivery to suit whichever your car has — automatics get delivery shaped to protect the gearbox at full load, manuals get a linear curve that is easy to meter out of tight corners.

Once your build details are in, the custom file reaches your flashing platform — BM3, MHD or MG Flasher — within 24 hours, and flashing it yourself takes around 15 minutes over the OBD port. There is no booking, no transporter and no time off the road, which suits a car bought for spontaneous good-weather drives.