QST BMW M140/M240i B58 ECU Software

Our QST ECU Software for the B58 Powerplant has been expertly developed on the dyno and tested vigorously on the road to provide a fully developed tuning solution offering exceptional gains in HP and Torque throughout the powerband and drivability exceeding expectations whilst still maintaining complete reliability as you would expect.

Stage 1:

-420- 430HP

-590NM

Stage 2:

-450HP

-610NM

For Stage 2 a de-cat or sports cat downpipe at the minimum.

 Other features are available in our bespoke software, 'GTS' burbles, crackle on over-run and cold start delete.

Stage 2+:

-475-500HP

-640+NM

For Stage 2+, you require stage 2 hardware with the addition of a B58 TU HPFP, and TU spark plug upgrade.