BMW 1 Series M135i 306hp Remap

The BMW 1 serie M135i 306hp is a 2.0L naturally aspirated petrol engine producing 306 BHP and 450 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 335 BHP and 500 Nm — a gain of around 29 BHP (9%) and 50 Nm (11%).

This engine has limited remap suitability, with a balanced spread of gains across both power and torque — providing a noticeable improvement across the rev range. The tuning headroom is classified as moderate, based on the percentage gain available from the factory output.

From a technical perspective, the transmission is many variants use zf 8-speed automatic (where fitted); manuals also exist. at this torque level, transmission and driveline servicing history becomes especially important..

Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.. High tuned torque: check transmission torque capacity and service history.

All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.