BMW 1 Series 135i - N55 - twinscroll 306hp Remap

The BMW 1 serie 135i - N55 - twinscroll 306hp is a 3.0L turbocharged petrol engine producing 306 BHP and 400 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 365 BHP and 520 Nm — a gain of around 59 BHP (19%) and 120 Nm (30%).

This engine has moderate remap suitability, with gains weighted towards torque — you will notice the difference most strongly in mid-range pulling power and in-gear acceleration. The tuning headroom is classified as high, based on the percentage gain available from the factory output.

From a technical perspective, the transmission is many variants use zf 5/6-speed automatics (where fitted); manuals also exist. at this torque level, transmission and driveline servicing history becomes especially important..

Considerations: Turbo petrol: fuel quality and cooling can influence repeatable performance.. High tuned torque: check transmission torque capacity and service history.. Large torque increase: drivetrain condition (clutch/gearbox) becomes more important at this level.

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.