PTEB Builds
BMW M4 Competition S55: +74 kW on Stock Turbos
· 1 min read · PTEB Tuning
The F82 M4 Competition's S55 twin-turbo six is famously strong from the factory. This Stage 1 build — software only, on the stock turbos — shows how much more it has to give.
The result
- 334.3 kW at the wheels @ 6,240 rpm
- 596.9 Nm @ 3,896 rpm
- +74 kW and +96 Nm over baseline
The build
- Stock turbochargers
- Custom PTEB calibration
- Verified with OBD logging
What makes the S55 so tunable
BMW calibrates the S55 with significant headroom. A custom map raises boost and torque where the engine and turbos are comfortable, and the DCT gearbox can be calibrated to match.