S55 Wiki

6-Cylinder Twin Turbo M Engine (2014-2021)

The BMW S55 is the high-performance M variant of the N55, featuring twin mono-scroll turbochargers and forged internals. Found in the F80 M3, F82/F83 M4, and F87 M2 Competition, the S55 delivers 405-493 HP depending on variant, with the M4 GTS featuring water injection for maximum output.

Displacement

2,979cc

Configuration

I6 Twin Turbo

Stock Power

425 HP

Compression

10.2:1

S55 Key Features

Twin Turbochargers

2x Mitsubishi TF035 mono-scroll turbos with electronic wastegates

Forged Internals

Forged connecting rods for high-RPM durability

Reinforced Block

Strengthened crankcase for increased power handling

Higher Flow Fuel System

Larger injectors than N55 for increased fuel delivery

Models with S55 Engine

F80 M3

M3 Sedan (2014-2018)

F82 M4

M4 Coupe (2014-2020)

F83 M4

M4 Convertible (2014-2020)

F87 M2 Competition

M2 Competition (2018-2021)

F87 M2 CS

M2 CS (2020)

F80 M3 CS

M3 CS (2018)

F82 M4 CS

M4 CS (2017-2019)

F82 M4 GTS

M4 GTS (2016)

Articles

Engine Specifications

Detailed technical specs including bore, stroke, compression ratios, valve timing, and component materials.

Common Modifications

Recommended upgrades including intakes, intercoolers, charge pipes, downpipes, and fuel system upgrades.

Turbo Information

OEM Mitsubishi TF035 twin turbo specifications including compressor and turbine wheel sizes.

Servicing & Maintenance

Service intervals, fluid specifications, recommended oils, and maintenance best practices.

HPFP & LPFP Flow Data

High and low pressure fuel pump flow rate data and max HP ratings for fueling upgrades.

Injector Flow Data

Injector specifications, flow rates, and max HP ratings for various upgrade options.

Spark Plugs Guide

Spark plug specifications, heat ranges, and recommendations for various power levels.

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