N55 Wiki
6-Cylinder Single Turbo (2009-2019)
The BMW N55 is a turbocharged inline-6 engine that replaced the N54 and was produced from 2009 to 2019. It features a single twin-scroll turbocharger and is known for its reliability and tuning potential. Found in a wide range of BMW models including the 135i, 335i, 535i, and X5.
N55 Variants
Note: Production date determines wastegate type for 2013 models. M Performance variants (M135i, M235i) make 322 HP, while the F87 M2 produces 365-370 HP.
Models with N55 Engine
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 BorgWarner B03 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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