N63B44A Engine — 4.4L V8 Engine for BMW

N63B44A Engine for BMW 5 Series, 6 Series, 7 Series, X5, and X6 (4.4L V8)

The BMW S63B44 is a 4.4-liter twin-turbocharged V8 engine produced by BMW M. This engine is renowned for its unique “Hot-V” turbocharger layout and cross-bank exhaust manifold design, delivering a maximum output ranging from 555 to 635 horsepower, depending on the specific model variant.

Description

Core Specifications
Engine Type: 90° V8, Twin-Turbo (Bi-Turbo)
Displacement: 4.4 L (4,395 cc)
Bore × Stroke: 89 mm × 88.3 mm (3.50 in × 3.48 in)
Valve Train: Dual Overhead Camshafts (DOHC), 32 Valves, featuring Valvetronic and Double-VANOS
Intake System: Twin-Scroll Turbochargers (positioned within a “Hot-V” layout)
Redline: 7,200 rpm

Power Output Variants
The S63 engine has undergone multiple Technical Updates (TU): Bimmerpost
S63B4400 (Original Version): Featured in the E70 X5 M and E71 X6 M models.
Power: 555 hp (408 kW) 6,000 rpm
Torque: 501 lb-ft (680 Nm) 1,500–5,650 rpm
S63B44TU (TU): Featured in the F10 M5 and F12/F13/F06 M6 models.
Power: 560 hp (412 kW) 6,000–7,000 rpm
Torque: 502 lb-ft (680 Nm) 1,500–5,750 rpm
S63B44T2: Featured in the F85 X5 M and F86 X6 M models.
Power: 567 hp (423 kW) 6,000–6,500 rpm
Torque: 553 lb-ft (750 Nm) 2,200–5,000 rpm

S63B44T4: Featured in the F90 M5, F91/F92/F93 M8, F95 X5 M, and F96 X6 M models.
Base Output: 600 hp (441 kW) 6,000 rpm.
Competition Edition
Output: 617–635 hp (460–473 kW) 6,000 rpm.
Torque: 553 lb-ft (750 Nm) 1,800–5,600 rpm.