BMW S63 4.4 Twin Turbo V8: Specs, Versions, ECUs & Maintenance
BMW · Engine information · U.S. & Canada
S63
4.4 twin turbo · Cross-bank exhaust, M response
The S63’s cross-bank exhaust arrangement feeds its twin-scroll turbochargers with carefully separated exhaust pulses. Its revisions span several generations of M cars, bringing different injection systems, controllers and power levels.
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Engine versions
- Original
- S63B44O0 · 9.3:1 compression
- First TU
- S63B44T0 · 10.0:1
- X5 M / X6 M update
- S63B44T2 · 10.0:1
- Later version
- S63B44T4 · 10.0:1
- Construction
- Aluminium block and heads
- Valve control
- Double VANOS; Valvetronic on TU versions
Airflow & fuel
- Turbochargers
- Two twin-scroll · inside the V
- Exhaust
- Cross-bank pulse arrangement
- Charge cooling
- Air-to-water
- Injection
- Direct · piezo original, solenoid on TU
- Rail pressure
- Up to 200 bar; T4 up to 350 bar
- Control architecture
- Dual bank DMEs on TU versions
Engine controllers · MSD85.1, MEVD17.2.8/H and MG1CS201
The controller changes are tied to engine hardware, not simply advertised horsepower. TU engines use a controller for each bank; DME 1 coordinates shared information and passes it to DME 2. Both units and their cooling system belong in a complete diagnosis.
| Controller | Applications & timing | Technical distinction |
|---|---|---|
| Continental/Siemens MSD85.1 | O0 · E70 X5 M / E71 X6 M, 2010–2014 model runs | Original piezo-injection control and boost management; distinct from later Valvetronic systems. |
| Bosch MEVD17.2.8 | T0 · F10 M5 and F06/F12/F13 M6 | TC1797; dual bank controllers with Valvetronic and solenoid-injector control. |
| Bosch MEVD17.2.H | T2 · F85 X5 M / F86 X6 M, 2015–2018 | TC1797; revised TU controller identified in BMW F85/F86 training. |
| Bosch MG1CS201 · DME 8.8.T | T4 · F90 M5, F9x M8 and F95/F96 M models | TC298; dual controllers, 350-bar fuel system and model-specific thermal/torque protection. |
Read both DMEs and confirm the full engine code and software level. Base, Competition and special-edition calibrations can share a controller family without sharing output limits.
Selected U.S. & Canadian vehicles
| Model | Chassis | Model years | Engine / factory output |
|---|---|---|---|
| X5 M / X6 M | E70 / E71 | 2010–2013 / 2010–2014 | O0 · 555 hp / 500 lb-ft |
| M5 / M6 | F10 · F06/F12/F13 | 2013–2016 / 2012–2019 by body | T0 family · 560 hp / 500 lb-ft base |
| X5 M / X6 M | F85 / F86 | 2015–2018 | T2 · 567 hp / 553 lb-ft |
| M5 | F90 | 2018–2023 | T4 · 600 hp; Competition 617 hp · 553 lb-ft |
| M8 | F91 / F92 / F93 | 2020–2024 | T4 · 600 hp; Competition 617 hp · 553 lb-ft |
| X5 M / X6 M | F95 / F96 | 2020–2023 | T4 · 600 hp; Competition 617 hp · 553 lb-ft |
Selected North American factory specifications. Competition packages and limited editions require their own build-specific ratings.
Common issues & key risks
Expansion-tank leaks. Documented on F90/F9x applications: the tank material can deteriorate, causing coolant loss. Inspect promptly and follow BMW’s precautions to keep coolant out of the injector area.
Oil consumption. Valve-stem-seal faults are documented on earlier E70/E71 M applications. Smoke and oil use also require checks of ventilation and turbo sealing; later S63 revisions need their own diagnosis.
Injectors & misfires. Faulty injectors can produce rough running, poor starts or fuel dilution. Check plugs, coils, fuel pressure and cylinder-specific data before replacing injectors.
Turbo lubrication. Restricted feed or return lines can damage a turbocharger. New turbo noise or lost boost needs an oil-supply and charge-system inspection.
Heat-aged hoses & seals. Check turbo coolant connections, breather hoses and cover seals for leaks. Address falling fluid levels before sustained high-load use.
Keep it consistent: Use approved fluids and the prescribed running-in service where applicable. Track use and repeated high-temperature operation call for a maintenance plan suited to that load.
References
| Topic | Source |
|---|---|
| Version comparison | BMW F85/F86 technical training |
| T4 engineering | BMW S63TU4 technical training |
| Oil-use diagnosis | BMW SIB 11 03 13 |
| Expansion-tank failure | BMW SI B17 02 22 |
| Early S63 valve seals | BMW SI B11 08 15 |
| Injector diagnosis | BMW SI B13 07 12 |
| Turbo lubrication | BMW SI B11 07 11 |
| Photograph | BMW S63 engine in an M5 at Techno-Classica 2018. Photo: Matti Blume / Wikimedia Commons · CC BY-SA 4.0. Resized. |
Model years refer to selected U.S. and Canadian applications. Equipment and software vary by build. Use current BMW service information for diagnosis and repair.
