S63 High Performance Racing Engine (TU4) | BMW F9X M5/M8

The CarBahn BMW S63 engine is specifically designed for high-performance outputs, addressing the limitations of stock boost levels. Utilizing superior racing components like forged Carrillo connecting rods, CP forged pistons, high-performance valve springs, ported heads, and a reground crankshaft with stronger bearings, this rebuild is perfect for BMW performance enthusiasts. It also includes a complete valve job, timing chains, tensioners, water pump, thermostat, and new seals, bearings, and gaskets.

The stock high compression ratio, designed for CAFÉ (Corporate Average Fuel Economy), reduces engine performance at higher boost levels. CarBahn's engine lowers the compression by 0.5 to optimize boost and improve drivability on pump gas, while also reducing catalyst inlet temperatures for emissions-legal street cars.

Key features include forged rods, forged pistons, high-performance valve springs, ported heads, and a reground crankshaft with stronger bearings, along with labor and machine work for a full overhaul. As a top BMW tuning company, CarBahn ensures a reliable, high-output engine.

Engine core acceptance parameters:

• Complete factory engine (from oil pan to valve cover)
• Block must be free of cracks, holes, bore damage, and other irreparable issues
• Heads must be free of casting cracks, hole damage, and irreparable issues
• Additional repair charges apply for damaged valves, crankshafts, camshafts, guides, or mechanisms (ValveTronic/Vanos).

CarBahn offers exceptional BMW S63 engine tuning for those looking to maximize their BMW’s performance.

• Warranty & Additional Information
  Our engines are very strong and can often be very reliable even at power levels above what is recommended. The durability usually depends on the quality and the reliability of the tune and other aftermarket components added to the engine management system.

  • Engines with CarBahn Software Tunes
    All engines listed with a stage number are designed to be road car engines and are covered for 2 years, 24,000 miles providing they have a CarBahn tune and there are no other parts on the car that have caused a premature failure.
  • Engines with Another Company's Tune
    

    All engines listed with a stage number are designed to be road car engines and are covered are covered for 2 year, 24,000 miles providing they you stay under our recommended torque limits. Torque limits are indicated on our web site. Warranty does not cover failures from the tune or aftermarket fuel injection components that caused the failure. It is CarBahn full discretion to determine cause of failure. If Torque limit is exceeded the warranty is for materials and workmanship only.

  • Racing Engines
    Racing engines are designed to be raced and are covered for materials and workmanship only. Racing engines should be rebuilt periodically based on run time or mileage. Warranty does not cover failures from the tune or aftermarket fuel injection components that caused the failure. It is CarBahn full discretion to determine cause of failure.