Stage 1 S63 High Performance Engine (TU4) | BMW F9X M5/M8

Stage 1 S63 TU4 High Performance Engine: F90 M5, F91, F92, F93 M8 The CarBahn ST1 S63 engine is rated for up to 850 lb-ft of torque. It is designed to improve durability for medium-output tunes, making it an excellent alternative to an OEM factory remanufactured engine, especially if your original engine has failed and is no longer under warranty. We utilize high-quality racing components, including Carrillo connecting rods, forged CP pistons, high-performance valve springs, and a high-performance head gasket. This engine maintains the stock compression ratio, ensuring excellent drivability and fuel economy. The CarBahn S63 engine is both stronger and more affordable than the BMW OEM factory engine, making it the ideal choice for BMW S63 performance enthusiasts. Steve Dinan's engine shop, with 46 years of experience, has built engines that have won numerous championships, including three prototype racing championships and two overall wins in the 24 Hours of Daytona (2011-2013). You won’t find a higher-quality engine from any other BMW tuning company. All engines come with a two-year warranty. Experience the power and performance of S63 engine tuning with CarBahn. Steve Dinan has been building high performance and racing engines for BMW since 1977, winning 11 racing championships including 3 prototype championships and two 24 Hours of Daytona. The same engine shop that builds the racing engines also builds the street car engines. These talented engineers, machinists, and builders have built hundreds of engines from OEM street rebuilds to full-blown racing engines. From stock, the S63 engine is not designed for a large increase in boost. CarBahn has designed a high-performance engine to handle very high outputs by utilizing higher quality racing Carrillo connecting rods and forged CP pistons. The stock engine compression ratio is relatively high due to the Corporate Average Fuel Economy (CAFE) standards which push for consistently higher fuel economy in cars and trucks. However, this increased compression limits engine performance with higher boost settings by decreasing the size of the fuel-air charge in the combustion chamber, forcing the ignition timing to retard far below MBT (Mean Best Timing, the theoretical optimal ignition timing). Therefore, the Carbahn S63 engine has 0.5 less compression to optimize the engine for the increased boost. In an emissions-legal street car, the lowered compression has the added benefit of reducing catalyst inlet temperatures and improved drive-ability on pump gas. Engine core acceptance parameters Must be complete core (factory engine, from oil pan to valve cover) Block must have no: Holes or cracks in casting Holes or crack in covers Bore damage that cannot be honed out Thrust surface damage Journal surfaces damage Bolt hole damage that can’t be repaired Heads must have no: Holes or cracks in casting Holes or crack in covers Thrust surface damage Journal surfaces damage Bolt hole damage that can’t be repaired Additional repair charges could apply for damaged items that are not normally changed during an overhaul and cannot be repaired or serviced Valves Crankshafts Camshafts Guides ValveTronic mechanism Vanos mechanism https://www.youtube.com/watch?v=WSHusoVQm8o   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.  .