The EU5 high-flow injectors for the BMW N55, S55, and S63 engines, originally designed for the BMW M5's S63 engine, offer significant enhancements in fuel delivery capabilities. These Bosch OEM injectors are known for their ability to support higher horsepower setups, making them a popular upgrade for those looking to maximize their engine's performance, particularly in high-powered builds.
These injectors can achieve flow rates suitable for around 1000 wheel horsepower (whp) with gasoline and approximately 800 whp when running on E85 fuel blends. The EU5 injectors are compatible with the N55 and S55 engines when paired with suitable high-pressure fuel pump (HPFP) systems, like those from Dorch Engineering. This makes them a versatile choice for enthusiasts aiming to increase power outputs without the need for supplemental fueling systems.
One key consideration for installing these injectors is that they require proper tuning adjustments. The process involves coding through BMW's ISTA software, which ensures the injectors are calibrated correctly to work seamlessly with the vehicle’s existing fuel system. This aspect makes them a preferred choice for experienced tuners familiar with their application in S55-based builds like the BMW M3 and M4, as well as various N55 models.
The kit typically includes six injectors and decoupling elements, designed for a direct fitment with minimal modifications. Given their high flow rates and reliability, the EU5 injectors are often considered an ideal upgrade for those looking to enhance the performance of their N55, S55, or S63-powered BMWs, particularly when aiming for substantial power gains.