Upgrade (M5) Fuel Injectors for 700+ HP – BMW M2 Competition, M3, M4 S55
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One component that eventually needs to be upgraded on virtually all turbocharged BMW engines as power levels increase is the fuel supply system.
The S55 engine features one of the most capable factory fuel systems BMW has ever produced. Its high-pressure fuel system is capable of supporting approximately 750 HP, thanks to the fact that the S55 is equipped with what is essentially two N55 high-pressure fuel pumps.
The interesting part is that the high-pressure fuel pumps are capable of supplying more fuel than the factory fuel injectors can deliver.
This is where the BMW M5 fuel injectors come into play as an effective upgrade.
The limitation of the factory S55 injectors is that, beyond a certain power level, they can no longer remain open long enough to supply the required amount of fuel. As a result, the target lambda value can no longer be maintained, even though the high-pressure fuel system is still capable of supplying sufficient fuel pressure.
For this reason, if you plan to run more than 700 HP on an S55 engine, upgrading to BMW M5 fuel injectors is highly recommended.
You can purchase them here.
Features
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Set of 6 brand-new upgraded fuel injectors for all BMW S55 engines
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Prevents the factory injectors from reaching their maximum injection window
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Genuine injectors from the BMW F10 M5
Important
The ECU software must be recalibrated specifically for these injectors. This adjustment is absolutely mandatory.
Without proper ECU calibration, your vehicle will not run correctly and, in the worst-case scenario, severe engine damage may occur.
Important Notice
The mention of vehicle manufacturers and model names is solely for product identification and compatibility purposes.
Unless the product description explicitly states that the item includes a parts certificate (Teilegutachten), approval certificate, or ABE (General Operating Permit), the product is supplied without road-legal approval for use under German road traffic regulations (StVZO). In such cases, individual approval under §21 StVZO is required. Please contact us for further information.