Spool Performance AMG SL63 [M177] Spool FX-350 Upgraded High Pressure Pump Kit

The Spool Performance FX-350 represents a new level of high-pressure fuel pump technology, designed for those pushing their Mercedes-AMG M177 engine to its limits. It builds upon the success of the FX-200, delivering significantly more flow and pressure, making it essential for high-performance and high-ethanol builds.

What is the FX-350?

The FX-350 is an advanced high-pressure fuel pump capable of delivering fuel at 35Mpa, a significant upgrade from the FX-200's 25Mpa. This 40% increase in pressure allows for improved fuel injector flow, delivering up to 90% more fuel compared to the stock system. This is crucial for performance enthusiasts looking to support bigger turbos and run higher ethanol concentrations.

• Improved Atomization: Higher fuel pressure results in finer atomization, improving combustion efficiency. The FX-350 promotes more complete fuel burns, leading to enhanced power, fuel economy, and reduced emissions.
• Superior Flow Rate: Following the principle of Q=PxA (flow rate, pressure, and injector nozzle area), the FX-350 ensures injectors flow 40% more fuel without compromising performance, making it ideal for extreme performance builds.

Why do you need it?

The stock HPFP on the M177 platform is limited when tuning for more power. The FX-350 provides 90% more flow capacity, elevating the platform's fuel delivery system to support higher power outputs, especially with bigger turbos or ethanol-based fuels.

What does the kit include?

• 2 x FX-350 High-Pressure Fuel Pumps
• 1 x Ethanol Content Monitor Kit (optional) with mobile app
• 1 x Bosch Spec 10-Micron High-Flow Fuel Filter
• Upgraded Fuel Lines and all necessary installation hardware

Additional Features:

• Spool 10-Micron Filter Unit: The best filtration available on the Mercedes market, ensuring high-pressure pumps and injectors remain protected from debris, with no noticeable pressure drop in the low-pressure fuel system.
• Spool Ethanol Content Monitor: Features a mobile app that displays in-tank ethanol content and fuel temperature. The app is BLE 4.0 compatible, allowing simultaneous connection to other Bluetooth devices. Fuel lines in the kit are black nylon-coated, braided steel PTFE core, and are 100% E85 compatible.

Are tune changes required?

Yes, the upgraded FX-350 pumps require calibration changes. These should be applied before starting the vehicle to avoid any potential damage. Spool Performance provides calibration details for your tuner or can assist in connecting you with experienced tuners. Custom tuning is crucial to maximize the pump's output.

Low-Pressure Fuel Pump Upgrade:

Proper low-pressure fueling is essential for the high-pressure pumps and injectors to function correctly and avoid damage. The FX-350 kit is best paired with an appropriate low-pressure fuel pump upgrade to ensure the system is adequately supported.

Note: 'New' merchandise may be returned for exchange or refund within 15 days from the date of shipment. 'New' merchandise must be unused and free from installation or mounting damage. Installation or modification of parts waives your right to returns, refunds, or exchanges.