Spool Performance FX-170 Upgraded High Pressure Fuel Pump Kit [S55]

The Spool Performance FX-170 Upgraded High-Pressure Fuel Pump Kit for the BMW S55 engine is the ideal upgrade for enthusiasts aiming to maximize fueling capacity in high-power builds. With a larger bore than the stock unit, the FX-170 delivers 50% more fuel flow, ensuring your fueling system can keep up with big turbo setups, high-boost applications, and aggressive ethanol blends. It operates at 25% higher pressure than stock, which allows injectors to deliver a greater volume of fuel within the same opening time—critical for supporting increased horsepower and E85 tunes.

This kit is fully E85 compatible and features a plug-and-play design, meaning no cutting or splicing is required for installation. It is engineered for reliable, long-term use in high-performance environments, offering significant improvements over the factory HPFP.

Why You Need It:

The stock S55 HPFP is a common bottleneck when pushing the engine beyond its factory limitations. The Spool Performance FX-170 resolves this issue by increasing fueling headroom and providing improved stability under higher pressures. This is crucial for those running larger turbos, aggressive ethanol mixtures, and high-boost setups, as it ensures the fueling system can maintain optimal performance even under extreme conditions.

Key Benefits of the FX-170 Upgrade:

• 50% more fuel flow compared to the stock HPFP, enabling support for larger turbos and higher ethanol blends.
• 25% higher operating pressure than the stock pump, which increases injector output for greater fuel volume and power potential.
• Designed for high-boost, high-horsepower builds, ensuring fueling needs are met for demanding applications.

What’s Included in the Kit?

• 2x FX-170 Upgraded High-Pressure Fuel Pumps
• 1x Optional Ethanol Content Monitor Kit with mobile app support
• 1x Bosch-Spec 10-Micron High-Flow Fuel Filter
• Upgraded Fuel Lines & Complete Installation Hardware
• Spool 10-Micron Fuel Filter

Ethanol Content Monitor:

For those running ethanol blends, the Spool Ethanol Content Analyzer (ECA) Kit provides real-time monitoring of in-tank ethanol content and fuel temperature. The ECA syncs with the Spool Performance mobile app via Bluetooth Low Energy (BLE 4.0) for seamless connectivity. The kit includes braided steel nylon-core fuel lines that are 100% E85 compatible and rated for durability.

Tuning Requirements:

Custom tuning is essential when installing the FX-170 HPFP. Calibration changes are required before starting the vehicle, and Spool Performance provides tuning information to your tuner to help optimize the fuel system for your specific setup. Note: Spool Performance does not provide custom tuning services, but is available to assist with tuning-related inquiries.

Low-Pressure Fuel Pump (LPFP) Upgrade:

A properly upgraded low-pressure fuel system is critical to the longevity and efficiency of the HPFP and injectors in direct injection (DI) systems. Insufficient LPFP supply can result in premature wear and damage to the HPFP due to poor fuel lubrication. Ensure your fuel system is adequately upgraded to support your performance goals and prevent damage from low-pressure starvation.

Fitment
The Spool Performance FX-170 Upgraded High-Pressure Fuel Pump Kit is compatible with the following BMW models equipped with the S55 engine:

• BMW F80 M3
• BMW F82 M4
• BMW M2 Competition

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.