Spool FX-170 HPFP BMW [S55]

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• You must return the ordered products within 14 days of receiving
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Pre order / made-to-order products

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If you wish to cancel your order before receiving the product, we will refund 50% of the total order amount.

This condition applies to the following product categories:

• Suspension
• Engine Tuning
• Engine Parts
• Exhaust Systems
• Fueling
• Turbochargers/superchargers
• Drivetrain
• ECE-approved Downpipes

All of the above products are manufactured or sourced individually based on the customer’s order, and therefore cannot be returned after delivery, unless the product has a manufacturing or material defect.

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Spool FX-170 HPFP Upgrade | BMW S55

The Spool Performance FX-170 is a high-pressure fuel pump (HPFP) performance upgrade for BMW S55 engines. This solution is designed to significantly increase the fuel system's capacity, enabling higher power output and ethanol blends.

What is the FX-170?

The FX-170 is an upgraded HPFP with a larger cylinder bore than the stock pump. This allows for approximately +50% greater fuel flow.

• Approx. +50% flow compared to stock
• Up to approx. +25% higher operating pressure
• Full E85 compatibility
• Plug & Play installation without modifications

Benefits of higher pressure:

• Improves injector flow with the same open time
• Enables more efficient combustion
• Supports higher power levels

Why is an upgrade necessary?

The S55 engine's stock HPFP is a limiting factor in tuning:

• Insufficient fuel delivery for high power
• Limited use of ethanol blends

FX-170:

• Significantly increases fuel system capacity
• Enables larger turbochargers
• Expands the platform's tuning potential

Package contents

• 2 x FX-170 high-pressure fuel pumps
• Upgraded fuel lines + installation hardware
• Bosch 10 micron high flow fuel filter
• Ethanol content monitoring system with mobile app

Spool 10-micron filter

• Excellent filtration efficiency without significant pressure drop
• Protects pumps and injectors from contaminants
• Designed for the S55 platform

Spool Ethanol Content Monitor

• Real-time monitoring of ethanol content and fuel temperature
• BLE 4.0 connection to mobile application
• Enables precise mixture ratio control
• Full E85 compatibility for fuel lines

Software requirements

• Requires software modifications before use
• Calibration must be performed before using the pump

Spool:

• Provides necessary information to the tuner
• Helps in finding an experienced tuner if needed

Note: Spool does not offer ready-made custom tunes

Important note: LPFP

The low-pressure fuel system is critical:

• Insufficient supply can damage pumps and injectors
• HPFP lubrication relies on fuel flow
• Lack of fuel can lead to wear and failure

Recommendation: ensure sufficient low-pressure side upgrade