Spool FX-400X HPFP BMW [B58 Gen.2]

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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-400X HPFP Upgrade | BMW B58 Gen.2

The Spool Performance FX-400X is the manufacturer's flagship High-Pressure Fuel Pump (HPFP) for BMW B58 Gen2 engines. This model represents the pinnacle of the series, offering an operating pressure of up to 350 bar and approximately +20% more capacity than the already high-performance FX-350.

Attention

The product is currently on backorder. It is advisable to confirm availability before ordering.

What is the FX-400X?

The FX-400X is an HPFP designed for extreme performance projects, elevating the B58 Gen2 platform's fuel capacity to a new level.

• Operating pressure up to 350 bar / 35 MPa / 5000 psi
• Approx. +20% more flow vs. FX-350
• Full E85 compatibility
• Plug & Play installation
• Designed for maximum DI-only performance

When combined with Spool IFX350 Gen2 injectors:

• Enables very high power without additional injection
• Removes key limitations of the Gen2 B58 fuel system

Performance

HPFP + IFX350X Gen2 Injectors:

• Gasoline: approx. 1100 whp
• E50: approx. 900 whp
• E85: approx. 800 whp

HPFP + IFX150 Gen2 Injectors + cam lift mod:

• Gasoline: approx. 1200 whp
• E50: approx. 1050 whp
• E85: approx. 900 whp

Intended Use

The FX-400X is designed for extreme DI-only setups:

• Maximum performance without a port injection system
• Optimized to work with Spool's Gen2 injectors and cam lift upgrade
• Enables very high power levels

Installation

• Completely Plug & Play
• Includes all necessary components for a clean and easy installation

Package Contents

• Spool FX-400X High-Pressure Fuel Pump
• Mounting bracket
• Pump alignment tool
• Triple-layer low-pressure hose (nylon / stainless steel braid / PTFE)
• Plug & Play HPFP adapter harness

Software Requirements

• Requires software changes before commissioning
• Support for various flash platforms is under development
• Spool can assist with implementing the necessary calibration changes

Important note: LPFP

The low-pressure fuel system is critical:

• Insufficient supply can cause cavitation and damage
• Such damage is not covered by warranty
• An upgraded LPFP is virtually essential for setups of this level

Warranty

• Lifetime warranty against manufacturing and material defects