Spool Stage 3 DIY LPFP BMW F90 M5 [S63]

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Spool Stage 3 DIY LPFP | BMW F90 M5 (S63)

The Spool Performance Stage 3 DIY LPFP is an advanced low-pressure fuel pump (LPFP) upgrade kit for the BMW F90 M5 S63 engine. This solution is aimed at users who want to build a high-performance fuel system themselves (DIY) and eliminate low-pressure side limitations at extremely high power levels.

Product Description

As high-pressure pumps become increasingly powerful, the low-pressure side fuel supply often becomes a critical bottleneck, especially when using E85 and at high power outputs.

The Stage 3 DIY kit solves this by adding a secondary fuel pump to the system, which is activated according to boost pressure.

• Approximately 2x the flow compared to stock
• Supports over 1200 whp low-pressure capacity
• Works with all fuels, including E85
• Cost-effective alternative compared to ready-made plug & play solutions

Operating Principle

• Auxiliary pump activates according to boost pressure
• Provides additional flow as load increases
• Ensures sufficient supply to the HPFP system

Why is an upgrade necessary?

The S63 engine's stock LPFP is insufficient for extreme configurations:

• High power and ethanol blends require significantly more fuel
• HPFP cannot operate optimally without adequate supply

Stage 3 LPFP:

• Eliminates the low-pressure side bottleneck
• Improves system stability and reliability
• Enables extremely high power levels

Installation

• DIY solution (self-assembled)
• Clear instructions included
• Not fully plug & play

Package Contents

• 1 x Secondary fuel pump assembly
• 1 x Activation wiring harness for auxiliary pump
• 1 x Boost pressure controlled switch
• 1 x Boost pressure reference adapter
• Installation accessory kit