Spool Stage 3 DIY LPFP BMW [S58]

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Spool Stage 3 DIY LPFP | BMW S58

The Spool Performance Stage 3 DIY LPFP is a low-pressure fuel pump (LPFP) upgrade kit for BMW S58 engines. This solution is aimed at enthusiasts who want to build a cost-effective yet high-performance fuel system themselves.

The Stage 3 DIY kit offers almost the same flow capacity as ready-made plug & play solutions, but at a significantly more affordable price. The kit allows for the addition of a secondary fuel pump, activated by boost pressure, to the system.

• Matches the flow capacity of a plug & play solution
• Significantly more affordable DIY option
• Removes the low-pressure side bottleneck
• Designed for high-power S58 configurations

Operating Principle

• Secondary pump activates based on boost pressure
• Increases fuel delivery as load increases
• Ensures sufficient supply to the high-pressure system (HPFP)

Why is an upgrade necessary?

The S58 engine's standard LPFP can become a limitation, especially in tuned configurations:

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

Stage 3 LPFP:

• Significantly increases fuel system capacity
• Improves system reliability
• Allows for high power levels safely

Installation

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

Package Contents

• DW300 fuel pump (modified with quick disconnect)
• Billet aluminum pump bracket
• Corrugated nylon hoses (pump and filter side)
• Clamps (crimp + screw clamps)
• Activation wiring harness
• Boost pressure-controlled switch
• Boost pressure reference adapter
• Installation hardware kit

Compatibility

BMW models equipped with the S58 engine, including:

• F97 X3 M
• F98 X4 M
• G80 M3 / M3 Competition / M3 Competition xDrive
• G82 / G83 M4 / M4 Competition / M4 Competition xDrive