Spool Performance Helix HPFP Overdrive Unit

Take your N54 or early N55 build to the next level with the Spool Performance Helix HPFP Overdrive Unit—a revolutionary upgrade designed to maximize the fueling capability of your factory high-pressure fuel pump (HPFP) without adding port injection or auxiliary systems.

After nearly a year of rigorous in-house testing, the Helix is ready to help you achieve reliable fueling up to 850+whp, especially when running ethanol-based fuels.

What Is the Helix?

The Helix is a precision planetary gearbox that attaches to your HPFP and increases its shaft speed. Using an axial gear design—similar to those found in automotive transmissions—it effectively increases pump stroke frequency, dramatically enhancing fuel delivery without replacing or modifying the pump itself.

This allows your stock HPFP to keep up with high-performance fuel demands, even on full E85.

Why Choose the Helix?

• Boosts HPFP Output: Increases delivery strokes per cycle by spinning the pump faster.
• Supports High-Power Builds: Handles ethanol mixes up to full E85 with ease.
• No Port Injection Required: Solves low-pressure fueling issues without additional fuel systems.
• Retains OEM Pump Reliability: Extensive testing confirms no added wear or failure risks.
• Easy Bolt-On Installation: All necessary hardware included for a clean install.

Performance Options:

Helix (Standard Version)

• Supports up to 600whp on full E85
• Supports 750+whp on E60 or pump gas blends

Helix Xtreme (Coming Soon)

• Supports up to 750whp on full E85
• Supports 850+whp on E60 or gasoline blends
• Final phase of longevity testing in progress

Proven Durability:

Despite concerns over HPFP wear, long-term testing of the Helix unit revealed:

• No significant wear on core pump components
• Negligible metal content in oil samples
• No additional stress on known failure points like the inlet metering valve or bypass seals

This means you get big gains in fueling without compromising pump reliability.

Tune Adjustments Required

To fully utilize the Helix’s increased output, tune modifications are necessary. Spool Performance works with all major tuners and will provide support and adjustments upon request.

What’s Included:

• Billet Vacuum Cover Mounting Plate
• Support Bracket
• Full Installation Hardware
• Access to calibration support

Compatible Vehicles:

• BMW 135i (E82/E88)
• BMW 335i / 335is (E90/E92/E93)
• BMW 535i (E60)
• BMW 740i (F01)
• Any N54 or early N55 platform using a mechanical HPFP

Why Spool Performance Helix?

Because you don’t need to add complex fuel systems just to run E85 or big turbos. The Helix is a clean, OEM-like solution that upgrades your HPFP’s capability with race-proven performance, engineered durability, and plug-and-play simplicity.

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.

The standard shipping rate applies to orders within the continental United States. If you intend to place an order outside of the continental US, please reach out to support@x-ph.com for assistance.