The Spool Performance Helix HPFP Overdrive Unit was developed for BMW N54 and early N55 engines to significantly increase the capacity of the original high-pressure fuel pump (HPFP). By spinning the HPFP faster, the volume of fuel displaced is increased, preventing pressure drops at higher power outputs. This provides an effective solution for high-power builds without the complexity of additional port injection systems.
Advantages
• Increases HPFP capacity through higher pump speed
• Prevents rail pressure drop at high powers
• No additional port injection required
• Suitable for E85, E60 and petrol setups
• Developed and tested for high-performance applications
• Backed by Spool Performance Lifetime Warranty
Technical specifications
• Type: HPFP overdrive unit
• Application: OEM HPFP (N54 / early N55)
• Function: Increased displacement through overdrive
• Fuel: Petrol, E60, E85
• Requirements: Stage 3 low-pressure fuel pump
Asset support
Helix
• Up to 600 whp on full E85
• 750+ whp on E60 blends
Helix Xtreme
• Up to 750 whp on full E85
• Up to 850+ whp on E60 blends or petrol
Compatibility
• BMW 135i E8x – N54 / N55
• BMW 335i E9x – N54 / N55
Contents
• Billet vacuum cover mounting plate
• Support bracket
• All necessary mounting hardware
Delivery time
• Other options: 5 - 10 working days
• Engine N54 + No filter unit: 1 working day*
Frequently Asked Questions
Why is an overdrive unit needed?
At higher power outputs, the OEM HPFP can't deliver fuel quickly enough, leading to pressure loss. The Helix increases pump speed and solves this problem.
Is additional fuel adjustment necessary?
Yes. Stage 3 low-pressure fuel pump is required
What is the difference between Helix and Helix Xtreme?
• Helix: suitable up to 600 whp on E85
• Helix Xtreme: higher support up to 750+ whp on E85
Has this product been tested for durability?
Yes, the Helix has been fully tested. The Helix Xtreme is in the final stages of durability testing.
