The Spool performance Helix HPFP Overdrive Unit has been developed for BMW N54 and early N55 engines to significantly increase the capacity of the original high-pressure fuel pump (HPFP). By increasing the HPFP’s rotational speed, the volume of fuel delivered is increased, thereby preventing pressure drop at higher power outputs. This provides an effective solution for high-power builds without the complexity of additional port injection systems.
Benefits
• Increases HPFP capacity through higher pump speed•
Prevents rail pressure drop at high power outputs•
No additional port injection required•
Suitable for E85, E60 and petrol
setups• Developed and tested for high-performance applications•
Covered by the Spool performance Lifetime Warranty
Technical specifications
• Type: HPFP overdrive unit•
Application: OEM HPFP (N54 / early N55)
• Function: Increased displacement via
overdrive• Fuel: Petrol, E60,
E85• Requirements: Stage 3 low-pressure fuel pump
Power 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 fitting hardware
Delivery time
• Other options: 5–10 working days•
N54 engine + No filter unit: 1 working day*
Frequently Asked Questions
Why is an overdrive unit necessary?
At higher power outputs, the OEM HPFP cannot supply fuel quickly enough, leading to a loss of pressure. The Helix increases the pump speed and resolves this issue.
Is additional fuel tuning required?
Yes. A Stage 3 low-pressure fuel pump is required
What is the difference between the Helix and the Helix Xtreme?
• Helix: suitable for up to 600 whp on
E85• Helix Xtreme: higher capacity, supporting 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.
