Spool FX-170 HPFP Upgrade | BMW N20
The Spool Performance FX-170 is a High-Pressure Fuel Pump (HPFP) performance upgrade for BMW N20 engines. This pump is designed to eliminate the capacity limitations of the stock system, allowing for significantly higher fuel flow in tuned setups.
What is the FX-170?
The FX-170 is an upgraded HPFP with a larger piston diameter than the standard pump. This produces approximately +50% more flow compared to the original pump.
- +50% Flow Capacity
- Full E85 Compatibility
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Plug & Play Installation: no cutting or wiring modification
-
+25% Higher Operating Pressure → better injector performance
Additional capacity allows for:
- Higher ethanol blends
- Larger turbochargers
- Higher power levels
Why is an upgrade necessary?
The N20 engine's stock HPFP is a clear bottleneck in tuning:
- Insufficient fuel delivery for higher power outputs
- Ethanol blends are limited by the stock system
The FX-170:
- Significantly increases fuel system capacity
- Improves injector flow with higher pressure
- Enables more powerful and safer tuning
Package Contents
- 1 x FX-170 High-Pressure Fuel Pump
- Upgraded Fuel Lines
- All necessary installation hardware
Optional Accessories
- Ethanol Content Analyzer (with mobile app)
- Bosch 10 Micron High Flow Fuel Filter
Ethanol Analysis
The actual ethanol content of E85 fuel can vary significantly (approximately E51–E85).
- Incorrect mixture relative to tuning can cause engine damage
- The measurement system helps to precisely optimize the mixture
Spool 10-micron filter
- Top-tier filtration on the market without significant pressure drop
- Protects HPFP and injectors from contaminants
- Recommended add-on for high-power configurations
Software Requirements
The FX-170 requires software modifications before commissioning:
- Calibration must be performed before starting the engine
- Operation without adjustment can cause damage and void the warranty
Spool:
- Provides necessary information to your tuner
- Can refer to experienced tuners
Note: Spool does not offer ready-made custom tunes
Important Note: LPFP
The low-pressure fuel system is critical:
- Insufficient LPFP can cause damage to the HPFP and injectors
- HPFP lubrication relies on fuel flow
- Lack of fuel → wear and failure
Recommendation: ensure sufficient low-pressure side upgrade before commissioning