Spool FX-170 HPFP Kit | AMG M157
The Spool Performance FX-170 is a high-pressure fuel pump (HPFP) performance upgrade for AMG M157 engines. This solution is designed for high-power V8 biturbo builds where the standard fuel system quickly becomes a limitation.
What is the FX-170?
The FX-170 is an upgraded high-pressure pump with a larger piston diameter than stock. This allows for approximately +50% greater fuel flow.
- +50% flow compared to stock
- Full E85 compatibility
-
Plug & Play installation: no cutting or wiring modifications
- Improves injector capacity and overall system flow
Additional capacity allows for:
- Higher ethanol blends
- Larger turbochargers
- Higher power levels
Why is an upgrade necessary?
The M157 engine's standard HPFP is a limiting factor in tuning:
- Insufficient fuel delivery for high power
- Limited use of ethanol blends
The FX-170:
- Significantly increases fuel system capacity
- Enables higher power safely
- Supports demanding tuning configurations
Package Contents
- 2 x FX-170 high-pressure fuel pump
- Upgraded fuel lines + mounting hardware
- Bosch 10-micron high-flow fuel filter
- Ethanol content monitoring system (optional)
Spool 10-micron filter
- Excellent filtration performance without significant pressure drop
- Protects HPFP and injectors from contaminants
- Designed for high-power configurations
Spool Ethanol Content Monitor (optional)
- Real-time ethanol content and fuel temperature display
- Mobile app (BLE 4.0 connectivity)
- 0–5V output for flex fuel systems
- Full E85 compatibility for fuel lines
Software Requirements
The FX-170 requires software modifications:
- Calibration must be performed before use
- Operation without calibration may cause damage and void warranty
Spool:
- Provides necessary information to the tuner
- Helps find an experienced tuner
Note: Spool does not provide ready-made custom tunes
Important Note: LPFP
The low-pressure fuel system is critical:
- Insufficient LPFP can damage HPFP and injectors
- HPFP lubrication relies on fuel flow
- Lack of fuel → wear and failure
Recommendation: ensure adequate low-pressure side upgrade