Spool Performance FX-170 Upgraded High Pressure Fuel Pump [N55]

The Spool Performance FX-170 Upgraded High-Pressure Fuel Pump is designed for BMW N55-powered 35i single-turbo models such as the 335i and 435i. The FX-170 features a larger bore size than the stock pump, providing approximately 50% more fuel flow, making it the perfect upgrade for high-performance applications. It is fully E85-compatible and 100% plug-and-play, meaning no cutting, splicing, or modifications are required during installation. This upgraded fuel pump enables you to run higher ethanol concentrations and provides the necessary fueling to support larger turbos and other performance modifications.

Whether you're aiming for more power or planning to run advanced fuels, the FX-170 ensures your fuel system can meet the demands of aggressive tuning. This critical upgrade unlocks your engine's full potential, allowing for increased performance and reliability during high-boost and high-power applications.

Why You Need It:

The stock HPFP on the BMW N55 engine has limited capacity, which can become a bottleneck when tuning for higher horsepower and running ethanol blends. The FX-170 overcomes this limitation by providing:

• 50% more fuel flow, allowing for larger turbos and higher ethanol concentrations.
• Increased injector output, enabling your fuel system to meet the needs of aggressive tuning.
• Higher fueling limits to push the platform further, supporting advanced fuel mixes and boosting overall engine performance.

The FX-170 is essential for anyone looking to enhance their N55-powered BMW with big turbo setups, higher ethanol blends, or custom tuning.

What’s Included in the Kit?

• 2x FX-170 Upgraded High-Pressure Fuel Pumps
• Upgraded Fuel Lines and Complete Installation Hardware

Optional Add-Ons:

• 1x Ethanol Content Monitor Kit with mobile app support
• 1x Bosch-Spec 10-Micron High-Flow Fuel Filter

Spool 10-Micron Fuel Filter:

Included in the kit is a Bosch-Spec 10-Micron High-Flow Fuel Filter. This filter ensures optimal fuel flow with zero pressure drop on the low-pressure side of the fuel system. It effectively protects your high-pressure pumps and injectors from harmful debris, improving long-term performance and system reliability.

Ethanol Analyzer:

Ethanol content can vary significantly between E85 fuel pumps, with ethanol blends sometimes containing as little as E55 (55% ethanol). This uncertainty can lead to engine damage if not monitored properly. The Spool Ethanol Content Analyzer provides real-time ethanol content readings, helping you avoid damaging your engine by ensuring you’re running the correct ethanol mix for your tune.

Ethanol Sensor App:

The Ethanol Sensor App is a free mobile app that helps you monitor ethanol content and estimate fuel blends. The app includes an Ethanol Mix Calculator to ensure you get the perfect fuel blend every time. Even without the analyzer kit, the app can be used to estimate ethanol content, making it a valuable tool for tuning.

Are Tune Changes Required?

Yes, the FX-170 requires calibration changes before starting your vehicle with the upgraded pump installed. These changes must be made to avoid potential engine damage and to prevent voiding your warranty. Spool Performance provides calibration details for your tuner and can assist in connecting you with experienced tuners who specialize in these pumps. Custom tuning is necessary to maximize the performance of your fuel system and fully optimize your setup based on your modifications and environmental conditions.

Low-Pressure Fuel Pump Upgrade:

Upgrading your low-pressure fuel pump (LPFP) is essential to ensure the longevity and reliability of your high-pressure pump and injectors. Insufficient low-pressure fueling can lead to premature HPFP wear or failure, as the pump relies on fuel for lubrication. Damage caused by low-pressure fuel starvation is detectable and will void warranty coverage. Be sure to upgrade your low-pressure system as needed to match the demands of high-power builds and ensure optimal performance.

Fitment:

The Spool Performance FX-170 Upgraded High-Pressure Fuel Pump kit is compatible with the following BMW models powered by the N55 engine:

• BMW 335i
• BMW 435i

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.