Description
Build to Order – This is a rebuild of your factory pump.
Fits: 2017-2024 Audi A6, A7, A8, Q7, Q8, RS5, S4, S5, S6, S7, SQ5, Bentley Bentayga, Flying Spur, Porsche Cayenne, Macan, Panamera.
Overview
The APR High Pressure Fuel Pump (HPFP) increases fuel delivery volume by 37% over stock, allowing the direct injection system to meet the demands of high-horsepower builds. This enhancement is achieved by increasing the pump's displacement with premium components and precision engineering. Notably, on the B9 2.9T, this upgrade resulted in an additional 37 AWHP and 50 AWFTLBS with the Stage 1+ (E85) ECU Upgrade.
How the Direct Injection System Works
- Low Pressure Fuel Pump (LPFP): Pumps fuel from the tank to the HPFP at approximately 4 to 6 bar.
- High Pressure Fuel Pump (HPFP): Elevates pressure to a maximum of 200 bar, delivering high-pressure fuel directly to the injectors.
The Problem
The volume of fuel displaced by the HPFP is constrained by:
- Internal bore size
- Camshaft stroke
- Engine speed
Larger turbocharger systems and ethanol usage can strain this system, particularly in lower RPM ranges.
The APR Solution
APR significantly increases the fuel displacement by enlarging the internal bore of the HPFP. This upgrade focuses on enhancing fuel volume rather than merely raising fuel rail pressure, ensuring consistent fuel availability during demanding conditions.
Key Features
- 37% Increased Fuel Volume: Supports high-performance demands.
- High-Quality Components: Utilizes genuine Hitachi parts for exceptional reliability.
- Precision Engineering: Tolerances as tight as .00004" (dimensional) and .00005" (geometric).
- DLC Coated Piston: Ensures superior hardness and reliable operation.
- Rebuilt In-House: Each unit is meticulously assembled and tested in-house for optimal performance.
Technical Specifications
- Material: Heat-treated bearing-grade stainless steel.
- Rebuilt Components: All seals replaced; includes upgraded, weight-matched spring and titanium retainer.
Proven Track Record
APR has been a leader in HPFP upgrades since 2006, providing components for race applications and achieving numerous motorsport victories. With tens of thousands of pumps sold, APR delivers products backed by extensive knowledge and expertise.
Emissions Compliance
This product complies with the EPA’s Tampering Policy and is legal for use in all states except California. Testing for 50-state compliance is ongoing, and updates will be provided upon completion.
Tech Resources
This upgrade requires sending your existing pump to APR for rebuilding. Ensure the pump and solenoids are in working order, and package the unit carefully to prevent damage during transit. For optimal performance, the ECU must be updated with compatible software, such as the B9 RS5 Stage 1+.
