APR Tuning High Pressure Fuel Pump | 2007-2008 Audi RS4 (MS100072)

2007-2008 Audi RS4 High-Pressure Fuel Pump by APR Tuning

The APR High-Pressure Fuel Pump (HPFP) increases the maximum volume of fuel the HPFP can deliver by 41% over stock! In doing so, the direct injection fueling system is capable of satisfying fueling requirements set forth by high horsepower setups. This is accomplished by increasing the displacement of the pump using high-quality components to exact tolerances.

How the direct injection system works: A low-pressure fuel pump (LPFP) in the fuel tank delivers fuel to the high-pressure fuel pump (HPFP) at roughly 4 to 6 bar. Fuel pressure is then bumped up to a maximum of 136 bar, depending on factory parts, with the HPFP. Finally, high-pressure fuel is delivered to the injectors, which spray directly into the cylinders.

The problem: The volume of fuel the HPFP pump can displace is directly tied to the displacement of the pump (Internal bore size, and camshaft dictated stroke), and engine speed. The pump is driven off of a camshaft. Upgraded supercharger and turbocharger systems are capable of taxing this system, especially in the mid to lower RPM range where fuel volume is lower.

The APR solution: We dramatically increase the volume of fuel the HPFP can displace at every RPM by increasing the displacement of the HPFP. This is accomplished by increasing the bore diameter of the pump's internal pressurizing cylinder. It's important to understand, despite the name, an HPFP upgrade is not necessarily designed to increase the engine's fuel rail pressure. The primary goal is to increase the volume of fuel available, which will keep fuel pressure steady even in the most demanding of situations!

High-quality components and extreme tolerances: The HPFP internals must be machined to extreme tolerances and installed in a clean environment or the pump can easily fail. Dimensional tolerances on the APR HPFP are as tight as .00004" and geometric tolerances are as tight as .00005". The plunger and barrel are created from certified and heat-treated bearing-grade stainless steel and the plunger undergoes a special diamond-like coating process for exceptional surface hardness and ultra-reliable operation. To prevent float associated with altering the plunger's mass, APR supplies each unit with a properly specified spring. All internal seals are replaced, including the spring seal, and the tip of the pump retains the factory pivoting head to reduce cam follower wear and piston side loading.

Internal testing: All APR HPFPs are assembled in-house under strict assembly guidelines. Each pump is then tested on our test rig to ensure the pumps operate as designed. This step is important for several reasons. It's critical in determining if a pump has a failure from incorrect install, a leaking seal, or a bad solenoid. Secondly, a seized pump on the vehicle at startup can cause damage to the engine's camshaft. By testing each pump, we all but eliminate these possibilities.

Proven track record: APR pioneered HPFP upgrades in the early days of VAG direct injection engines. Soon after, APR became an OEM supplier of HPFP and GDI components to VAG for use in various race cars, racing series, project cars, and concept vehicles. The APR HPFP has been at the center of countless motorsport victories across the globe and has operated with a nearly perfect tract record since the program's motorsport-backed inception in 2006. With tens of thousands of pumps sold, APR has a wealth of knowledge, and manufacturing expertise necessary to deliver a product that will and has stood the test of time.

This kit included two new rebuilt pumps.

Features

• Fully rebuilt in house
• Fully machine tested and broken in before shipping
• New factory pumps included
• Upgraded and weight-matched spring
• DLC coated piston
• Heat-treated bearing-grade stainless steel material
• Spring seals replaced

Benefits

• Dramatically increases the volume of fuel displaced by the HPFP by 41%
• Maintains higher pressures under demanding situations
• Supports big power

Applications

• 2007-2008 Audi RS4

What's In The Box?

• 2 - High-pressure fuel pumps

Warranty

• All APR Tuning items are warranted to be free from defects in the materials and workmanship prior to installation. Warranty is only applicable to the original owner. This warranty does not cover labor, misuse, faulty installation, failure of related parts or parts purchased other than from APR, LLC. Please call for specific warranty information on each product. For any questions regarding your APR warranty email support@goapr.com.