APR Direct Injection Fuel Pump Audi

Description

The engine’s fueling system operates to a maximum of 1973 PSI (136 bar) of pressure to correctly spray and atomize fuel directly into the engine’s cylinders. This is contrast to multi port injection vehicles of the past which typically operated around 40-60 PSI and were driven off of a low pressure fuel pump. To generate these enormous pressures, the 4.2L FSI V8s variable low pressure fuel pump supplies fuel to two cam driven and solenoid fired high pressure fuel pumps which in turn supplies the injectors with fuel. A dual-lobe cam located on each intake camshaft drive the 4.2L FSI V8s high pressure fuel pumps. As engine speed increases, so does each pump’s ability to displace a greater volume of fuel per minute. The maximum volume each pump can deliver per revolution on the dual-lobe cam is dictated by the stroke length from each cam lobe’s lift and bore diameter of each pump’s internal pressurizing cylinder. It’s important to understand, despite the name, high pressure fuel pump upgrades are not necessarily designed to increase the engine’s fuel rail pressure. The primary goal is to increase the volume of available fuel. The engine’s fueling system is very capable without modification, even at high power levels generated using previously available stage III TVS1320 supercharger system. However, stage III+ TVS1740 supercharger system is capable of generating significantly more power and requires modification to high pressure fuel pumps to keep up with fueling demands. Each high pressure fuel pump addresses fueling needs and leaves plenty of headroom for safety and further increased power levels in the future. By increasing each pump’s internal capacity, the fueling system is capable of displacing a higher volume of fuel per minute at every RPM. The key to reliability comes in part by use of extremely high grade materials and manufacturing techniques. The most critical components within each HPFP are the enlarged plungers and barrels.
Direct Injection Fuel Pump; High Pressure; 1973 PSI Fueling System; 6 lbs.; w/Stainless Steel/ Heat Treated Piston And Bore; 303 Stainless Steel Fastener;
Features
WARNING CA Proposition 65: Yes
WARNING CA Proposition 65 Message: WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov
Holley Performance Emission Code 7: This part is legal under the provisions of EPA s memorandum 1A. The company has reasonable basis (test results) to verify that this product allows the vehicle to operate within legal emissions standards and is therefore legal to be sold for on-street use in all states that accept the legal provisions of the Clean Air Act and EPA Memorandum 1A. This product is NOT LEGAL FOR SALE OR USE IN THE STATE OF CALIFORNIA. Testing with the California Air Resources Board; in order to achieve 50-state compliance; is pending with CARB. Once testing is complete with California; and an E.O. number is issued; this product will be updated to 50-state legal status
Notes:
High Pressure; 1973 PSI Fueling System; 6 lbs.; w/Stainless Steel/ Heat Treated Piston And Bore; 303 Stainless Steel Fastener