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Description
APR High Pressure Fuel Pumps - S5 4.2L V8 (Post Nov 2008)The APR High Pressure Fuel Pump (HPFP) dramatically increases the maximum volume of fuel the HPFP can deliver. 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 exacting tolerances. How the direct injection system works: A low pressure fuel pump (LPFP) in the fuel tank
The APR High Pressure Fuel Pump (HPFP) dramatically increases the maximum volume of fuel the HPFP can deliver. 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 exacting 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, a HPFP upgrade is not necessary 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 surfaces 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 possibility.
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.
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4.2 ★★★★★
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Product Reviews
★★★★★ 5
A great volume with great Tarkin/Vader relationships
Format: Paperback
I am continuing to enjoy this ongoing series showing Darth Vader shortly after Episode 3. It's cool seeing Mon Cala prior to Imperial control. I like how there's a bit of a tie-in with the ongoing Star Wars comic series. There are also flashbacks to the Clone Wars era.
I like this time period. Each jedi that evaded Order 66 is dealing with the new world in a different way. I also really enjoyed seeing a young Ackbar.
There are two standalone issues included in this volume. First, there's a story that shows the relationship between Darth Vader and Tarkin developing into what we see in the original trilogy.
The other is an Annual written by Chuck Wendig. This shows another interesting Vader/Tarkin dynamic. There are a bunch of great references that I love in this issue! Project Stardust. Geonosis. Krennic. Galen Erso. Overall, it's a really cool tie-in to Rogue One.
Yet again, I give this volume of the ongoing Darth Vader: Dark Lord of the Sith a 5/5.
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Reviewed in the United States on September 19, 2018
★★★★★ 5
A superb addition to the Marvel Darth Vader canon
Format: Paperback
An almost perfect run of comic books, focused around the Imperial assault on Mon Cala post-Episode III. Many familiar faces are here: Vader, of course; Tarkin; Ackbar; Palpatine; Rogue One’s Admiral Raddus; and many more, including Sith, Jedi, and clones (there’s a nice nod to Order 66). Charles Soule deftly weaves an intriguing narrative, fast-paced but also with plenty of depth. The art is also excellent. In addition to the main stretch of the story, the trade also contains the Darth Vader annual, an outstanding Rogue One story that caps things off nicely. Highly recommended reading for Star Wars fans.
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Reviewed in the United States on January 17, 2019
★★★★★ 4
Good for Darth vader fans.
Format: Paperback
This book was amazing. I prefribly like vol.4 more than vol.3. The writers of this book have outdone themselves again, another one of Vaders archaic stories and the book was in perfect condition. I highly recommend it.
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Reviewed in the United States on December 10, 2025
★★★★★ 5
Charles Soule's Series Continues to Impress and is Arguably the Best of Marvel's New Canon
Format: Paperback
Darth Vader leads the invasion of Mon Cala. With the Empire tightening its grip across the galaxy, Vader is dispatched by his master to the aquatic world of Mon Cala to track down a rogue Jedi who may be advising the planet's king. With the Inquisitors in tow, Vader and Grand Moff Tarkin face off with one of the first open acts of rebellion in their new Empire. Soule is at his absolute best with this series as he continues to explore a version of Vader haunted by his own inner goodness and memories of the past (the book does contain some references to events of the Clone Wars television show, but you don't need to have seen it to grasp the story). Likewise, his exploration of the seduction of the dark side is fantastic with a new Jedi target willing to use deception and war in order to light the sparks of a future rebellion. The final issue of the book may be one of the best Star Wars comics of the entire new canon with Tarkin hunting Vader for sport (on the latter's request oddly enough) across a desolate and hostile planet. The issue isn't what one expects but makes a great deal of sense when exploring the relationship between these two characters (while also explaining why Vader is so deferential to Tarkin during A New Hope). The final addition is a decent annual that sees Vader investigating the Death Star and sabotage of its construction. The annual isn't the best addition to the series (the artwork isn't up to the standards of the rest of the series), but it does introduce some intriguing ideas about Tarkin and Vader's relationship and the events that set up the Rogue One movie.
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Reviewed in the United States on September 17, 2018
★★★★★ 5
Nice
Format: Kindle
Love reading comics on the Kindle this is a great story leading up to the creation of the first death Star
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Reviewed in the United States on October 31, 2024