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Description
APR High Pressure Fuel Pumps - 4.2L/5.2L FSI (Rebuilds)The APR High Pressure Fuel Pump (HPFP) increases 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 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) increases 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 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 is a rebuild of your factory pumps. Working pumps must be sent to APR.
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 is a rebuild of your factory pumps. Working pumps must be sent to APR.
Features:
- Dramatically increases the volume of fuel displaced by the HPFP by 41%
- Maintains higher pressures under demanding situations
- Fully rebuilt in house
- Fully machine tested and broken in before shipping
- Rebuilds your factory pumps
- Upgraded and weight matched spring
- DLC coated piston
- Heat-treated bearing-grade stainless steel material
- Supports big power
- .00004" dimensional tolerances
- .00005" geometrical tolerances
- Spring seals replaced
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 5
A thoughtful book to normalize tears
Format: Hardcover
I'm a child life specialist I have heard many parents and providers tell kids (and teens) to "stop crying" or "there's nothing to cry about" or some other variation of that hurtful phrase. I now work with children who have a parent with a serious illness and those experiencing grief. Why Do We Cry? is an amazing resource that is relevant to the majority of situations experienced by kids in my practice. It is beautifully illustrated with images that reflect the emotion in the written content. This book embraces the many reasons people cry without overstepping a boundary by trying to explain or justify the feelings. I love the subtlety of normalizing a variety of feelings and the gentle truth that sometimes we cry without knowing why. I highly recommend this book!
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Reviewed in the United States on December 10, 2022
★★★★★ 5
5 Stars!
Format: Hardcover
Mario asks his mother, “Why do we cry?” and she goes on to tell him all the different reasons that we do cry. Some of the reasons are a bit metaphorical, and might be harder for younger children to understand, but the illustrations help in those cases. (The book is aimed for 3-7 year olds, but I think the story is more fitting for ages 5 and up). The illustrations correspond well with the words on the page.
The story lets children know that it is ultimately ok to cry. I feel that the book showcasing a boy asking about crying is wonderful as some boys are told NOT to cry.
A few added pluses:
There is also a lesson that scientifically explains about tears so children can understand some of the varying reasons that tears exist. There is also a small interactive section with activities dealing with tears that will help children express their imagination.
Many thanks to Kids Can Press for granting me an e-arc to read that I chose to review. A+ on this children’s picture book!
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Reviewed in the United States on April 7, 2020
★★★★★ 4
Learn why we cry in this great kids book!
Format: Hardcover, Format: Hardcover
I received a digital copy of this book from the publisher. All thoughts and opinions are my own.
"Some days we cry because we call out for a hug but all we get back is an echo."
Why Do We Cry? begins with a boy asking his mother why we cry. There are many answers to such a question and the mother helps the boy explore the many reasons why we may shed tears.
As the mother explains the reasons why we cry, the illustrations become a bit surreal, to show the emotions and feelings associated with crying, from sadness to anger to grief. The mother compares and contrasts, all the while weaving a poetic story about her own life or memories and emotions.
This book reminds us that it is okay to cry, that crying can be a release, a way to heal, or let go. It helps us understand the difference between emotions and how they affect us.
There's an educational spread at the end of the book that teaches us the different types of tears, one of which--emotional tears-- is featured in this book, what they are made of, and even how much they weigh!
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Reviewed in the United States on June 12, 2020
★★★★★ 5
A Beautiful & Informative Exploration of Tears and Feelings
Format: Hardcover
A nonjudgemental and supportive exploration of the reasons we cry accompanied by imaginative and thoughtful art. Beautiful and informative, the final two pages include scientific information on tears to complement the emotional context of the main part of the story. Suitable for ages 3 to 7.
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Reviewed in the United States on August 25, 2020
★★★★★ 4
It's okay to cry
Format: Kindle
This picture book beautifully normalizes the reasons why children (and adults) may cry. It passes no judgment and does not belittle. Rather, some of the many reasons for tears are described; these include anger, sadness and happiness among others. Crying is seen as a normal response to being human. At the end of the book, there is additional information, some of it scientific, about tears. The book is sensitively illustrated with gorgeous pictures that enhance the text. This would be a great title to share with a child you know.
Many thanks to NetGalley and the publisher for this read in exchange for an honest review.
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Reviewed in the United States on April 8, 2020