APR® (09-22) Audi R8/Lambo Huracan/Gallardo Valve Spring/Seat/Retainer Kit

Compatible: (5.2L)

2009 - 2022 Audi R8

2011 - 2014 Lamborghini Gallardo LP 550-2

2012 - 2014 Lamborghini Gallardo LP550-2 Spyder

2014 Lamborghini Gallardo LP560-2

2009 - 2014 Lamborghini Gallardo LP560-4

2010 - 2014 Lamborghini Gallardo LP560-4 Spyder

2011 - 2014 Lamborghini Gallardo LP570-4 Performante Spyder

2011 - 2014 Lamborghini Gallardo LP570-4 SuperLeggera

2018 Lamborghini Huracan Coupe

2020 - 2022 Lamborghini Huracan EVO

2020 - 2022 Lamborghini Huracan EVO Spyder

2017 - 2019 Lamborghini Huracan LP580-2

2019 Lamborghini Huracan LP580-2

2018 Lamborghini Huracan LP580-2 Spyder

2015 - 2019 Lamborghini Huracan LP610-4

2019 Lamborghini Huracan LP610-4 S

2018 Lamborghini Huracan LP610-4 Spyder

2018 - 2020 Lamborghini Huracan Performante 

2018 - 2020 Lamborghini Huracan Performante Spyder

2018 Lamborghini Huracan RDW Spyder

2018 Lamborghini Huracan Spyder

2021 - 2022  Lamborghini Huracan STO

THIS PRODUCT CAN BE SHIPPED TO CALIFORNIA 

The APR Valve Spring System is a high performance, lightweight upgrade designed to increase valve control and eradicate valve float common on many applications. APR's design specifications called for a valve spring, retainer and spring seat combination that doesn't overpower and snap the OEM valves or erode the aluminum spring seat, while still maintaining exceptional valve control. The result is an advanced design that's 28% lighter yet 20% stiffer than the high performance OEM Golf R setup and is proven to eliminate the OEM valve train's weakest link. We call it Performance Without Compromise!

Valve Springs:
Weight reduction, and not necessary stiffness, is absolutely necessary to increasing valve control. The APR Valve Spring utilizes a beehive design that allows for a reduction in mass in not only the spring itself, but also through use of a smaller titanium retainer. The springs feature an ovate wire design that allows for even stress distribution resulting in better control at high RPMs through a resistance of harmful valve float inducing harmonics. The lightweight design also accomplishes accurate valve control without requiring an overly stiff spring which has been proven to snap OEM valves in half. Each valve spring weights 29 grams and represents a 19% weight reduction over the OEM Golf R spring. The result is a highly engineered design that's simply plug and play!

Valve Spring Retainers:
Through the use of a beehive design, APR's Engineers were able to design and supply a valve spring retainer that's smaller than stock to reduce weight as much as possible. In an effort to offer extreme weight savings, at an additional 71% over the OEM Golf R retainers, American 6AL4V titanium was used for its high specific strength weighing in at only 2 grams each. By offering outstanding weight savings, exceptional valve control characteristic are achieved while only requiring a modest 20% increase in stiffness over the OEM Golf R spring.

Valve Spring Seats:
Often an overlooked piece of an upgraded valve train is the valve spring seat. The factory heads are aluminum, and unfortunately increased spring pressure can distort or erode the mating surface overtime as they mate directly to the bare head. To prevent this from happening, APR's Engineers designed valve spring seats out of 4140 heat-treated chrome molly steel with a black oxide coating. The spring seats are strong enough to withstand pressure from the springs and provide a mating surface that evenly distributes spring load across a larger area than the spring it self, allowing an increased spring rate without negative side effects to the aluminum head.

Eliminating Valve Float:
It's not uncommon to experience valve float with the OEM valve springs, even below the OEM rev limit. On some applications like the 2.0 TSI, back pressure from the K04 turbocharger has been known to force the exhaust valves open. This has been noticed on vehicles with overly weak OEM valve springs and some with higher miles that have simply lost their stiffness over time. This issue accompanies misfires commonly above 5000 RPM. In some extreme cases, valves are forced open and the vehicle ceases accelerating any further. A quick datalog of intake mass airflow and boost pressure at wide open throttle will show a sudden rise in boost pressure with an immediate loss of airflow as pressure from the open valves is pushed back into the intake manifold. On other applications, valve float can begin to occur just beyond the OEM rev limit. While other components, such as higher strength valves are often required for extremely high revving applications, the APR Valve Spring System will eliminate float well beyond the revving constraints set forth by the other components. 

• Increase valve train control
• 71% weight reduction over OEM Golf R retainers
• 19% weight reduction over OEM Golf R springs
• 20% stiffness increase over OEM Golf R springs
• Eradicates TSI K04 "valve float" issues
• Supports higher revving application
• Weight saving beehive spring design
• ASTM A877A OTSC round wire steel springs
• 6AL4V American titanium retainers
• 4140 heat-treated chrome molly steel spring seats with black oxide coating
• 29 grams per spring
• 2 grams per retainer
• Compatible with OEM valves
• Spring seats included to protects against aluminum erosion in the head

Founded in 1997, APR is the global leader in performance aftermarket products for Volkswagen, Audi, Seat, Skoda, Porsche, and other vehicles. APR develops and manufactures hardware, software, calibration & data-logging tools for engine and transmission controllers, including intakes, exhaust systems, intercoolers, turbocharger systems, suspension, brake systems, wheels, and more. APR delivers software via a 24-hour automated global delivery system from its 80,000 square foot state of the art facility in Opelika, Alabama.

Warranty: