{"product_id":"apr®-12-13-audi-tt-rs-quattro-valve-spring-seat-retainer-kit","title":"APR® (12-13) Audi TT RS Quattro Valve Spring\/Seat\/Retainer Kit","description":"\u003cp\u003e\u003cstrong\u003eCompatible: (2.5L)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e2012 - 2013 Audi TT RS Quattro\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"color: #097428;\"\u003e\u003cstrong\u003eTHIS PRODUCT CAN BE SHIPPED TO CALIFORNIA \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eThe 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! \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003cstrong\u003eValve Springs: \u003c\/strong\u003e\u003cbr\u003eWeight 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!\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003e\u003cstrong\u003eValve Spring Retainers: \u003c\/strong\u003e\u003cbr\u003eThrough 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003e\u003cstrong\u003eValve Spring Seats: \u003c\/strong\u003e\u003cbr\u003eOften 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003cstrong\u003eEliminating Valve Float: \u003c\/strong\u003e\u003cbr\u003eIt'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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul class=\"productpage_list\"\u003e\n\u003cli\u003eIncrease valve train control\u003c\/li\u003e\n\u003cli\u003e71% weight reduction over OEM Golf R retainers\u003c\/li\u003e\n\u003cli\u003e19% weight reduction over OEM Golf R springs\u003c\/li\u003e\n\u003cli\u003e20% stiffness increase over OEM Golf R springs\u003c\/li\u003e\n\u003cli\u003eEradicates TSI K04 \"valve float\" issues\u003c\/li\u003e\n\u003cli\u003eSupports higher revving application\u003c\/li\u003e\n\u003cli\u003eWeight saving beehive spring design\u003c\/li\u003e\n\u003cli\u003eASTM A877A OTSC round wire steel springs\u003c\/li\u003e\n\u003cli\u003e6AL4V American titanium retainers\u003c\/li\u003e\n\u003cli\u003e4140 heat-treated chrome molly steel spring seats with black oxide coating\u003c\/li\u003e\n\u003cli\u003e29 grams per spring\u003c\/li\u003e\n\u003cli\u003e2 grams per retainer\u003c\/li\u003e\n\u003cli\u003eCompatible with OEM valves\u003c\/li\u003e\n\u003cli\u003eSpring seats included to protects against aluminum erosion in the head\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable cellspacing=\"0\" class=\"attributes-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eBrand\u003c\/th\u003e\n\u003ctd class=\"data\" itemscope=\"\" itemtype=\"https:\/\/schema.org\/Brand\" itemprop=\"brand\"\u003eAPR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eEmission Code\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eProduct Type\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eValve Spring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eQuantity\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eRetainer Material\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e6AL4V Titanium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eRetainer Weight (grams)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eSeat Material\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e4140 Chrome Molly Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eSpring Material\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eASTM A877A OTSC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eSpring Style\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eBeehive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eSpring Weight (grams)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e29\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eUPC\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e810904030986\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003ePart Number\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eMS100089\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eFounded 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 \u0026amp; 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.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg src=\"https:\/\/images.holley.com\/prop65_warning.png\" data-mce-src=\"https:\/\/images.holley.com\/prop65_warning.png\" data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eWarranty:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca href=\"https:\/\/10secondracing.com\/pages\/apr%C2%AE-product-warranty\" data-mce-href=\"https:\/\/10secondracing.com\/pages\/apr%C2%AE-product-warranty\" data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0030\/5315\/8515\/files\/APR_LOGO_2bfb9bc8-59f2-4489-80bd-6555362b6aa9_2048x2048.png?v=1622758058\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0030\/5315\/8515\/files\/APR_LOGO_2bfb9bc8-59f2-4489-80bd-6555362b6aa9_2048x2048.png?v=1622758058\" data-mce-fragment=\"1\"\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"APR®","offers":[{"title":"Default Title","offer_id":39833570639966,"sku":"MS100089","price":914.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0030\/5315\/8515\/products\/ScreenShot2022-10-22at2.02.31PM.png?v=1666461873","url":"https:\/\/10secondracing.com\/products\/apr%c2%ae-12-13-audi-tt-rs-quattro-valve-spring-seat-retainer-kit","provider":"10 Second Racing","version":"1.0","type":"link"}