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, backpressure 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.
APR is pleased to present the APR Valve Spring System.
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!
- 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 applications
- 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
Any items ordered then subsequently cancelled by the customer before delivery will incur 10% handling fee and will receive the remaining balance within 14 working days
Do we ship abroad ?
Yes we do, to almost anywhere in the world though remember the postage is often high when shipping anything bulky. Most bulky items we export will go by UPS so you can track the package online, Delivery times vary due to stock and import checks.
However there are a few countries we do not ship to, some of these include: Thailand, Malaysia, Indonesia, Russia, Nigeria, Macedonia, Syria, Ukraine, Lebanon.
Why is postage on bulky items to some countries expensive compared to some other companies ?
For both yours and our safety we use well known couriers such as DPD Local and UPS for shipping, then we know exactly where it is in the world at any time and we know its going to arrive safely. We can now ship using standard post on some items, however using all methods you may incur import charges when you receive the goods for which we cannot be responsible for.
How do I place an order if I live within the UK ?
You can either order here in our online shop or you can phone us or email us, using the following number/address are below.
Phone: +44 (0)1945 429000
How do I place an order if I live outside the UK ?
You can order online or by phoning or emailing us.
Phone: +44 (0)1945 429000
Yes we offer free fitting on most Milltek Catback systems, Just select the option at the checkout
No, Due to our Public Liability Insurance we do not fit any customer supplied parts.
Yes depending on how long the job will take and if you are happy to wait, We have a waiting area inside our reception
Yes, But please be aware most exhaust systems will not fit in the back of the car it is being fitted to! We will help cut the exhaust into sections to aid you taking the system back with you. We allow 7days for collection of your old exhaust, after this time we will dispose of the system.