It’s a well known fact that the factory bypass valves used on the VAG 2.0L turbo engines (like the ones pictured on the left) are prone to leaking and even bursting/cracking over time and when subjected to high boost.
In its standard form, the TSI, FSI and TFSI engines run approximately 9-10psi of boost pressure. While the plastic factory bypass valves are adequate at this level of boost they may still begin to leak after a while. Increase the boost above 10psi and we really start seeing the shortcomings of the factory valves. The piston in the factory unit can stop sealing correctly and with prolonged and or, aggressive usage, the valves have been known to fail.
A small amount of leakage might not have a great effect on performance but as the leak gets bigger it will have a negative impact on the performance of your turbo and eventually lead to the valve’s failure.
When modifying your car you want to extract as much power and performance as your can and achieve maximum efficiency the mods can provide.
That’s why we have designed a two-piece piston with O-ring seals to ensure there is no boost pressure loss. This, coupled with a rugged, billet aluminium body makes the Kompact valve a more reliable, longer lasting and better performing solution.

ABOVE: A two piece piston and a tough, bullet aluminium body can handle up to 30psi of boost pressure.

ABOVE: The O-ring seals prevent boost leakage and ensure the valve copes with the demands of high performance modifications.

ABOVE: All Turbosmart Kompact VAG valves use O-rings on the body and on the piston to avoid boost leaks and provide long and reliable working life-span of the valve.