and.
.... TechnicallyDump valves
(also known as blow-off valves) are not a new idea and have been around since the early 1980 s.Their function is to release un-used boost pressure when lifting off the throttle of a turbocharged car.When accelerating the turbocharger produces boost (positive pressure)which is used to Force feed the engine with large amounts of compressed air.When you lift off the accelerator,the throttle butterfly is closed and the boost has no escape route,so it backs up through the intercooler and causes back- pressure that tries to stop the turbo from spinning,this is known as compressor stall .By fitting a dump valve,every time you release the throttle the excess boost pressure will be released,which means a significant reduction in turbo lag ,contributing towards faster pick-up between gear changes.In extreme cases on cars with high revving engines or large turbochargers,the shaft within the turbo has been known to snap when no form of dump valve has been used.A counter product of the reduced back pressure is that the turbocharger itself will last longer as less thrust load is placed on the delicate internals.These two reasons are why re-circulating dump valves are now fitted as standard equipment on most turbocharged production cars,albeit of sometimes compromised quality. After many years of exhaustive testing on a wide variety of both road cars and high powered race cars, Bailey Motorsport introduced the Piston design in 1997.Piston dump valves have many advantages over their diaphragm style counterparts, including faster reaction times,increased boost capability and in the case of our EVO valve the ability to work on cars with airflow meters.(not possible with diaphragm type dump valves).hope that helps.
