The main purpose of the dump valves is to improve the response of the turbo by quickly releasing the boost pressure before the turbo stalls.
They are made from polished aluminium with a brass piston and a rubber diaphragm, meaning they can easily cope with boost pressures up to 1.2 bar with the supplied spring.
There is an alternative hard spring for boost pressures above 1.2bar and also a soft spring available for very low boost applications.
Blitz dump valves also feature "Dual Drive" for maximum response, a small port for low boost and a larger port for high boost.
They are also tension adjustable.
Super Sound, Dual Drive, Dump Valve kit
Starlet Turbo, EP82, EP91, 4E-FTE
This kit includes everything needed to install onto your vehicle.