GReddy Blow Off Valves are easily adjustable to eliminate compressor surge and preventing premature boost leakage, while increasing boost response between shifts. Each valve is made of durable cast and billet aluminum frame and the valve to diaphragm ratio provides performance that cheap piston types cannot offer. The spring stiffness adjustment screw and the three different sizes give the GReddy user the option to match vehicles with mild upgrades to heavily tuned engines.

Type RZ Features:

High capacity performance in a compact frame

* With the use of the high quality valve and diaphragm control system, the type-RZ was created to be the most reliable Blow off valve system available.

* New designs allow for high capacity and performance that rival high performance Blow-off Valves, While being more compact and lighter-weight.

Ultimate Discharge Sound

* The unique 8 discharge ports in the CNC machined aluminum discharge funnel draws surrounding air to amplify blow-off sound.

Large 40mm Valve

* The CNC machined aluminum valve is coated with a hard anodizing, to withstand extreme friction, maintain an airtight seal and increase durability.

Quick Response

* To ensure proper valve movement, a durable, airtight, pressure resistant Bellofram diaphragm is used.

* The Short valve stroke allows a compact top housing design. This smaller top housing volume also adds improved valve response.

Dual Spring System

* A carefully selected spring rate, prevents premature discharge under high boost pressure and increases valve speed for quick response application.

Adjustable Spring Rate

* The spring tension can be tuned by the adjustment screw, to suit mass applications.

Mounting Flange

* The Type-RZ uses the same mounting flange as Type-S and the Type-RS (flange not included).

There may be some applications, where the Type-RZ Will not be able to replace the GREDDY valve on some bolt-on blow-off valve Kits.