TiAL 002989 QR Series 50mm Recirculating Blow Off Valve

The TiAL QR is the compact recirculating version of the legendary TiAL Q blow off valve (BOV), engineered for turbocharged and supercharged performance applications. The QR is a recirculating valve based on the high-performance TiAL Q, offering optional recirculation ports in 25.4mm (1.00"), 29mm (1.14") for the Nissan R35 GTR, 34mm for Subaru/EVO/DSM, or 38.1mm (1.50") configurations. It uses the standard TiAL V-band flange and can be converted into a standard Q BOV by simply swapping the bottom piece.

With a TiAL 50mm blow off valve in place, you can improve the long-term durability and reliability of your turbocharger by preventing compressor surge during closed-throttle and high-vacuum conditions. The QR is suitable for use on turbocharged and supercharged applications, including Paxton and Vortec supercharger setups.

Key Features:

• Body and all internal components are CNC-machined from 6061 aluminum alloy, featuring a large 1.98 in (50.5mm) valve.
• V-Band design aluminum mounting clamp provides a clean, unique appearance with stainless steel hardware for long-lasting, corrosion-free performance.
• Valve seal utilizes a Viton O-ring clamped in place to prevent sticking to the seat or pulling out.
• Valve stem and guide are Teflon-lubricated and hard anodize-coated for superior wear resistance.
• Includes a TiAL machined aluminum banjo-type air fitting and bolt with an oversized 10mm hose barb for quick actuator response, backed by a high-temp silicone Nomex-reinforced diaphragm for long service life.
• Offered with a variety of springs for different vacuum levels, including a special spring for supercharged vehicles.
• Color anodized aluminum housing available in silver, black, red, blue, or purple.

What's Included:

• QR Assembly with recirculation return fitting
• TiAL V-Band clamp, V-band weld flange, TiAL air fitting, and high-pressure O-ring.

The included weld mounting flange is available in aluminum, mild steel, and stainless steel, cut for 2-1/2" pipe, paired with a CNC-machined aluminum V-band mounting clamp with stainless steel hardware.