TiAL 002990 QR Recirculating Blow Off Valve 50mm Purple 6 PSI 29mm Port

The TiAL QR is the compact recirculating version of the legendary TiAL Q blow off valve, engineered for turbocharged and supercharged vehicles that require recirculated BOV discharge air to maintain factory-quality drivability. It is fully outline-interchangeable with the TiAL Q and original BV50, and features a large 50.5mm (1.98") valve for outstanding flow capacity.

Many factory turbocharged setups — particularly those using a mass airflow (MAF) sensor — route blow off valve discharge air back into the intake tract. Venting to atmosphere on these systems upsets the air/fuel ratio and creates a rich condition at throttle lift-off. The QR recirculates this air back into the intake system, eliminating that issue while still delivering the performance and response of a premium aftermarket BOV.

This specific unit (MPN 002990) comes in Purple anodized finish with a 6 PSI spring and a 29mm recirculation port. The valve uses the standard TiAL V-band flange system and can be converted into a standard atmospheric Q BOV simply by swapping the bottom piece.

Key Features:

• Large 50.5mm (1.98") valve for exceptional flow
• CNC-machined 6061 aluminum alloy body and all internal components
• Viton O-ring valve seal clamped in place to prevent sticking or pullout
• Teflon-lubricated, hard anodize-coated valve stem and guide for wear resistance
• V-Band aluminum mounting clamp with stainless steel hardware for a clean, corrosion-resistant installation
• Banjo-type aluminum air fitting with oversized 10mm hose barb for quick actuator response
• High-temp silicone Nomex-reinforced diaphragm for long service life
• Compatible with turbo and supercharged applications (Paxton, Vortech, etc.)
• Convertible to standard atmospheric Q BOV by swapping the bottom piece
• Available recirculation port sizes: 25.4mm (1.00"), 29mm (1.14" GTR), 34mm (Subaru/EVO/DSM), or 38.1mm (1.50")
• Spring pressures available for a range of idle vacuum levels and supercharged applications

What's Included:

• QR Assembly with 29mm return fitting (installed)
• TiAL V-Band clamp
• V-Band weld flange (cut for 2.5" pipe)
• TiAL banjo-type air fitting
• High-pressure O-ring

The TiAL QR installs using the same standard TiAL V-band flange as the Q and BV50, making it a direct upgrade path for existing TiAL flange installations. Spring pressure selection should be based on idle vacuum, not target boost level.