TiAL Sport Q Series 50mm Blow Off Valve BOV Dump Valve Black 10 PSI Spring V-Band - Fits BMW N54 135i 335i 535i Z4 35i 1M - Atmospheric Vent Turbo Pressure Relief Diverter Valve Upgrade - Billet Aluminium - Part Q.10B

Part number: Q.10B

Upgrade your turbo setup with the TiAL Q Series 50 mm atmospheric dump valve in black, engineered for rapid boost release, crisp throttle transitions and rock solid reliability. This 10 psi spring rate unit is a favourite for the BMW twin turbo N54 crowd and other performance builds seeking fast response, surge protection and that unmistakable vent to atmosphere sound.

At MJ Modifications we have installed and run this Q Series valve on customer cars with outstanding results. Idle quality remains stable, boost control is consistent and the valve reacts instantly under hard load changes. Customers love the quality, the finish and the performance.

• Q Series revision of the original TiAL design, bolts to a standard TiAL weld flange, no re-welding required
• Class leading flow, independently proven to move around 60 percent more air than the earlier design
• Single unit supports very high power builds, up to 1,800 hp
• CNC machined 6061 aluminium body and internals, lightweight and durable
• Stainless steel V-band clamp for a secure, corrosion resistant install with a clean look
• Viton valve seal is positively clamped in place to prevent sticking or pull out
• Teflon lubricated, hard anodised stem and guide for long service life
• Nomex reinforced high temperature silicone diaphragm in the actuator
• Oversized 10 mm banjo air fitting for ultra fast actuator response
• External venting for maximum sound and surge control

Supplied in the box

• TiAL Q Series 50 mm valve, black finish, 10 psi spring
• V-band clamp
• TiAL air fitting with banjo bolt and 10 mm hose barb
• High pressure O-ring

Who is it for

Ideal for turbocharged and centrifugal supercharged applications, including systems like Paxton and Vortec. Hugely popular on the BMW N54 platform for sharper boost control and compressor surge protection on tuned 135i, 335i, 535i, Z4 35i and 1M models.

Why enthusiasts choose it

Think faster boost dump under lift off, stronger protection against compressor surge, higher flow capacity for remapped engines and big power builds, and premium materials that stand up to heat and abuse. This is a performance pressure relief solution that works on the road and on track.

Search friendly terms customers use

Turbo dump valve, vent to atmosphere valve, boost release valve, turbo pressure relief valve, compressor surge protection, diverter valve upgrade, BOV upgrade, Q series 50 mm, V-band BOV, billet aluminium valve, performance dump valve for BMW, N54 tuning parts UK, whoosh valve, atmospheric valve, charge off valve, turbo bypass upgrade, high flow BOV.

Key specifications

• Valve diameter 1.98 in, 50.5 mm
• Spring rate 10 psi
• Finish black
• External venting design

Professional installation

For fitting and setup, we recommend booking with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a tailored quote and friendly advice.