The TiAL Sport QR is the recirculating version of the Q blow-off valve, routing vented air back into the intake through a 34mm discharge tube so it works cleanly on mass-airflow engines. It has a 51mm valve, all billet aluminum construction with a black anodized cap, a Nomex-reinforced silicone diaphragm and an M10 vacuum port, and ships with the 10 PSI spring installed. The QR bolts to any standard TiAL BOV flange without welding and shares its lower body with the Q for a vent-to-atmosphere conversion.
| Type | 51mm recirculating blow-off valve (QR Series) |
| Valve Diameter | 51mm |
| Discharge Outlet | 34mm recirculating |
| Mass Flow | 31 lb/min |
| Pressure Range | 2/12 PSI |
| Fitted Spring | 10 PSI |
| Body | Billet aluminum |
| Color | Black |
| Included | BOV assembly, air fitting set, weld flange, clamp assembly, weld flange O-ring |
| Part Number | 004939 |
Documents: Bench Testing Instructions (PDF) | Routing & Plumbing Options (PDF)
Shipping: In-stock orders placed before 4 PM EST ship the same day, with standard, expedited, and overnight options available at checkout. Backordered items ship as soon as our distributor restocks — contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
