VALVOLA POP OFF 25mm Citroen Ds3 C4 Ds4 C5 Picasso 1.6 THP turbo Coupe' Grand C4 VALVOLA POP OFF 25mm Citroen Ds3 C4 Ds4 C5 Picasso 1.6 THP turbo Coupe' Grand C4 Valvola Pop off a ricircolo, doppia via da 25mm , completa di tutto come in foto Doppia molla , spessori, tubazione Valvola in alluminio , lavorato al CNC high profermance universal auto 25mm bov aluminum bov auto racing turbo charger Blow Off Valve The Blow-Off valve (BOV) is a pressure relief device on the intake tract to prevent the turbo’s compressor from going into surge. When the throttle is closed rapidly, the airflow is quickly reduced, causing flow instability and pressure fluctuations. Surge can eventually lead to thrust bearing failure due to the high loads associated with it. Blow-Off valves use a combination of manifold pressure signal and spring force to detect when the throttle is closed. When the throttle is closed rapidly, the BOV vents boost in the intake tract to atmosphere to relieve the pressure, helping to eliminate surge. Blow-Off Valve 25mm Billet Aluminum Body Anodized Finish CNC-machined Spedizione con corriere espresso !