Granatelli 50mm Viper Series Adjustable Atmospheric Turbo Blow-Off Valve – 540198

GRANATELLI VIPER SERIES

FAST PRESSURE RELEASE, ADJUSTABLE RESPONSE — AND YES, IT MAKES THE RIGHT NOISE.

The Granatelli 540198 Viper Series 50mm Blow-Off Valve is a high-flow vent-to-atmosphere turbo BOV designed for street, street/strip and race applications.

Its adjustable spring preload lets the valve response be tailored to the vacuum and boost characteristics of the specific turbo system, while the 50mm valve provides fast pressure relief when the throttle closes.

What Makes the Viper Different?

The Viper combines a 50mm high-flow valve with externally adjustable spring preload. This allows the blow-off valve response to be fine-tuned to the engine’s vacuum characteristics and turbo boost setup rather than relying on one fixed calibration.

Is the Viper Right for Your Setup?

GOOD FOR • Turbo street cars • High-boost builds • Drag and race cars • Adjustable BOV setups • Vent-to-atmosphere systems

VERIFY FIRST • Atmospheric venting compatibility • BOV mounting flange • Vacuum reference source • Engine-management strategy • Available charge-pipe space

Product Specifications

Part Number	540198
Product Type	Turbo Blow-Off Valve
Valve Size	50mm
Discharge Style	Vent-to-Atmosphere
Adjustment	Adjustable Spring Preload
Construction	Billet Aluminum
Fitment	Universal Custom Turbo Applications

MAF VEHICLE NOTE: A vent-to-atmosphere blow-off valve can affect drivability on some mass-airflow-metered vehicles because previously measured air is released from the charge system. Verify your engine-management configuration before installation.