If you drive a turbocharged vehicle and have been browsing upgrades, or are just starting to look into the world of turbos, you may have seen parts listed as BOV (Blow Off Valve) and DV (Diverter Valve). Initially, it’s easy to see these parts side by side and assume that they are exactly the same. While they do both operate with the turbo and replace the same part, they actually function very differently and have their own unique applications.
When your turbocharged Volkswagen, Audi, or BMW vehicle is spooling up under heavy acceleration, and then that acceleration stops abruptly during a shift or when you take your foot off the accelerator, that pressurized air from the turbo has nowhere to go, so it heads back towards to the turbocharger, putting tons of pressure on the turbo itself. BOV’s and DV’s help mitigate this pressure by releasing or redirecting that air, which is important for the health and longevity of your turbo system.