BOV Question
BOV Question I was talking with an import friend of mine, who does a lot of WRX's and Supra's, and he said that with a high stalled auto, a BOV was not required because of the way the car shifts you wont get any boost surge (not exactly sure what he called it, i forgot)...does this make sense or is he blowing sunshine up my ***?
BOV's and Bypasses are benefical to a M6 or A4, in the A4 it provides benefits other than venting during shifts. It will keep pressure from being slammed back into the impeller blades when the throttle closes...senarios...
After a full 1/4 mi pass when you let off, if you didn't have a BOV or Bypass valve you would get compressor surge like a **** because the throttle snaps shut and you are now on the brakes, the boost you just built up says "screw it, lets head back where we came from..." and thats back to the form of FI you are running. Also lets say you had to lift because the car lost traction during the pass due to a crappy track, you would be able to vent the excess pressure every time you lifted if there was a bypass or BOV there. Without one, you would get the same compressor surge because you snapped the throttle shut to regain traction or control of the car. ALSO on burnouts at the track, you need to vent the excess pressure when your burnout is done. All three of these issue always arise during my track outings in my high stalled auto car. If you have a stock bypass from your kit, it already does this type of thing but recirc's back into the intake stream. Once you start pushing more that 9 psi/big HP its really time to upgrade to a higher flowing bypass or BOV.
After a full 1/4 mi pass when you let off, if you didn't have a BOV or Bypass valve you would get compressor surge like a **** because the throttle snaps shut and you are now on the brakes, the boost you just built up says "screw it, lets head back where we came from..." and thats back to the form of FI you are running. Also lets say you had to lift because the car lost traction during the pass due to a crappy track, you would be able to vent the excess pressure every time you lifted if there was a bypass or BOV there. Without one, you would get the same compressor surge because you snapped the throttle shut to regain traction or control of the car. ALSO on burnouts at the track, you need to vent the excess pressure when your burnout is done. All three of these issue always arise during my track outings in my high stalled auto car. If you have a stock bypass from your kit, it already does this type of thing but recirc's back into the intake stream. Once you start pushing more that 9 psi/big HP its really time to upgrade to a higher flowing bypass or BOV.
