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Originally Posted by Y-TRY
Thanks for the help, Jason. I have some turbo-related questions in the technical forum that you sure could help me out with. But here's one of them that no one has addressed:
Why have I not seen any turbo applications with the centrifugal-style BYPASS valve in lieu of the BOV and/or Wastgates? Is it because there is something different with how the supercharger produces boost compared to the turbo, that somehow negates the use of a bypass? Or is it simply because I've never seen a turbo/blow-through at all, thus never seen the symptom or it's solution? (Maybe this isn't a problem with EFI'd turbo cars so it's never been needed) It seems like the Bypass valve would work great in a turbo application and could possibly fix the problems I'm having. There must be a reason why I've never seen it used. Have any of you guys had experience with this type of valve in a turbo application like mine? What are the pitfalls? What kind of info can you give me?
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I have never heard someone use the term centrifugal BOV or wastegate. Tial & Vortech make BOV's that release pressure 360 degrees to the atmosphere. Is this what you are after? A bypass(recirculation) is a BOV that is routed back into the intake pipe before the compressor. This is necessary if the vehicle uses a air metering device before the compressor. The metering device has accounted for that air and placed the proper pulse width at the injector. When you release the air out to atmosphere you will have a rich condition and the vehicle will surge. A Manifold Absolute Pressure(MAP) or Speed Density(SD) system can release the pressure out to atmosphere. This is because the MAP sensor is placed in the intake manifold and the air isn't accounted for until it reaches this point.
Superchargers also use something called a bypass valve for releasing pressure while cruising. This is something all together different as well. Superchargers produce unwanted boost during certain cruising situations and the bypass valve will release this boost for driveability and mileage.
Jason