Quote:
Originally Posted by serialk11r
All I have to say to your post is, BMW and VW use electronically actuated wastegates to bypass the turbine at part load.
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Again. I don't think you understand how a turbo really works. A waste gate doesn't bypass the turbine. It bleeds off exhaust pressure to control compressor speed. Will it divert a little exhaust gases, of course. But it doesn't bypass the turbine. Just prevents drive pressure to build up which is what generates the "boost".
Sounds like they do this to make the exhaust more free flowing and not to bypass the turbo. If they did fully bypass the turbo it would become a massive intake restriction.
Variable geometry turbine turbochargers do this much better.