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I've heard of some interesting results from guys running diesel variable geometry turbos (VGT). Instead of using a computer to electronically control the vanes in the exhaust housing, they use a waste gate actuator. Those let you adjust from 3cm^2 up to 24cm^2. I forget the AR equivalents.
They let the boost build to about 5-7psi then start to open the vanes for more flow.
There are a few DSMs trying to use them for ****s and giggles. Too bad they are all backyard builds and have never seen a dyno.
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