Group, One source of easily adjustable waste gates is turbo motorcycles. There was a excellent
poppet valve waste gate on the Yamaha 650 turbo. The bike used a diaphram actuated by inlet
manifold boost to open. The standard opening was at about 5-6 psi manifold pressure. The trick was
to put low pressure regulator in line, and viola! instant dial a boost with a max of about 12-16
psi manifold pressure. Bill Jepson

 
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