A PT-67 is a 67 mm turbo. Boost is controlled electronically through a set of wastegates on a twin setup. The wastegate is a valve that either stops or allows exhaust gas to bypass the turbo. If the valve is open all the way, very little exhaust from the engine goes through the turbo, it spins slower, and you get little boost. If you close the valve all the way, all gasses will go through the exhaust turbine and turn it as fast as possible. If you did not run a wastegatem, boost would probably climb upward of 50 psi depending on the setup. This would be bad.
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Twin Turbo LS1 '71 Chevelle
1000 hp 93 octane street car
6 speed
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