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Originally Posted by submachine69
i have a 91 twin turbow 300zx and latly if i get on the freeway i get it hot and then all of a sudden i have no boost at all, i was whondering what all factors play in to the car haveing boost, i know u must have good cylinders that can push out hot exhaust gas to spin the turbo and u also need a free flowing exhaust too, but i was whondering how the waste gate controlled and is it only vacuum lines or is there a valve that can allow vacuum or prevent it that may make the waste gate stick open. i cant hear the turbos spool up so i know its not on the intake side. please if anyone has run into a simalar situation.
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If you are bone stock your ecu controlls boost... if you have an aftermarket boost controller it will have a solenoid that controls the boost. You may just have a major vacuum leak. since any vacuum line connected to the plenum turns to positive pressure when you boost you wouldn't really hear a major leak until it's under boost. Listen for any hissing under the hood at idle. You can also try a boost leak tester.