Originally Posted by Redsteel
that's a "blow through" carb. draw theough uses the engine vaccuum to draw the air into the engine. blow through is what is used on a turbocharged car
there are two different set ups for a turbo motor, draw through and blow through.
a draw through motor means that the turbo is downstream of the carb or throttle body, and there is only atmospheric pressure on the fuel delivery system.
a blow through system is where the turbo is upstream of the carb or throttle body, and the fuel delivery system does see boost pressure.
each has their advantages and disadvantages, and each has ways to overcome the disadvantages.
i prefer the blow through system for EFI cars as the only thing you need to install in the system is a blow off valve to prevent damaging the turbo system.
a draw through system requires that the turbo bearing be properly sealed to prevent fuel from damaging the bearing and shortening the life of the turbo.