This system integrates a turbocharger before the carburetor or throttle body in an engine’s induction system. This placement forces the turbo to “draw” the air-fuel mixture through it, rather than pushing pressurized air into a downstream carburetor. A common application was found in older, performance-oriented vehicles seeking increased power output.
The advantage of such configurations lies in their relative simplicity regarding fuel management. Because the carburetor still meters fuel based on vacuum signals, complex electronic fuel injection systems are not initially required. Furthermore, historically, this was a readily achievable method to enhance engine performance before the widespread adoption of sophisticated electronic engine controls. However, the practice has drawbacks, including potentially uneven fuel distribution and increased risk of fuel condensation within the turbocharger.
