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In the US, this kind of single-point injection was marketed as 'throttle body injection' (TBI, by GM), or 'central fuel injection' (CFI, by Ford). Mono-Jetronic is different from all other known single-point systems, in that it only relies on a throttle position sensor for judging the engine load.
It is usually installed right behind the throttle valve in the throttle body. Single-point injection was a relatively low-cost way for automakers to reduce exhaust emissions to comply with tightening regulations while providing better "driveability" (easy starting, smooth running, freedom from hesitation) than could be obtained with a ...
Holley-style carburetors powered every NASCAR Sprint Cup team and every NHRA Pro Stock champion until both series eventually switched to electronic fuel injection (EFI). NASCAR Sprint Cup engines still utilize a Holley throttle body and Holley EFI is the spec EFI system in NHRA Pro Stock.
Single-point injection (also called 'throttle-body injection') [20] uses one injector in a throttle body mounted similarly to a carburettor on an intake manifold. As in a carburetted induction system, the fuel is mixed with the air before entering the intake manifold. [18]
The automatic mixture control, if equipped, is mounted either on the boost portion for throttle bodies with two or more throats, or on the throttle body itself for the single throat models. The fuel delivery component is either remotely mounted at the "eye" of the engine's supercharger or at the base of the carburetor body. The fuel is sprayed ...
The availability in USA for the EA71 ended in 1990 on the hatchback models. It came with a carburetor and the last editions for JDM featured throttle-body injection, found on the "Maia" editions of the third generation Subaru Leone. The engine came either with solid lifters or hydraulic lifters.