Tuned Port Injection is a specific multi-port electronic fuel injection system introduced by General Motors for their older V8 engines. It uses long, tuned intake runners designed to boost low-end torque. While it drastically improved drivability over carburetors, the long runners restrict high-RPM airflow, limiting top-end horsepower.
Heard on the job
We're pulling the old TPI setup off the Camaro and swapping to a newer manifold for better top-end flow.
Also heard as
- Tuned Port Injection
Related terms
EFI
Electronic Fuel Injection is a computer-controlled system that atomizes fuel into the engine.
Intake manifold
The engine component that distributes incoming air or air-fuel mixture evenly to each cylinder.
Throttle body
A housing containing a pivoting valve that controls the amount of air entering a fuel-injected engine.