ZR-1 Net Registry Forums - View Single Post

Aurora40 · 11-29-2005

Multi Port and Tuned Port are basically the same thing. There is an injector in each intake port. As opposed to Throttle Body Injection, where there is one or two injectors at the throttle body (like an electronic carburator).

The ZR-1 is actually sequential also, meaning the injectors are fired individually. On TPI L98's they are all (or several are) fired at the same time, meaning fuel will pool a bit waiting for a piston to hit the intake stroke.

Edit: I wish they'd put some other lettering on the molding than "Tuned Port Injection" for the 1990. Something to differentiate it from the L98 car.

11-29-2005	#2
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,704	Re: Tbi Tpi Mpi Sfi, C4 Efi. Multi Port and Tuned Port are basically the same thing. There is an injector in each intake port. As opposed to Throttle Body Injection, where there is one or two injectors at the throttle body (like an electronic carburator). The ZR-1 is actually sequential also, meaning the injectors are fired individually. On TPI L98's they are all (or several are) fired at the same time, meaning fuel will pool a bit waiting for a piston to hit the intake stroke. Edit: I wish they'd put some other lettering on the molding than "Tuned Port Injection" for the 1990. Something to differentiate it from the L98 car. Last edited by Aurora40; 11-29-2005 at 11:47 PM.