i was wondering if anyone knew what the stock throttle body and fuel injectors sizes are for an 2.8 litre firebird?
i was also wondering what you guys think i can get for hp gains , with a new mass air flow sensor, fuel rail, 72 or 75 mm throttle body (the guy said it was one of the two) and 36 pound injectors(both of which seem a lil big for a 2.8 litre), and a stock intake manifold thats been ported.

 

What woudl be a good size injector for a 3.1 v6? what would the horsepower gains be on the 2.8 and 3.1? Thanks!!!

 

please use the search button first, ok where to get started......i would say to get headers, and a catback first if you dont already, after that then i would worry about porting your intake, then if you can switch throttle bodies. now ive never heard personally about other throttle bodies that will bolt on these cars but????? i have no idea..so ill leave that topic for someone else. if you need to raise fuel pressure im sure your stock ones are not quite maxed out...maybe. so intall a adjustable fuel pressure regulator, and raise it. someone else will chime in with a more specific answer to that, or a better one...... then suspension. deffinently.

 

Blackbody - whoever gave you those numbers on the fuel injectors needs another hobby. Stock injectors on the 2.8 and 3.1 are 15#/hr.

 

i thought they sounded to big to be in a 2.8... ill have to talk to the guy again sometime today

 

actually, 2.8s came with 13lb/hr injectors. both motors came with 52mm throttle bodys.

 

In any case I don't think the throttle body and injectors are the horsepower cork in these things.

 

maybe the person was thinkin v8? like the 305 tpi?