i just been looking at different mods and researching, but fuel is defiantly not my strong point and still have lots to learn. one particular item the caught my eye was the pineapple racing Xcessive FD Lower Intake Manifold, and i guess my question is what kind of extra power could you get from those extra two injectors ? or is it for the guys with huge turbos to keep their **** from runing too lean ?

http://www.pineappleracing.com/index...PROD&ProdID=25

 

You don't get extra power from adding, or getting bigger injectors. To get a certain amount of HP you need a certain amount of fuel. On high HP applications, the stock injectors just don't provide enough fuel. Adding injectors is just a way of increasing the fuel. It doesn't add HP, but it will support more HP.

Edit: If you want to figure out how much HP certain injector combinations will give you, go here.
http://rx7.com/cgi-local/3rdgencalc.cgi

 

well said

 

i know that for a certain amount of air you need a certain amount of fuel i understand that. i guess i asked the wrong question. at what point would you need those extra 2 injectors(about how much air going in) ? thats a nice calculator but it dosent factor in the boost and that what i really want to know

 

Boost doesn't matter. Boost is just another way of getting more air into there. The calculations aren't going to change because it was boosted air opposed to other means. The calculator will still be right no matter what PSI you're running. Put in 850cc primaries and 1680cc secondaries with the desired duty cycle, and that's how much HP you can support before you'll need extra injectors.