I'm thinking about getting some 650cc injectors and getting a fuel rail for it. It seems a little to easy to install and even the buy. Is there any other parts I'm missing or need to upgrade as well?

 

are you doing anything else to warrant the need for more fuel?

 

I think this is a bad idea unless you are running FI. The stock EMS will likely have a tough time with bigger injectors and even if it doesn't, I don't think there is any gains to be had.
The only "upgrade" would be to stick with the same size and buy an aftermarket name brand that you think will be better than the OEM.

 

All i want to know is why?

 

asssuming you have an engine that needs 650cc injectors you'll need

fuel pump
return fuel kit
ecu/retune

 

yea well I'm planning on going FI this coming january, but stil undecided. I currently have nismo headers, nismo CAI, Unorthodox pulley kit. I mean for right now what I really want is to gain as much HP as I can before going FI.

 

I would wait until you are sure you are going FI. No need to waste the time and money for minimal gains.

 

At WOT an NA Z runs pig rich. IOW - more than enough fuel is available for the amount of air you can get through the system. If you want to get as much HP as you can without going FI, get a tune after you do all the NA mods.

 

Yea, I guess I will wait. Hou about hitting u enging internals such as cams, pistons, valves?

 

If going F/I, definitely get valves they are pretty much mandatory. Pistons and cams are optional.

 

What?

WHAT??

 

Get nitrous.

 

Get an F-16.

 

the short answer: it depends

the long answer: on your budget, your goals, your skill level of building/owning a car that will be that significantly modded. If you're going this route, the first thing you need is a daily driver