i was wondering it the fc3s 91 turbo II have fuel rails

 

and if so where can i buy them from so i can put in my 720cc

 

All EFI engines have fuel rails.

Most top-feed 720cc/min injectors are drop-in replacements for the stock ones.

 

just make sure they are the same impedence

 

S4 injectors run low impedance, S5 injectors are high impedance.

 

ya... what he said

GSL-SE injectors are 680, and ive been told they flow more than that. around the 700 range. but I guess you already have injectors so... ill shut up

 

I was told by a tech guy from rx7.com not to mess with the fuel injectors because the stock ones supply plenty of fuel even for 400 hp. thats just what he said.

 

He's wrong. They give advice like that so they sell more engines.

 

Since you have an s5, If there like greddy top feed 720s then you'll want to put some 10w/10ohm resistors on since those are low impedence injectors. If there just stock bored out to 720cc by like rc eng. then u can just put them in and use them with no injector harness modification. Your secondary fuel rail is more then adequate for 720cc primary use.

 

I believe 87 1/2 turbos also went to high impedance, but for sure 88 turbos had them...