I just sent my ecu off to rtek to get a 2.1. Can't wait! Right now i'm just pondering on my setup, mainly fuel mods.

This is what it will break down to:

S5 BNR Stage 2 Hybrid
Greddy FMIC
Apexi Twin Chamber BOV
Apexi Power Intake
Koyo Rad
PLX Wideband
Walbro
As for injectors I was thinking 550/720. Now when I get the ecu, I can preset it for fuel. My big question is what psi can I run on? I know the only way to really tell is obviously when it gets here and see what it does down the road but I just want an idea.

 

maybe you should do 550/1000 or 720/720

 

720/720 or larger will be better. I already see as much as 74% combined duty cycle on my 550/720 setup with a stock turbo. Running a T04B H-trim (BNR stage 2) up around 14-15 psi, on the same injectors, will likely be maxing them out.

 

I've been reading that 550/720 will get me to my 300hp goal. So it should be sufficient? If I was to go larger it would be 680/720. Then eventually I would step it up to 720/1000 with meth.

 

it's easier to start with bigger injectors and tune down. Much better than pulling the whole engine if you lean out with not enough fuel and go pop.

 

550/720 can theoretically support 300whp, but they would be at max D/C or fall short. You wouldn't want to start tuning the engine, and then find out that you can't supply enough fuel to support the turbo at high boost. 720/720 would support around 350whp at most, so you'd have headroom.