I have an streetported S4 T2 engine with S5 NA 9.7 rotors wich is NA now, but im considering turning the car into a track toy, so more hp would be nice.

I have everything i need except a turbo and wastegate.
by everything i mean:
Apexi PFC, with 1x AFR and 2x EGT sensors connected to Datalogit.
Aem water injection.
Fmic with tubing.
BOV.
Exhaust manifold with T4 flange with runner for eksternal wastegate.

I have an NA drivetrain in the car, and one spare NA transmission, when both of those are dead i plan on converting to an FD transmission(wich i got from a friend for helping him with his 1jz conversion.)

So my first power goal is around 250whp, so that the NA transmissions lasts a while. So i want a turbo that suits those numbers and spools up early,

As of now i am leaning towards a Tial 38mm wastegate and borg warner S251 turbo(or similar), since those are good quality and seems to be good value.

Any input would be good, i'm just going from what i can find on the web, so it's not based on any real knowledge or experience.

 

you are probably also going to need if you don't already have, an external fuel pressure regulator, injectors, fuel pump. the wastegate and the turbo are good but depending on if you need more power later you might want to choose a little bigger turbo.

 

Forgot to mention that i have 550primary and 720 sec injectors, isn't that enough for aprox 300hp? And as for fuel pump i have a walbro 255.
I don't have an adjustable FPR, but it's on my list of things to buy.

 

Id look into 4x 720cc for a 300hp goal.