My current fuel system is rather inaddequate, so I need some opinions on what I should get. I plan to install a gt35/40 later in the year, but in the mean time it has to deal with a stock s5 turbo. I'm mostly concerned with injector and fuel pump sizing.

I'm thinking 2 550cc injectors, 2 880cc injectors, some kind of 600hp bosch pump, regulator, surge tank, stock s4 na pump to supply the surge tank and new lines. Then when I can afford the gt35/40 I'll move the 880cc's to the primaries and get some 1200-1600cc secondaries.

Does this sound reasonable?
Will this be limiting a gt35/40 at high boost (>17)?
If so, what would you suggest?
Would a 3" exhaust be limiting?
How will larger fuel lines effect the stock turbo?

 

Sounds good.
you will not be at the limit.
The T3 flange is your limiting factor, not the 3" exhaust.
-6an lines will be sufficient.
Carl

 

Sounds good (1600s)
you will not be at the limit.
The T3 flange is your limiting factor, not the 3" exhaust.
-6an lines will be sufficient.
Carl

 

I run 17 psi with 550 pri and 1600 sec, supra TT Nippondenso fuel pump and SX rising rate fuel pressure regulator. Seeing about 84% duty max with that boost and fuel system. I am sure you could get about 19-20 psi out of this set-up, I also made 404 rwhp with stock motor at 15.5 psi.

 

Cheers

Good to know I'm on the right track.