i have to 550's and 720 secondaries and a 3rd gen fuel pump, will that be enough to hold around 15 psi on a streetported engine. the turbo is a small garrett, slightly larger than the stocker.

 

I personaly, think your going to come up a little short on fuel

 

i do too.. but the option of running 720 primaries and 780 secondaries is at at. i think the combined 3000cc of fuel might be able to handle 15psi, but what about the Fd fuel pump?

 

I dont know that much abotu FD's. whats the lph on the fuel pump? But if your running that much fuel I'd get a walbro 255. Then 15 Psi should be fine. but you need to know the psi max on your turbo. If you dont have an A/F ratio gauge, then get one. No one wnats a lean Motor. especially since you streetported it. All that money to a blown motor.

 

im running 14psi on 550 primaries and gslse 680cc on the secondaries with a walbro fuel pump and its running alright, 14psi is my limit after that it runs lean. right now my afr is around 11.4 to 11.6