Will this fuel setup work?

[boostedinwyo]

Here is my scenario:
I have a 20g, Hks f-con, 255 walbro, denso 550s, 3in turbo back, spearco fmic--I am curious if I can run 18 psi on pump gas on the street with this setup?

 

[larryd]

you might be running a little low on the injector size with 550s and a 20G but 18psi isnt really all that much so you should be fine. do you have a logger to see whats happening when you do this?

 

[boostedinwyo]

No, the only thing i have to measure a/f mixture is the autometer gauge. I bought the car with a blown turbo and bent valves for 500 bucks and have bought all these parts with the money I made from selling my old car. I just want to be safe and not blow the motor because I dont have the money to rebuild it.

 

[larryd]

without an EGT gauge and/or a pocketlogger their is no sure fire way to know that your car will be running fine. Im asuming you have no sort of fuel control like a S-AFC or is that what the HKS F-con is?

 

[boostedinwyo]

Well the fcon is a fuel computer that plugs in to the factory harness and has a chip that is calibrated to what you have on your car(injectors and pump) and has a dial from 0-10 (0 being stock fuel maps and 10 being more rich) but I have nothing to fine tune in rpm increments so and the highest chip setting that hks offers is a 550 chip with a 240 lph pump and 16g turbo. So im not sure if the setup I have will supply the sufficient amount of fuel im looking for or if I will have to turn the dial all the way up and get some type of fuel tuner to lean out at idle and richen or whatever up top.

 

[larryd]

i understand.. my suggestion would be to sell the Fcon and get something like a S-AFC and invest in a logger like the TMO so you know whats going on, just keep the boost low until you do, dont wanna break anything

 

[boostedinwyo]

Thanks for the suggestions and info, its nice to recieve information from someone that has experience with these vehicles. Its also nice to see a moderator on a dsm site that isnt telling me to use the search button for info most of them are unfamiliar with.

 

[NJGSX96]

I would highly recommend 650s with a 20G. My 550s were at 100% at 45 base fuel pressure on 18psi of boost. If money is an issue, you can keep the boost low, 18psi at the most, the 550s will get you by until you can afford the 650s. If you run a higher octane, 100+, you should be fine also.