Whats the best fuel ratio i should be going with since i only want to run under 8psi? 12:1, 10:1, 8:1?

12:1

So a little more research before posting next time.

well i figure since i cant make a new one ill just use this old post. i was wondering the same thing as the original poster, what fmu should i get if im going to be running 8 psi max and probly 4 normaly. i will have 550's and a 255 pump. i was also wondering what exactly the ratios meant oon the fmu's...from what ive read i think its a 12:1 will raise the pressure 12 psi for every pound of boost?? i have searched around already but i didnt see anyone with the same question that had 550's and a 255 on a n/t 420a that has been turbod

any help is appreciated

Yes, it raises fuel pressure 12psi for every 1psi of boost. You don't need 550's with an FMU... just the stockers.