What Size Injectors for Boost Reference Fuel System

Originally Posted by bullitt5897

In a 1 to 1 fuel system yes. I have a 1 to 1 ratio system in my car.

What we found out was that my 1150cc injectors were too small and even with the A1000 on 12V I was not able to stretch the injectors.

We started running a Base Pressure of 40PSI and since we were running 25psi of boost our total fuel pressure was 65psi. At this total pressure my fuel pump was only able to flow ~690lbs/hr which is less than a twin pump design.... at this point we knew the injectors were out of juice. so in order to stretch them we bumped up our base pressure only to get a less than stable top end with the injectors going static and the fuel pump flowing even less.

Fuel pumps flow better at lower pressures the ideal pressure for my fuel pump is 30psi. when we add boost its not enough... so we will be upgrading the fuel pump and injectors.

Fueling for any engine is a balance between injector size and fuel pump pressure.