I have a 93 wrx with scooby ecu , at the moment it has 380cc injectors if i upgrade to 440 or 550 cc injectors do i have to up grade the fuel pump and reg or will the standard work with the larger injectors , i know i will have to get the scooby ecu injector duty cycle altered just wondered about the stock fuel pump ?

thanks


Mark

 

If you upgrade the injectors it may run lean because of lack of delivery from the pump.
Do your mods then remap to suit.