Hello, I replaced the original evo 7 fuel pump with a Walbro 340lph;
Do I need to rescale the injectors or anything else because i assume the fuel pressure will be higher now ?;
Anyway, that's what I remarked when upgrading fuel pump on other cars... So i had to alter the ecu parameters like injector size to return to the desired values...
Usually, I do : New injector size= Old size * Radsquare(New pressure/old pressure)

 

I wanted to do that but does it make a difference?

 

No unless you tune it to make a difference otherwise it'll run as a stock pump