I just bought an ATI procharger kit D1sc and am getting rid of my powerdyne system. My powerdyne system has a FMU on it, but the ATI did not come with one. I am upgradeing to 42lb injectors and a 255lph fuel pump. Do I need the FMU with my new setup or will the new injectors and pump keep up?

 

You wont need the FMU

 

The only problem is that there is no reference between fuel pressure and boost unless you go to a 2 bar MAP sensor. The PCM is just guessing once you hit boost. If you don't run a FMU you definately need a fuel pressure gauge and maybe a wideband to make sure you don't go lean.

Dave