Hey all. I just got around to installing my AEM EMS and want some help with using larger injectors. PTE 880cc's. Now, I already did the battery latency adjustments, but i am wondering about the wizard thing that lets you change inj sizes. Stock ones are 43psi 560cc, right? So, now what if I not only switched in 880cc's, but also have a Walbro 255? Does this change the pressure from 43psi to something else? And, if so, to what?

 

i have pte 880's in my car. your more than welcomed to have my cal file to get you started.

please list ALL your engine mods.

 

Your fuel rail's pressure won't change with new 880cc injectors. But, with larger injectors, your ems is currently tuned to your 560cc injectors and the volumetric efficiency that those produce. With larger injectors your pulse timing will need to be adjusted. I'm not sure how the wizard will help. I have the aem ems but, haven't dug too deep, yet =) I believe that we have a fuel pressure regulator that keeps the fueling system at constant psi and it may have an adjustment screw but, you wont need anything more than a walbro and it will keep the fuel flowing at a high enough rate for 880cc. I have 1020cc and my walbro 255 works great.

 

I do have the Walbro 255