On my XFI I just went from a 3 bar to a 3.5 bar using AEM's sensor. The sensor was calibrated in the system configuration. I used a 4 in the fuel calculation parameters for Map sensor. I now notice when I'm spooling up the turbo on the brake I'm lean from idle up to my 4500 leave rpm. I changed nothing in my VE tables or any other areas. I had a target A/F of 12.8 and now its showing 15.5 adding 8% fuel which is what I limit on pos corection in that area of the map.
I would have to make significant increases on the VE table in this area to get back to 12.8:1 a/f. I dont want to chance taking the car up any higher in rpm or make a pass till this is corrected. Something isnt right. My buddy has had the same thing happen to him as well with the 3.5 bar map. When he went back to the 3 bar and correct .gct file it no longer was lean. I did test if the map sensor was reading correct for Kpa/psi with my Mighty Vac and the psi in the ECM, Boost gauge and Mighty Vac test gauge were all within .5 psi of one another. Any ideas on what would cause this when going to the 3.5 bar map?? Fuel pressure was also verified to be correct. Thanks.
I would have to make significant increases on the VE table in this area to get back to 12.8:1 a/f. I dont want to chance taking the car up any higher in rpm or make a pass till this is corrected. Something isnt right. My buddy has had the same thing happen to him as well with the 3.5 bar map. When he went back to the 3 bar and correct .gct file it no longer was lean. I did test if the map sensor was reading correct for Kpa/psi with my Mighty Vac and the psi in the ECM, Boost gauge and Mighty Vac test gauge were all within .5 psi of one another. Any ideas on what would cause this when going to the 3.5 bar map?? Fuel pressure was also verified to be correct. Thanks.
