swrdply400mrelay

I have a D16y8 with the Greddy Kit. For fuel I just have a Cartech FMU and a Walbro 255lph Hi Pressure Fuel pump. The problem is, whenever I get on it and shift into 4th, I immediately throw a CEL. I checked the code, and it comes out as a defective/short primary oxygen sensor. I have less than 20k miles on my car, and whenever I reset the ECU, the CEL never comes back until I get on my car all the way until 4th gear. I think it's because I run too rich because the fuel pump puts out too much fuel pressure. I was thinking of changing the fuel pump to a 255lph with 310cc injectors and a vafc. This way the fuel pump won't put out too high of a pressure. But this scares me since I don't know if the non hi pressure pump will be able to handle 14psi, which is what I eventually would like to run.

I was thinking of getting a 190lph pump with 440cc injectors and run the AFC hack, but I heard the stock map sensor was only good until 11psi. I'm eventually going to get pistons and rods and run 14psi. Would a 3 bar map sensor similar to the ones Hondata sell be good for the AFC hack? Other than a standalone or Hondata, what fuel setup are you guys running on your turbo cars or would you recomend?

swrdply400mrelay

do you know what the stock fuel pressure is exactly? i just know it's in a range of 35-42psi at idle

this did come with a piggy back, but i used a missing linke with an fmu and fuel pump instead

also do you know the part number of the map sensor?

thanks for your help