Is that car auto or manual? This is an auto. Just installed an lt4 in-tank pump. Low pressure fuel is still mid 40's, but hpfp is good up to 6200 then starts dropping hard. This is on e70. Made 704 at about 8 lbs and 19 deg timing. Seems like it would take more timing, but I wanted to get the fuel issue sorted first. Are you changing any of the fuel pump settings? I am using c7 Z06 settings. Also if I command any more than 25 Mpa for the hpfp it shuts spark off completely. Really seems like once the pulse width gets over 6ms or the hpfp drops below 16 Mpa at higher loads and rpm, the power starts to become effected. Advancing the injection timing out to 360 over 5600 rpm helped a lot with the burn and a cleaner power curve. I tried going 370, but no improvement and it started leaning out. Any other secrets you have?
e85_cam_6400hpfpdrop.hpl