I've run into a problem while getting the car tuned and we're currently really confused and out of ideas..
The car is a r32 gtr with 2860 -5's, id1000 injectors, z32 afms, aeromotive 350lph fuel pump, power fc ect
The problem started when I swapped to e85 and had sard 700cc injectors and 044 pump, we had the injectors at 90-100% duty and it was still stupidly lean on boost so we thought they must be some how running out (should of been enough fuel for 350kw).. so I swapped to id1000's. After that the car still did the same thing, it was fine on vac but as soon as its on boost it goes real lean, no matter how much fuel we throw in (we had the 1000's at 90% duty and it made no difference).
So then we thought fuel pump,, checked the flow and it holds 40psi to start off with, goes up to 60psi then drops off back to 40psi around the 4k rpm mark.. so I changed the 044 to the aeromotive 350lph pump. It didn't make a any difference at all, even with a fuel reg and upping the pressure..
We have also checked voltage drop at the fuel pump and that's fine, timing is spot on and isnt a tooth out or anything like that.
The problem is boost dependent and does the same thing no matter how much or less boost, my afr looks like a nike tick..