stock bottom end, texas speed stage 2 cam, LTH, dual 2.5 exh, cai is stock size diameter, LT4 throttle body, fuel pump and injectors, 10psi.
after 4000 rpm the ecu starts pulling fuel even though maf hz keeps going up. what goes down is cylinder airmass. which just seems impossible, if maf is going up how can that be going down?
so the whole kit goes lean. i change switchover to 400 rpm, or maf asap and it's the same thing. i make vve flat from 4k on and same thing. same on virtual torque. i add more PE and no change. injector open time just keeps going down after 4000. lt4 injectors are huge compared to stock 5.3 so can't be out of injector and fuel pressure moves a bit to the high pressure pump, but rail pressure is always good. plus you can see commanded injector open time is decreasing so it can't be pressure problem. what's going on here???