not too sure, but i drove it today in the same settings and basically it does the same thing on the road with the turbo gauge up on the screen...
its def turbo lag, so ill shoot a video and get it posted..
try it yourself... drive along, pretty much any speed, 30-60mph, coast and punch the gas to the floor, there is a noticeable delay before anything happens. not ideal in some driving situations. perhaps drive by wire is partially to blame and i should try putting the stock tune back in and see if that affects anything, but i doubt it will.
it is not making turbo boost off throttle (anti-lag, baja mode) and while backfiring thru the exhaust may keep the turbo rpm up, these units do not make instant boost.
while i probably come off as an ecoboost hater, i love a lot of things about this truck.. its pretty fun, i think i have the best sounding exhaust setup after spending thousands.. and i am planning on keeping this truck long term, but i dont have great faith in the reliability of this engine in the long run..