Yea i think you hit the nail on the head. There's no OEM fix. Outside of throwing a code, i dont see mechanics at the dealer going above and beyond to do any adjustments. In fact, I don't even think they have the authority or permissions to do any ECU adjustments if that's what it takes.Yeah its weird. Try to be nice and smooth and it acts up but put your foot in it and it drives right. Doesnt make sense.
I have heard on here and a couple other places that a Pedal Commander or a Sprint Boost like TitanAndy mentions above has worked wonders. I had one on a 2017 Expedition (think throttle by wire lag and turbo lag combined) and it made a world of difference. I had one on my 2017 Chevy 1500 (it had a off the line lag similar to what some of us are experiencing with our Titans) and it pretty much eliminated it.
Might be worth trying. Id rather spend the $300 on something else but if it improves drivability then its probably worth it.
If the Nissan mechanics are recommending it then you know there is no oem fix.
I will look into a Pedal Commander as I have not really heard of them. I'm sure this is not the first vehicle to have laggy throttle response off the line. I did read, as well, where someone said its the fly-by-wire thats the issue in the throttle but cant find the thread or forum i saw it in. If I figure out a solution I will definitely let you all know. Its really not a game changer for me, just something that I think is fixable from the factory. Sadly, thats not going to happen. May take someone dying in an accident and investigation leading to this issue for Nissan to do a recall and fix this, as terrible as it sounds. I can just see someone trying to pull out quickly and pressing the gas and nothing happening so they goose it to try and get out quick and the truck peeling out, driver loses control....especially in adverse/wet/icy conditions.
I'll look up that Pedal Commander thing though! Good Tip!