I wish we could just get instantaneous linear throttle response:
press pedal 12.5%, get 12.5% throttle instantly
press pedal 25%, get 25% throttle instantly
press pedal 50%, get 50% throttle instantly
and so on and so forth
Unfortunately, I don't think we will ever get that with the fly-by-wire system. There will always be some lag in the system because the throttle body takes some time to respond to the input.
The tunes and this device try to compensate for it by making it more "responsive"
press pedal 12.5%, get 25% throttle after a short lag
press pedal 25%, get 50% throttle after a short lag
and so forth
I am not sure that is really an improvement