Out of curiosity I was fiddling with the accelerator pedal the other day just to find out if I can get a sense of the input resolution. Trying to see how little an input can be registered and how accurately i can maintain a given rpm, I stumbled upon this phenomenon where the idle reduces to around 500rpm almost to the point of stall. I tried if i can stall it in this manner but it doesn't go below 500 much.
With the right input, you can reduce the idle rpm to below the usual on any drive mode with the accelerator pedal.
Below is a video of how it looks like on the tachometer.
It can be replicated by simply accelerating to around 1.5k rpm in neutral with the car stationary (rolling tends to raise idle rpm and its plain dangerous to focus on the gauges this much when rolling =)) and very gently easing off unit the rpm drops to around idle and hold a steady %1 (or below but not %0) accelerator input as displayed in n-mode screen. Then you can see the rpm sag below the usual idle. You can maintain this state seemingly as long as you want if you have an exceptionally steady foot.
If you hit %0 in n-mode screen, it won't work because as soon as you hit 0 it goes back to usual idle.
I know very little about ECU maps and how accelerator input is actually interpreted in the ECU but i would love to know what could be causing this and if this can be considered a bug.
Ps. I have tried this on several vag cars also (namely audi, skoda and vw), both diesel and gasoline and non of them displayed such behavior no matter how i tried.
With the right input, you can reduce the idle rpm to below the usual on any drive mode with the accelerator pedal.
Below is a video of how it looks like on the tachometer.
It can be replicated by simply accelerating to around 1.5k rpm in neutral with the car stationary (rolling tends to raise idle rpm and its plain dangerous to focus on the gauges this much when rolling =)) and very gently easing off unit the rpm drops to around idle and hold a steady %1 (or below but not %0) accelerator input as displayed in n-mode screen. Then you can see the rpm sag below the usual idle. You can maintain this state seemingly as long as you want if you have an exceptionally steady foot.
If you hit %0 in n-mode screen, it won't work because as soon as you hit 0 it goes back to usual idle.
I know very little about ECU maps and how accelerator input is actually interpreted in the ECU but i would love to know what could be causing this and if this can be considered a bug.
Ps. I have tried this on several vag cars also (namely audi, skoda and vw), both diesel and gasoline and non of them displayed such behavior no matter how i tried.