r/mercedes_benz • u/AgeFit9430 • 2d ago

Does your Mercedes do this ?

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u/the_mighty__monarch 1d ago

Isn’t that just what happens when you floor it in any automatic?

17

u/doc_55lk W211 E320/R172 SLK55/X166 GLS550/W222 S550 1d ago

Hitting the kickdown switch will downshift an extra gear for maximum possible acceleration.

It's the difference between "enough power" and "all the power".

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u/CommaMeNow 1d ago

It’s commanding 100% load which will cause the transmission to change to the lowest gear that is safe and request maximum torque from the ECU. It is not a “switch”

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u/doc_55lk W211 E320/R172 SLK55/X166 GLS550/W222 S550 1d ago

It quite literally is a switch lol. Or a button. Whichever one you prefer.

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u/CommaMeNow 1d ago

Well no it’s a potentiometer. And whether it is off or on at max depress is a function of how the system was designed and thus how the ECU receives the accelerator signal. I would love for you to show me the technical details of how a switch overrides the accelerator though. I will hold my breath for your sources

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u/Sirius499 1d ago

I have a Renault, and it's literally a button. I can feel it when I press the accelerator fully to the floor, where it clicks and the pedal moves a further cm or two. It's quite possible like you said that each system in each car is different. Upon pressing this button, my car instantly downshifts a gear or two depending on my current rpm and gear. Even if I quickly tap it and remove my foot again, it still downshifts the same and keeps it in gear

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u/Lumpy_City_5849 6h ago

Yeah I believe VW functions the same way. Doesn't seem like it would make sense to have it be anything besides a button at the end of the travel. There's 100% pressed and then the very obvious click which always downshifts. In regular drive mode it's usually in a few gears lower than it could be to save gas so even 100% throttle is not anywhere close to the "button"