Jerky Stop
Thread Starter
Member
Joined: Mar 2018
Posts: 165
Likes: 15
From: Temecula, CA
Current: 2017 C63S Prior: 2016 CLA45, 2015 Evo X Final Edition
Jerky Stop
Could be a complete noob question, but in Sport Mode when coming to a complete stop, my car lurches forward a little bit from time to time. It doesn't always happen, which is why it bothers me. It only happens in Sport and Sport +. Is this normal? What is the purpose?
Last edited by Drisso88; Sep 28, 2020 at 12:55 PM.
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MY17 C63s Sedan
MBWorld Fanatic!
Joined: Dec 2012
Posts: 1,537
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From: Austin, TX
2017 Porsche 911 C4
Are you sure you're not feeling the car downshift from 2nd to 1st? In comfort mode, the gearbox starts in second gear so when coming to a full stop it will not downshift into 1st like it does in Sport/Sport+/Race mode. It could also be how the transmission/TCU adapted to your driving style that causes an abrupt downshift to 1st, I believe you can reset the adaptations if that's the case.
Junior Member
Joined: Aug 2020
Posts: 46
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From: Dallas, TX
'18 AMG C63S coupe
Yeah I believe it's just the aggressive downshifting in those modes to keep the rpm high. It sort of works like engine breaking, that's the reason you felt jerky.
To avoid this as much as possible, try gently lift the throttle to have car slow down, instead of lift it completely at once. IMO jerky is just that throttle response when you don't want it.
To avoid this as much as possible, try gently lift the throttle to have car slow down, instead of lift it completely at once. IMO jerky is just that throttle response when you don't want it.
Thread Starter
Member
Joined: Mar 2018
Posts: 165
Likes: 15
From: Temecula, CA
Current: 2017 C63S Prior: 2016 CLA45, 2015 Evo X Final Edition
Are you sure you're not feeling the car downshift from 2nd to 1st? In comfort mode, the gearbox starts in second gear so when coming to a full stop it will not downshift into 1st like it does in Sport/Sport+/Race mode. It could also be how the transmission/TCU adapted to your driving style that causes an abrupt downshift to 1st, I believe you can reset the adaptations if that's the case.
MBWorld Fanatic!
Joined: Dec 2012
Posts: 1,537
Likes: 372
From: Austin, TX
2017 Porsche 911 C4
That seems a little unusual, do you have the pre-facelift or facelift? With the PFL 7-speed I haven’t had any issues like that when coming to a stop in 1st gear. You may want to bring it to the dealer so they can check your ECU/TCU software for updates assuming you’re under warranty.
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Thread Starter
Member
Joined: Mar 2018
Posts: 165
Likes: 15
From: Temecula, CA
Current: 2017 C63S Prior: 2016 CLA45, 2015 Evo X Final Edition
That seems a little unusual, do you have the pre-facelift or facelift? With the PFL 7-speed I haven’t had any issues like that when coming to a stop in 1st gear. You may want to bring it to the dealer so they can check your ECU/TCU software for updates assuming you’re under warranty.
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Member
Joined: Jul 2020
Posts: 107
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From: Seattle, WA
C63
I have a tight spot parking my car in my garage. I've learned to feather the brake and account for a slight lurch right before I come to a complete stop. It's like as if the car downshifts and catches a gear right before it stops, but I'm in first gear.
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⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
