M3cs jerking issue

[karelg719]

Hello guys,
I'm wondering if anyone had this issue. This is 2018 F80 M3CS. See video below. Sometimes I get this very heavy jerking issue. This doesn't happen because of shifting. It happens sporadically and is mostly noticeable in Sport Plus mode. When I down shift from 4 into third or from 3 into second and then get on gas, sometimes I get this. When it happens, I have to get completely off the gas and then get back on. BMW says, this is normal and it's because of traction control. However, the same issue will occur with the traction control turned off completely, so I know they just want to get out of fixing the car. I can also just be in second for example, slow down and then get on gas and it happens. Not all the time but sometimes. The video shows this issue with traction control on but as mentioned it also happens with traction control completely off.

VIDEO: https://www.youtube.com/shorts/lH-bJxvkBL8

[spidy512]

Yo,

Kangarooing. It is a feature of these cars. There is a ton of threads on this, I think in the Engine/Drivetrain sub forum.

What I have learned through research and on this forum...

1. You will need to learn to have a much more sensative gas foot. It is the best way to avoid this.
2. A GTS tranny/diff tune will help. It helped me to reduce the how often this happened.
3. BM3 has a feature that alllows you to reduce torque by gear. I found this to be very helpful.
4. Play with the tranny and engine settings. I find Sport+ to be almost unusable in around town driving. But putting the tranny into S1 helps reduce the hit of the more aggressive engine settings. OR, try the opposite. Comfort plus S3 makes for a more usable car around town personally. But you should try out all the different combos and see what works for you. It is pretty subjective.

I have got used to it, but it still bites me when I get lazy.

Congrats on the CS!

josh

[RugbyBro]

It’s your foot + sport plus throttle that leads to the jerk - especially from a stop because of the car’s clutch engagement. Kind of like a tank slapper if you try to save it it can just lead to more of the same. Just take your foot off the throttle fully, let the car settle momentarily, and reapply throttle smoothly. From a stop, tap the gas first to engage the clutch then smoothly dig into the throttle - you get good at this after a while and it all becomes one smooth motion.

[Nyc911]

Originally Posted by RugbyBro

It’s your foot + sport plus throttle that leads to the jerk - especially from a stop because of the car’s clutch engagement. Kind of like a tank slapper if you try to save it it can just lead to more of the same. Just take your foot off the throttle fully, let the car settle momentarily, and reapply throttle smoothly. From a stop, tap the gas first to engage the clutch then smoothly dig into the throttle - you get good at this after a while and it all becomes one smooth motion.

It’s this… the M3 CS has the most sensitive throttle I’ve ever driven. Just easing up a fraction of a mm causing bucking.

I have a CS as well and I just added a BM3 stage 1 just so I can get rid of burbles and adjust the torque in 1st and 2nd gear it made the car much more fun to drive.
I also noticed you were in manual DCT mode it’s more pronounced when you hard launch in manual from my experience.

[TractionControlDelete]

The car likes commitment - if you blasted the throttle it wouldn't buck at all lol. Just stay out of Sport+ for normal driving around town.

As others have said, if you want to accelerate slowly then do it with smooth and consistent pedal application.

If you want to go fast… well just give it the beans. The car never objects to that.

[slowturbo]

As others have said, avoid sport + for regular driving and get a gts tune. My DCT felt way better after Kubax86 hooked me up witht he GTS programming.

[dezzracer]

Why are you guys driving around town in S3 shift and S plus engine anyway? That's not what those settings were designed for. They are there in a CS because they were set by a BMW M engineer and a pro factory driver for a race track and operating almost the entire time at high revs right to the limit. There will be no low rev jerking in that scenario. Just a very fast four door sedan.

[NYG]

Sounds like every single DCT on earth.

[JLS_397K]

So this isn’t anything new as everyone has mentioned. It comes down to your own body weight sloshing back and forth and pivoting on the heal of your foot… The tip of you toes may only swing less than a 1cm, but that probably equates to a fluctuation of 20% - 30% throttle at high boost Sport Plus mode.

This can occur in my E60 M5 with SMG in P500S mode. (P400/P500/P500S) as well… Ill try to draw out a picture, but to me, this is how i have always consider the throttle input correlated to engine performance between the different drive modes. This is a VERY rough graph. Blue is Comfort (Lower boost, slow input) , Red is Sport(Better boost, 1 for 1 output), and Black is Sport Plus (highest possible boost, exaggerated input) setting. Basically, just follow the x axis for throttle input, then move up to see engine response basically to give an idea. Hope this helps give an idea why there is so much jerking.

[M4theWIN1]

We have all dealt with this. I'll never forget the first time it happened to me. Had my wife & daughter in the car and they laughed for a good 5 minutes. Certainly a low point in driving the M 😆. It's all about throttle response and how you engage the pedal. All other comments in this thread are correct. It will be a thing of the past once you figure it out. I'm in sport + / setting 3 / using paddles 24/7.

[dezzracer]

Again…I don't dispute any of the recommendations to "drive around" the jerking issue. But why..unless your driving around on public streets like a maniac with it floored all the time. The car is powerful enough and shifts fast enough in sport to have plenty of fun without going thru all the motions stated here to avoid the jerking issue. Sport plus setting are for a RACE TRACK at the LIMIT. Period end of story.

[khanmohammed]

Originally Posted by Nyc911

It’s this… the M3 CS has the most sensitive throttle I’ve ever driven. Just easing up a fraction of a mm causing bucking.

I have a CS as well and I just added a BM3 stage 1 just so I can get rid of burbles and adjust the torque in 1st and 2nd gear it made the car much more fun to drive.
I also noticed you were in manual DCT mode it’s more pronounced when you hard launch in manual from my experience.

Is it worth doing the BM3 Stage 1 on a CS when it comes with a CS tune from the factory?

[M4theWIN1]

Originally Posted by dezzracer

Again…I don't dispute any of the recommendations to "drive around" the jerking issue. But why..unless your driving around on public streets like a maniac with it floored all the time. The car is powerful enough and shifts fast enough in sport to have plenty of fun without going thru all the motions stated here to avoid the jerking issue. Sport plus setting are for a RACE TRACK at the LIMIT. Period end of story.

It's all about the feel of the car for me to be in Sport + for all modes (throttle, suspension, steering) track or in city driving. It makes the input of all settings feel very precise and not feeling as if I'm behind the wheel of my daily.

[QuickRick]

Guys,

Interesting thread about a subject I was to ask about elsewhere!

I was at an autocross yesterday and got this bucking while blasting out of the timing gate. It is kind of a drag so I just short shift to second as a fix.

If I understand correctly it is my doing as the M button setting to Sport Plus everything? Honestly I need this power to get going quickly and need it sorted.

My car is a 6 speed manual not DCT.
QuickRick
p.s. if it means I should leave the gate smoking both tires so be it!

[bsmf8x]

It's not the traction control.

This is an issue of throttle modulation.

Modern cars spoil the average driver and allow them to be rough on the gas and get away with it, even if it's not what's best for the car or driving experience.

If you've ever driven a manual extensively, especially different manual cars with turbos and high power levels, you will never experience this issue with an f80 dct because you know how to modulate the throttle.

Learn to get on and off the gas smoothly, and don't half commit to gassing it etc and this issue will be non existent. I drove my m4 for 40k miles and this only happened 2x, the month I got my car.

[csboi]

Originally Posted by QuickRick

Guys,

Interesting thread about a subject I was to ask about elsewhere!

I was at an autocross yesterday and got this bucking while blasting out of the timing gate. It is kind of a drag so I just short shift to second as a fix.

Did you use launch control?

[csboi]

Originally Posted by bsmf8x

This is an issue of throttle modulation.

If you've ever driven a manual extensively, especially different manual cars with turbos and high power levels, you will never experience this issue with an f80 dct because you know how to modulate the throttle.

100%. Throttle is of course advertised by BMW as more responsive by design and knowing this, I wasn't at all surprised the first time this happened to me. It occured just a couple times while I was learning to drive the car, in it's various modes. ��

[QuickRick]

What's up with all the "around town" comments? Here's the deal, if I'm hammering the throttle off the start in autocross and it bucks like a bronco........what good is the car?

The shift from 1 to 2nd is almost unusable and I am looking too for this work around,To me it shows that parts of this car are unbaked. If I need to place it in Sport rather than Sport plus I'll do it.

I love the car otherwise but I expect a lot and this is disappointing.

QR

[65fastback]

Originally Posted by QuickRick

What's up with all the "around town" comments? Here's the deal, if I'm hammering the throttle off the start in autocross and it bucks like a bronco........what good is the car?

The shift from 1 to 2nd is almost unusable and I am looking too for this work around,To me it shows that parts of this car are unbaked. If I need to place it in Sport rather than Sport plus I'll do it.

I love the car otherwise but I expect a lot and this is disappointing.

QR

Hum?... F8X's aren't for everyone, if its not working out for you maybe try something else.

Driver mod is always a consideration too. try a N/a car like a C7 corvette or sum thing like that.

[RugbyBro]

Originally Posted by QuickRick

What's up with all the "around town" comments? Here's the deal, if I'm hammering the throttle off the start in autocross and it bucks like a bronco........what good is the car?

The shift from 1 to 2nd is almost unusable and I am looking too for this work around,To me it shows that parts of this car are unbaked. If I need to place it in Sport rather than Sport plus I'll do it.

I love the car otherwise but I expect a lot and this is disappointing.

QR

My general answer would be just not to use sport plus - it is notoriously unforgiving when combined with S55 power delivery. Personally, I never use it and track my car in both efficient and sport throttle modes depending on the response I want on the day/session.

Quick question: did you run with DSC on? If you were then that could contribute to this issue coming out of first gear.

[csboi]

Originally Posted by QuickRick

Here's the deal, if I'm hammering the throttle off the start in autocross and it bucks like a bronco........what good is the car?

Do you use launch control when launching at autocross, or no? This is very important information.

[QuickRick]

Hi,

For my sessions I'm using Sport plus everything and MDM. I was under the impression that it was less intrusive.......I must be mistaken however.

I'd appreciate your feedback!

Thanks
QR