Bucking while accelerating - DCT?

Super Spartan · 09-24-2017, 06:48 AM

Quote:

Originally Posted by stormlv

It happened to me as well and I've learned to avoid it.
For me it happens in Sport+ throttle mode and 1st gear.
Given how responsive this car is in that mode, I'd say it's normal to need to take care.

People shouldn't take it personal when others say it's user error.
I'm probably making a lot of mistakes when it comes to this car... My goal is to learn to recognize them and try to correct them.

same here, I've learned how to modulate the throttle to not have this happen anymore even in 1st gear and Sports +

///M-er-gized · 09-24-2017, 08:14 AM

I just don't use S3/D3 anymore when in Sport Plus mode. Problem solved.

marvinp · 09-24-2017, 10:39 AM

I had the same thing happen as well in S+ and D3 but figured it was my error. I switched my M2 settings to S+ and D2 and it hasn't happened anymore. D3 is just too touchy from a full stop.

Super Spartan · 09-24-2017, 10:48 AM

Quote:

Originally Posted by marvinp

I had the same thing happen as well in S+ and D3 but figured it was my error. I switched my M2 settings to S+ and D2 and it hasn't happened anymore. D3 is just too touchy from a full stop.

Even in S3 you will learn that there is a way to not get that jerk, don't press on the accelerator lightly but give it some initial force then switch to a gradual press and it won't jerk

Vectors2final · 09-24-2017, 11:21 AM

From a stop if you use slight throttle input, you hear the engine rev a few hundred RPMs. That'll help give you an idea of where your sweet spot is in regards to the throttle input that causes the "bucking".

Race_Doc11 · 09-24-2017, 05:59 PM

Quote:

Originally Posted by X2Board

My E90 did the same thing. Sometimes so badly, it made me look like a novice stick driver with a touchy clutch.

+1

spmd11 · 09-25-2017, 12:34 AM

Quote:

Originally Posted by MWS55

When I have M Engine Dynamics set to Sport Plus and Drivelogic set to S3, the car bucks under heavy acceleration. Anyone else?

Foot off the throttle.. ease her back in.. lol

Peter10654 · 12-16-2017, 06:09 PM

Please help me out. When you play on S3 with the throttle the on/off game in a lower gear, do hab’s a pretty hard noise/Hit from the power train? It feels like a worn out driveshaft joint or worn out gears with to mc G Space between acceleration and rolling.

Thanks

Peter

GrussGott · 12-16-2017, 07:42 PM

Quote:

Originally Posted by Peter10654

When you play on S3 with the throttle the on/off game in a lower gear ... a pretty hard noise/Hit from the power train ...

That's the ///M badassery being baller. The fix is to put your throttle foot to the floor and hold it there until you see flashy lights in your rearview mirror. Then apply brakes and pull safely to the side of the road.

The attendant who arrives will chauffeur you to overnight accomodations, but warning: checkout will be kind of expensive.

But no worries because you'll still be smiling from the night before.

Peter10654 · 12-19-2017, 12:54 PM

Quote:

Originally Posted by GrussGott

That's the ///M badassery being baller. The fix is to put your throttle foot to the floor and hold it there until you see flashy lights in your rearview mirror. Then apply brakes and pull safely to the side of the road.

The attendant who arrives will chauffeur you to overnight accomodations, but warning: checkout will be kind of expensive.

But no worries because you'll still be smiling from the night before.

Hahahaha

Ok buddy.... make sense. If I can read between the lines you’d tell me that’s normal M and I don’t have to worry about it?

Thanks

Peter

EstrlM3 · 12-19-2017, 01:48 PM

Is there a YouTube link or a video on this? I have tried looking and have not been able to find a video of what is taking place.

MN2///M · 12-21-2017, 08:32 AM

I can't believe this thread has 13 pages.

GrussGott · 12-22-2017, 02:33 AM

Quote:

Originally Posted by MN2///M

I can't believe this thread has 13 pages.

The when-my-car-is-neutral-on-a-hill-it-rolls-whats-the-fix thread is 28 pages.

GrussGott · 12-25-2017, 08:07 PM

Quote:

Originally Posted by GrussGott

The when-my-car-is-neutral-on-a-hill-it-rolls-whats-the-fix thread is 28 pages.

BTW - good thing we don't have 911s or it'd be 208 pages long

... Nick

SD ///M4 · 12-29-2017, 07:18 PM

Quote:

Originally Posted by MN2///M

I can't believe this thread has 13 pages.

I can't believe that the advice to remedy this behavior is the same on the 13th page as that was on the first page more than three years ago...

GrussGott · 12-29-2017, 08:04 PM

Quote:

Originally Posted by SD ///M4

I can't believe that the advice to remedy this behavior is the same on the 13th page as that was on the first page more than three years ago...

Mastery requires repetition.

2018F80 · 02-16-2018, 07:15 PM

This may have been said already but this is not just a DCT thing. It happens in the 6MT also. If the transmission is the held in the same gear and you suddenly jab the throttle (in Sport + especially) and release the gas peddle prematurely, it will jerk (and sounds a little odd also). I believe this to do with the way the turbo's turn off just as quickly as they turn on. You have to modulate the throttle as others have mentioned. You get used to it.

silverstar335 · 02-16-2018, 07:42 PM

Get the latest firmware, problem solved

.

2018F80 · 02-16-2018, 08:09 PM

Quote:

Originally Posted by silverstar335

Get the latest firmware, problem solved

.

How recently did you do this? My car is a 2018 (Sept 2017 production I believe). It still exhibits the noted concern on this thread.

Ghosn · 02-16-2018, 08:31 PM

Quote:

Originally Posted by 2018F80

How recently did you do this? My car is a 2018 (Sept 2018 production I believe). It still exhibits the noted concern on this thread.

You must be from the future?

BlatantMaple854 · 02-16-2018, 08:38 PM

Quote:

Originally Posted by silverstar335

Get the latest firmware, problem solved

.

This is terrible advice! My MY 2017 was just updated to the latest November software without my consent and my DCT is totally messed up where it was perfect before. I have increased bucking, jarring noises from the trans and diff, and a huge buck on the smoothest d1 setting in first gear. If you have a 2017 or earlier car DO NOT update to the “newest” software!

2018F80 · 02-16-2018, 10:46 PM

Quote:

Originally Posted by Ghosn

You must be from the future?

Haha, good catch. Typo. I meant 2017.

09-24-2017, 08:14 AM	#266
///M-er-gized Captain 687 Rep 663 Posts Drives: 2019 540i Join Date: Mar 2015 Location: Florida iTrader: (0)	I just don't use S3/D3 anymore when in Sport Plus mode. Problem solved. __________________ 2019 540i \| Black Sapphire \| Black Dakota Leather with Blue Stitching \| M Sport Package \| Executive Tier \| Driver Assistance \| Parking Assistance \| HK \| M Sport Brakes \| Leather Dashboard 2016 M3 \| YMB \| Black Extended Merino \| CF Roof \| CF Trim \| DCT \| Adaptive \| Executive
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09-24-2017, 10:39 AM	#267
marvinp Captain 274 Rep 612 Posts Drives: '18 M3, '09 135i Join Date: Jun 2009 Location: San Francisco Bay Area, CA iTrader: (0)	I had the same thing happen as well in S+ and D3 but figured it was my error. I switched my M2 settings to S+ and D2 and it hasn't happened anymore. D3 is just too touchy from a full stop.
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09-24-2017, 11:21 AM	#269
Vectors2final Brigadier General 1342 Rep 3,340 Posts Drives: 2018 F80 YMB/SS ZCP Join Date: May 2011 Location: Austin, Tx iTrader: (0)	From a stop if you use slight throttle input, you hear the engine rev a few hundred RPMs. That'll help give you an idea of where your sweet spot is in regards to the throttle input that causes the "bucking". __________________ 2019 Ruby GT350 - Gen 5 Whipple on corn making 855RWHP. Sold: 2018 F80 Part Deux /DCT /YMB /Full SS /CF Trim /ZCP /ZEC w/Black 666M Sold: 2015 F80 /DCT /YMB /Full SS /CF Trim /ZEC /ZLP /HK /S&TVC- 18''///M Last edited by Vectors2final; 09-24-2017 at 09:42 PM.. Reason: derp
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12-16-2017, 06:09 PM	#272
Peter10654 New Member 6 Rep 14 Posts Drives: M3 F80 Competition Frozen Silv Join Date: Aug 2009 Location: Germany iTrader: (0)	Please help me out. When you play on S3 with the throttle the on/off game in a lower gear, do hab’s a pretty hard noise/Hit from the power train? It feels like a worn out driveshaft joint or worn out gears with to mc G Space between acceleration and rolling. Thanks Peter
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12-19-2017, 01:48 PM	#275
EstrlM3 Second Lieutenant 66 Rep 276 Posts Drives: BSM 335i Sedan Join Date: Aug 2010 Location: So Cal iTrader: (0)	Is there a YouTube link or a video on this? I have tried looking and have not been able to find a video of what is taking place.
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12-21-2017, 08:32 AM	#276
MN2///M Captain 521 Rep 865 Posts Drives: very fast! Join Date: Jan 2016 Location: Colorado Springs iTrader: (0)	I can't believe this thread has 13 pages. __________________ 2003 BMW 330i 2016 BMW M4 - ED May 2016, PCD Aug 2016 2017 X5 xDrive35i - PCD Jan2017
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02-16-2018, 07:15 PM	#281
2018F80 Enlisted Member 22 Rep 45 Posts Drives: 2018 M3 Join Date: Dec 2017 Location: Seattle, WA iTrader: (1)	This may have been said already but this is not just a DCT thing. It happens in the 6MT also. If the transmission is the held in the same gear and you suddenly jab the throttle (in Sport + especially) and release the gas peddle prematurely, it will jerk (and sounds a little odd also). I believe this to do with the way the turbo's turn off just as quickly as they turn on. You have to modulate the throttle as others have mentioned. You get used to it.
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02-16-2018, 07:42 PM	#282
silverstar335 Major 502 Rep 1,340 Posts Drives: G05 Join Date: Jan 2013 Location: NC iTrader: (4)	Get the latest firmware, problem solved .
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