[JeffHou73]

I have about 500 miles on my new 2020 M340i. It's wonderful - possibly the most fun car I've ever owned. However, when driving "casually" (not sporting it around with fast accelerating), my car seems to shift very quickly from 1st thru 4th of 5th gear when driving in Comfort Mode. It creates what somewhat feels like the old days when your car would "miss" or skip (or surge back and forth). I don't recall this occurring the first 300 or so miles, but then again, those frist two weeks I was driving fairly aggressively having too much fun. Now, I'm settled back to my more normal conservative driving habits until someone new is in the car that I need to impress! Anyone else have similar experience at slow acceleration and slow speeds under, say, 20-30mph. Once above this speed all is smooth. I guess the car is built to mainly go fast - which does impressively - than too slowly?

[RPM1123]

Shifts shouldn't be perceptible in comfort mode when applying light (I'd say up to a third) throttle. When I have music on and I'm accelerating lightly in comfort mode I can't even perceive the shifts unless I'm looking at the tachometer.

[DonTheDon]

Is it only when you first start your car? Mine does this after just starting it, then after about a minute of being on it stops and guess back to normal. Figure is a safety feature for temperature or fluids or something.

[JeffHou73]

Originally Posted by RPM1123

Shifts shouldn't be perceptible in comfort mode when applying light (I'd say up to a third) throttle. When I have music on and I'm accelerating lightly in comfort mode I can't even perceive the shifts unless I'm looking at the tachometer.

Thanks...I would have expected what you are saying. I'm going to give it a few hundred miles and see if it settles out. I may have "learned" I'm an aggressive driver and now needs to learn that was temporary. My work around right now is to switch directly into Sport mode now on the neighborhood streets where you only go about 25-35 mph... this not only eliminates the symptom I'm having but takes it turns off the on/off start engine button... I'm pushing one of the two buttons regardless...so will go with Sport, for now. Once I'm on to over 25mph streets, will switch back to Comfort most of the time. I'm hoping this isn't a long term procedure but not horrible if it is.

[JeffHou73]

Originally Posted by DonTheDon

Is it only when you first start your car? Mine does this after just starting it, then after about a minute of being on it stops and guess back to normal. Figure is a safety feature for temperature or fluids or something.

Mine seems only be perceptible for the couple of minutes I'm in the neighborhood. Once out of the neighborhood, I'm accelerating enough in Comfort mode to eliminate the symptom. It's the very light accelerating where it seems to go from 1st thru about 4th or 5th gear very quickly getting to just 25mph. I'm surprised it even goes to this high a gear at this speed, but the rpm's allow it for the best mileage I guess. Seems 3rd or 4th would have been the max gearing, but they didn't ask me. Btw - I did drive it with the foreman today and, of course, we could not feel any surging/skipping on the 15 minute test drive no matter how hard I tried to duplicate it for him... Typical - right? I'm not losing sleep over this. The fun far outweighs any of this minor nuisance.

[Weiner0123]

Bro. Owners manual!! How hard were you driving?? You gotta break the vehicle in lightly, might have been hard on the tranny while it was not yet set in, ??

[JeffHou73]

Originally Posted by Weiner0123

Bro. Owners manual!! How hard were you driving?? You gotta break the vehicle in lightly, might have been hard on the tranny while it was not yet set in, ??

Thanks! I'm aware of the break-in recommendations but your point and response is well taken!!

I'll never use "launch control" I've read will reduce a car's life even on a well broken in.

As far as revs and rpms, I've not come close to 100 mph though rpm's probably have exceeded the recommendation - but that was likely even on the test drive...that's even worse!

My use of aggressive I don't believe is anything close to real enthusiasts - though, in retrospect, I probably should have been a little more respectful.

Thanks for your post.

[Weiner0123]

Originally Posted by JeffHou73

Thanks! I'm aware of the break-in recommendations but your point and response is well taken!!

I'll never use "launch control" I've read will reduce a car's life even on a well broken in.

As far as revs and rpms, I've not come close to 100 mph though rpm's probably have exceeded the recommendation - but that was likely even on the test drive...that's even worse!

My use of aggressive I don't believe is anything close to real enthusiasts - though, in retrospect, I probably should have been a little more respectful.

Thanks for your post.

For sure bro!! I pulled it a few times when I got my car, it's inevitable and you gotta take for account how many people do that on test drives when these cars have like 5 miles on them, I personally don't think that should affect it that sudden, have you tried taking it in for dealer?? It'll be under warranty.

[optimaxed]

Originally Posted by DonTheDon

Is it only when you first start your car? Mine does this after just starting it, then after about a minute of being on it stops and guess back to normal. Figure is a safety feature for temperature or fluids or something.

I have exactly the same things for about the 1st minute. I feel a little jolt from 1st to 2nd and 2nd to 3rd and then transmission is very smooth

[JeffHou73]

Originally Posted by optimaxed

I have exactly the same things for about the 1st minute. I feel a little jolt from 1st to 2nd and 2nd to 3rd and then transmission is very smooth

Thanks! The first minute or two is the worst, but still noticeable if I'm looking/thinking about it. But, usually after a couple of minutes I'm on roads where I can accelerate a little faster which eliminates/mask the issue. Not hard acceleration, but like you do if your target is 35-40 mph rather than 20-25 mph around the neighborhood.

[JeffHou73]

Originally Posted by Weiner0123

For sure bro!! I pulled it a few times when I got my car, it's inevitable and you gotta take for account how many people do that on test drives when these cars have like 5 miles on them, I personally don't think that should affect it that sudden, have you tried taking it in for dealer?? It'll be under warranty.

I was at the dealer today and drove with a foreman I like/trust a lot. Of course, neither of us could duplicate the darn issue with us both in the car. Maybe I just need to add 150 pounds of weight to the car...maybe that adds just enough required torque to eliminate/mask the issue!! lol Seriously - I drove 25 miles each way to then not be able to duplicate. The good news is that tempers my concerns that I could have done any irreparable damage during break in! I expect I'll drive another 500 miles or so (only have about 550 miles now) and then try again at the dealer. Will keep you posted.

[Giggler]

i know this might sound tedious, but if you have a recurring problem that you cannot replicate to a tech, maybe go get yourself a small journal at the dollar store so you can record the behavior each time it occurs... noting the date, time, road conditions, and ambient temperature. a pattern may surface that you did not see before.

[JeffHou73]

Originally Posted by Giggler

i know this might sound tedious, but if you have a recurring problem that you cannot replicate to a tech, maybe go get yourself a small journal at the dollar store so you can record the behavior each time it occurs... noting the date, time, road conditions, and ambient temperature. a pattern may surface that you did not see before.

Great idea, Giggler! I've thought about temperature - both ambient and engine temps. Thanks!

[HighlandPete]

Originally Posted by JeffHou73

Thanks...I would have expected what you are saying. I'm going to give it a few hundred miles and see if it settles out. I may have "learned" I'm an aggressive driver and now needs to learn that was temporary. My work around right now is to switch directly into Sport mode now on the neighborhood streets where you only go about 25-35 mph... this not only eliminates the symptom I'm having but takes it turns off the on/off start engine button... I'm pushing one of the two buttons regardless...so will go with Sport, for now. Once I'm on to over 25mph streets, will switch back to Comfort most of the time. I'm hoping this isn't a long term procedure but not horrible if it is.

The gearbox will be adapting in real time to your inputs, even your switching between modes is changing the adaptations.

Your 'sport to comfort' changes do seem to be the opposite to how we'd expect smooth operation. Comfort at low speeds should be the best for seamless changing, sport a little more feel through the gears. Can't see how any AT needs a sport program, to give a smoother shift pattern at low speeds.

I'd definitely experiment with how you drive. Note your throttle inputs, how you brake, etc., see how different inputs affect the smoothness of the gearbox. See if the gearbox adaptations (as you drive) are involved.

[JeffHou73]

Originally Posted by HighlandPete

The gearbox will be adapting in real time to your inputs, even your switching between modes is changing the adaptations.

Your 'sport to comfort' changes do seem to be the opposite to how we'd expect smooth operation. Comfort at low speeds should be the best for seamless changing, sport a little more feel through the gears. Can't see how any AT needs a sport program, to give a smoother shift pattern at low speeds.

I'd definitely experiment with how you drive. Note your throttle inputs, how you brake, etc., see how different inputs affect the smoothness of the gearbox. See if the gearbox adaptations (as you drive) are involved.

Thanks a lot, Pete! You are the first person I've ever heard confirm/support that the transmission is truly adaptable and can change with your (good and bad) habits. I thought I'd give it some time in case I've confused it early on. What is a bit odd, but maybe not expected...if I am in the neighborhood where 20-25 mph may be the max speed (officially), that departing a stop sign at minimal acceleration, you can see the rpm's change with each gear change and it ends up in 4th gear in what seems to possibly skip 3rd gear or only momentary just pass thru it. At 30, its all the way up to 5th gear... seemed a bit odd. It could be if I've been accelerating to 25mph in about 1-2 seconds max, the transmission thinks knows its time to be in 4th gear as soon as I stop accelerating. I can't believe anything should be wrong with the engine or tranny, so hoping just some break-in and learning may be all I need. I've only got about 575 miles so far....so well within break in period anyhow. Thanks again!

[HighlandPete]

Originally Posted by JeffHou73

Thanks a lot, Pete! You are the first person I've ever heard confirm/support that the transmission is truly adaptable and can change with your (good and bad) habits. I thought I'd give it some time in case I've confused it early on. What is a bit odd, but maybe not expected...if I am in the neighborhood where 20-25 mph may be the max speed (officially), that departing a stop sign at minimal acceleration, you can see the rpm's change with each gear change and it ends up in 4th gear in what seems to possibly skip 3rd gear or only momentary just pass thru it. At 30, its all the way up to 5th gear... seemed a bit odd. It could be if I've been accelerating to 25mph in about 1-2 seconds max, the transmission thinks knows its time to be in 4th gear as soon as I stop accelerating. I can't believe anything should be wrong with the engine or tranny, so hoping just some break-in and learning may be all I need. I've only got about 575 miles so far....so well within break in period anyhow. Thanks again!

There is a lot of confusion on driver influenced adaptations. Such thinking as the last driver's style is influencing the current drive. That is not the way it works. To quote; "Driver type adaptation offers a temporary adaptation of the basic map". "The 8HP is also equipped with ASIS (Adaptive Shift Strategy), which mirrors the driver’s mood within seconds".

The other thing that often causes confusion, is the actual gearbox adaptation values, values that can be reset, (typically after gearbox repairs), which require a relearn procedure. But that is a completely different subject and function than driver influenced adaptions. Gearbox values are automatically adapting/changing, allowing for clutch wear, clutch pressure & fill times, etc.

[JimmyCas]

Originally Posted by JeffHou73

Thanks a lot, Pete! You are the first person I've ever heard confirm/support that the transmission is truly adaptable and can change with your (good and bad) habits. I thought I'd give it some time in case I've confused it early on. What is a bit odd, but maybe not expected...if I am in the neighborhood where 20-25 mph may be the max speed (officially), that departing a stop sign at minimal acceleration, you can see the rpm's change with each gear change and it ends up in 4th gear in what seems to possibly skip 3rd gear or only momentary just pass thru it. At 30, its all the way up to 5th gear... seemed a bit odd. It could be if I've been accelerating to 25mph in about 1-2 seconds max, the transmission thinks knows its time to be in 4th gear as soon as I stop accelerating. I can't believe anything should be wrong with the engine or tranny, so hoping just some break-in and learning may be all I need. I've only got about 575 miles so far....so well within break in period anyhow. Thanks again!

Hi! Same here on my G20... When I drive at low speeds, gear shifting is rough, it feels like a small "over acceleration" when 2nd and 3rd gear shift. I've took the car to the bmw and they reset the trans but I don't feel any difference. Did you get any solution?

[oonowindoo]

Originally Posted by JimmyCas

Hi! Same here on my G20... When I drive at low speeds, gear shifting is rough, it feels like a small "over acceleration" when 2nd and 3rd gear shift. I've took the car to the bmw and they reset the trans but I don't feel any difference. Did you get any solution?

If you were in sport or sport+ while driving "normally" that would be the feeling you are describing.

In sport, especially sport+ and if you leave the car in auto, more so in Sport Auto, the car would keep in lower gear as long as they could, in case if you need WOT at any moment.

The car in those mode does not like be driven "normally". Using paddle shifter would help tho.

You shouldnt feel anything like if you leave everything in comfort without Sport Auto (shifter to the left).

Individual Sport with Transmission in comfort is the best all around option.

[JimmyCas]

Originally Posted by oonowindoo

If you were in sport or sport+ while driving "normally" that would be the feeling you are describing.

In sport, especially sport+ and if you leave the car in auto, more so in Sport Auto, the car would keep in lower gear as long as they could, in case if you need WOT at any moment.

The car in those mode does not like be driven "normally". Using paddle shifter would help tho.

You shouldnt feel anything like if you leave everything in comfort without Sport Auto (shifter to the left).

Individual Sport with Transmission in comfort is the best all around option.

I feel this rough shift in all modes, not only sport (eco mode or even if I shift gears in manual mode, it makes the same "over acceleration" when gear shift (mainly from 1 to 2 and 2-3). I took the car to the dealer for 2nd time this month. First time they told me they had reset electronics (I suppose they reset adaptations values) but issue still there. I leave the car last week again and tomorrow will take again. What dealer said is that everything they see seems to be fine and they have apply new electronic resets. I've try other automatic cars (Toyota and Audi) and I don't think this gearbox is fine...

[oonowindoo]

Originally Posted by JimmyCas

I feel this rough shift in all modes, not only sport (eco mode or even if I shift gears in manual mode, it makes the same "over acceleration" when gear shift (mainly from 1 to 2 and 2-3). I took the car to the dealer for 2nd time this month. First time they told me they had reset electronics (I suppose they reset adaptations values) but issue still there. I leave the car last week again and tomorrow will take again. What dealer said is that everything they see seems to be fine and they have apply new electronic resets. I've try other automatic cars (Toyota and Audi) and I don't think this gearbox is fine...

Why dont you ask to test drive another 330i while you are at the dealer and see if it feels the same. If it feels significantly different, you can ask the SA to take a ride with you.

I have driven plenty of ZF8 with different BMW models, i have yet experienced anything like that except when in sport+ in the city that the car really hates to upshift during normal acceleration.

[Akin1234]

Originally Posted by JimmyCas

I feel this rough shift in all modes, not only sport (eco mode or even if I shift gears in manual mode, it makes the same "over acceleration" when gear shift (mainly from 1 to 2 and 2-3). I took the car to the dealer for 2nd time this month. First time they told me they had reset electronics (I suppose they reset adaptations values) but issue still there. I leave the car last week again and tomorrow will take again. What dealer said is that everything they see seems to be fine and they have apply new electronic resets. I've try other automatic cars (Toyota and Audi) and I don't think this gearbox is fine...

Have you found a solution to this? My car is the same and wasn’t like that before. I started to notice this after they changed my dpf and engine mount for a different problem. It almost glides forward when it changes gear(between 1st to 3rd gear mainly). Mine is now out of warranty and I try not to think much of it. After driving for a bit it does settle tho and becomes less apparent.