[sauce25]

Hello All,

Not sure if I am using the right terms but I am referring to the lag that occurs when I start to press the throttle. Nothing happens in the first 1” of movement and then it launches. If you press light and hold for a sec it then starts to move. There's like a 1-2 sec delay. Have any of you they may be experiencing this found a solution without a tune? It's the same with Sport and Sport Plus. It even happens using the paddles. My 2018 540 had it too but in Sport you had acceleration right as the paddle moved. Thanks in advanced for you replies.

Sauce

[F1A]

Hello Sauce25. I hope everything is well with you. This is the identical problem I'm experiencing in my '21 559. I just visited the dealer last week for oil service and they updated the software that was supposed to fix this. No difference at all. It's dangerous when I need to make a quick left turn, or try to pass from red light when my lane ends. I believe software is supposed to address lag when using launch control only. I will inquire with dealer and let you know.

[Kriz2fer]

Originally Posted by F1A

Hello Sauce25. I hope everything is well with you. This is the identical problem I'm experiencing in my '21 559. I just visited the dealer last week for oil service and they updated the software that was supposed to fix this. No difference at all. It's dangerous when I need to make a quick left turn, or try to pass from red light when my lane ends. I believe software is supposed to address lag when using launch control only. I will inquire with dealer and let you know.

2022 should already have the fix for software

[F1A]

My software update did not fix the lag. Curious to know if the update fixed yours.

[Kriz2fer]

Originally Posted by F1A

My software update did not fix the lag. Curious to know if the update fixed yours.

0-60 times pre and post update are proven to drop times by .5 seconds. Numerous testing magazines and others have shown the difference.

[Manley00]

My 2020 was doing just this…. Then it dawned on me. In mine it was Traction Control limiting throttle. It was sensing wheel slip when I had on all nanny systems. Try it with all off by holding TC button down for 5 seconds. You can also try just disabling part of the system with one press. If you do have the newest update it should have addressed the previous issues. One way to tell is by utilizing launch control and seeing what RPM it holds at. That was one of the larger differences in the updated software. If it pins at 3k you’re updated. It try the TC first and see if that’s what’s causing it.

It genuinely scared me a few times because it fell flat on its face jumping out in traffic. Now, before I do that, I disable.

Good luck!

[F1A]

Manley, thanks for the detailed description on what to try. I thought the trac control may help for non-launch starts. I'll try full disable. I've never tried launch control, and don't care much about the 0-60 time (sounds funny coming from a fellow 550 owner The lag becomes a serious issue when making a quick left turn or quick launch when my lane ends.

[NGT2]

I keep all traction control on. I didn't notice any real lag this morning on my commute. I don't floor it every time I start from a stop, but I'm pretty heavy relative to normal traffic.

[Brucelinc]

My '22 has no lag at all. The tip-in is not as aggressive as some cars I have driven but I prefer that. It is much smoother in stop & go traffic.

I did test drive a used 2019 model before ordering mine and it definitely had dead spot in the first bit of throttle travel but I assumed that was something that just needed adjustment.

[modthispny]

It is the traction control. My Dinan tuned 2019 M550i did this for 80% of my lease and I discovered it just a few months before having to return it - definitely wish I had known this during the entire lease term. The BMW traction control is very sensitive, and even though the TC light does not show on the dash, it's definitely doing it's thing.

Just tried on my 22 540i as well - with TC off the car is considerably faster when I hold it in 1st and hit the throttle at 15 mph.

[F1A]

Agreed, rolling start def. helps. Seems silly that I have to deactivate traction control every time I want a fast start. I thought update would fix this, or is it just for launch control starts?

[modthispny]

Originally Posted by F1A

Agreed, rolling start def. helps. Seems silly that I have to deactivate traction control every time I want a fast start. I thought update would fix this, or is it just for launch control starts?

the update was just for the launch control.

[SomaM550i]

Yea, I'm not seeing this at all. Instant power. Sports Plus Mode or die.

[F1A]

Something is still off on my end. Tried to accelerate from a stop to pass into another lane - bogged down for 1 sec. Was in adaptive mode. also happened in comfort. next test is Sport or sport +. I haven't tried launch control - modthispny confirmed software update fixed this. This is great, but I def. won't use LC just for a jack rabbit start every time. I'm wondering if I'm expecting too much and comparing to my brother's Tesla 3 with instant torque?

[NGT2]

Originally Posted by F1A

Something is still off on my end. Tried to accelerate from a stop to pass into another lane - bogged down for 1 sec. Was in adaptive mode. also happened in comfort. next test is Sport or sport +. I haven't tried launch control - modthispny confirmed software update fixed this. This is great, but I def. won't use LC just for a jack rabbit start every time. I'm wondering if I'm expecting too much and comparing to my brother's Tesla 3 with instant torque?

Are you sure it's really a second and not more like a fraction of a second? I could see where maybe you'd feel the difference between that and the Tesla.

[F1A]

Good point. So it feels like a second, but still feel the hesitation vs example wife's 10 yrs old Forester which feels quicker off the line, ie that jump feeling. It sounds like I'm exaggerating, but there's def a heaitation. I don't care about losing 10ths for 0-60, just need that quik response to start moving.

[Brucelinc]

Originally Posted by F1A

Good point. So it feels like a second, but still feel the hesitation vs example wife's 10 yrs old Forester which feels quicker off the line, ie that jump feeling. It sounds like I'm exaggerating, but there's def a heaitation. I don't care about losing 10ths for 0-60, just need that quik response to start moving.

You should not expect ANY hesitation at all whether moving away at part throttle or full throttle. As I said before, the tip-in (first quarter inch of accelerator) is more gentle than some other cars but it not a hesitation.

With drive by wire throttle, automakers can set up whatever throttle mapping they want. Some like to have the first part of throttle fairly aggressive so the customer thinks the car is more powerful than it really is.
The BMW throttle mapping (at least on my '22 M550) is very progressive...not jumpy at light throttle but quite brutal at full throttle.

[F1A]

So far, it seems I'm the only one experiencing this lag (apart from the originator of this thread-sauce25). I've discounted the software update as it only addressed the launch control issue. So 1st 1" of travel = 1 sec delay (or feels like it). I don't know what else to try. I just mash the pedal and expect an instant response. Am I asking too much from 2 turbos and 553 ft-lbs?
I will ask dealer mechanic to drive it and if there's another LCI 550 to compare.

Any suggestions?

[Brucelinc]

Originally Posted by F1A

So far, it seems I'm the only one experiencing this lag (apart from the originator of this thread-sauce25). I've discounted the software update as it only addressed the launch control issue. So 1st 1" of travel = 1 sec delay (or feels like it). I don't know what else to try. I just mash the pedal and expect an instant response. Am I asking too much from 2 turbos and 553 ft-lbs?
I will ask dealer mechanic to drive it and if there's another LCI 550 to compare.

Any suggestions?

Definitely have a tech drive it and also test drive another LCI 550 if you can find one. I wish you could drive mine. I guarantee you would find NO hesitation.

[sunny27]

This is exactly same issue I have and started diff thread — https://g30.bimmerpost.com/forums/sh...9#post28788739

I taught I am alone and I was expecting too much, but it’s true there is some lag. I partially went through all above messages, I will take a deep dive tomorrow. Any suggestions please as I have same page when I press accelerator from Stan still, my Honda odyssey’s jerks pretty quick from stand still compare to my new 540, but once the 540 picks after 2 seconds, say from 2nd press on accelerator, it flies like a flight..

[NGT2]

This is a dumb question, I'm sure, but why don't you just press harder on the accelerator?

[Brucelinc]

We should distinguish hesitation from soft tip-in. If I understand the OP, pressing the accelerator results in NOTHING happening for a split second. That is an unacceptable hesitation. That is different than having the first part of accelerator movement provide gentle but immediate acceleration.

I cannot imagine why anyone would want a jerky take-off at light throttle. That would make parking or driving in heavy stop & go traffic a herky jerky jumpy affair. My 550 has a more gentle tip-in (first 1/4 inch of throttle) than my Ford Ranger pick-up. However, beyond that initial 1/4 inch, there is no comparison in acceleration. Neither vehicle has hesitation.

If a quick punch of the throttle (beyond the first 1/4 inch) on a 550 doesn't instantly slam your head against the head restraints, something is wrong.