[BarrettDB]

I have a 2024 X1m35i, and it not only has the various iDrive 9.x bugs (such as the audio cutting out every few minutes for about a second), but it suffers from the terrible lag related to the AS/S and DCT. On my vehicle, in personal or efficient mode, the lag is more than a second.

I've now driven two 2025 X1m35 vehicles (at separate locations), and not only does the software seem improved, but the AS/S + dual clutch seems far better (although not as good as when in sport mode).

I also noted that on the window sticker for my 2024 X1, the transmission is listed as "dual clutch Automatic" and on the window sticker for the MY2025 X1m35, the transmission is listed as "Steptronic" with Dual Clutch. Is this just marketing, or has BMW made any changes (including software) to improve the performance?

There are some other small changes - the display is slightly different (fonts), and the warm up icon in blue is a bit different. I know there are a few improvements such as standard heated front seats, an included personal eSIM 5G, and updated iDrive (QuickSelect? - is that just shortcuts?). Does anyone have any other information about updates, especially related to the AS/S and DCT?

[MontyB1]

Mechanically they are all identical steptronic is an old BMW marketing same around autos. What you might not have is the latest firmware levels that some say has improved things.

Check if any update is available and post what the current firmware is. 11/2024 is the very latest at the moment.

[BarrettDB]

Originally Posted by MontyB1

Mechanically they are all identical steptronic is an old BMW marketing same around autos. What you might not have is the latest firmware levels that some say has improved things.

Check if any update is available and post what the current firmware is. 11/2024 is the very latest at the moment.

My X1m35 is using the 11/2024 update. The lag is almost dangerous. The lag in other X1m35s I've driven is not nearly as bad. It's been in the shop four times for this and related issues. Make no mistake - with the exception of what I've noted, the X1m35 is a fun, engaging, and ideal daily driver.

[kenrok1]

Originally Posted by BarrettDB

... included personal eSIM 5G...

sorry I know this has nothing to w your DCT question, but it doesn't work anyhow... this is all I could find on here:

https://u11.bimmerpost.com/forums/sh....php?t=2130930

I've got two M35i's build dates of 11/7/24 and 11/11/24 and it just shows "incompatible" in the app.

[Rayneman]

I've had my X1 M35i for a week now. Coming from a 330, I do not tolerate the AS/S, so while its unfortunate its not a simple buttom press, it is now a swipe and a press if not using Sport mode. I don't think that's a huge deal or the end of the world. In any event, I don't experience these issues with "lag" or whatever. I am used to a turbo 4, so don't expect any monstrous, immediate acceleration. Even so, this thing still moves, and moves pretty well in sport mode.

EDIT: to say, I am not discounting anyone's experience otherwise.

[BarrettDB]

Originally Posted by kenrok1

sorry I know this has nothing to w your DCT question, but it doesn't work anyhow... this is all I could find on here:

https://u11.bimmerpost.com/forums/sh....php?t=2130930

I've got two M35i's build dates of 11/7/24 and 11/11/24 and it just shows "incompatible" in the app.

Thanks for sharing. Appreciate it.

[BabyX6]

Originally Posted by BarrettDB

I have a 2024 X1m35i, and it not only has the various iDrive 9.x bugs (such as the audio cutting out every few minutes for about a second), but it suffers from the terrible lag related to the AS/S and DCT. On my vehicle, in personal or efficient mode, the lag is more than a second.

I've now driven two 2025 X1m35 vehicles (at separate locations), and not only does the software seem improved, but the AS/S + dual clutch seems far better (although not as good as when in sport mode).

I also noted that on the window sticker for my 2024 X1, the transmission is listed as "dual clutch Automatic" and on the window sticker for the MY2025 X1m35, the transmission is listed as "Steptronic" with Dual Clutch. Is this just marketing, or has BMW made any changes (including software) to improve the performance?

There are some other small changes - the display is slightly different (fonts), and the warm up icon in blue is a bit different. I know there are a few improvements such as standard heated front seats, an included personal eSIM 5G, and updated iDrive (QuickSelect? - is that just shortcuts?). Does anyone have any other information about updates, especially related to the AS/S and DCT?

Hello there. In case you haven't tried this, I've got something for you... and while this isn't a cure, it is a temporary but also easy band-aid to the problem.

Considering the lag is akin to the "bog" one might experience in a manual transmission when having not given the car enough gas off the line in 1st gear... then the only way to "give it more gas" is by increasing the idle RPM.

Kick the transmission into S, as seen on the photo. While at a stop, you'll notice the idle RPM increase by nearly double to 1400rpm. I experience zero lag or bog from this simple change. Now granted I also have AS/S deleted which helps significantly as well.

[jimma_uk]

I have a 2025 m35, and I have often wondered if there was some difference somewhere. My car definitely doesn’t have the same level of lag that others have previously mentioned. Is it software, hardware, or am I imagining it? I can’t say for certain, but I’d be surprised if something hasn’t changed and your experience reinforces that in me.

As for start/stop, I always have it off so can’t comment on that.

[BarrettDB]

Originally Posted by BabyX6

Hello there. In case you haven't tried this, I've got something for you... and while this isn't a cure, it is a temporary but also easy band-aid to the problem.

Considering the lag is akin to the "bog" one might experience in a manual transmission when having not given the car enough gas off the line in 1st gear... then the only way to "give it more gas" is by increasing the idle RPM.

Kick the transmission into S, as seen on the photo. While at a stop, you'll notice the idle RPM increase by nearly double to 1400rpm. I experience zero lag or bog from this simple change. Now granted I also have AS/S deleted which helps significantly as well.

[IMG]https://u11.bimmerpost.com/forums/picture.php?
albumid=24589&pictureid=106458[/IMG]

Thanks, but that has no effect. Tried that months ago and with each software update. The real culprit is the DCT, and with higher revs, the starts to move slightly, then bogs down. Appreciate the input!

[BarrettDB]

Originally Posted by jimma_uk

I have a 2025 m35, and I have often wondered if there was some difference somewhere. My car definitely doesn’t have the same level of lag that others have previously mentioned. Is it software, hardware, or am I imagining it? I can’t say for certain, but I’d be surprised if something hasn’t changed and your experience reinforces that in me.

As for start/stop, I always have it off so can’t comment on that.

Thanks! My experience driving several MY25 X1m35s is the lag is far less pronounced.

[BabyX6]

Originally Posted by BarrettDB

Thanks, but that has no effect. Tried that months ago and with each software update. The real culprit is the DCT, and with higher revs, the starts to move slightly, then bogs down. Appreciate the input!

That's wild to me, but you may be on to something then with pre-MY2025. Having deleted AS/S, I hardly notice the bog. But when I want to eliminate it completely, I shift the tranny into S and it's 100% gone every single time.

[mere]

I had the same issues with music stopping for a few seconds, since the day I got the car. I took the car multiple times and finally talked to the manager and they talked to BMW corporate and after 6 visits to the service center they finally figured it out and it was some electrical cable that was connected to the Bluetooth. And it works fine now!

[saltydog]

Question so if you shift it into sport mode then switch it out of sport
mode is the start/stop turned on again? I assume so.

[J-RO]

Originally Posted by saltydog

Question so if you shift it into sport mode then switch it out of sport
mode is the start/stop turned on again? I assume so.

That would be correct.

[Spdrush]

ASS does not reactivate when Sport is selected and then deselected at a stop light. It stays off until the car stops again and then the ASS is reactivated and shuts off the engine.

[saltydog]

Thx I was going to try that. So that's a one (really two) button
solution till u turn the car off.

[JOHNBMWM5]

Originally Posted by jimma_uk

I have a 2025 m35, and I have often wondered if there was some difference somewhere. My car definitely doesn’t have the same level of lag that others have previously mentioned. Is it software, hardware, or am I imagining it? I can’t say for certain, but I’d be surprised if something hasn’t changed and your experience reinforces that in me.

As for start/stop, I always have it off so can’t comment on that.

Hi I am test driving the 2024/5 X2M35i from bmw uk (loaner), I have seen this Lag problem on videos and it would bother me in town/local driving, how do you find yours please, thanks.

[richiro]

Originally Posted by Spdrush

ASS does not reactivate when Sport is selected and then deselected at a stop light. It stays off until the car stops again and then the ASS is reactivated and shuts off the engine.

This is only true if all of the drivetrain and dynamic settings are all set to “sport” or “sport plus”. If you leave the drivetrain toggled on “comfort” it will reactivate ASS, so will toggling into efficient mode.

[Spdrush]

Not true with my M35i. Not sure with Efficient Mode (don't use it) but with Personal Mode selecting Sport with the transmission selector ASS turns off.
Returning the gear selector to Drive the ASS stays off and the engine continues to run.

[richiro]

Originally Posted by Spdrush

Not true with my M35i. Not sure with Efficient Mode (don't use it) but with Personal Mode selecting Sport with the transmission selector ASS turns off.
Returning the gear selector to Drive the ASS stays off and the engine continues to run.

You’re referring to toggling the transmission from “D” to “S” (sport), not Sport Mode. Those are different actions.

[Spdrush]

That's what I'm saying. Pull gear selector to S(port) not Sport Mode. ASS allows engine to start.
You can accelerate with gear selector in S(port) or you can select D. ASS will not shut off engine so you can choose to accelerate using D or S.

[jimma_uk]

Originally Posted by JOHNBMWM5

Hi I am test driving the 2024/5 X2M35i from bmw uk (loaner), I have seen this Lag problem on videos and it would bother me in town/local driving, how do you find yours please, thanks.

Really not that bad at all, in fact, hardly noticeable. I’ve done a real mixture of town and motorway driving, including a real nice run down the A303 this week and can’t say I’ve really experienced any lag.

Having had a F40 M135 before this, I actually think the gearbox is better on the X1.