BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > The 6 drive modes of the F20
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      07-17-2012, 09:35 AM   #23
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what a great thread! Thanks ! I learnt a heck of a lot reading this.
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      09-05-2015, 05:36 AM   #24
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Hi 1addicts. Thanks a lot for the post and the forum is great. I'm new here, and already waiting for my 120i aut 3door hatch with M suspension and steering. I'm trying to figure it out how it is exactly driving in each mode, and still have doubts. First, where can I confirm that ADB is present, because apart from here I can't find it on any catalog or spec . It should behave as a limited slip diferential with some loss of power, but I guess will be enough for light drifting in favourable conditions. Second, can anyone explain what can and cant be done in each mode, from experience? for instance, does DTC allow some drifting or it corrects the car angle fully and only allows some wheelspin? And sport+ sets DTC or just all off but ADB, because accordind to the manual it just sets DSC off...has anybody tested the cars behaviour to the limits in each mode and setting? Cheers
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      09-05-2015, 06:00 AM   #25
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I have tested the car on the limit in all modes.

Sport+ is the same as DTC, but with Sport throttle mapping, where normal DTC has the Comfort mapping.

DTC has stability control enabled, but traction control pretty much disabled. You can have a lot of wheelspin, but limited sliding. If the car senses the car getting out of control, it will start braking and correcting the angle. As long as you do the right things as a driver to bring it back under control, it will not interfere. If you try to keep the car sliding, it will not allow it.

ADB is only present with DSC Off. If you drive in a corner, and enough power to provoke wheelspin on the inside, rear wheel, you can feel that the car brakes that wheel. The differential will transfer the torque to the outside wheel, so it does not really brake the car, but you can feel a slight rotation in the car towards the inside of the corner, killing the understeer you would otherwise expect in this situation. You can also go surprisingly early on the throttle in corners without wheelspin.

With DSC Off, it is possible to do drifting. The ADB is not as quick and smooth as a real, mechanical limited slip differential, and the turbo lag from the engine is also making the throttle response sluggish. Not the easiest car to drift, but definitely possible. The steering is quick, and the balance of the car is predictable.

The funny thing about the steering is that it feels rather dead when you drive the car slowly. There seems to be a lack of steering feel, even though the steering is quick and responsive. The steering feel is however there when you approach the limit. Even on snow and ice, you can still feel the available grip from the front wheels.
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      09-05-2015, 07:12 AM   #26
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Perfecty and thoroughly explained ovekvam! This is exactly what I was wondering about the sports mode.

And for the confort mode and DSC, how do they work in light snow/rain (around 0ºC)? Are they reliable without winter tyres, as compared to older systems. I only have experience with ASR and ESP front drive but they worked astonishing good in bad climate conditions in Spain. Never had to use the chains and I could drive quite comfortably at 100kmh behind a snowplough truck.

Thanks a lot.

Quote:
Originally Posted by ovekvam View Post
I have tested the car on the limit in all modes.

Sport+ is the same as DTC, but with Sport throttle mapping, where normal DTC has the Comfort mapping.

DTC has stability control enabled, but traction control pretty much disabled. You can have a lot of wheelspin, but limited sliding. If the car senses the car getting out of control, it will start braking and correcting the angle. As long as you do the right things as a driver to bring it back under control, it will not interfere. If you try to keep the car sliding, it will not allow it.

ADB is only present with DSC Off. If you drive in a corner, and enough power to provoke wheelspin on the inside, rear wheel, you can feel that the car brakes that wheel. The differential will transfer the torque to the outside wheel, so it does not really brake the car, but you can feel a slight rotation in the car towards the inside of the corner, killing the understeer you would otherwise expect in this situation. You can also go surprisingly early on the throttle in corners without wheelspin.

With DSC Off, it is possible to do drifting. The ADB is not as quick and smooth as a real, mechanical limited slip differential, and the turbo lag from the engine is also making the throttle response sluggish. Not the easiest car to drift, but definitely possible. The steering is quick, and the balance of the car is predictable.

The funny thing about the steering is that it feels rather dead when you drive the car slowly. There seems to be a lack of steering feel, even though the steering is quick and responsive. The steering feel is however there when you approach the limit. Even on snow and ice, you can still feel the available grip from the front wheels.
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      09-05-2015, 09:19 AM   #27
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Quote:
Originally Posted by jabugui View Post
Perfecty and thoroughly explained ovekvam! This is exactly what I was wondering about the sports mode.

And for the confort mode and DSC, how do they work in light snow/rain (around 0ºC)? Are they reliable without winter tyres, as compared to older systems. I only have experience with ASR and ESP front drive but they worked astonishing good in bad climate conditions in Spain. Never had to use the chains and I could drive quite comfortably at 100kmh behind a snowplough truck.

Thanks a lot.
Compared to older systems, the DSC is more advanced. The old systems could be dangerous if the driver and the DSC had the same reaction. Then you could experience overcorrections and get out of control. The modern DSC system is faster, and will step aside when the driver has the correct reflex. For safe driving, it works very well. For performance driving, it tends to brake too much.

The one series is very well set up, and also rather safe to drive in slippery conditions with DSC disabled. The car will usually neither understeer nor oversteer, but start sliding with all four wheels when you drive too fast in a corner.

The driving condtions around zero degrees on wet days can be very dangerous. If the ground is below zero, the rain drops can freeze upon impact, and form black ice. That is perhaps the most slippery conditions possible, and extremely demanding even with winter tyres.

At other times, it is just a wet road, and then summer tyres work fine. It is however impossible to spot the difference just by looking at the road.
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      09-05-2015, 10:55 AM   #28
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Another concern for me is the tyre width, as I'm getting 225/45R17. I guess 205 should be more than enough width for the small engine 1.6L and better under wet or snow. How is your experience with them and interaction with the controls.

Here some interesting links to summarize.

http://www.1erforum.de/bmw-m135i-m23...me-197601.html

Lots of info in this german forum, that table contains all detail.

CBC
http://www.bmw.com/com/en/insights/t...e_control.html

EcoPRO OR Confort OR Sport (DSC enabled)
DSC
http://www.bmw.com/com/en/insights/t...y_control.html

Sport+ OR Traction (DSC disabled, DTC enabled)
DTC
http://www.bmw.com/com/en/insights/t...n_control.html

DSC Off (DSC,DTC disabled, ADB only, Comfort throttle mapping only
http://f20.1addicts.com/forums/showp...4&postcount=38)
ADB
http://www.bmw.com/com/en/insights/t...erential_brake

Last edited by jabugui; 09-05-2015 at 02:55 PM..
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      09-05-2015, 11:20 AM   #29
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I think the ADB-X link is for four wheel drive cars.

I have tested the 116i with both 205 and 225 tyres for summer use. I had slightly better lap times even in dry conditions with 205 than 225, so I agree that 225 is probably a bit too wide for that kind of power output. The handling and feel from the driver seat is too similar for me to notice any difference. Maybe slightly more road noise with the wider tyres.

In winter conditions, narrow tyres work best on snow and slush, and wide tyres work best on ice. In Norway, I always use dedicated winter tyres in the winter, and they are 205.
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      09-06-2015, 04:12 AM   #30
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Indeed in traction fully off mode you have stiffer steering but pedal is in comfort mode (not sport+ setting).

I always drive in this mode.
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      09-06-2015, 11:51 PM   #31
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...and all the modes besides DSC off + manual shifting are COMPLETELY useless
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      09-07-2015, 11:27 PM   #32
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Ovekam advised me of the ADB, and I usually drive in this mode most of the time now. Except when I activate the speed limiter or cruise control (the computer switches off the ADB mode here).

The ADB reaction is not as quick as a real LSD with clutches. I've found the car will hop momentarily between left and right wheels breaking free from the road before the car actually slides. I used to own a Ford Escort RS Turbo, specifically the Series 1. The LSD in the RS Turbo feels the same as what the ADB does.
The car is very easy to control when it is drifting. However, as there is a bit of turbo lag, I've not yet tried to feather or tap the throttle repeatedly to maintain the drift. I'm concerned that if I let my foot off, the combination of fly-by-wire lag and turbo lag will cause the car to not be able to produce the required power to keep the wheels spinning when quickly hitting the throttle in an off - on - off - on kind of way. It would be nice to have sport mode mapping to the throttle here.
Since I have the ZF 8 speed, I have shifted from 2nd to 3rd whilst drifting (manual mode). RPM was climbing to just over 4k, but the shift seems to be not quick enough to transfer the power through the wheels and so changing gear causes the car to straighten up and accelerate. I don't know if there is any other computer related factors causing this, though. It may also be that the car doesn't produce enough power to do this. I've not tried this in the wet, though.
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      09-07-2015, 11:42 PM   #33
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In my M135i DSC Off doesn't replicate Sport+ - it gives

No DSC
No DTC/TC
Enables ADB
Sport steering
Sport chassis
Comfort throttle response

I'm quite impressed by the effectiveness of the ADB, both in increasing traction and in making the breakaway more controllable.
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      09-10-2015, 12:40 AM   #34
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Quote:
Originally Posted by dishy View Post
Ovekam advised me of the ADB, and I usually drive in this mode most of the time now. Except when I activate the speed limiter or cruise control (the computer switches off the ADB mode here).

The ADB reaction is not as quick as a real LSD with clutches. I've found the car will hop momentarily between left and right wheels breaking free from the road before the car actually slides. I used to own a Ford Escort RS Turbo, specifically the Series 1. The LSD in the RS Turbo feels the same as what the ADB does.
The car is very easy to control when it is drifting. However, as there is a bit of turbo lag, I've not yet tried to feather or tap the throttle repeatedly to maintain the drift. I'm concerned that if I let my foot off, the combination of fly-by-wire lag and turbo lag will cause the car to not be able to produce the required power to keep the wheels spinning when quickly hitting the throttle in an off - on - off - on kind of way. It would be nice to have sport mode mapping to the throttle here.
Since I have the ZF 8 speed, I have shifted from 2nd to 3rd whilst drifting (manual mode). RPM was climbing to just over 4k, but the shift seems to be not quick enough to transfer the power through the wheels and so changing gear causes the car to straighten up and accelerate. I don't know if there is any other computer related factors causing this, though. It may also be that the car doesn't produce enough power to do this. I've not tried this in the wet, though.
Lets see some video I have a bit on my youtube
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      09-14-2015, 11:50 PM   #35
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Quote:
Originally Posted by harkes View Post
Lets see some video I have a bit on my youtube
I want to, we'll see. I have a gopro I can attach somewhere but I need to find a friend that wont crap themselves when I do anything. There's nothing worse than having someone in the passenger seat that panics, can be quite dangerous and distracting. The only friend I know that is capable of this is the guy that showed me how to drift and he's in England.
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      09-16-2015, 08:45 PM   #36
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What you need the friend for? GoPro suction cup is your friend.
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