[Montaver]

The C7 had multi stage DSC (known as PTM) as well. Ultimately all manufactures are using the same electronics/sensors developed by Bosch etc., only the calibration is different. BMW are not at the cutting edge here by any stretch, this is probably the first BMW implementation of DSC that is actually usable in a track setting without being overly intrusive.

[Remonster]

Originally Posted by jimbethesda

I sent an email to BMW and got two very ambiguous answers back. I'm glad to hear I'm not the only one with this question. As a stand alone feature, I (think) I understand M Traction Control. It's how it compares to MDM that it becomes fuzzy. I almost always drive my F80 in MDM. I love it, but there are times that I wish for a little more slip. Many in the US code in "Euro MDM" for that very reason. When I first read about M Traction Control, I was very excited. Still trying to figure out how MDM fits it.

Will I stop using MDM all together since now I can fine tune the setting? Are they completely different?

I don't have an answer for how MDM compares to the 10-stage traction control but I do know that you still have DSC on, MDM, and then DSC off. If you have the M Drive Professional option, switching DSC off allows you to select from 0-10 with 0 being fully and completely off.

[Boss330]

Explained by BMW in the Q&A to the video.

MDM and variable TC operates in different ways, where MDM applies DSC (incl brake activation) to straighten the car. In variable traction control you have no brake operation to straighten the car, it's just traction control to control the slip (basically a drift aid &#128521.

[jimbethesda]

Originally Posted by Boss330

Explained by BMW in the Q&A to the video.

BOOM! Thanks!

[CanAutM3]

Originally Posted by jimbethesda

Yup, got that part. How does M Traction control level 10 differ from MDM?

Originally Posted by jimbethesda

I'm not sure either. How about this. If MDM were instead an M traction control level, what would it be? 8? 10? 15? NA, they are completely different?

My understanding is that MDM is simply a more permissive mode of the DSC system that allows for more potential slip before interveening, but it still uses individual wheel brake application in conjunction with limiting the engine power output to control the attitude of the car. The TC system only uses engine torque output management without brake application to manage slip, so the driver still needs to manage the steering wheel. In essence, the 10-step TC system is a bit like an auto throttle.

[PLF69]

Originally Posted by CanAutM3

My understanding is that MDM is simply a more permissive mode of the DSC system that allows for more potential slip before interveening, but it still uses individual wheel brake application in conjunction with limiting the engine power output to control the attitude of the car. The TC system only uses engine torque output management without brake application to manage slip, so the driver still needs to manage the steering wheel. In essence, the 10-step TC system is a bit like an auto throttle.

I anticipate that the confidence this system could give me is going to be costly in tire wear

[CanAutM3]

Originally Posted by PLF69

I anticipate that the confidence this system could give me is going to be costly in tire wear

I'd say it is the other way around. MDM use the front brake quite significantly to manage the car's attitude on track putting an even greater burden on the front tires. The new TC system should put significantly less burden of the front tires.

[PLF69]

Originally Posted by CanAutM3

I'd say it is the other way around. MDM use the front brake quite significantly to manage the car's attitude on track putting an even greater burden on the front tires. The new TC system should put significantly less burden of the front tires.

Went to Sanair with the M2 yesterday and was carefully getting off after 15mins to save the front PS4S, I don't like to drive DSC off there and I take it easy first time of the season so MDM is was and you are right, it's hard on the front tires.

As for the G80/82 traction control I was mostly referring to the rears hehe

[CanAutM3]

Originally Posted by PLF69

Went to Sanair with the M2 yesterday and was carefully getting off after 15mins to save the front PS4S, I don't like to drive DSC off there and I take it easy first time of the season so MDM is was and you are right, it's hard on the front tires.

As for the G80/82 traction control I was mostly referring to the rears hehe

Nose heavy cars with narrower front tires will inherently destroy the fronts first. The G8X is no exception.

[emix84]

Is MDM a standard thing even on the 6 mt or do I need to tick the M drive professional to get it? I'm not particularly interested in the 10 stage traction control, it seems to be mostly a drifting aid... I do like having the back play a little but I would never drift a car on public roads. Not taking it to the track either. Also I assume that for people who truly know how to drift they wouldn't actually need the 10 stage TC to do it. Correct?

[CanAutM3]

Originally Posted by emix84

Is MDM a standard thing even on the 6 mt or do I need to tick the M drive professional to get it? I'm not particularly interested in the 10 stage traction control, it seems to be mostly a drifting aid... I do like having the back play a little but I would never drift a car on public roads. Not taking it to the track either. Also I assume that for people who truly know how to drift they wouldn't actually need the 10 stage TC to do it. Correct?

MDM is standard.

[VIERsr]

Originally Posted by CanAutM3

My understanding is that MDM is simply a more permissive mode of the DSC system that allows for more potential slip before interveening, but it still uses individual wheel brake application in conjunction with limiting the engine power output to control the attitude of the car. The TC system only uses engine torque output management without brake application to manage slip, so the driver still needs to manage the steering wheel. In essence, the 10-step TC system is a bit like an auto throttle.

This.
The M Traction Control only manages traction (rear wheel slip), not stability like DSC or MDM (understeer/oversteer), it works like early Lotus traction controls or motorcycle traction controls by reducing power through ignition timing or throttle closure, not with the brakes.
DSC and MDM beyond a certain degree of yaw (lower with DSC, higher with MDM) brake the front wheels to prevent you from spinning, with MTC this does not happen, it only reduces the rear wheel power based on the level selected from 1 to 10.

[emix84]

How interventionist is the MDM? Is it variable for example if you're still in control through the steering wheel, does it allow you to straighten the car on your own or does it intervene every time according to preset parameters?

[PLF69]

Originally Posted by emix84

How interventionist is the MDM? Is it variable for example if you're still in control through the steering wheel, does it allow you to straighten the car on your own or does it intervene every time according to preset parameters?

It's really dependent on the situation, slip angle, yaw rate, steering angle, accelerator pedal position etc etc.

Yes you can steer back the car but only if you don't get to close to the MDM threshold limit, once you hit that it tries to straighten you back by applying the brakes in a very effective manner.

At least that's my experience with my M2 with GTS MDM coded in.