asc vs. dtc

[Ridgeway]

I assume dtc is the next gen. of asc, but how exactly are they different?
I havn't been able to notice any real difference yet between the two in my Z's...

[SilverStreak]

dTc or dSc? 2001+ Z3's had DSC. Did they change the name to DTC for the Z4?

[Kevlar]

By definition...

Automatic Stability Control + Traction (ASC+T).
Automatic Stability Control + Traction (ASC+T) is a subfunction of DSC and prevents the drive wheels from spinning. This ensures optimum traction and driving stability. If one wheel of the drive axle is on stable ground but the other is on a slippery or loose surface, the wheel that is threatening to skid is therefore braked as much as possible until the other wheel can regain its grip. And in order to generate extra wheel spin when required, for example when 'rocking' the car out of snow, you can deactivate the ASC+T function.

Dynamic Stability Control (DSC).
Dynamic Stability Control (DSC) not only optimises driving stability when starting or accelerating, it also improves traction. In addition, the system recognises unstable driving conditions such as under - or oversteering and helps to maintain a safe course for the vehicle. Advanced sensory technology monitors the wheel rotation speed, lateral acceleration and the yaw rate (rotation around the vertical axis). This data is processed to obtain information about the automobile as it is currently moving, and is compared with data about how it should be currently moving, as supplied by the accelerator and the angle of the steering wheel. If these two lists of data do not match and the automobile's stability is threatened, DSC is activated and influences the brake system or the engine management. This action helps prevent dangerous situations such as skidding.

Dynamic Traction Control (DTC).
Compared to Dynamic Stability Control (DSC), Dynamic Traction Control (DTC) provides rear wheel vehicles with greater propulsion. This increased strength serves different purposes depending on the type of automobile. In the 5 Series and 7 Series, for example, it is ideal for straight stretches of road, and for maximum power when driving in snow or sleet. In the 3 Series and Z4 Roadster, DTC also plays a role when on bends - it enhances the car’s propulsion and its sports-style qualities. The driver is in full control of their vehicle within a predetermined parameter: the regulatory functions are inactive. DSC optimises directional stability within certain boundaries.

[SilverStreak]

Ah, well, there you have it.... Thanks, Kev!

[///Samson]

My ASC kicks ass in the snow.... Although it does have some give - which might allow a slide into a curb just a foot or two away.

[Ridgeway]

very interesting, thx kevlar

one more question on the note of dtc then: is it less functional vs. dsc regarding actualy traction control ie in snow- from what I read it seems that dsc would provide more "true traction control functions/features"(just thinking about driving in the snow here of course, with proper tires naturally)?

[Kevlar]

DTC is working to provide straight line acceleration (less complicated) compared to DSC is working to keep the car pointing in the direction you want to go (more compicated).

DTC only has to reduce power and apply brakes to the spinning wheel in the event of acceleration. DSC has to calculate which way you want to go, which way the car is going... and how to rectify the problem.

[Ridgeway]

i see, thx for clarification :)

[fastfour]

So what is the difference in my 330Ci when I just touch the DSC button and the hazard warning comes on as opposed to holding it down until the brake light comes on? What is activated/deactivated in each mode?

Zach

[Kevlar]

Originally posted by fastfour
So what is the difference in my 330Ci when I just touch the DSC button and the hazard warning comes on as opposed to holding it down until the brake light comes on? What is activated/deactivated in each mode?

Zach

When you push the button initially and the triangle in the middle of your dash lights up... you are disabling the ASC+T functions. You can get crazy wheel spin while going forward. However, the car will still continue in a straight line where the steering wheel indicates you want to go.

When you push the button down and hold it down, initially the triangle will light up indicating the ASC+T is disabled, but then the yellow brake light will come on indicating that all other functions DSC, DTC and CBC (to be explained later) are disabled. You can get all the wheel spin you want, plus now you can get the car to pivot around the Y-axis sliding and spinning as you wish.

More information about CBC.

Cornering Brake Control (CBC).
Cornering Brake Control (CBC) assists drivers when braking gently on a curve. The redistribution of the vehicle's weight as it turns can cause it to oversteer if they brakes are applied. CBC counteracts this tendency: it stabilises the automobile by applying brake pressure to one side of the automobile, even if the driver brakes outside the normal range of ABS.

[fastfour]

Awesome Kevlar, thank you very much :buttrock