E89 DSC vs. DCT

[Vetracr]

I have read through all the BMW material I can find regarding the operation of the E89 and other BMW DSC and DCT systems. I have never read such vague and mealy mouthed explanations of how these features actually work and what they actually do. I mean specifically. Can anyone give me a good reference to what actually happens in DSC? What parameters are measured? What actions are implemented and by which system? The same for DCT. The systems are very similar but what are the specific differences? I know I'm not the only one who would like the answer to these questions. I've read many forum posts but most are speculation or suppositions. Can anyone point me to a site with real facts?

[paris1]

You must mean DSC and DTC. DCT stands for dual clutch transmission.

[Vetracr]

Originally Posted by paris1

You must mean DSC and DTC. DCT stands for dual clutch transmission.

Oops. 😕😕

[Zyal8r]

http://weblog.pac1.net/_Documents/14...escription.pdf

page 77

Even with the chart it is still confusing because of language interpetation.
DTC is a part of DSC but when you turn it on by pressing the button you turn off some of the functions of DSC which the translation confuses.
Also it has been "updated" over the years and depending on engine.
I know that autox turns will cause it to reduce throttle as well as apply brakes.

Would like to know if you are experiencing any fuel or oil starvation when autoxing.

[Tangent]

DTC: Uses wheel speed sensors to determine when the tires are spinning under acceleration. When turned on it will cut throttle to prevent burnouts.

DSC: Uses wheel speed, steering angle, and yaw sensors to determine if the car isn't heading the the direction the driver wants. When turned on this lets it detect understeer, oversteer, or 4 wheel slides and uses a combination of cutting throttle and braking individual wheels to get the car pointing in the right direction.

[Vetracr]

Originally Posted by Zyal8r

http://weblog.pac1.net/_Documents/14...escription.pdf

page 77

Even with the chart it is still confusing because of language interpetation.
DTC is a part of DSC but when you turn it on by pressing the button you turn off some of the functions of DSC which the translation confuses.
Also it has been "updated" over the years and depending on engine.
I know that autox turns will cause it to reduce throttle as well as apply brakes.

Would like to know if you are experiencing any fuel or oil starvation when autoxing.

Good question. I don't know. How can you tell about oil starvation without an oil pressure gauge. I always used to tee a low oil pressure light switch at the oil pressure gauge sender so I would know if I had oil starvation. Can't do it on 3.0 engine. Now fuel starvation is another matter. I've had experience of flooring car off hard corner not stumbling but having a lag in acceleration. Can't tell whether it was throttle being pulled back by DSC or DTC or by fuel starvation.

[Vetracr]

Still confused. How do you shut off both DSC AND DTC? If I read the explanations you can't turn off the DTC. I want to drive car myself. I don't want the BMW nanny to help me.

[Tangent]

To shut off DTC either press the DSC button to the left of the shifter, or if equipped change to Sport+ mode. To shut off DSC entirely, press and hold the DSC button for about 5 seconds until the display in the instrument cluster pops up telling you it's off. This is all in the manual.

Either way, save this for the track. BMW drivers already have a douchebag image to fight and driving on public roads in a way that has DTC or DSC intervening doesn't help.

[Zyal8r]

http://weblog.pac1.net/_Documents/14...escription.pdf

The chart for DSC is on page 77. I think it answers a lot off questions but again the translation might be confusing