My friend has a 335xi and he is able to turn off his all wheel drive. I was wondering if we could do the same?

 

How do you turn off 4 wheel drive? I think your friend is smoking something.

 

It makes sense. I mean why wouldn't they be able to just deactivate the AWD system and use it as a regular RWD? Are you 100% certain the BMW can do this?

 

the dealership guy told him to turn off the DTC and it will be disabling the AWD to RWD but i guess there could be some controversy to this.

 

If the dealrer told him to turn DTC off , he is utter stupid and does not deserve to be a BMW dealer.

when you press DTC , its turns DTC ON not off.



With DSC on ( Default ) , the car modulates the throttle to kill 99.9% of any wheel spin.

With DTC on, the car will allow most forward wheel spin, but if it detects side to side movement, it will cut power.

Dynamic Stability Control (DSC).

Dynamic Stability Control (DSC) adds to safety by facilitating vehicle control even in adverse driving conditions or on tough surfaces.

Dynamic Stability Control (DSC) is the nucleus of the chassis control systems in BMW vehicles. It ensures the highest possible levels of stability when driving, and it maximizes traction of all wheels when setting off or accelerating. It is able to detect the first signs of oversteering or understeering and helps keep the vehicle safely on course, even if the tyres have varying levels of grip.

Sophisticated sensors permanently check how the vehicle is driving. Information comes a range of sensors monitoring wheel rotation, steering angle, lateral forces, pressure and yaw (degree of rotation around the vertical axis). A simulation model stored in the DSC control unit to ensure stability ("one-/two-track model") and can be compared information coming from the steering wheel and accelerator: if there is too great a difference between the model and how the vehicle is currently travelling, DSC acts to increase stability or traction.

The engine and brake management systems are targeted specifically; xDrive is also included in all-wheel drive vehicles. Reducing or increasing the engine torque or braking individual wheels can improve stability and traction. Active Steering’s integrated yaw regulation system can even help significantly reduce steering effort and the extent of DSC’s contribution to stability.

Dynamic Traction Control (DTC).

Dynamic Traction Control (DTC) allows for sports-style driving dynamics even when DSC is controlling stability and when wheel traction is higher.

Dynamic Traction Control (DTC) is a sub-function of the Dynamic Stability Control (DSC) system. DTC has two major uses: to regulate traction and to enable sports-style driving while providing active stability control.

If the front wheels are stuck in snow and cannot spin properly, this leads to slip on the rear wheels (when they spin faster than the front wheels, generally a sign that performance has been exceeded) and DSC acts to change engine output: the power needed for forward movement is reduced. Switching to DTC has a positive effect on this situation, as traction is improved without a loss of power.

When DTC is on, it helps the driver alleviate the situation enough for DSC's measures to become effective. The driver retains complete control over the vehicle.

 

if you hold it down for 3 sec it disables both he said.

 

yes but that does not turn off the AWD feature in the car. You only would want to turn off all the eletronic aid when its snow ( Not ICY surface ) , where the wheel is loosing traction even you slowly accelerate.