Possible to keep DTC on with DSC off?

[Newbers]

http://www.bmw.com/com/en/insights/technology/technology_guide/articles/dynamic_traction_control.html

and here more about BMW's understanding of the two modes (especially page 17)
http://www.bmwclub.lv/files/06_E85_Chassis_Dynamics.001.pdf

Good find!

This is a concern tho.:

Brake Force Display
To improve the reaction of other drivers in a panic stop,
the E85 has a Brake Force Display system. If a deceleration
of more than 5m/s2 or an ABS signal is detected,
the bulbs in compartment 3 are activated by the
light switch center. They will then receive the full 21
Watts of power and the brake light plus Brake Force
Display function is illuminated.

Does this mine when I'm coming of a roundabout sideways the person behind thinks I'm braking because the brake lits are on?

 

[corsaire77]

http://www.bmw.com/com/en/insights/technology/technology_guide/articles/dynamic_traction_control.html

and here more about BMW's understanding of the two modes (especially page 17)
http://www.bmwclub.lv/files/06_E85_Chassis_Dynamics.001.pdf

Good find!

This is a concern tho.:

Brake Force Display
To improve the reaction of other drivers in a panic stop,
the E85 has a Brake Force Display system. If a deceleration
of more than 5m/s2 or an ABS signal is detected,
the bulbs in compartment 3 are activated by the
light switch center. They will then receive the full 21
Watts of power and the brake light plus Brake Force
Display function is illuminated.

Does this mine when I'm coming of a roundabout sideways the person behind thinks I'm braking because the brake lits are on?

Anyway, the Brake Force Display is an optional feature and not all of our Zeds have it.

 

[ChawenHalo]

Ah right, yes of course it wouldn't work due to the TC. It's a shame they didn't offer a LSD option on the Z4 but I suppose they had to differentiate between the Z4 and the Z4M.

I have often said it surprises me that bmw don't offer a LSD across the range of their more sporting/larger engine cars because as you say most people would enjoy a LSD alot, but it must be as you have pointed out that they want to separate the M cars from the rest of the range, which I think is a shame.

is an LSD unseful on road?

you can get a Quiafe LSD fitted easily enough altough I'm not sure if it means adjusting the boot floor...

 

[LeeZ4MR]

Ah right, yes of course it wouldn't work due to the TC. It's a shame they didn't offer a LSD option on the Z4 but I suppose they had to differentiate between the Z4 and the Z4M.

I have often said it surprises me that bmw don't offer a LSD across the range of their more sporting/larger engine cars because as you say most people would enjoy a LSD alot, but it must be as you have pointed out that they want to separate the M cars from the rest of the range, which I think is a shame.

is an LSD unseful on road?

you can get a Quiafe LSD fitted easily enough altough I'm not sure if it means adjusting the boot floor...

I think a LSD is useful it gives you reasonable grip when you need it & locks a wheel if you want to slide it & being in control of the rears wheels myself rather than an electronic safety net I just prefer, we went through more rears pads on the old 330d than fronts as the traction control was always cutting the power back.

 

[bcworkz]

Minor point: LSDs do not fully lock the two sides together. LS is for limited slip, not locking. Locked axles on a dry road would give very bizarre, unwanted behaviour. Ask anyone with a 4x4 who forgot to unlock their selective locking diff. LSDs have a sort of clutch pack that transmits driving force to the non-spinning wheel. No matter what, the clutch pack will slip some, thus the limited slip moniker. It never fully locks, that is something you only want on off-road vehicles.

BTW, these devices are FAR superior to the heap cass computer applying brake DTC gimmick, IMO.

 

[McKoval]

LSDs have a sort of clutch pack that transmits driving force to the non-spinning wheel.

You are correct, sir, but only with clutch type lsd's, and there's quite a lot of lsd types
Quaife is a gear type lsd, otherwise called torsen als (from TORque-SENsitive) and it works quite differently with more gentle characteristics
the clutch type (invented by ZF, which was founded by Porsche to invent lsd.. ) works a bit more aggresively
Theres also viscous type lsd (it was used as oe in fiat coupe turbo's and early mx5's) whisch is a whole different story

To make a long story shirt, for daily driving you want gear type LSD, so quaife is the best choice.
If you would be doing a group buy of quaife's I'd love to join you :driving:
Just got back from a lil bit of stree-/snow hooliganing, and I find driving on snow almost impossible with all systems off - every time you step on it, one wheel spins and you cant slide the car smoothly - DTC mode is a little bit better, but it tries to regain grip and spoils the fun. DSTC in completely useless fun-wise.

Few words about lsd's for those interested:
http://en.wikipedia.org/wiki/Limited-slip_differential