Sport Button - What does it *actually* do?

[mantona]

Picking up on this old thread. The sport button on the Z4M turns traction control off whilst in the standard Z4 it provides a halfway house with some traction control. I don’t do track days so would really like the halfway house option. Can this setting for the sport button be changed - maybe by coding?

[BMWZ4MC]

The sport button doesn't change the traction control or DSC on either model, you're thinking of the DSC button.
M Track Mode gives a three-stage DSC: fully on (traction control and stability control enabled; traction control off, stability control on; everything off). It can be coded on the ///M fairly easily if you have the correct software - search for a thread called M Track Mode and it will tell you how to do it.
On the road I drive mine in the halfway setting most of the time because I find the traction control too intrusive. On the track, everything off is by far the best option.

[mantona]

Perfect - many thanks for your help!