Tenspeed Does your car have option #840 ?
BMW's with the M sport option also include
option #840 speed synchronization. That means the limiter is "upped" to 250 kph.
non M-sport models are limited to 210 kph(130 mph).
M sport models are limited to 250 kph(155 mph).
///M models limited to 268 kph(165 mph) Except for X5M/X6M which is set lower, I think(?) to 155 mph).
Also over here in Germany you can pay to go to a ///M driving school. A the end of this school they give you a certificate so your local BMW dealer can raiser your V-Max to 280 kph(real GPS) speed.
Note: the above speeds are GPS and not what the speedo shows. The speedo will always read about 5% or more at V-Max.
Back when my 135i was totally stock this was my V-Max...
BTW... I have option #840. But my true speed via GPS was only 240 kph even though my speedo reported 250 kph!
Since then my car has a German flash tune making 380 PS and 520Nm and an open V-Max. The fastest I have seen has been 283 kph GPS(on my Navi). I know I have gone a few kph faster - but I did not have my GPS to verify this. I have some German friends that say 294 kph(real)GPS is possible in a tuned 135i. I believe them.
Just for reference...
Top Speed in the 1M?
http://www.1addicts.com/forums/showthread.php?t=667205
Dackel