BMW LCI 3 2015 Series Operating Manual page 13

3￿Series LCI
3.￿Powertrain
The￿information￿from￿the￿neutral￿sensor￿is￿also￿used￿for￿the￿MSA￿function￿as￿well￿as￿the￿shift￿point
indicator,￿and￿engine￿speed￿adaptation￿during￿a￿gear￿change.
The￿corresponding￿engine￿speed￿is￿calculated￿by￿the￿DME￿and￿held￿for￿a￿maximum￿of￿2￿seconds.
The￿engine￿speed￿is￿adapted￿in￿varying￿degrees￿depending￿on￿the￿driving￿mode￿selected.
For￿the￿control￿the￿clutch￿pedal￿must￿be￿fully￿pressed￿when￿shifting.
The￿engine￿speed￿adaptation￿for￿the￿gear￿change￿is￿not￿active:
• When￿the￿DCS￿is￿switched￿off
• At￿driving￿speeds￿<￿12￿mph
• When￿switching￿to￿1st￿gear
The￿engine￿speed￿adaptation￿can￿be￿permanently￿deactivated￿by￿the￿diagnosis￿system.
After￿replacement￿of￿the￿sensor￿it￿must￿be￿calibrated￿with￿the￿BMW￿diagnosis￿system.
3.3.￿Automatic￿transmission
The￿new￿GA8HP50Z￿automatic￿transmission￿is￿used￿in￿the￿BMW 3￿Series LCI￿with￿the￿new￿engine
generation￿(B58).￿This￿is￿a￿further￿development￿of￿the￿already￿established￿automatic￿transmission
GA8HP45Z￿used￿with￿the￿N20￿and￿N26￿engines..
It￿is￿characterized￿above￿all￿by￿improved￿efficiency￿as￿well￿as￿enhanced￿driving￿and￿shifting￿comfort.
These￿improvements￿have￿been￿achieved￿by￿the￿following￿measures,￿to￿name￿a￿few:
• Greater￿spread￿thanks￿to￿two￿changed￿gear￿sets
• Mechanical￿disc￿separation￿by￿undulated￿expander￿springs￿in￿brakes￿A￿and￿B￿in￿the￿not
actuated￿state
• Additional￿spring￿assembly￿for￿the￿opening￿of￿brake￿B.
8