BMW F97 Technical Training Manual page 50

F97/F98￿Complete￿Vehicle
5.￿Chassis￿and￿Suspension
• Direct￿steering￿sensation
• Driving￿condition￿feedback
• M￿dynamic￿driving￿in￿the￿limit￿range
The￿ratio￿of￿M￿Servotronic￿(M￿EPS)￿has￿been￿adapted￿to￿the￿F97/F98;￿of￿particular￿note￿is￿the￿fact￿after
an￿eighth￿of￿a￿turn￿of￿the￿steering￿wheel￿the￿rack￿ratio￿increases￿by￿8%.
F97/F98,￿comparison￿of￿M￿Servotronic￿(M￿EPS)￿steering￿gear￿ratios
Index
1
2
A
B
x
y
The￿system￿supplier￿for￿the￿M￿Servotronic￿(M￿EPS)￿is￿Thyssen￿Krupp.
5.1.2.￿M￿Servotronic
The￿Servotronic￿function￿familiar￿from￿conventional￿hydraulic￿power-steering￿systems￿is￿also￿used￿on
the￿M￿Servotronic￿(M￿EPS)￿and￿is￿available￿as￿standard￿on￿the￿F97/F98.￿It￿is￿a￿M￿Servotronic,￿which
functions￿according￿to￿the￿same￿operating￿principle￿as￿in￿production￿vehicles.￿The￿difference￿in￿the
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Explanation
Rack,￿basic￿version￿G01/G02￿(constant￿gear￿geometry)
Rack,￿variable￿sport￿steering￿F97/F98￿(variable￿gear￿geometry)
More￿indirect￿steering￿gear￿ratio￿(variable￿sport￿steering)
More￿direct￿steering￿gear￿ratio￿(variable￿sport￿steering)
Steering￿wheel￿angle
Rack￿travel