Detroit Diesel DDEC VI Application And Installation page 337

DDEC VI ELECTRONIC CONTROLS APPLICATION AND INSTALLATION
5.22.4 HIGH RANGE
Two high range parameters should be selected; a high range maximum vehicle speed (MPH) and
a high range maximum engine speed (RPM). The default values shown in the first illustration
(see see Figure 5-27) are 50 MPH (approximately 80.5 km/h) and 1650 RPM, respectively. Once
the high range maximum engine speed is attained, the engine will not be allowed to operate
above the high range maximum engine speed. This is meant to encourage up-shifting to high
gear in order to increase vehicle speed (see see Figure 5-28). Spec Manager should be used if
the HIGH GEAR MPH is set such that it reduces the vehicle speed and the engine MPH; this
limit will not work as desired.
NOTE:
The HIGH GEAR maximum engine speed could change the maximum Vehicle Limit
Speed if the high gear maximum engine speed (RPM) limits the Vehicle Limit Speed.
With Progressive Shift enabled, the high gear RPM limit overrides the rated speed of
the engine rating.
5-125
All information subject to change without notice. (Rev. 01/07)
7SA827 0701 Copyright © 2007 DETROIT DIESEL CORPORATION