XT Racing GPX Pro, User Manual, Page: 24 / 95

GPX Pro Manual 20
© 2009 XT Racing
100 mph; 0-30-0, 0-60-0, 0-100-0 mph; and a roll-on mode which times and measures from a
programmable start speed to a programmable stop speed (for example, 60-100 mph).
1.3.1 Basic Operation
In Drag Racing mode, you can select from the following types of drag race via the menu item Type
of drag race :
1/8 mile; ¼ mile; 1 mile
0-30 mph; 0-60 mph; 0-100 mph
0-30-0 mph; 0-60-0 mph; 0-100-0 mph
“Roll-on” (e.g., 60-100 mph)
In addition, for each race type (except roll-on), you can select how you will start the session via
the menu item
Drag race starting method : “Standing Start" (timing starts whenever the vehicle
starts moving), or “Tree lights” (you start after a brief cycling of red to yellow to green) and the
reaction time is recorded. There is no “track” for drag racing. You can do it anywhere.
To start a drag race (after you have selected the type
of race and starting method), press Select from the
main menu.
For a few seconds, the GPX will “zero out” the internal accelerometers. Then either you can start
when you’re ready ("Standing start"), or start when the tree lights go green.
NOTE: The internal accelerometers are extremely sensitive.
Especially for drag racing, you must mount the GPX in such a
way as to minimize vibration.
During the 0-30-0, 0-60-0, and 0-100-0 races, the display of the GPX will invert (i.e., reverse black
and white) when you hit the top speed (30, 60, or 100 appropriately). This is the indication that
you have hit the maximum speed and need to start the deceleration (braking) portion of the drag.