24 • TRAXXAS RALLY
ADVANCED TUNING ADJUSTMENTS
When using higher gear ratios, it is important to monitor
the temperatures of the battery and motor. If the battery
is extremely hot (150°F), and/or the motor is too hot
to touch (200°F), your model is probably over-geared
and drawing too much current. This temperature test
assumes that your model is close to factory stock weight
and operates freely with no excessive friction, dragging,
or binding, and the battery is fully charged and in good
condition.
Note
: Check and adjust gear mesh if a spur
and/or pinion gear is changed.
This model is equipped with a Velineon 3500 motor. The gear
combination that comes stock on each model provides good overall
acceleration and top speed. If you want more top speed install the
included optional large pinion gear (more teeth).
The included
optional large pinion gear is intended for high-speed running on
hard surfaces, and this gearing is not recommended for off-road or
repetitive starting and stopping.
LIPO BATTERIES
LiPo batteries are intended only for the most advanced users that are
educated on the risks associated with LiPo battery use. It is critical to
follow all instructions supplied by the battery manufacturer and the
charger manufacturer for proper charging, use, and storage of LiPo
batteries. Make sure you understand how to use your LiPo batteries.
See Safety Precautions and warnings on page 4 for more information.
ADVANCED VXL-3s ESC SETUP
The VXL-3s electronic speed control is capable of controlling brushed,
brushless, and sensored brushless motors. The VXL-3s auto-detects
the motor type and has numerous built-in safeguards to prevent
damage from mis-wiring or damaged wiring.
Sensorless Brushless Motors
Sensorless motors are the easiest and most reliable brushless motor
type. The VXL-3s is optimized to deliver the smoothest possible
sensorless motor performance. The Velineon 3500 is a sensorless
brushless motor (see sidebar for specs). The wiring (phase alignment)
of the motor determines its direction of rotation. Refer to the wiring
diagram on page 10.
Sensored Brushless Motors
The VXL-3s is fully compatible with sensored brushless motors.
Sensor motors use an additional sensor installed in the motor to
communicate rotor position to the speed control. The VXL-3s features
a covered auxiliary port that accepts aftermarket motor sensors on
the front face of the unit.
The VXL-3s has built-in Sensor Motor Backup
Protection to prevent damage if the sensor
leads or phase leads become disconnected.
If a sensor lead becomes damaged or is
disconnected, the VXL-3s automatically
switches to sensorless brushless operation.
The VXL-3s also features Sensor Phase Detection. When a sensored
brushless motor is connected, the VXL-3s will check for proper wiring.
If the motor phase wiring is incorrect, the VXL-3s will not apply power
to the motor until it is wired correctly.
Optional sensored brushless motor wiring diagram
:
Velineon 3500 Specs
Type:
Sensorless brushless
RPM/volt:
3500 (10-turn)
Magnet type:
Ultra High-Temperature
Sintered Neodymium
Connection type :
3.5mm bullet
Wire size:
12 Gauge
Current Ratings:
200A constant
320A peak/burst
Max RPM:
50,000
Diameter:
36mm (1.42) (540 size)
Length:
55mm (2.165)
Weight:
262g (9.24oz)
The VXL-3s features Locked
Rotor Protection. The VXL-3s
checks to make sure the
motor is turning. If the motor
is locked or damaged, the
ESC will enter fail-safe until
the motor is free to rotate.
Always use the proper length
motor bolts. The standard
motor mounting bolts
are 3x8mm. Using motor
bolts that are too long can
interfere with the motor’s
rotation and damage the
motor’s internals!
7407 Rally
30+mph
35+mph
40+mph
40+mph
45+mph
60+mph
Pinion/Spur
13/54*
13/54*
19
/54**
19
/54**
13/54*
19
/54**
Battery
7-Cell NiMH
7-Cell NiMH
7-Cell NiMH
2S LiPo
3S LiPo
3S LiPo
Nominal Voltage
8.4V
8.4V
8.4V
7.4V
11.1V
11.1V
mAh
3000 mAh
5000+ mAh
3000 mAh
4000+ mAh
5000+ mAh
5000+ mAh
Skill Level
1
1
2
4
5
5
*Stock Gearing
** Included optional gear
