STAMPEDE 4X4 • 21
thinner viscosity oils (30W or less) flow more smoothly and are more
consistent, while thicker oils provide more damping. Use only 100%
pure silicone shock oil to prolong seal life. From the factory, shock
oil is set to 30W in the front and rear shocks.
The model’s ride height can be adjusted by adding or removing the
clip-on, spring preload spacers. Adjust the ride height so that the
suspension arms are slightly above being parallel to the ground.
Observe how the model handles in turns. Proper setup will add stability
and help prevent spin outs. Experiment with different springs and
shock oils to find what works best for your current track conditions.
Centering Your Servo
If the trim controls on your transmitter seem off, you may need to
re-center your servo. Additionally, whenever your servo has been
removed for service or cleaning, it must be re-centered prior to
installation in the model.
1. Disconnect the servo horn from the steering servo.
2. Connect the steering servo to channel 1 on the receiver. Connect
the electronic speed control (ESC) to channel 2.
3. Place fresh “AA” batteries in the transmitter and turn the
transmitter power switch on.
4. Turn the steering trim adjustment on the transmitter to the center
“0” position.
5. Elevate the rear wheels of the model. Connect a fresh 7.2V battery
pack to the speed control and turn on the ESC (see page 11). The
servo will automatically jump to its center position.
6. Turn off the power to the model followed by the transmitter. The
servo horn is now ready to be installed.
7. Be careful not to move the servo shaft when installing the servo
horn. Readjust the ESC as described in the “Adjusting the Speed
Control” section.
Motors and Gearing
There are two different types of motors that can be purchased
for your model, brushed and brushless. Brushed motors are the
standard and offer good power inexpensively. They use metallic
brushes to send electrical power to the commutator inside the
motor. A brushless motor eliminates the brush-to-commutator
contact points, along with its heat and wear. Because of this,
brushless motors offer more speed, and are more efficient and
do not require the same amount of maintenance, but are more
expensive and require a special electronic speed control (ESC).
When going brushless, differential gears, parts #5379 and #6879,
can be used for maximum durability.
One of the more significant advantages to your model’s
transmission is the extremely wide range of available gear ratios. It
can be geared low enough to run extremely hot, modified motors.
Modified motors should be geared lower (higher numerically) than
stock motors because they reach their maximum power at higher
RPM’s. A modified motor that is geared incorrectly can actually
be slower than a correctly-geared, stock motor. Use the following
formula to calculate the overall ratio for combinations not listed on
the gear chart:
If you are worried that you might be over-geared, check the
temperature of the battery pack and motor. If the battery is extremely
hot, and/or the motor is too hot to touch, your model is probably
over-geared. If you are not able to run your model for at least four
minutes before the battery dies, then change to a lower gear ratio.
This temperature test assumes that the 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.
The model is equipped with a Titan 12T motor. The gear
combination that comes stock on each model provides good overall
acceleration and top speed. If you want more top speed and less
acceleration, install the optional high-speed gearing (more teeth;
sold separately). The optional high-speed gearing is intended for
high-speed running on hard surfaces, and is not recommended for
off-road or repetitive starting and stopping.
The Titan 12T is equipped with an integrated cooling fan that is
effective during medium to high-speed operation. The gearbox is
specially vented to cool the motor. Repetitive starting and stopping
over short distances creates excess heat and will not allow the fan
to cool the motor properly. For this type of driving, smaller pinion
gears are recommended to reduce load on the motor.
ADJUSTING YOUR MODEL
# Spur Gear Teeth
x 3.92 = Final Gear Ratio
# Pinion Gear Teeth
Gearing Compatibility Chart:
The chart below shows
recommended gear combination
ranges for your model.
Spur Gear
Pinion Gear
50
52
54
9
21.76
22.63
23.50
10
19.58
20.37
21.15
11
17.80
18.52
19.23
12
16.32
16.97
17.63
13
15.06
15.67
16.27
14
13.99
14.55
15.11
15
13.06
13.58
14.10
16
12.24
12.73
13.22
17
11.52
11.98
12.44
18
10.88
11.31
11.75
19
10.31
10.72
11.13
20
9.79
10.18
10.58
21
9.33
9.70
10.07
22
8.90
9.26
9.61
23
8.51
8.86
9.20
24
8.16
8.49
8.81
25
7.83
8.15
8.46
Out of Box Setup, recommended for most
running, 6 or 7 cell NiMH, 2S LiPo
30+ mph gearing (Sold Separately),
for high-speed running only
Fits, for high-speed runs only
Not recommended
Does not fit
