9
the engine performance does not change, then you have exceeded
the maximum safe lean setting.
If tuning for maximum performance results in engine temperature
exceeding 300°F, try to increase airflow to the engine by cutting out
the rear of the body, windshield, and front valance. If the engine
temperature still cannot be kept in check, richen the high-speed
needle slightly.
Adjustments
Toe-in
Geometry and alignment specifications play an important role in
your truck’s handling, so take the time to set them correctly. Set the
steering trim on your transmitter to neutral. Now, adjust your tie rods
so that both wheels are pointing straight ahead and are parallel to
each other (0° toe-in). This will ensure the same amount of steering in
both directions. If you run out of adjustment, then the steering servo
will have to be re-centered (see “Centering your Servos” on page 10).
For increased stability, add 1°- 2° of toe-in to each front wheel. Use
the turnbuckles to adjust the alignment.
Camber
The camber angle of both the front and rear wheels can be adjusted with
the camber rods (upper turnbuckles). Use a square or right-angle triangle
to set the camber accurately. Adjust the front wheels to 0° of camber
(wheel perpendicular to the ground). In the rear, adjust the wheels to
1° to 2° of negative camber. These adjustments should be set with the
truck positioned at its normal ride height.
Shocks
The four shocks on Nitro Stampede have the
most influence on its handling. Whenever
you rebuild your shocks or make any
changes to the pistons, springs, or oil, always
do it carefully and in pairs (front or rear).
Piston selection depends on the range of
oil viscosities that you have available. For
example, using a two-hole piston with a
lightweight oil will, at one point, give you the
same damping as a three-hole piston with
heavier oil. We recommend using the two-
hole pistons with a range of oil viscosities
from 10W to 50W (available from your hobby
shop). The 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.
The ride height for Nitro Stampede can be adjusted by adding or
removing the clip-on spring pre-load spacers. Instead of adding
spacers to increase stiffness, use stiffer springs. Adjust the ride height
so that the suspension arms are slightly above being parallel to the
ground. Observe how the Nitro Stampede handles in turns. If it is
picking up the inside rear wheel in hard turns, then stiffen the front
suspension. If it is picking up the inside front wheel in hard turns,
then stiffen the rear suspension. Proper set-up will add stability and
help prevent roll-overs.
Gear Ratios
A unique Nitro Stampede feature is the ability to change the gear
ratios. The final drive ratio of the gearbox is 2.81 to 1. Use the
following formula to calculate the overall ratio:
Nitro Stampede comes with a 70-tooth spur gear and a 20-tooth
pinion (clutch bell) gear. This combination will provide the best
overall acceleration and top speed. If you want more acceleration and
less top speed, then use a smaller clutch bell gear (fewer teeth). For
more top speed, use a larger clutch bell gear.
adjusting the Slipper Clutch
The Nitro Stampede features an adjustable slipper clutch on the spur
gear to protect the drivetrain from sudden shock loads (such as landing
off of jumps with the engine at full throttle). Under normal conditions,
the slipper clutch should not slip. Before adjusting the slipper clutch,
turn the model off. Do not adjust the slipper clutch while the engine is
running.
Use the supplied wrench to tighten the slipper nut (clockwise) until
it stops, and then back the nut out 1/4 of a turn. If you notice any
decrease in performance after making changes to the slipper clutch
adjustment, then it may be too loose. The slipper must not be allowed
to slip during normal acceleration or the slipper could be damaged.
PRE-lOaD
SPaCERS
Pinion
22
22
22
20
20
18
18
16
16
Spur Gear
66
70
72
70
72
70
72
70
72
Final Drive
8.43:1
8.94:1
9.19:1
9.83:1
10.11:1
10.92:1
11.24:1
12.27:1
12.64:1
aCCElERaTION
TOP SPEED
Number of
Spur
Gear Teeth
Number of
Clutch
Bell Gear Teeth
x 2.81 =
Final Drive Ratio
Changing the Clutch Bell and Spur Gears
Remove the rubber exhaust pipe and
the tuned pipe. Remove the electric
starter drive. Loosen the four 3x8mm
cap-head screws that hold the slotted
adjusting plates to the engine mount.
Remove the large E-clip on the clutch
shaft and the clutch bell gear. Remove
the ball bearings and install them in
the new clutch bell gear. Reinstall the
clutch bell gear and E-clip.
Note
: Smaller clutch bell gears use
smaller ball bearings. Refer to your
parts list for the correct bearings.
Reinstall the spur gear on the top shaft
and secure it with the 4mm locknut.
Remove the 4mm nylon locknut and
the spring from the slipper clutch. Try
to remove the slipper clutch as one
assembly by holding the pressure
plates together with your thumb and
index finger.
Slide a strip of thin note paper
between the spur gear and the clutch
bell gear. Push the clutch bell gear
against the spur gear and tighten
the 3x8mm adjusting plate screws.
Remove the paper; the gear mesh
should be correctly adjusted.
Toe-in
Positive camber
Negative camber
Содержание Nitro Stampede 41094
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