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Nitro 4-Tec 3.3
High Altitude Operation:
If you live in a high
altitude region (5000 or
more feet above sea level),
the lower air density may
require you to lean your
high-speed fuel mixture
slightly from the factory
break in settings. Try this
if you are experiencing
difficult starting or
extremely sluggish
engine performance at
high altitude.
As you gain experience in
the hobby, you may
discover that many people
have differing opinions on
what is the proper
procedure to break-in a
model engine.
Only use the
Traxxas break-in procedure.
Other break-in procedures
could result in a weak,
damaged, or otherwise poor
performing engine.
The
procedure outlined here
was extensively tested and
proven to yield better
performing engines than
other “common” break-in
methods. Even if you have
years of experience using
model engines, please do
not ignore this caution!
Tank
1
2
3
4
5
Throttle
1/4
1/2
1/2
Full
Full
Time
2 Seconds
2 Seconds
3 Seconds
3 Seconds
5 Seconds
Cool
15 Minutes
15 Minutes
-
-
-
Body
Off
On
On
On
On
Notes
Apply throttle gradually.
Apply throttle gradually.
Reduce idle speed if necessary.
Do not allow shifting to high gear.
Accelerate over 3 second count, hold for 2 seconds.
Tank 1
1.
Drive the model with the body off.
2.
Driving procedure: Gently pull the throttle trigger to 1/4 throttle over
a 2-second count. Then gently apply the brake to stop
. Count the two
seconds out while accelerating: one thousand one, one thousand two,
and then stop. Operate the throttle trigger as smoothly as you can.
Repeat this starting and stopping procedure until the first tank of
fuel is nearly empty.
3.
Look for thick blue smoke exiting the exhaust outlet. If there is
no smoke, richen the high-speed needle 1/4 turn, by turning the needle
counterclockwise.
4. When the fuel tank is nearly empty, shut off the engine by pinching the
fuel line connected to the carburetor (use the installed clamp).
5. Let the engine cool for 15 minutes.
Note: If at any point the engine cuts out or stalls during gentle
acceleration, richen the high-speed needle 1/4 turn by turning the needle
counterclockwise.
Tank 2
1.
From tank 2 forward, Nitro 4-Tec should be driven with the body on.
2.
Driving procedure: Gently pull the throttle trigger to 1/2 throttle over
a 2-second count. Then gently apply the brake to stop.
Count the two
seconds out while accelerating: one thousand one, one thousand two,
and then stop.
Repeat this starting and stopping procedure until the
second tank of fuel is nearly empty.
3.
When the fuel tank is nearly empty, shut off the engine and let it cool
for 15 minutes.
Tank 3
1.
Driving procedure: Gently pull the throttle trigger to 1/2 throttle over
a 3-second count. Then gently apply the brake to stop.
Count the
three seconds out while accelerating: one thousand one, one thousand
two, one thousand three, and then stop.
Repeat this starting and
stopping procedure until the third tank of fuel is nearly empty.
2.
As the engine loosens, the idle speed may increase and cause
the model to try to creep forward when stopped. Reduce the
idle speed by turning the idle adjustment (see page 18) on the
carburetor counterclockwise.
3. When the fuel tank is nearly empty, shut off the engine and refuel.
From here on, you do not need to let the engine cool between tanks.
Tank 4
1.
Driving procedure: Gently pull the throttle trigger to full throttle over
a 3-second count. Then gently apply the brake to stop.
Count the
three seconds out while accelerating: one thousand one, one thousand
two, one thousand three, and then stop.
Repeat this starting and
stopping procedure until the fourth tank of fuel is nearly empty.
2.
Apply the throttle gradually! Your finger should not reach full throttle
until the end of the three-second count. Nitro 4-Tec may try to shift into
second gear. If it does, reduce the throttle input. Do not let Nitro 4-Tec
shift out of first gear.
3. Keep your driving smooth and consistent.
4. When the fuel tank is nearly empty, shut off the engine and refuel.
Tank 5
1.
Driving procedure: Gently pull the throttle trigger to full throttle over
a 3-second count, hold for 2 more seconds, and then gently apply
the brake to stop.
Count the five seconds out while accelerating.
Repeat this starting and stopping procedure until the fifth tank of
fuel is nearly empty.
2.
The model should now be shifting into second gear. If it is not, try
turning the high-speed needle clockwise 1/8 turn to lean the fuel
mixture slightly and test for shifting.
3. When the fuel tank is nearly empty, shut off the engine and refuel.
Tank 6
STOP! Clean your air filter before you proceed. Refer to the instructions
on page 22. During the sixth tank of fuel, the engine can be tuned
for general performance use. Proceed to the next section in this manual.
The TRX 3.3 Racing Engine