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PERSONAL SAFETY PRECAUTIONS
Please follow the precautions at all times. Operate your
Nitro 4-Tec Pro sensibly and with care and it will be
exciting, safe, and fun for you and your spectators.
Failure to operate your Nitro 4-Tec Pro in a safe and
responsible manner could result in property damage and
serious injury. You alone must see to it that the instruc-
tions are followed and the precautions are adhered to.
The Nitro 4-Tec Pro is not intended for use by children
without the supervision of a responsible adult. Every
precaution outlined in this manual should be followed to
help ensure safe operation. Traxxas Corporation shall not
be liable for any loss or damages, whether direct, indirect,
special, incidental, or consequential, arising from the use,
misuse, or abuse of this product and any chemical or
accessory required to operate this product.
• The fuel is dangerous and poisonous. Follow all of the
direction and precautions on the fuel container.
• The fuel can look like a cool drink to a young child.
Keep it out of children's reach.
• The fuel is flammable. Do not allow sparks, flame, or
smoking in the presence of model fuel.
• The engine emits poisonous carbon monoxide gas just
like a real automobile engine. Always run the model in a
well-ventilated area. Never attempt to run the engine
indoors unless there is adequate ventilation.
• The engine and exhaust system become extremely
hot during use. Be careful not to touch these parts, espe
cially when refueling.
• Do not drive the Nitro 4-Tec Pro at night.
• Never, under any circumstances, operate the Nitro 4-Tec
Pro in crowds of people. The model is very fast and
could cause injury if allowed to collide with anyone.
• Because the Nitro 4-Tec Pro is controlled by radio, it
is subject to radio interference from many sources that
are beyond your control. Since radio interference can
cause momentary losses of radio control, always allow
a safety margin in all directions around the car in order
to prevent collisions.
• The engine can be very loud.If the noise makes
you uncomfortable, wear ear protection. Be considerate
of your neighbors by not running your model early
in the morning or late in the evening.
• Most importantly, use good, common sense at all times.
GEAR RATIOS
Another Nitro 4-Tec Pro feature is the ability to change
the gear ratios. Currently, there are three optional gear
ratios for the Nitro 4-Tec Pro. The stock gear ratio will
provide the best acceleration. A higher (lower numerical)
gear ratio provides extreme top speed primarily intend-
ed for flat-out running on large, unobstructed, paved
areas. Organized, 1/10 scale, nitro touring car racing is
typically done on smaller, closed courses. For this type of
racing use a lower (higher numerical) gear ratio such as
the stock gear ratio. The following chart gives the four pos-
sible gear ratios sets. The ratios are arranged from highest
(lowest numerical) to lowest (highest numerical). A brief
application recommendation follows each gear ratio set.
4
NOTE: Nitro 4-Tec Pro gear ratios must be changed
as 1st and 2nd gear sets in order to maintain com-
patible gear center distances. The gear ratio chart
gives the only four compatible ratio choices.
GEAR
OPTIONAL CLUTCH GEARS
1st ........16 ........41 ........2.5 ............5.81 ...........37.3
w/OPTIONAL SPUR GEARS
2nd ........20 ........37 ........1.85 .........4.19 ...........51.6
Ratio Characteristics:
Moderate acceleration, highest top speed
Recommended Application:
Sport/recreational running in very large areas
STOCK CLUTCH GEARS
1st ........15 ........41 ........2.73 .........6.20 ..........34.9
w/OPTIONAL SPUR GEARS
2nd ........19 ........37 ........1.95 .........4.41 ..........49.0
Ratio Characteristics:
Good acceleration, very high top speed
Recommended Application:
Sport/recreation running in very large areas
OPTIONAL CLUTCH GEARS
1st..........16 ........45 ........2.81 .........6.38 ..........34.0
w/STOCK SPUR GEARS
2nd ........20 ........41 ........2.05 .........4.65 ..........46.6
Ratio Characteristics:
Very good acceleration, high top speed
Recommended Application:
Sport/recreation, racing on large 1/8 scale size tracks
NITRO 4-Tec PRO STOCK
1st..........15 ........45 ........3.00 .........6.80 .........31.8
EQUIPMENT
2nd ........19 ........41 ........2.16 .........4.89 .........44.3
Ratio Characteristics:
Explosive acceleration, moderate top speed
Recommended Application:
Racing on small, tight tracks.
Recreational running in small areas.
BELT TENSION ADJUSTMENTS
The rear belt tension is adjustable via belt tension cams in
the right and left rear side plates. The rear belt in the Nitro
4-Tec Pro transmits most of the engine's power. Because
of the high loading of the rear belt, the tension should be
checked every 3-4 hours (20-25 tanks of fuel) of running.
If the rear belt can be deflected more than 0.25¨ (6mm)
(see drawing), the belt tension cams should be rotated
rearward to the next eccentric slot.
Increasing
rear belt
Left side frame
Rear of car
The Nitro 4-Tec's front and middle drive belts are
designed to have a high initial tension. During the break-
in period, the drive belts and pulleys will "wear in" and
the belt tension will gradually decrease. The front and
middle belt tensions can be tightened by inserting
3x6x.5 flat metal washers under the front bearing block
spacers. Do not tighten the front belt tension unless
there is more than 0.25 inch (6mm) deflection at the
center of the belt (see drawing).
CLUTCH SPUR
PRIMARY
OVERALL
TEETH TEETH REDUCTION REDUCTION (EST. MPH)
tension
Right side frame
Rear of car
.25¨ (6mm)
SPEED
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