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Nitro 4-Tec 3.3
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It is important that your
engine is properly tuned
and has reached full
operating temperature
before making shift point
adjustments. Stop the
engine before making
adjustments.
The transmission may not
shift if the adjustment screw
is turned too far in (locked
in first gear), or too far out
(locked in second gear). If
the car has quick
acceleration and does not
appear to shift, the
transmission is never
reaching the shift point. The
shift point needs to be
lowered by turning the
adjustment screw counter-
clockwise. If the car has
poor acceleration but very
high top speed, the
transmission is shifting into
second gear almost
instantly. The shift point
needs to be raised by
turning the adjustment
screw clockwise.
Adjusting Your Nitro 4-Tec 3.3
Once you become familiar with driving your Nitro 4-Tec 3.3, you may
wish to make adjustments for better driving performance.
Adjusting the Shift Point
The Nitro 4-Tec comes equipped with a two-speed transmission. When
the shift point on this transmission is adjusted correctly, it will
maximize acceleration, improve drivability, and minimize lap times. Use
a 2.0mm hex wrench to adjust the shift point.
1. Stop engine.
2. Rotate the drum until the access hole is visible from the top.
3. Hold the spur gear set, and roll
the car forward while looking
through the access hole. Note
that you will see two set screws
through the access hole as you
roll the car forward. The first one
holds the two-speed mechanism
to the shaft. Do not loosen this
screw unless you want to
remove the two-speed
mechanism. The second is the
adjustment set screw. Refer to the drawing to identify the screws.
4. Insert a 2.0 hex wrench through the clutch drum and into
the adjustment set screw. (See diagram)
5. Turn the adjustment screw clockwise
to raise the shift point (later shifts).
Be careful not to overtighten the
adjustment screw or you may
damage the tension spring.
6. Turn the adjustment screw counter-
clockwise to lower shift point (earlier
shifts). Be careful not to loosen the
adjustment screw too much or you
may cause the screw and spring to
fall out.
7. Use 1/8 turn increments to find the approximate, desired shift point.
8. Check performance by running a test lap after each adjustment.
9. Use 1/8-1/16 turn increments to fine tune the shift point.
Alignment Specs
The Nitro 4-Tec is supplied with soft-compound, race-quality tires. Due
to the high power output of the TRX 3.3 Racing Engine and the high
performance nature of the tires, suspension alignment is critical to
achieving maximum tire life. Proper alignment promotes even and
consistent tire wear as well as predictable and balanced handling.
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 degrees of camber (wheel is
perpendicular to the ground). In the rear,
adjust the wheels to 1 to 2 degrees of
negative camber. These adjustments
should be set with the car positioned at its
normal ride height. The following
information gives recommended stock
alignment settings for the Nitro 4-Tec with
stock tires and inserts.
Front Camber Degrees -1.0
Rear Camber Degrees -1.0
Front Caster Degrees* 12.0
Front Toe-In Degrees 0.0
* This setting is achieved by having the
1mm caster spacer in the front and the
2mm caster spacer in the rear (where
the upper suspension arm attaches to
the upper suspension arm mount).
Access
Hole
Drum
0°
-1°
-2°
TO
0°
0°
0°
-1°
-2°
TO
0°
0°
Front
Camber
Rear
Camber