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Adjusting Your Nitro 4-Tec
Once you become familiar with driving your Nitro 4-Tec, you may
It is important that
your engine is
wish to make adjustments for better driving performance.
properly tuned and
has reached full operating
Adjusting the Shift Point
temperature before making
The Nitro 4-Tec comes equipped with a two-speed transmission.
shift point adjustments. Stop
When the shift point on this transmission is adjusted correctly, it
the engine before making
will maximize acceleration, improve drivability, and minimize lap
adjustments.
times. Use a 2.0mm allen wrench to adjust the shift point.
1. Stop engine.
2. Rotate the drum until the access hole is visible from the top.
The transmission
3. Hold the spur gear set, and roll the car forward while looking
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
4. Insert a 2.0 allen wrench through the clutch drum and into
acceleration but very high
top speed, the transmission
is shifting into second gear
5. Turn the adjustment screw clockwise to raise the shift point
almost instantly. The shift
point needs to be raised by
turning the adjustment
screw clockwise.
6. Turn the adjustment screw
38
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.
the adjustment set screw. (See diagram)
(later shifts). Be careful not to
overtighten the adjustment
screw or you may damage the
tension spring.
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 2.5 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.
Access
Hole
Camber
Drum
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).
Front
Camber
0°
Rear
Camber
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