5
SHIFT POINT ADJUSTMENT
The Nitro 4-Tec Pro 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 allen
wrench to adjust the shift point.
NOTE: 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.
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 mecha-
nism 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 allen 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-clock-
wise to lower the 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.
NOTE: The transmission may not shift if the adjust-
ment 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 turn-
ing the adjustment screw clockwise.
TOE IN
The Nitro 4-Tec Pro is supplied with soft-compound,
race-quality tires. Due to the high power output of the
Pro-15 engine and the high performance nature of the
tires, suspension alignment is critical to achieving maxi-
mum tire life. Proper alignment promotes even and con-
sistent tire wear as well as predictable and balanced
handling. Set the steering trim on your transmitter to
neutral. Now, adjust your steering turnbuckles so that
both wheels are pointing straight ahead and are parallel
to each other (0 degrees toe-in). This will ensure the
same amount of steering in both directions.
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 cam-
ber (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).
NEGATIVE CAMBER
POSITIVE CAMBER
