Traxxas 49077 - Manual (Page 25)

T-MAXX 3.3 OWNER’S MANUAL • 25
TUNING ADJUSTMENTS
truck easier and more forgiving to drive by helping to reduce the amount
of wheel spin. Loosening the slipper adjustment can also improve
performance on extreme high traction surfaces by preventing the front
end from lifting off of the ground when accelerating. Make slipper
adjustments in small 1/8 turn increments.
The maximum tight setting for the slipper is just at the point where
there is little or no tire slippage on a high traction surface such as
concrete or a prepared racetrack. The slipper should not be tightened
to the point that clutch slippage is completely eliminated. Do not
overtighten the slipper nut or you could damage the slipper bearings,
pressure plates, or other components.
Adjusting the Two-Speed Transmission
T-Maxx 3.3 comes equipped with an adjustable two-speed transmission.
When the shift point on the transmission is adjusted correctly, it will
maximize acceleration and improve drivability. Use a 2mm hex wrench
to adjust the shift point. To make the adjustment, the engine must be off
(not running).
1. Remove the rubber access plug from the
top of the transmission housing.
2. While looking through the opening, rotate
the spur gear to align the cutout (notch)
on the internal 2-speed clutch drum with
the opening.
3. Hold the spur gear and slowly roll the
truck forward until the hex on the black
adjustment set screw becomes visible in
the opening. Note: the truck will only roll
forward (not backwards) when the spur
gear is held stationary.
4. Insert the 2.0mm hex wrench
through the clutch drum and into
the adjustment screw.
5. Turn the adjustment screw 1/8 turn
counter clockwise to lower the shift point
(shifts sooner). Be careful not to loosen
the adjustment screw too much or you
may cause the screw and spring to fall out
(requiring major disassembly and repair).
Turn the adjustment screw clockwise for
later shifts.
6. Reinstall the rubber access plug to prevent dirt from entering the
transmission. Do not put oil or other lubricants into the transmission
through the two-speed adjustment access.
7. Check performance by running a test lap after each adjustment. On a
small race track with many tight turns, try setting the shift point later
so that the truck only shifts into second gear on the main straightaway.
This will prevent an unexpected shift in the middle of a turn. On larger
tracks it may be necessary to allow earlier shifts for increased speed.
Changing the Spur Gear
1. Remove the four cap head screws that secure
the engine to the engine mount.
2. Remove the button head screw that secures the
pipe hanger to the rear body mount.
3. Carefully remove the engine and exhaust system
from the spur gear area to allow enough room
to remove the spur gear.
4. Remove the three screws on the slipper clutch assembly using a 2.5mm
hex wrench. Slide the spur gear off of the slipper shaft. If the spur gear
is too tight on the shaft, gently pry on the back of the gear with a flat
screw driver to loosen it.
Repeat the above steps in reverse order to install the new spur gear
Adjusting the Gear Ratio
The gear ratio on T-Maxx 3.3 can be adjusted for different conditions
that may require either increased acceleration or increased top speed.
Adjusting the gear ratio is accomplished by changing the clutch bell on
the engine and/or the spur gear (slipper clutch gear) on the transmission.
From the factory, T-Maxx 3.3 is equipped with a 22-tooth clutch bell
and a 55-tooth spur gear. This combination will provide a good balance
of acceleration and top speed. Optional spur gears and clutch bell
gears are listed on your parts list. Refer to the chart below for possible
gearing combinations.
Adjusting the Spur Gear/Clutch Bell Gear Mesh
The ideal spur gear/clutch bell gear mesh
for T-Maxx 3.3 is 0.1mm. To set the gear
mesh, place a strip of standard letter/A4
size copy or printer paper (about 0.1mm
thick) between the mating teeth. Loosen the
four engine mount screws from the bottom
side of the chassis (see image) and slide the
engine mount up to push the clutch bell gear
against the spur gear so the paper is not too
tight to pull out or too loose that it will fall out.
Tighten the engine mount screws securely.
When the paper is removed, you should feel
only the slightest amount of play between the
gears (almost none) and there should be no
binding or friction.
Adjusting the Two-Speed Ratios
T-Maxx 3.3 is equipped to allow adjustment to the 2-speed by installing
optional close and wide-ratio gearsets. This requires transmission removal
and disassembly (see www.Traxxas.com for detailed instructions). The close
ratio gearsets will reduce top speed slightly but will provide more powerful
Shift
Sooner
Counter-
Clockwise
*stock configuration out of the box
With 20T Clutch Bell # of Spur Gear Teeth
2nd gear sets Gear 54 56 58
17T/39T 1st 25.42 26.36 27.30
(Standard) 2nd 17.63 18.28 18.94
16T/40T 1st 25.42 26.36 27.30
(Close) 2nd 19.21 19.92 20.63
18T/38T 1st 25.42 26.36 27.30
(Wide) 2nd 16.22 16.82 17.42
With 22T Clutch Bell (standard) # of Spur Gear Teeth
2nd gear sets Gear 54 56 58
17T/39T 1st 23.11 23.96 24.82
(Standard) 2nd 16.03 16.62 17.21
16T/40T 1st 23.11 23.96 24.82
(Close) 2nd 17.47 18.11 18.76
18T/38T 1st 23.11 23.96 24.82*
(Wide) 2nd 14.75 15.29 15.84*
With 24T Clutch Bell # of Spur Gear Teeth
2nd gear sets Gear 54 56 58
17T/39T 1st 21.18 21.97 22.75
(Standard) 2nd 14.69 15.24 15.78
16T/40T 1st 21.18 21.97 22.75
(Close) 2nd 16.01 16.60 17.20
18T/38T 1st 21.18 21.97 22.75
(Wide) 2nd 13.52 14.02 14.52
The gear ratio chart above shows the available combinations
with optional spur gears, clutch bells, and two-speed gear sets.
KC2077-49077-T-Maxx-TQi-Owners.indd 25 6/6/14 11:50 AM