Revo 3.3
•
43
The following gear ratio chart shows the available combinations with
optional spur gears, clutch bells, and two-speed gear sets.
Tuning The Sealed Gear Differentials
Revo’s front and rear gear differentials allow the left and right wheels to
spin at different speeds while turning so that the tires do not scuff or skid.
This decreases the turning radius and increases steering performance.
The performance of the differentials can be tuned for different driving
conditions and performance requirements. The differentials are filled
with silicone differential fluid, and are sealed to maintain consistent
long-term performance. Changing the oil in the differential with either
lower or higher viscosity oil will vary the performance characteristics of
the differentials. Changing to a higher viscosity oil in the differential will
reduce the tendency for engine power to be transferred to the wheel
with the least traction. You may notice this when making sharp turns
on slick surfaces. The unloaded wheels on the inside of the turn have
the least traction and tend to spin up to extremely high rpms. Higher
viscosity (thicker) oil causes the differential to act like a limited-slip
differential, distributing more equal power to the left and right wheels.
Revo will generally benefit from higher viscosity oil when climbing, rock
crawling, or racing on low traction surfaces.
Note:
Heavier oil will allow
power to be transferred even with one or more tires off the ground. This
can make the vehicle more likely to overturn.
From the factory, both the differentials are filled with SAE 30,000W viscosity
silicone oil. Only use silicone oil in the differentials. Traxxas sells SAE 10,000W
and SAE 50,000W viscosity oil (see your parts list). The differentials have to be
removed from the vehicle and disassembled to change/replace oil.
Installing the Long Travel Rockers
Use the exploded views included with the model to aid in the installation
process. All of the rockers have labels identifying their proper location;
RF (right front), LF (left front), RR (right rear), and LR (left rear).
Note:
The
exhaust system must be removed to access the rear rocker arms.
1. Remove shock absorbers
Remove the screws that secure the shocks to the chassis shock mounts,
and to the rocker arms.
2. Install long travel shock springs
Replace all four of the 90mm travel shock springs with the four 120mm
long travel shock springs. The front shock springs are indicated by a
silver dot, and the rear shock springs are indicated by a blue dot.
3. Install long travel rockers
Replace the 90mm travel rockers with the long travel rockers by
removing the four 4x6 buttonhead cap screws from the rocker pivot
posts. Remove the 5x11 ball bearings from the rockers. Install the same
5x11 ball bearings in the long travel rockers. Secure the long travel
rockers to the pivots with the same 4x6 buttonhead cap screws.
4. Remove the blue spacers before installing the push rods
The blue spacers must be removed from all four of the suspension push
rods. Install the push rods into the middle position (marked LT) on the
lower suspension arms.
5. Reinstall shock absorbers
Reinstall all four shock absorbers back into their respective locations.
Use higher viscosity
(thicker) oil for:
• More power to the wheels
with the most traction.
• Racing on low-traction
smooth surfaces .
• Better performance for
climbing on uneven terrain.
Using lower viscosity
(thinner) oil for:
• More power to the wheels
with least traction.
• Racing on low-traction
rough surfaces.
*stock configuration out of the box
With 14T Clutch Bell
# of Spur Gear Teeth
2nd gear sets
Gear
36
38
40
17T/39T
1st
24.21
25.55
26.90
(Standard)
2nd
16.79
17.72
18.66
16T/40T
1st
24.21
25.55
26.90
(Close)
2nd
18.30
19.31
20.33
18T/38T
1st
24.21
25.55*
26.90
(Wide)
2nd
15.45
16.31*
17.17
With 15T Clutch Bell
(standard)
# of Spur Gear Teeth
2nd gear sets
Gear
36
38
40
17T/39T
1st
22.59
23.85
25.10
(Standard)
2nd
15.67
16.54
17.41
16T/40T
1st
22.59
23.85
25.10
(Close)
2nd
17.08
18.03
18.97
18T/38T
1st
22.59
23.85
25.10
(Wide)
2nd
14.42
15.22
16.02
With 16T Clutch Bell
# of Spur Gear Teeth
2nd gear sets
Gear
36
38
40
17T/39T
1st
21.18
22.36
23.54
(Standard)
2nd
14.69
15.51
16.32
16T/40T
1st
21.18
22.36
23.54
(Close)
2nd
16.01
16.90
17.79
18T/38T
1st
21.18
22.36
23.54
(Wide)
2nd
13.52
14.27
15.02
With 17T Clutch Bell
# of Spur Gear Teeth
2nd gear sets
Gear
36
38
40
17T/39T
1st
19.94
21.04
22.15
(Standard)
2nd
13.83
14.60
15.36
16T/40T
1st
19.94
21.04
22.15
(Close)
2nd
15.07
15.90
16.74
18T/38T
1st
19.94
21.04
22.15
(Wide)
2nd
12.72
13.43
14.14
Gear Ratio Chart
ADVANCED TUNING ADjUSTMENTS
If you have questions or need technical assistance, call Traxxas at
1-888-TRAXXAS
(1-888-872-9927) (U.S. residents only)
